Moodle in English: Archived posts, use them to search

Re: New Virtual Programming Lab (VPL) module

by Marc Grober - Friday, July 30, 2010, 3:03 AM

Have you created a new module page at moodle.org for your new module?

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, July 30, 2010, 5:17 AM

Hi Marc,

yes, I have created a module page at moodle.org, but I think that is waiting the moderator approval.
Nevertheless, the module has its own page at http://vpl.dis.ulpgc.es and a demo at http://demovpl.dis.ulpgc.es/moodle
All comments are welcome.

Thanks for your interest.

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Re: New Virtual Programming Lab (VPL) module

by Doug Loomer - Sunday, August 22, 2010, 2:09 PM

We are extremely interested in VPL, and would love to see the Demo, but can't get a connection to it. Is the page down?

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, August 23, 2010, 4:43 PM

Thank you for your interest in VPL.
The server is up and running and shows no symptoms of having network problems. I wonder if you're still having problems accessing the server and if someone else has them (The latter is a request to the forum).

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Re: New Virtual Programming Lab (VPL) module

by Doug Loomer - Monday, August 23, 2010, 6:39 PM

Hi Juan Carlos. I was able to reach the server today and play with the demos a bit. It looks like it could be just the thing for our AP and IB Computer classes. I am swamped at the moment, but want to install it on our test server soon. Thanks for making this available! Oh, a couple of observations. I was able to get the java applet editor to run in Firefox on my Mac, but not in Chrome. Perhaps the fault is with Chrome or my Mac, but I just thought I'd let you know. Also, I think "Editing" or "Editor" or "Edit" would be a better tab title than "Edition" in your English language version of the module. Keep up the excellent work!

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Re: New Virtual Programming Lab (VPL) module

by Ashish Kumar - Thursday, April 4, 2013, 1:06 PM

hello ,

we developed a new applet as per vpl, and we need to integrate it in VPL so please tell me how can we do this

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, April 5, 2013, 7:26 PM

Dear Ashish Kumar,
I suppose that you have developed a new version of the editor/console applet of VPL. If it is the case, then you can learn how integrate it by reading de source code of the current applet. You must implement the same public methods than the org.acodeeditor.gui.Main class. The easyest way to set the new applet is replacing the corresponding jar file.
If you have developed another kind of applet, please, give us more details to understand the problem and help to resolve it.
Best regards.

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Re: New Virtual Programming Lab (VPL) module

by Ashish Kumar - Friday, May 31, 2013, 12:37 PM

Dear Juan Carlos Rodríguez-del-Pino

Greetings......!

Thanks For your response , we make a Applet for J2ee and make the Jail Server and need to integrate this applet with VPL Please share me the process for Integration of the applet in VPL

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Re: New Virtual Programming Lab (VPL) module

by deepa ganu - Wednesday, December 16, 2015, 2:00 PM

Hi Ashish ,

Have you created an applet which would run the j2ee code on jail server. We are trying to do the same thing can you please guide us how to go about it

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Re: New Virtual Programming Lab (VPL) module

by Mónica Guerrero - Friday, December 12, 2014, 6:21 AM

Hello, Juan Carlos.I have a question. I have two virtual machines one for moodle and one for jail-server. Virtual machines are in bridge mode. Moodle has a private ip 172.18..XX and public ip 190.96.X.X For the jail-server i have private ip 172.18.X.X. I have no problem for connection with jail-server and moodle in the internal network. However when I access Moodle from public ip 190.96.XX I have no connection with the jail-server, I am using port 80. What should I do to have connection with the jail-server. I understand that requests come to moodle and east to jail-server therefore should work.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, December 12, 2014, 11:44 PM

Hello Mónica,

From VPL version 3, it is required that the browser can connect to the execution/jail server to monitor and interact with the running process.

Generally all the execution/jail servers must be accesible from internet. But only the ports used (http/ws and https/wss) of the servers need to be reachable.

In your case, if you don't want to use another public ip, you can set the "jail server" to use differents ports (80 and 443) than your moodle server. Configure your virtual machine hypervisor to port forwarding from your public ip (in this case shared with your Moodle server) to your jail server private ip. After that, you must access to your "jail server" using the public IP/name with the new port.

Best regards,
Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Antonio Lepore - Thursday, May 29, 2014, 12:10 AM

Hi Juan.

I've installed VPL, the jail-server in a virtualbox Ubuntu. In server cofiguration file /etc/vpl/vpl-jail-system.conf, I've setted just URLPATH=http://jailserver.it and #Port=8080. Then, i wrote http://jailserver.it:8080 in Execution servers config of the plugin. When I try to run my code, it appears this message: "PHP XMLRPC requiered". What does it mean and how i can solve this problem? Please help me!

Antonio.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Thursday, May 29, 2014, 8:40 PM

Hi Antonio,
I suppose that you are installing a 2.0.1 jail server. You're using incorrectly the URLPATH, this variable is part of the URL not the full URL. FOr example, if you set URLPATH=/HELLO your URL for your serviice must be http://jailserver.it:8080/HELLO.
The message you found say that your PHP don´t has the xmlrpc extension. VPL requires this PHP extension to communicate with the jail server.
Best regards.

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Re: New Virtual Programming Lab (VPL) module

by Antonio Lepore - Friday, May 30, 2014, 5:21 AM

Hi Juan,

i setted my file in this way. I have some problem with xmlrpc, but, if you don't mind, can you take a look to my file conf, thanks!

#

#vpl-jail-system config file

#

#Format VAR=VALUE #no space before and after "="

#JAILPATH set the jail path

JAILPATH=/jail

#MIN_PRISONER_UGID set start first user id for prisoners

MIN_PRISONER_UGID=10000

#MIN_PRISONER_UGID set the last user id for prisoners

MAX_PRISONER_UGID=20000

#MAXTIME set the maximum time for a request in seconds

MAXTIME=600

#Maximum file size in bytes

#MAXFILESIZE=64000000

#Maximum memory size in bytes

#MAXMEMORY=2000000

#Maximum number of process

#MAXPROCESSES=500

#Path to control directory. the system save here information of request in progress

#CONTROLPATH="/var/vpl-jail-system"

#Limit the servers from we accept request

#IP or net (type A, B and C) separate with espaces

#Format IP: full dot notation. Example: 128.122.11.22

#Format net: dot notation ending with dot. Example: 10.1.

#TASK_ONLY_FROM=10.10.3.

#To serve only to one interface of your system

#INTERFACE=128.1.1.1

#Socket port number to listen for connections (http: and ws

#default 80

#PORT=8080

#Socket port number to listen for secure connections (https: and wss

#default 443

#SECURE_PORT=443

#URL path for task request

#act as a password, if no matches with the path of the request then it's rejected

URLPATH=/unimol.

The field in moodle is "http://jail:8080/unimol".

Is this correct?

Antonio.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, May 30, 2014, 8:40 PM

You must remove "#" from "#PORT=8080" and may be that you need to set the SECURE_PORT, for example you may set it to 8081.

Best regards

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Re: New Virtual Programming Lab (VPL) module

by Antonio Lepore - Friday, June 6, 2014, 10:05 PM

Hi Juan, thanks for your ansie. I ' ve many questions.

1)What do I write into The file vpl_debug.sh And vpl_evaluate.sh?

2) In Tab "Similarity", i Can upload one file. What does It Mean, that I can use this file like comparison method with students' test?

Thanks for your time And help!

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Saturday, June 7, 2014, 1:04 AM

Hi Aivar,
Promises must be fulfilled. VPL v3.1 (still beta) is ready to be downloaded from GitHub and arrives with the web service that I promised to you. To develop the client go to "tests/webservice_client.php" a test client that has the documentation inside.
Best regards

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Re: New Virtual Programming Lab (VPL) module

by Antonio Lepore - Sunday, June 8, 2014, 8:46 AM

Hi Juan,

I've a question for you. I've this file "vpl_evaluate.cases".

   1 Case = TC1
    2 Input = 5
    3 2
    4 
    5 Output = La somma tra 5 e 2 e' 7
    6 
    7 
    8 Case = TC2
    9 Input = -3
   10 -7
   11 
   12 Output = La somma tra -3 e -7 e' -10
   13 
   14 
   15 Case = TC3
   16 Input = 5
   17 2
   18 
   19 Output = La somma tra 2 e 5 e' 7

How I can evaluate every single case? For example

TC1 = 20%,TC2 = 30%,TC3 = 50%? Thanks for your help.

Antonio Lepore

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, June 9, 2014, 5:36 PM

Hi Antonio,

Quoting from documentation

"When an error (the output of a test case does not match with any expected value) is found, the value "grade_range/number_of_cases" is deducted from the mark. This value can be set by the teacher with the following statement:

"grade reduction = [ value | percent% ]". The discount can be a percentage or specific value, in other cases is used the general criterion."

In your case the file "vpl_evaluate.cases" must be:

Case = TC1
      Grade reduction = 20%
      Input = 5
2

Output = "La somma tra 5 e 2 e' 7"
Case = TC2
      Grade reduction = 30%
      Input = -3
-7

Output = "La somma tra -3 e -7 e' -10"


Case = TC3
      Grade reduction = 50%
      Input = 5
2
 Output = "La somma tra 2 e 5 e' 7"

Best regards

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Gregorio dela Cruz Jr - Monday, November 28, 2016, 5:08 PM

Dear Mr. Juan Carlos,

Please allow me to post my concerns for the second time.

My objective is to try the functionalities of the VPL first before pushing it to our organization.

Using a Windows 10 host OS, I have setup Moodle 3.1 on virtual machine with Ubuntu 16.04 OS and VPL Jail Server on another virtual machine with Ubuntu 16.04 OS also.

For the networking part, I have configured Adapter 1 as Bridged Network and Adapter 2 as Internal Network. The host and 2 Ubuntu machines can talk to each other. I've tested that through the ping command. I am able to access also the Moodle from any of the 3 machines (host and 2 guests).

For the VPL Jail Server, I believe it is running because when I access the site http://192.168.1.40:8080/OK, the output is also OK.

From the Moodle, I also setup the execution server which is http://192.168.1.40:8080/jailserver, where /jailserver is the one I typed in the jail server URL path.

The problem: When I run for example a C or Java program, I always get the message "No execution server found" (something like that).

Is the design that I am currently implementing is really doable or possible? If yes, what could be the solution?

If no, what alternative you would suggest?

Thank you very much.

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Juan Carlos Rodríguez-del-Pino - Monday, November 28, 2016, 8:18 PM

Hello Gregorio dela Cruz Jr,

I think that your problem is related to your virtualbox network configuration. I suggest you to use in Moodle machine and Execution server machine a NAT network and port forwarding.
80 => 80 for Moodle machine
8080 => 8080 for execution server

Set as URLs your host machine name or IP. e.g.
http://hostsname:8080/jailserver

Ofcourse, the 80 and 8080 ports of your hosts (windows 10) must be opened.

Best regards,
Juan Carlos.

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Gregorio dela Cruz Jr - Wednesday, November 30, 2016, 12:16 PM

Thank you Mr. Juan Carlos. Fortunately, I was able to make it up and running already using a bridged network. However, I am very glad to try your recommendations also to increase the options.

I am also happy to successfully run C++, Java, Python, Assembly and SQL codes with test cases. However, when a ran html pages, not output is shown on screen. I believe that this is resource-related or do I need to install something on the jail server?

My regards and warmest thanks to you...

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Juan Carlos Rodríguez-del-Pino - Wednesday, November 30, 2016, 7:44 PM

Dear Gregorio de la Cruz Jr,

VPL 3.2 has just been released, I think an upgrade is what you need.

Best regards,

Juan carlos

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Gregorio dela Cruz Jr - Thursday, December 1, 2016, 12:31 PM

Dear Sir,

I will try. Thank you.

I have seen another issue on file submission. The file (e.g. C++ program) being submitted by the students do not appear on the teacher's page. But on the student's page, it clearly shows that it has already been submitted because the student can no longer go back to the file.

What workaround should I consider?

Thanks and regards,

Gregorio dela Cruz Jr.

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Juan Carlos Rodríguez-del-Pino - Thursday, December 1, 2016, 9:20 PM

Dear Sir.
I can't reproduce the problem, please, give me more details to try to replay it.

Best regards,
Juan Carlos.

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Gregorio dela Cruz Jr - Saturday, December 3, 2016, 6:15 PM

Dear Sir,

I have upgraded to VPL 3.2 but I noticed that the teacher can no longer see the "codes" being submitted by the student, unless he will "download" it. Before, the teacher can see/read the student's "codes" on his screen. This is very useful during manually grading the student's submission. It is a fact that not all files submitted by the students are 100% error-free. For codes with errors, we normally give grades proportionate to what have been done by the students.

a. Is there any option to enable this?

b. If none, how do i revert back to the old version of vpl (e.g. 3.1). I've tried uninstalling vpl 3.2 and put the older version back, but it was rejected by moodle, repeatedly suggested to use the new version.

Please refer to the screenshots taken from vpl 3.2, teacher's screen (Submission List and Grade pages).

Thank you very much.

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Gregorio dela Cruz Jr - Sunday, December 4, 2016, 5:52 PM

Dear Sir,

Here is the screenshot of what I had in vpl 3.1.5 but I can't see from vpl 3.2.

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Juan Carlos Rodríguez-del-Pino - Monday, December 5, 2016, 8:54 PM

Dear Gregorio,

this is a very important issue, but I can help you if I can not reproduce your problem. To show what is working may help but it will be better to see what fail.

I think that it may be a issue related to the theme are you using. Please tell me what Moodle version and theme (I hope not customized) are you ussing.

I will be listen to try to resolver your problem as soon as possible.

Best regards,
Juan Carlos

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Gregorio dela Cruz Jr - Tuesday, December 6, 2016, 7:59 PM

Dear Sir,

The Moodle version that I am testing now is 3.1. It is still on my local machine because I do lots of experiments and testing before deploying to the "live" machine.

As I have mentioned in my previous queries, in VPL 3.1.5, I can see (as a teacher) the programs/codes submitted by the students.

But when I upgraded to VPL 3.2, I can no longer see the programs/codes submitted by the students. Please refer to the given screenshots.

Thanks and regards.

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Re: New Virtual Programming Lab (VPL) module - Problem with connecting Moodle and VPL Jail Server on a VirtualBox

by Juan Carlos Rodríguez-del-Pino - Wednesday, December 7, 2016, 2:59 AM

I have been trying to reproduce (Moodle 3.1 + VPL 3.2 + clear and more themes) the problem that you reported without success. I think that I need more details as a saved html page that shows the problem. As a workaroud, till the problem be found and resolved, you can use the "copy" button in the grade page. This action will copy the current submission into the teacher workspace to test or review it.
If you will, sendme a saved HMTL page with the problem.

Best regards,
Juan Carlos.

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Re: New Virtual Programming Lab (VPL) module - Problem in running and evaluation of C program in Moodle and VPL plugin on a VirtualBox

by Gowri Ganesh N.S. - Friday, April 21, 2017, 2:09 PM

Dear Mr. Juan,

I'm using moodle - latest version 3.2 with the vpl plugin supported for the moodle and the vpl jail server 2.0.1.

As a teacher role I had created a VPL activity as

Hello world test in C

Due date: Friday, 28 April 2017, 5:30 AM
Requested files: hello.c (Download)
Type of work: Individual work
Grade settings: Maximum grade: 100
Run: Yes Evaluate: Yes
Automatic grade: Yes

Requested files

hello.c

    1 #include<stdio.h>
    2 int main()
    3 {
    4     printf("Hello World!");
    5     return(0);
    6 }

Execution files

vpl_run.sh

    1 #!/bin/sh
    2 gcc -Wall -o vpl_execution *.c

vpl_debug.sh

vpl_evaluate.sh

vpl_evaluate.cases

    1 Case = Test1
    2 output="Hello World!
    3 "

Having the above setup for my VPL activity for the simple hello world program. The student is not getting the run and evaluation icons enabled and not able to run and evaluate[see the screenshot that icons for run, evaluate are disabled].

I had tried with both setting with the above script using compiler command setting[gcc -Wall -o vpl_execution *.c] and also without entering this command in the vpl_run.sh.

(Note for my python course I'm able to both run and evaluate[see the screenshot that python course has enabled icon for run and evaluation ])

Kindly help what should I do to run and evaluate the program as a student and also to do the test activity as a teacher?

Attachment cprogram with run and eval icons disabled.png

Attachment python program with run and evaluation icon enabled.png

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Re: New Virtual Programming Lab (VPL) module - Problem in running and evaluation of C program in Moodle and VPL plugin on a VirtualBox

by Juan Carlos Rodríguez-del-Pino - Thursday, May 4, 2017, 11:26 PM

Dear Mr. Gowri,
thanks for the screenshots. I think, based on the screenshots, that you forget to save the code. Notice that the contents in "requested files" are transferred in the first access to the student workspace, but you requiere to save it to run or evaluate it.
See the differeces between the two screenshots, in the C screenshot the "save" button is active. If there is any change not saved in the editor the "save" button is active and the "run", "debug" and "evaluate" buttons are deactivated.

Best regards,
Juan Carlos.

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Re: New Virtual Programming Lab (VPL) module - Problem in running and evaluation of C program in Moodle and VPL plugin on a VirtualBox

by Khadija EL KHARKI - Wednesday, May 10, 2017, 7:11 AM

Dear Mr. Juan Carlos

when i running my program, i have this error

and also this error

/tmp/ccIiLrVP.o: In function `main': vpl_evaluate.cpp.text+0x702a): multiple definition of `main' /tmp/ccvnkOS3.o:Pratique.cpp.text+0x0): first defined here collect2: error: ld returned 1 exit status

In attach you find the scripts that I use for the configuration of my avtivity.

I need help solving my problem

VPL_Scripts.zip

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Re: New Virtual Programming Lab (VPL) module - Problem in running and evaluation of C program in Moodle and VPL plugin on a VirtualBox

by Gowri Ganesh N.S. - Thursday, June 8, 2017, 2:25 PM

Dear Mr. Juan,

Sorry for the late reply.

Thanks I got it resolved.

with Best Regards,

N.S. Gowri Ganesh

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New Virtual Programming Lab (VPL) module - Problem with executing HTML pages

by Prakash Raju - Thursday, December 1, 2016, 6:59 PM

Hi Juan,

I have VPL 3.2 installed. Buy still could't figure out a way to run HTML pages and auto evaluating them. Right now i don't have evaluate option enabled at all. (See screenshot below). For HTML pages, how are we supposed to give the test case.

Also i would like to know, if we can bring in oracle and JSP inside VPL. If yes, Kindly give me your suggestions of doing the same.

Thanks,

Praveen Kumar

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Re: New Virtual Programming Lab (VPL) module - Problem with executing HTML pages

by Juan Carlos Rodríguez-del-Pino - Thursday, December 1, 2016, 10:56 PM

Hi Praveen,
Sorry, but currently (by default) VPL can't test GUI programs. I don't know how to test HTML, but I give you an script to test the HTML and CSS files sending it to w3c.

Best regards,
Juan Carlos.

#!/bin/bash # script for validate HTML and css in VPL sending files to w3c.org validators # Copyright (C) 2014 Juan Carlos Rodríguez-del-Pino # License http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later # Author Juan Carlos Rodríguez-del-Pino <jcrodriguez@dis.ulpgc.es> #load common script and check programs . common_script.sh check_program x-www-browser get_source_files htm html HTM HTML RESULT_FILE=vpl_validation_index.html cat > $RESULT_FILE <<END_OF_HTML <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Resultados de la validación</title> </head> <html> <h1>Resultados de la validación (HTML y CSS)</h1> <ul> END_OF_HTML for FILENAME in $SOURCE_FILES do curl -m 2 -s -F "uploaded_file=@$FILENAME;type=text/html" -F "charset=utf-8" -F "doctype=Inline" -F "group=0" http://validator.w3.org/check > $FILENAME.html grep -E "Passed, .*>1 warning" $FILENAME.html > /dev/null if [ "$?" != "0" ] ; then ERRORSLINE=$(grep -E "Errors?,.*warning" $FILENAME.html) echo "<li><a href=\"$FILENAME.html\">$FILENAME</a> (<a href=\"$FILENAME\">original</a>)$ERRORSLINE</li>" >> $RESULT_FILE else echo "<li>$FILENAME passed (<a href=\"$FILENAME\">original</a>)</li>" >> $RESULT_FILE fi done get_source_files css for FILENAME in $SOURCE_FILES do curl -m 2 -s -F "file=@$FILENAME;type=text/css" -F "profile=none" -F "usermedium=all" -F "warning=1" http://jigsaw.w3.org/css-validator/validator > $FILENAME.html grep -E "Congratulations! No Error Found\." $FILENAME.html > /dev/null if [ "$?" != "0" ] ; then echo "<li><a href=\"$FILENAME.html\">$FILENAME</a> (<a href=\"$FILENAME\">original</a>)</li>" >> $RESULT_FILE else echo "<li>$FILENAME passed (<a href=\"$FILENAME\">original</a>)</li>" >> $RESULT_FILE fi done cat >> $RESULT_FILE <<END_OF_HTML </ul> <p>Como validadores se han usado el <a href="http://validator.w3.org">W3C Markup Validator</a> para html y <a href="http://jigsaw.w3.org/">W3C CSS Validator</a> para CSS </body></html> END_OF_HTML cat > vpl_wexecution <<END_OF_SCRIPT #!/bin/bash x-www-browser $RESULT_FILE END_OF_SCRIPT chmod +x vpl_wexecution

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Re: New Virtual Programming Lab (VPL) module - Problem with executing HTML pages

by Prakash Raju - Friday, December 2, 2016, 6:45 PM

Thanks you Juan. That should be very useful for me.

Sorry to bother you again. But can we execute jsp programs from VPL. If yes, how can we bring tomcat server into jail server??

Thanks,

Praveen

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Re: New Virtual Programming Lab (VPL) module - Problem with executing HTML pages

by Juan Carlos Rodríguez-del-Pino - Friday, December 2, 2016, 8:29 PM

Sorry, I forgot answer this question in the previous post.

I think that it may be very difficult to run tomcat into a JailServer. Notice that the politic of VPL is that every execution is independent and don't left changes after finished. Launch an separated Tomcat for every run may be dificult. I have'nt reach to do this with VPL.

Best regards,
Juan Carlos.

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Re: New Virtual Programming Lab (VPL) module - Problem with executing HTML pages

by deepa ganu - Saturday, December 3, 2016, 2:03 PM

Hi Jaun ,

BUt the script would only check the validations of a html and css accroding to w3c, but just like how we can write test cases for web pages using selenium , can we write it too and trigger the selenium framework programatically to have a functionality check. Coz along with the HTML page we are looking for javascript n functionality check too. Lemme know what you think about this?

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Re: New Virtual Programming Lab (VPL) module

by Gerrit Leder - Friday, February 24, 2017, 4:47 PM

Hello,

thanks for vpl. The download of the jail archive was very slow...

BR

Gerrit

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Re: New Virtual Programming Lab (VPL) module

by deepa ganu - Friday, November 6, 2015, 7:37 PM

Hi jaun

can u please help us with this

a) Is the jsil server multi threaded. We are currently using a single jail server.While the load is less (let us say less than 10 users) there is no problem .However when the load is much more like 300 users simultaneously calling run we suspect that the jail server is responding to the ready request with not available.

b) If the jail server is not multithreaded how do we increase the number of jailservers without enhancing the physical machines?

c)If the jail served is indeed multithreaded how do we control its threading policy.

Do u think the problem is vpl plugin or jail server. Should we use load balancing server with moodle or add more jailnservers

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Saturday, November 7, 2015, 12:39 AM

Hello Deepa,
Answer a) Yes the jail server can run multiple task at the same time. The algorithm used to balancing the load first ask the selected server if it can run a the new task (test if can give the needed memory to the task). If no server can run the task the system say "no server available".
If you retry the action the system will retry the test.
Answer b) I think that the best way to use a good server is using virtualization software. VMware technologie (vSphere) may be a good solution.
Answer c) Currently VPL has a unique load balancing politic. Try reducing the max memory for the tasks you use.

The problem you describe are related to VPL not to Moodle, I think that the solution is increase your jail servers (power or number). You also can try increasing the swap area in your jail servers to support more number of task simultaneously, but this can have an bad effect in the performance.

Think about the resources needed to run 300 task simultaneously.

Best regards.

Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Steve Towson - Thursday, August 19, 2010, 1:37 PM

Hello.

What programming languages does it support? Just C? How about Python?

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Saturday, August 21, 2010, 5:33 PM

Hello Steve.
VPL supports other languages such as Ada, Java, C++.
You can find the list of supported programing languages at the page
http://vpl.dis.ulpgc.es/index.php/documentation/31-supported-programming-languages
Currently Python is not supported in the sense of syntax highlighting and files comparison, but this does not prevent to install an interpreter on a jail-server and execute code written in this language.
If you wish I can add "Python support" at the todo list.
If you have any problem installing a jail-server does not hesitate to ask me.

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Re: New Virtual Programming Lab (VPL) module

by Gulshan Kumar - Friday, September 17, 2010, 4:05 PM

Dear Juan,

I have followed every step as mentioned in VPL Docs (for installation and configuration), but encountering the error "No jail server available" while 'Run'ing the C program. I have a CentOS 5.3, with PHP5.3 and Java 1.6.0 installed.

Please guide me.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, September 17, 2010, 9:27 PM

Dear Gulshan
Check this please:
1) After installing the jail-server you can use a “telnet” to check that the server is accepting requests. Don’t forget to use the adequate port with ”telnet” (the port number is set at "/etc/xinetd.d/vpl-xmlrpc-jail", but may change with NAT configuration). The server should respond with an error message because it expects an http request. If no reply you may have a server configuration issue or firewall problem.
2) Check that the URL you are using is according with the “-uri” parameter at "/etc/xinetd.d/vpl-xmlrpc-jail"
3) If you need more information you can add "-d 255" in “server_args” at "/etc/xinetd.d/vpl-xmlrpc-jail" to get detailed information in the system log (jail-server).

I am pleased to inform you that version 1.2 is available. It can give you more information about connection problems.

Please, let me know if this solves the problem

Best regards

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, September 17, 2010, 11:04 PM

Dear Gulshan,
In the previous post I forgot to tell you that you should check the memory requirements of the activity. If your memory requirements are greater than the maximum value configured on the jail-server, then it will reject the request.

Kind regards.

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Re: New Virtual Programming Lab (VPL) module

by Gulshan Kumar - Sunday, September 19, 2010, 11:55 AM

Dear Juan,

Thanks for your quick response, right now I'm out of town, but will definitely look into what you have suggested.
And will bother you again (if I stuck somewhere), i hope you don't mind ?
Again thanks for your reply.

Regards,

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Re: New Virtual Programming Lab (VPL) module

by Gulshan Kumar - Monday, September 20, 2010, 12:03 PM

Dear Juan,

I have checked everything as you have suggested, telnet is opening a blank screen on the port mentioned at "/etc/xinetd.d/vpl-xmlrpc-jail"; but now getting a different kind of error it says 'Not executed'.

Thanks,

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, September 20, 2010, 8:43 PM

Dear Gulshan Kumar,
Your instalation is now working, the message indicate that you do not generate the apropiate "vpl_execution" file by executing the "vpl_run.sh" script.
For example a simple "vpl_run.sh" for C language may be
---------begin of file--------------
#!/bin/sh
gcc -Wall -o vpl_execution *.c
----------end of file--------------
I think that this may be the last step to have a simple activity running.

Sorry, I'd like to ask you a question out of topic : are you relative of the famous Indian Bollywood movie producer?

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Monday, September 20, 2010, 8:52 PM

I'm getting the same error. What would be an example of the file for Java? Once I make it, can I set it as the default for all assignments or do I have to edit it for each?

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Tuesday, September 21, 2010, 1:07 AM

Dear Brandon
A "vpl_run.sh" file content for Java language may be
---------begin of file--------------
#!/bin/sh
. vpl_environment.sh
#this path may vary on different jail-server
PATH=$PATH:/usr/lib/jvm/java-1.6.0-openjdk/bin
javac -J-Xmx128m *.java
NAME=$(basename $VPL_SUBFILE0 .java)
if [ -f $NAME.class ] ; then
echo "#!/bin/sh" >> vpl_execution
echo "PATH=\$PATH:/usr/lib/jvm/java-1.6.0-openjdk/bin" >> vpl_execution
echo "java -Xmx128m $NAME" >> vpl_execution
chmod +x vpl_execution
else
echo "Not compiled or error in filename"
echo "The main method must be in the first file."
fi
----------end of file--------------
This script compiles all *.java files and generates a "vpl_execution" file to run the program starting at the main method in the first file.
The memory limit must be set to 256Mb or greater.
Others VPL activities can use this script file by using the "based on" option.

Please, let me know if this solves your problem
Best regards
Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Tuesday, September 21, 2010, 6:37 PM

Thanks for the help. I'm waiting for my hosting company to install the JDK instead of just the JRE so that javac is available. I'll let you know whether it works then.

If it does, you should definitely include sample vpl_run.sh files for various languages in the installation instructions. I would never have made up that file and without it, the add on is mostly a fancy text editor.

Brandon

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Tuesday, September 21, 2010, 8:46 PM

Dear Brandon
I have in my TODO list the task of make available basic VPL activities for as many languages as possible. This activities could be added easily to any course.
In your last post you said that your hosting company is going to install the JDK instead of just the JRE. I don't know about your instalation arquitecture, but you should note that you don’t need a compiler or interpreter on your Moodle server, except PHP. All the tools of programming languages must go in the jail-server. For security reasons, I don’t recommend using the moodle server as a jail-server, I strongly recomend to use virtual machines with readonly disks as jail-servers.

Best regards
Juan carlos

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Wednesday, September 22, 2010, 5:38 AM

Juan carlos,

I don't have much choice on using the same server. I'm running Moodle on a VPS. A second VPS or a machine with sufficient memory to run a virtual server inside are both prohibitively expensive. I'm also less worried about security issues because of the small number of users with access to my Moodle installation (any my ability to make their lives uncomfortable if they attack the server

). If my district ever decides to use this with multiple classes, I'll make sure they run the jail server in a virtual box.

With the current configuration (jail server on same box), where do I have to put the Java compiler so that the jail server can access it? Currently, javac is in the path:

/usr/local/jdk1.6.0_21/bin

As far as I can tell, the jail server has the path:

/jail

In /jail there are directories such as:

/jail/bin
/jail/home
/jail/usr

and so on.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Wednesday, September 22, 2010, 7:35 AM

The "/jail" directory is an adapted replica of the root file system, the processes in the jail sees the “/jail” directory as its root file system. You must use the same paths that in the host file system.

I suppose that your VPS is running Red-Hat, CentOS or equivalent linux distribution, if not, you may have problems with the scripts that start and stop the jail system because these scripts are made for these systems.

Do not hesitate to contact me if you have another question

Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Wednesday, September 22, 2010, 9:43 AM

Juan Carlos,

Hi again. Thanks for the help so far. This would be incredibly useful to get running.

Here's the current situation. I am running CentOS and the jail server does run. I know it runs because I can telnet to it and because I get, "Not executed" rather than a failed connection.

I copied the bin directory from my JDK installation to:

/jail/usr/local/jdk1.6.0_21/bin

My vpl_run.sh file looks like this:

#!/bin/sh
. vpl_environment.sh
#this path may vary on different jail-server
#PATH=$PATH:/usr/lib/jvm/java-1.6.0-openjdk/bin
PATH=$PATH:/usr/local/jdk1.6.0_21/bin
javac -J-Xmx128m *.java
NAME=$(basename $VPL_SUBFILE0 .java)
if [ -f $NAME.class ] ; then
echo "#!/bin/sh" >> vpl_execution
echo "PATH=$PATH:/usr/local/jdk1.6.0_21/bin" >> vpl_execution
echo "java -Xmx128m $NAME" >> vpl_execution
chmod +x vpl_execution
else
echo "Not compiled or error in filename"
echo "The main method must be in the first file."
fi

I'm stumped.

Brandon

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Wednesday, September 22, 2010, 7:11 PM

Hi Brandon,
First, you need to undo the copy of the JDK instalation to the “/jail” directory. In my last post I said that the “/jail” would be an adapted replica of the root file system, I omitted that this replica is made automatically by NFS. The vpl-jail-system service is the responsible to prepare the “/jail” directory (make the replica) and enable the vpl-xmlrpc-jail daemon.
You can use the command “service vpl-jail-system restart” to check if appear any error messages in this process.
If the vpl-jail-system start correctly you must see a read-only replica of “/bin” at “/jail/bin”. To add software to the jail system you only need to add software to the host system.

Juan Carlos.

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Wednesday, September 22, 2010, 8:17 PM

Juan Carlos,

Hmm. I deleted the copy and I changed my path back to what it would be on the local system. There are no errors in the log. I still get, "Not executed"

What resources are required by your preconfigured virtual machine (CPU, disk, RAM)? I'm sure my hosting company could handle the installation, but I'm doubtful that the account has the resources to run it. I might be able to get some financial support from my school if I can show how useful this would be.

Brandon

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Wednesday, September 22, 2010, 9:12 PM

Hi Brandon

I need more information to try to resolve the problem. Please copy the file “vpl_run.sh” to the file “vpl_evaluate.sh” and then use the button “evaluate” . This will give us more information about what is happening.

Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Thursday, September 23, 2010, 3:25 AM

JC,

The message is still "Not executed" When the "Evaluate" button is pressed. This is true with the same code in vpl_run.sh and vpl_evaluate.sh and with the code only in vpl_evaluate.sh (and nothing in vpl_run.sh).

B

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Thursday, September 23, 2010, 7:03 PM

Dear Brandon,

After take a closer look to the problems that you report, I think that you still have a jail-server problem. Please, check that the file system replica at the jail directory is working well (/jail/usr => /usr, /jail/bin => /bin and /jail/lib => /lib). I must notice that the jail-server for CentOS need a running NFS server.

To get more information about the problem add "-d 255" in “server_args” at "/etc/xinetd.d/vpl-xmlrpc-jail". This will generate a detailed report of the jail daemon executionin in the system log “/var/log/messages”.

If you don't found the problem, you can send me the "/var/log/messages” file to search it.

Best regards

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Sunday, September 26, 2010, 6:50 AM

Juan Carlos,

Thanks for all the help, but getting this to work is beyond me. I might try again in a year if I develop better skills with Linux.

One last question: Is there an easy way to uninstall the VPL module from Moodle? What changes to the Moodle database need to be undone on uninstall?

Brandon

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Wednesday, September 29, 2010, 2:07 AM

Thanks for helping me configure the server. It works great now!

For anyone else who got the jail server working but is having trouble getting Java files to compile and run, the attached TXT file contains code for vpl_run.sh and vpl_debug.sh that worked for me.

Brandon

vpl-files.txt

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, October 1, 2010, 12:03 AM

How to remove VPL from a Moodle server:
1. Make a backup
2. Remove all the instances of VPL
3. Remove the directory “…/moodle/mod/vpl”
4. Remove the directory “../moodledata/vpl_data”
I don’t know the whole effect of removing VPL tables.
5. Remove (at your own risk) the VPL DB tables: vpl, vpl_submissions, vpl_jailservers, vpl_variations and vpl_assigned_variations.

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Re: New Virtual Programming Lab (VPL) module

by Gulshan Kumar - Tuesday, September 21, 2010, 2:43 PM

Dear Juan,

Thanks for the help extended, but my setup doesn't seems to work (even failed to run a Hello World program in C). Now it is taking a lot time and after a minute or so it throws Jail Connection Timeout, Console Timeout and proxy timeout.
I hope there will be some more setting required.
And I am sorry to tell you that I am not relative to movie producer Gulshan Kumar, its just the name and music which is common wink

Thanks

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Tuesday, September 21, 2010, 6:40 PM

Dear Gulshan,
It seems that you are getting all the problems that we can offer. The symptoms indicate that you have a firewall configuration issue on the moodle server. You need to open the range of ports you have set in the general configuration of the module, if for any reason you can’t open these ports, you also can use the module without interactive execution by setting the script file “vpl_evaluate.sh” . The content of this file may be, in your case, equal to the content of “vpl_run.sh”. In this case, the output of the execution is saved and is show in different pages of VPL: the applet editor, the submission view, the evaluation page, etc.

Juan carlos

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Re: New Virtual Programming Lab (VPL) module

by Gulshan Kumar - Wednesday, September 22, 2010, 5:23 PM

Dear Juan,

Thank you very much for your help, problem has been resolved by opening the ports.

Are the configurations same for C++ and Java compiler?

Thanks

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Wednesday, September 22, 2010, 7:38 PM

Dear Gulshan

The configuration for C++ is almost identical to the configuration for C. You only need to change the compiler from “gcc” to “g++”. The java configuration is more complex due to the need to run the java interpreter.

Again, an off topic question: In which context do you plan to use the VPL module?

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Re: New Virtual Programming Lab (VPL) module

by Gulshan Kumar - Thursday, September 23, 2010, 6:21 PM

Dear Juan,

Right now I will stick to the C and C++.
Anyhow thanks for the help.

Actually I am using Moodle for my college, someday I was wandering about the plugins for moodle, and your work strike the bell. And here I am.
I am trying your VPL just out of curiosity, nothing special.

Thanks for the help.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Thursday, September 23, 2010, 7:12 PM

Thank Gulshan,
I just want to know about the use of the module.

In my last post for you, I forgot to say tthat you must change, at the compiler comman, the filenames from "*.c" to "*.cpp" or the extensión for C++ that you use.

Best Regards
Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by udara weerakoon - Saturday, June 11, 2011, 3:11 AM

Dear Juan,

I have tried to run "Hello world" C program according to your guidence given, but I'm receiving an access denied message as show in the picutre. Could you please help me to overcome this problem?

Thank you.

Udara.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Saturday, June 11, 2011, 6:39 PM

Dear Udara,

To bypass this problem (to run programs in console) you must not access to your Moodle from the same machine (the server machine).

This is a known problem (or behavior) of the latest versions of Oracle Java plug-in, for example IcedTea plug-in for Ubuntu doesn’t show this behavior. For security reasons, applets are forbidden to connect to the local machine. Really, applets only are allowed to connect to the server from where they were downloaded. Oracle Java plug-in seems that prioritizes the ban.

Best regards.

Note: the user can give more priviliges to a Java applet, but I think that in this case it is not needed.

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Re: New Virtual Programming Lab (VPL) module

by udara weerakoon - Tuesday, June 14, 2011, 3:48 AM

Dear Juan,

First, Thank you so much for your quick reply. I really appreciate it.

I'm browsing Moodle LMS using my desktop machine (which has windows xp operating system), but the Moodle server is a ubuntu based one. One more point, both Moodle and Jial services run on the same ubuntu server. I have installed icedtea6-plugin in my ubuntu server (server that has hosted both moodle and jial services), but still I am getting the same error message .

Thank you

Udara

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Tuesday, June 14, 2011, 4:54 PM

Dear Udara,
one question and one supposition:
Can you acces and run programs at the demo site http://vpldemo.dis.ulpgc.es/moodle with your Windows XP?
I suppose that you are using a firewall (at the client or server) that prevents the connection. If you can run programs at the demo site then the problem is at the server.
Best regards.

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Re: New Virtual Programming Lab (VPL) module

by udara weerakoon - Thursday, June 16, 2011, 3:09 AM

Dear Juan,

Yes, I can run programs at the demo site as both a student and a teacher without any problem. So, I don't think it is a problem in my desktop (client running on windows xp) machine, but probably the server. I have allowed port number 52000 in the firewall at the server. Do I need to configure the firewall (Server) any more?

Thank you.

Udara.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Thursday, June 16, 2011, 7:37 PM

You need to open, on Moodle server, the range of ports you have set in the general configuration of the VPL module.

Best regards.

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Re: New Virtual Programming Lab (VPL) module

by udara weerakoon - Tuesday, June 21, 2011, 4:40 AM

Dear Juan,

Thank you very much, I appreciate your helping me.

My confussion is, Do I need to add any records to my iptables of the server, since both Jail and Moodle services are running in this server?

Thank you.

Udara.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Tuesday, June 21, 2011, 6:36 PM

You need to open the port range because the connections not only come from the Jail, also come from the applet console at the browser.

Best regards.

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Re: New Virtual Programming Lab (VPL) module

by udara weerakoon - Friday, June 24, 2011, 3:49 AM

Dear Juan,

Great! Thank you so much

Udara.

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Re: New Virtual Programming Lab (VPL) module

by Antonio Lepore - Thursday, May 29, 2014, 12:16 AM

Sorry, I search "/etc/xinetd.d/vpl-xmlrpc-jail" in server directory but nothing. How is possible this?

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Thursday, May 29, 2014, 8:43 PM

Hi Antonio,
the new 2.X jail server software does not uses xinetd

Best regards.

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Re: New Virtual Programming Lab (VPL) module

by OEE_Dev KW_Univ - Thursday, March 24, 2011, 10:31 PM

Hi, I am trying to run a java program using your interesting VPL module. I Installed jail server under CentOS 5.5 and everything seems to be fine. I did clean installation for CentOS and configure it by following steps mentoined in your documentation, i.e. I didn't use preconfigured installation and I don't want to use virtual machine. I am running jail server on separate machine and connecting it to the other server machine where moodle is running.

But I am getting timeout when attempting to run some code. When I checked the /var/log/messages file , it indicates that error has bee generated that POST is expected and found GET instead.

I reviewed the documentation provided on your site but I can NOT well understand what is meant by the following statement :

" "-uri path". Sets the path to add the URL of the server. If we had a server named "localhost" the URL to use in requests would be "http://localhost:port/path. The default is "/RPC. This parameter can be used as key, because if not used in the URL the request is not heeded.
"-d #". Sets the debugging level, a greater number means more information in the system logs. "

What is meant by server? server where moodle is running? Or server where jail service is running? I am running jail server on separate machine and I configured firewall settings.
What is meant by "/RPC"?
Do I need a value for "/path"? What is it?
What is value for "-uri" argument?

I didn't set any *.sh file, do i need them even I want to run each submission alone?

thanks and keep pacing forward

Best.

Oee.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, March 25, 2011, 1:57 AM

Hi Oee,
I’ll try to answer your questions

Q1. What is meant by server? server where moodle is running? Or server where jail service is running? I am running jail server on separate machine and I configured firewall settings.
A1. In this paragraph “server” refers to “jail server”.

Q2. What is meant by "/RPC"?
A2. The requests from the “moodle server” to the “Jail server” use XMLRPC protocol and “/RPC” is the default path in the URL of a XMLRPC service. Omitting the “-uri” parameter is equivalent to use “-uri /RPC”

Q3. Do I need a value for "/path"? What is it?
A3. To simplify the configuration you may use “-uri /” then you can use as URL of your “jail server” http://hostname:port

Q4. What is value for "-uri" argument?
A4. Well, “uri” is the parameter name for the “path” in the URL to the “jail server” (http://hostname:port/path)

Q5. I didn't set any *.sh file, do i need them even I want to run each submission alone?
A5. The VPL versions <=1.3 always need to setup “vpl_run.sh” file or “vpl_evaluate.sh” file to run programs. You may use the "based on" option to reduce the script files setting. The VPL 1.4 version will be loaded with default scripts for common programming languages as C, C++, Java, C#, etc.

A basic file for “vpl_run.sh” or “vpl_evaluate.sh” for Java may looks like this:
===========================
#!/bin/bash

#load VPL environment vars
. vpl_environment.sh
#reset LC_ALL
export LC_ALL=en_US.utf8
#Set path to JDK
PATH=$PATH:/usr/lib/jvm/java-1.6.0-openjdk/bin
#compile
echo "The first file/class must have the Main method"
javac -J-Xmx64m *.java
NAME=$(basename $VPL_SUBFILE0 .java)
if [ -f $NAME.class ] ; then
echo "#!/bin/bash" >> vpl_execution
echo "export LC_ALL=en_US.utf8" >> vpl_execution
echo "PATH=\$PATH:/usr/lib/jvm/java-1.6.0-openjdk/bin" >> vpl_execution
echo "java -Xmx64M -enableassertions $NAME" >> vpl_execution
chmod +x vpl_execution
else
echo "No compiled or error in file name"
fi
===========================

Examples of /etc/xinetd.d/vpl-xmlrpc-jail file:
1)
====================================
service vpl-xmlrpc-jail
{
…
port = 8080
# no server_args parameter
…
}
=====================================
If the server name is “jail1.uni.edu” then the URL to access the service in the “jail server” would be http://jail1.uni.edu:8080/RPC

2)
====================================
service vpl-xmlrpc-jail
{
…
port = 52000
server_args = -uri /
…
}
=====================================
If the server name is “jail1.uni.edu” then the URL to access the service in the “jail server” would be http://jail1.uni.edu:52000

Hope that this helps you.
Best regards.

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Can't run c++ programs

by OEE_Dev KW_Univ - Tuesday, March 29, 2011, 10:06 PM

Thank you for your response.

When I am accessing the jail server via web browser firefox I got the following reply written in a blank page :

Server: vpl-xmlrpc-jail
Connection: close
Content-Length: 41
Content-Type: text/html;chartype=UTF-8

<html><body>Not Implemented</body></html>

What does this message mean? Is my jail server working well and ready to accept request?
given that when I telnet jail server I got empty screen.

I have postponed testing compiling and running Java programs as I realized that 
it would be better to firstly test C++ programs because C++ compiler is already installed 
on the jail server and it works pretty fine and I can compile/execute c++ programs from 
from command line using this command:

g++ -Wall -o vpl_execution test.cpp


So please help me first detecting and tackling compiling/executing C++ programs first.

one more question:
The ports range set in general settings page of a the module should be opened on the moodle server or jail server?

best.

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Re: Can't run c++ programs

by Juan Carlos Rodríguez-del-Pino - Thursday, March 31, 2011, 2:41 AM

Sorry for the delay of the response.
The message you get from the server is correct, your jail server is running and is reachable.
If you want to compile and run C++ programs you could use for “vpl_run.sh” and “vpl_evaluate.sh” a script like this:

------------------------------

#!/bin/bash
g++ -Wall -o vpl_execution *.cpp

-----------------------------
The port range set in the general setting should be opened in the Moodle server only.

Best regards.

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Can't run c and c++ programs

by Tanaji Patil - Saturday, August 1, 2015, 7:16 PM

Dear Juan,

I have installed Moodle 2.9 Server with mod_vpl 3.1.3 on CentOS 7 64-bit. Then on another server (again CentOS 7 64-bit) I installed vpl-jail-system-2.1.1. I tested it through browser and the status is OK. Then I tried to execute programs from moodle vpl activity, I am able to execute Java, Python programs but I am getting error for C & C++ programs as "gcc: error trying to exec 'cc1': execvp: No such file or directory".

Am I missing anything? I have executed install-vpl-sh script to install the jail-server.

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Re: Can't run c and c++ programs

by Juan Carlos Rodríguez-del-Pino - Saturday, August 1, 2015, 11:28 PM

Hello Tanaji,
vpl-jail-system-2.1.1 has been tested on Ubuntu 14.04 LTS and is the linux distribution that we recommended to use. I don't have a answer to your problem, I need spare time to reproduce your installation and find out the problem. If your are in a hurry, try using Ubuntu, if not, you may wait my response in a few days.

Best regards.
Juan Carlos Rodríguez

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Re: Can't run c and c++ programs

by Tanaji Patil - Sunday, August 2, 2015, 12:10 PM

Hello Juan,

Thanks for reply. I will try it on Ubuntu 14.04 LTS.

Best Regards

Tanaji Patil

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Re: Can't run c and c++ programs

by Tanaji Patil - Sunday, August 2, 2015, 5:15 PM

Hi Juan,

Thanks a lot. I just tried on Ubuntu 14.04 LTS Server and it is working fine.

Regards,

Tanaji Patil

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Re: Can't run c and c++ programs

by Juan Carlos Rodríguez-del-Pino - Monday, August 3, 2015, 2:37 AM

Hi Tanaji,
thanks for reporting your experience.

Best regards.
Juan Carlos Rodríguez

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Re: Can't run c++ programs

by manoj joseph - Wednesday, October 25, 2017, 7:18 PM

how to run and comple multiple c files in vpl pluging?

It showing two mains found..

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Re: Can't run c++ programs

by Juan Carlos Rodríguez-del-Pino - Friday, October 27, 2017, 2:55 AM

might be that you have two mains functions in your code files?

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Re: Can't run c++ programs

by manoj joseph - Friday, October 27, 2017, 1:47 PM

I have two separate programs ,both having main fuctions .Both programs works if we run after deleting one file.If 10 files in vpl assignment how do we select each file for running.In vpl all programs running as single project i think

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Re: Can't run c++ programs

by Andrei Băutu - Friday, October 27, 2017, 3:00 PM

I believe you are correct. VPL tries to compile all files (similar to how you would compile a program from multiple files). That's why it complains about your files having multiple main functions.

So if you want to give your students 2 programming task (eg. one to print hello world and the other to add two numbers), then you'll have to create 2 VPL activities.

Your problem is a bit related to my question here https://moodle.org/mod/forum/discuss.php?d=154988#p1447624 : How can I use one VPL activity for multiple programming tasks? OR (alternative option) How can I organize multiple VPL activities into some kind of group (so that the course page has less entries)?

Cheers,
Andrei

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Re: Can't run c++ programs

by manoj joseph - Monday, October 30, 2017, 12:00 PM

Then,Why did they kept muliple file upload ?

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Re: Can't run c++ programs

by Andrei Băutu - Monday, October 30, 2017, 4:40 PM

There are many use-cases for programming tasks that require multiple files. Some examples:

- you ask your students to define a C++ library in separate files (header file and cpp file)

- you ask your students to write some program that read from a data file and you allow them to upload the program code + the data file.

- you ask your students to create a Drupal module or a Moodle plugin (which by definition have multiple files)

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Re: Can't run c++ programs

by manoj joseph - Monday, October 30, 2017, 7:32 PM

Thank You sir for your reply

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Re: Can't run c++ programs

by Juan Carlos Rodríguez-del-Pino - Monday, October 30, 2017, 8:36 PM

A program can have several source files, in fact is the common case.

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Re: New Virtual Programming Lab (VPL) module

by OEE_Dev KW_Univ - Wednesday, March 30, 2011, 1:45 AM

Dear,

What jail server version should I install ? vpl_xmlrpc_jail-1.0.1.tar.gz OR vpl_xmlrpc_jail-1.1.tar.gz OR vpl_xmlrpc_jail-1.0.tar.gz ?

I am running CentOS 5.5 clean installation on different machine other than Moodle server machine (Windows2000 server, PHP 5.2, IIS) and installed VPL-module version 1.3

Here are symptoms:

When I click evaluate I got "No jail server available" error.
When I click run , I got "Running (Timeout)"
When telnet the jail server:port I got blank screen only
and when access the server through the designated port via web browser, I got blank page with this text in it:

Server: vpl-xmlrpc-jail
Connection: close
Content-Length: 41
Content-Type: text/html;chartype=UTF-8

<html><body>Not Implemented</body></html>

By the way, How can I uninstall jail server from the machine?

Please guide me.

thank you for your effort and time

best.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Thursday, March 31, 2011, 3:21 AM

Hi again,
You should install vpl_xmlrpc_jail-1.1.tar.gz.
The symptoms show that your VPL module cannot reach the “jail server”.
1)    Check the URL of the jail server you set in the general setting. Be carefull with the URL path field (http://jailservername:jailserverport[/path]), it must match the configuration at file "/etc/xinetd/vpl-xmlrpc-jail" (-uri) in the "jail server".
2)    Check that your firewall lets the IIS/PHP server access the “jail server”. You can stop the firewall for a minute to check if the firewall configuration is the problem.

To uninstall the “jail server” from Centos use this steps
1)    Run “chkconfig --del vpl-jail-system”
2)    Remove “/etc/vpl” directory
3)    Remove “/jail” directory
4)    Remove “/etc/xinetd.d/vpl-xmlrpc-jail” file
5)    Run “service xinetd restart”

Best regards.

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Re: New Virtual Programming Lab (VPL) module

by Prav M - Thursday, September 13, 2012, 1:20 AM

Hi Juan,

I followed the instructions for installing Jail server on Ubuntu. When I try to access the vpl from Moodle, it give me a server busy. When I try to access via web page, this is what I get:

This xml file does not appear to have any style information associated with it. THe document tree is shown below.

<html>

<body>

<br/>http GET request not implemented

</body>

<html/>

And can you explain the first portion of the vpl_xmlrpc-jail xinetd file?

protocol=tcp

type=UNLISTED

user=root (what user is this?, should we change it?)

server = /etc/vpl/vpl-xmlrpc-jail ( is this service file name?)

Also, in Ubuntu, do we install NFS? and should we open the port in /etc/services?

Thanks

Praveen

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, September 14, 2012, 9:18 PM

Hello Prav,
The problem using the jail seems to be that you configure your assignment to request too much memory and you configure the jail server with a low memory limit. To resolve this problem reduce the memory requested at “Resources limits|Maximum memory used” or increment the memory limit at the jail daemon config file “/etc/vpl/vpl-xmlrpc-jail.conf”.
xinetd options:
protocol=tcp
This is the type of network protocol used

type=UNLISTED
This is for named services (VPL is not asigned)

user=root (what user is this?, should we change it?)
This is the user that runs the service. It must be root.
server = /etc/vpl/vpl-xmlrpc-jail ( is this service file name?)
Yes, this is the program that manage the service (the VPL jail daemon)
You don’t need to install NFS in Ubuntu, this is required only for CentOS/RedHat 5
Best regards.

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Re: New Virtual Programming Lab (VPL) module

by Prav M - Saturday, September 15, 2012, 12:51 AM

The vpl-xmlrpc-jail.conf has only JAILPATH,MIN_PRISONER_UGID,MAX_PRISONER_UGID and MAXTIME.

Do I need to add MAXFILESIZE & MAXMEMORY?

And should I restart only the vpl-jail-system or also the xinetd?

Thanks for your help.!

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, September 17, 2012, 4:35 PM

To have more information about why the deamon says it is busy add "-d 8" in “server_args” at "/etc/xinetd.d/vpl-xmlrpc-jail". This will generate a detailed log of the jail daemon execution in the system log “/var/log/messages”.

If you don't found the problem, you can send me the file "/var/log/messages” to review it.

Best regards.

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Re: New Virtual Programming Lab (VPL) module

by Gerrit Leder - Friday, February 24, 2017, 12:31 AM

I have test data in vpl_evaluate.cases adopted from output test to "Hello World!"

Unfortunately there seems to be no input passing as command line arguments for my java class: The program detects no command line arguments.

I suppose that the input data specified is passed as "stdin" and not as the java command line argument.

Can this be changed?`

Or do you have a "vpl_evaluate.sh" for java classes that takes care of the command line argument input?

Thanks in advance!

Gerrit

vpl_evaluate.cases

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, February 24, 2017, 3:08 AM

Hello Gerrit,
sorry, but the current version of VPL do not support passing arguments to the program tested. We have received different requests to improve the tests configuration and we are working to add new features as you can see in
https://moodle.org/mod/forum/discuss.php?d=154988#p1390964
Passing command arguments to the tested program will be included in the new features of VPL 3.3.

Best regards,
Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Gerrit Leder - Friday, February 24, 2017, 11:45 PM

Thank you! Can I plz have a look at the 3.3 development version? Do I checkout branch 3.3 or 3.3dev best?

BR

Gerrit

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Wednesday, March 1, 2017, 11:38 PM

The brach 3.3dev is the correct one.

BR

Juan Carlos.

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Re: New Virtual Programming Lab (VPL) module

by Gerrit Leder - Thursday, March 2, 2017, 11:21 PM

I have one more question:

do you plan to release version 3.3 of VPL matching the release of moodle? And when will that roundabout be?

Thanks for your efforts!

BR

Gerrit

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, March 3, 2017, 12:33 AM

No Gerrit, I am not planning to release VPL 3.3 at the same time that Moodle 3.3, but it may coincide. Notice that current VPL is also compatible with previous Moodle versions.

Best regards,

Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Gerrit Leder - Wednesday, May 24, 2017, 3:50 PM

Hello Juan,

we are eagerly waiting for the command line parameter evaluation!

Another function we would like to see in this context, is a second button for execution of the application under test with the possibility to enter command line parameters, too!

Thanks in advance!

Gerrit

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, May 29, 2017, 8:00 PM

Hello Gerrit,
we want to release the new 3.3 release of VPL, but with the new features properly tested. We also are trying accomplish and pass, as most as possible, the Moodle prechecks for plugins. We have incorporated continuos integration to the VPL development process by using travis-ci.org. Notice that VPL is a large plugin and it's needed time to adapt the code to the new Moodle requirementsand detect and remove the errors added in this changes.
About to your especific question, a realistic prevision is that VPL 3.3 will be released on july. A new feature, among others, will be the possibility of adding command line to the program of each test. It's not clear to add command line to the run process in the IDE in this release.

Best regards,
Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Acqua Alta - Wednesday, August 14, 2019, 3:57 PM

Hi Juan,
Thanks for the great plugin.

According to this document:
https://vpl.dis.ulpgc.es/index.php/home/news
Since VPL 3.3.1, the default evaluation program supports sending 'information to the student program (or “program to run”) as command line arguments'.

How can it be done?

Just to be sure that I understand the info correctly, what I want to achieve is the following:
I want to create a VPL activity in which the students would have to write a C program that would pass arguments to the main function by using argc and argv.

Thanks in advance

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Re: New Virtual Programming Lab (VPL) module

by John Andrewartha - Friday, March 25, 2011, 6:11 AM

Sound like the Welcome to Linux Java Nightmare.

By default all Linux distro's install Open Java. It is still to immature to run most of the Real Java. Install Sun Java and it should work.

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Re: New Virtual Programming Lab (VPL) module

by Joel Gogwim - Wednesday, June 12, 2013, 6:04 AM

Hello Carlos,

Please I am in the process of installing the jail server following the documentation but continuously received the following error message.

[root@cbtmain vpl_xmlrpc_jail-1.0]# ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for g++... no
checking for c++... no
checking for gpp... no
checking for aCC... no
checking for CC... no
checking for cxx... no
checking for cc++... no
checking for cl... no
checking for FCC... no
checking for KCC... no
checking for RCC... no
checking for xlC_r... no
checking for xlC... no
checking for C++ compiler default output file name... configure: error: C++ compiler cannot create executables
See `config.log' for more details.
[root@cbtmain vpl_xmlrpc_jail-1.0]#

I need a help.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Thursday, June 13, 2013, 5:14 AM

Hi Joel,
The demon vpl_xmlrpc_jail is written in C++. I think that ‘configure’ is saying that you don’t have a C++ compiler (like g++) installed and need one to compile the demon.
Best regards.

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Finding the ID of VPL activity stored in DATABASE

by Prakash Raju - Tuesday, January 10, 2017, 10:11 AM

Hi Juan,

I would want to know the activity ID of each VPL activity. But, the $id variable inside /mod/vpl/view.php doesn't provide with the right activity ID that is stored in the database.

For example, the $id variable now states the activity ID to be 458 in my production server. But the maximum ID value is only 375 in VPL table

What would be the right approach to knowing the activity ID stored in the database for any specific VPL activity?

Thanks,

Praveen Kumar

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Re: Finding the ID of VPL activity stored in DATABASE

by Juan Carlos Rodríguez-del-Pino - Tuesday, January 10, 2017, 8:10 PM

Hello Praveen,
the parameter $id that may found in many places in the code are in most cases the $id of a CourseModule. Moodle uses the coursemodule table to save information for every activity and resource. This is the reason because you found $ID with larges values than the VPL ids.

If you want to get the ID of the VPL record you may use the object $vpl created with new mod_vpl( $id ).
and then
$vpl->get_instance()->id
you may found the var $vpl already created in the code.

Best regards.

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Re: Finding the ID of VPL activity stored in DATABASE

by Prakash Raju - Tuesday, January 10, 2017, 11:46 PM

Hi Juan,

Thank you so much. I found the issue and was actually using sub queries to get the VPL instance id. Your approach is much simpler.

One more help if you don't mind. I want the entire code student types from the VPL_IDE to be available in a JS variable, compare with specific keywords and if the keywords are not present in the program, prevent the program from submission for run or auto-evaluation.

To get the string from VPL_IDE, I referred to ace documentation and came up with

var editor = ace.edit("editor");

editor.getValue();

But, this approach didn't work. can you help me out with a better solution? Also, let me know how to stop the program from running or auto evaluating if string not found in the program

Thanks in advance,

Praveen Kumar

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Re: Finding the ID of VPL activity stored in DATABASE

by Juan Carlos Rodríguez-del-Pino - Wednesday, January 11, 2017, 4:50 AM

I think that you can get this behavior easier using "execution files" and the "based on" features of VPL.
Follow this steps (suppouse the target language is Java):
1) Create a VPL activity named "Base Java". This activity is not to be used for student, keep it always hidden.
2) Copy the default java run script from mod/vpl/jail/default_scripts into the vpl_run.sh at the "execution files" in "advance features". This activity is the base for new customized activities for Java.
3) Create the activity that you want to control (e.g. "Java1"). Use the "based on" option to derivate from the "Base Java" activity. At this moment this activity has the same behaivour than the default action when not customized activities detec Java files.
4) Customize the "Java1" activity adding code to the "vpl_run.sh" file. For example you want to avoid the exection and evaluation of the student code if the code contents "customize". Use this code:

#!/bin/bash
if [ -f vpl_execution ] ; then
     grep "customize" $SOURCE_FILES > /dev/null
     if [ "$?" == "0" ] ; then
          echo "message"
          rm vpl_execute
     fi
fi

Best regards,
Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Brandon Horn - Sunday, September 19, 2010, 11:47 AM

Are you able to provide (paid) installation of the VPL jail and configuration of the firewall?

Brandon

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, September 20, 2010, 8:38 PM

Sorry Brandon, but I do not provide VPL instalations/configurations for money. What I can do is to resolve any question you have regarding the installation of VPL for free.

I can suggest you that a linux expert installs VPL following the instruction provided in the documentation.

Juan Carlos

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Re: New Virtual Programming Lab (VPL) module

by Andrey Semenyuk - Friday, October 22, 2010, 2:47 PM

Mr. Juan Carlos,

We tried the VPL JAIL system. Examples C and Java work fine but C++ examples not working .
Could you help us?
Below are the configuration files and log files.
Thank you/

log_conf.txt

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, October 22, 2010, 6:12 PM

Hello Andrey,

I suppose that you are using a prebuilt “jail system” then please post the “vpl_run.sh” file of the C++ activity to have a complete picture.

A simple content of “vpl_run.sh” for C++ may look like this

---------begin of file--------------
#!/bin/sh
g++ -Wall -o vpl_execution *.cpp
----------end of file--------------

Best regards

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Re: New Virtual Programming Lab (VPL) module

by adrin diggs - Wednesday, November 17, 2010, 12:13 AM

Hi i am working on a VPL Moodle module, but I can not get C, C++, or Java to compile and execute. My "vpl_run.sh" looks like the one above for C++. And I was wondering am I to "Add file" vpl_execution, and then select it as one of the "files to keep when running". When I do this my /var/log/messages say vpl_execution: pemissions denied

help is needed: thankyou

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Wednesday, November 17, 2010, 5:10 PM

HI Adrin,
I need more information to help you about your problems with C, C++ and Java. About the message you get when you add “vpl_execution” file and not getting it by compilation, you must notice then that the file take the format of a shell script and you must add “#!/bin/sh” as the first line and you need to add “chmod +x vpl_execution” in your “vpl_run.sh” to set it as executable.
Best regards.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, October 25, 2010, 2:24 PM

Hello Andrey,
Your problem seems to be that you have set a too low memory size limit. You must increase the memory size limit to16MB or a higher value in order to run g++ and compile a C++ program.
Best regards

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Re: New Virtual Programming Lab (VPL) module

by Дмитрий я - Tuesday, October 26, 2010, 12:15 AM

Does VPL programming language FreePascal?

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Tuesday, October 26, 2010, 2:58 AM

The applet editor and the module supports syntax highlighting for Pascal, I don’t know the differences with FreePascal. The virtual machine with preconfigured Jail-system that you can download at VPL home page don’t have the FreePascal compiler installed but you can install it:
At the virtual machine execute
wget ftp://ftp.freepascal.org/pub/fpc/dist/2.2.4/i386-linux/rpm/fpc-2.2.4-1.i386.rpm
rpm –i fpc-2.2.4-1.i386.rpm
The last FreePascal version (2.4.0) has a “dependence not resolved” problem in the VM with Centos 5.

Best regards

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Re: New Virtual Programming Lab (VPL) module

by Andrey Semenyuk - Saturday, October 30, 2010, 12:08 AM

Thanks for helping me configure the VPL. It works great now!

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Re: New Virtual Programming Lab (VPL) module

by OEE_Dev KW_Univ - Sunday, November 21, 2010, 1:13 AM

Is it possible to run VPL with moodle 1.7 and moodle 1.8 release ??

If NO, How can I make it run with moodle 1.7 release or Moodle 1.8 ?

Please help,

Thanks

Omer.

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Monday, November 22, 2010, 11:12 PM

Dear Omer,
Sorry, but we are not planning to release a VPL version compatible with Moodle 1.7 or 1.8. We are planning, in a near future, to release a VPL version for Moodle 2.0.

Best regards

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Re: New Virtual Programming Lab (VPL) module

by Oleg Sychev - Wednesday, November 24, 2010, 11:10 PM

Hi. We in Volgograd State Technical University are looking for a way to integrate automatic program testing with Moodle server (thought we are using individual tasks for each assignment) and it is good to see work in the same way. Is there a way in VPL to configure module instance (from user interface) to automatically link student's program with some teacher-supplied library(s)? Or choose compile/run script from a number of existing ones. It couldn't be done in one script since some assignments require one special library, some - another and some no at all. (Of course, it would be better if code for such library could be uploaded by web interface, but not strictly necessary).

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, November 26, 2010, 7:48 PM

Hello Oleg,

The use of automatic program testing is one of the main target of VPL. The libraries can be used in two ways: as source code files of a VPL's activity, (they must be added in the “execution files” configuration page , better in a VPL activity shared as “based on”), or as software installed in every jail-servers you use.

To use one assignment for different tasks you can use “Variations”. The variations define sets of different requirements for an assignment. Each student will be randomly assigned a variation. Each variation has an identification code and a description. The variation description is shown to the students with the assignment description. The identification code is reported in the vpl_enviroment.sh , so it can be used in the script files (vpl_execution.sh, vpl_evaluation.sh) to do different actions depending on it.

Another way to control different task for one assignment may be to write a complex script able to detect the type of assignment submitted by checking , by example,the file names submitted by the student.

Best regards.

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Re: New Virtual Programming Lab (VPL) module

by Osvaldo Carvalho - Thursday, October 10, 2013, 1:52 AM

Hi, Juan,

How tests are specified when variants are used?

Best regards,

Osvaldo

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Re: New Virtual Programming Lab (VPL) module

by Juan Carlos Rodríguez-del-Pino - Friday, October 11, 2013, 2:45 AM

At this moment the variations are not covered by the default evaluation program.
We use it in specific assessment programs that allow different assigning to each student.
The assigned variation to each student is sent to the evaluation process as a environment variable. The variable is named as $VPL_VARIATION0 and its value is the variation id. This environment variable is set in the vpl_enviroment.sh file.
If the users of VPL want to use variations with the default evaluation program then it could be incorporated into future versions of this program.
Best regards.
Juan Carlos Rodríguez

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Virtual Programming Lab (VPL), version 1.3 released

by Juan Carlos Rodríguez-del-Pino - Tuesday, January 11, 2011, 9:02 PM

The VPL development team announces the public release of VPL 1.3, the third stable version of VPL. This new release adds some improve and fixes errors.

Added a new type of activity "example" used to show programs running.
Files from "Requested files" and "Execution files" can be downloaded as a ZIP file.
It uses the new 1.0.3 ACodeEditor version that adds a workaround for a Java 6.0_22 error.
Added Ubuntu support for the jail system (scripts to install and service)
Fixed Jail system connectivity error that avoid interactive execution if the server is behind a NAT

This version is backward compatible with VPL versions 1.x < 1.3. The upgrade from older version adds a new field to the database. It is recommended to upgrade to this new version.

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Re: Virtual Programming Lab (VPL), version 1.3 released

by Eamon Costello - Tuesday, March 15, 2011, 10:15 PM

Congratulations Juan. Looks very interesting though I have not installed it to look properly yet.

A short video would be great to go with the screenshoots to give people a flavour. Any plans to add PHP?

- Eamon

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Re: Virtual Programming Lab (VPL), version 1.3 released

by Juan Carlos Rodríguez-del-Pino - Wednesday, March 16, 2011, 7:46 PM

Thank Eamon,
if you have some question about the installation don't hesitate to ask me.
To make screencasts about the installation and configuration of VPL activities is in my TODO list.
The system can handle almost any programming language that use console iteration. The system don't highlight the sintax of PHP but can edit and run PHP. After your question I have added a PHP generic activity to the demo site
http://demovpl.dis.ulpgc.es/moodle
We are planning, for a near future, to add sintax highlighting for a wide variety of programming languages.

The "vpl_run.sh" used at the PHP generic activity is
-------------------------
1 #!/bin/bash
2 echo "#!/bin/bash" > vpl_execution
3 cat vpl_environment.sh >> vpl_execution
4 echo "php5 -n -f \$VPL_SUBFILE0" >> vpl_execution
5 chmod +x vpl_execution

-------------------------

Best regards
Juan Carlos

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Re: Virtual Programming Lab (VPL), version 1.3 released

by udara weerakoon - Friday, May 27, 2011, 5:51 AM

Dear Juan,

I have tried to install VPL 1.3 with moolde 1.9, but when I was running a C program in the activitiy (moodle), I got the message stating "not executed". I am using my test server (Ubuntu server 10) to run both moodle and jail servers. Here I'm attaching the log file. There are two question I am particular about.

1. what should I do with *.sh files, where should I create those?

2. What is the purpose of ACodeEditor? how can i use it?

I really appreciate your helping me.

Thank you.

messages.txt

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Re: Virtual Programming Lab (VPL), version 1.3 released

by Juan Carlos Rodríguez-del-Pino - Saturday, May 28, 2011, 9:11 PM

Dear Udara,
I’ll try to respond to your questions but not in the order you ask them.
==========
Question 1)
what should I do with *.sh files, where should I create those?
Answer 1)
There are three types of execution you can set for an activity: “run”, “debug” and “evaluate”. The “run” and “debug” actions do an online execution in a console (the console is part of the applet editor). The “evaluate” action does an offline execution and its output is saved as part of the submission.
Each action (“run”, “debug” and “evaluate”) has its own script: vpl_run.sh, vpl_debug.sh and vpl_evalaute.sh. The goal of these scripts is generate a file named “vpl_execution”. This file must be a binary executable or a script and if it exists, after running the action script, it will be run.
You may set your script files (vpl_run.sh, vpl_debug.sh and vpl_evalaute.sh) by “updating” your VPL activity and then selecting “execution”. You can't set scripts when you are creating a new VPL activity.
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Question 2)
I got the message stating "not executed"
Answer 2)
This message say that your script linked to the action you request do not generate a file “vpl_execution”.
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Question 3)
What is the purpose of ACodeEditor? how can i use it?
Answer 3)
Really, to run VPL you don’t need the source files of “ACodeEditor”, the applet code editor. The VPL module already has the “ACodeEditor” compiled. The source files of “ACodeEditor” are at the download page of the VPL site because it is Open Source as the rest of VPL.
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The log file you attach says that your Jail server is running OK, so far, but at your post you say that you are trying to run a C program and the file you use was “hello.java”.
To populate the script files, you can use the content I have suggested in other messages of the forum.

Best regards.

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Re: Virtual Programming Lab (VPL), version 1.3 released

by udara weerakoon - Saturday, May 28, 2011, 11:26 PM

Dear Juan,

I gotch you, Thank you so much.

I had to chop the log file due to the restricted file size of 100K. That is why the log file does not contain my hello.c program's execution logs.

Again, I really appreciate your helping me.

udara.

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unable to get vpl working in moodle 2.0

by saurabh singh - Wednesday, June 1, 2011, 8:53 PM

Hello juan,

I am intrested in working for development of vpl.But in order to even start that i need to get it working.My moodle installation is version 2.0,When i am trying to install the vpl plugin it's saying broken plugin....It appears that vpl is not supported by moodle 2.0?Can i get it working in version 2.0?

Secondly i am having problems in configuring the jail server in my ubuntu machine,the vpl-jail-system service runs fine,but the vpl-xmlrpc-jail isnt recognized by the shell.

(I know these questions are too dumb for a wanabe developer but i have tried everything)

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Re: unable to get vpl working in moodle 2.0

by Juan Carlos Rodríguez-del-Pino - Thursday, June 2, 2011, 12:38 AM

Hello Saurabh,

Sorry, but VPL 1.3 is NOT COMPATIBLE with Moodle 2.0. VPL 1.4 that is near to be released will neither be COMPATIBLE with Moodle 2.0 . After the release of VPL 1.4 we will start a 2.0 branch of VPL. We are planning to make a first 2.0 compatible release of VPL before the end of the year. If you are planning to develop new VPL features you must take this into account.

vpl-xmlrpc-jail is a deamon intended to be managed by xinetd.
Did you install xinetd?

Best regards.

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Re: unable to get vpl working in moodle 2.0

by saurabh singh - Friday, June 3, 2011, 10:08 AM

Yes xinetd is installed and is working..i can see it in the ps output.....

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Re: unable to get vpl working in moodle 2.0

by Juan Carlos Rodríguez-del-Pino - Monday, June 6, 2011, 10:30 PM

Dear Saurabh,

To help you installing a "Jail server" I need more information about “the vpl-xmlrpc-jail isnt recognized by the shell”.
To check your “Jail server” you can follow the steps I posted here on 17 September 2010.

Best regards.

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Re: unable to get vpl working in moodle 2.0

by saurabh singh - Monday, June 6, 2011, 11:55 PM

sudo service vpl-xmlrpc-jail start

unrecognized service

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Re: unable to get vpl working in moodle 2.0

by Juan Carlos Rodríguez-del-Pino - Tuesday, June 7, 2011, 1:35 AM

The message you get running “sudo service vpl-xmlrpc-jail start” is normal, vpl-xmlrpc-jail is a demon controlled by “xinetd”, you can’t use the command “service” to control vpl-xmlrpc-jail. The start/stop script of “vpl-jail-system” controls the activation/deactivation of “vpl-xmlrpc-jail”. If you want to control manually the “vpl-xmlrpc-jail” service you must edit “/etc/xinetd.d/“vpl-xmlrpc-jail”” and reload xinetd.

Best regards.

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Re: unable to get vpl working in moodle 2.0

by Marcello Missiroli - Friday, October 26, 2012, 1:57 PM

Some MORE dumb questions:

1) vpl-xmlrpc-jail is intended to be run on the Moodle host, or on the jail (VM) system?

2) When I install on Virtualbox the jail system provided, it seems that no port is open, espcially port 52000. What am I missing here?

3) When I install the vpl module in moodle, a testing Jail system URL is provided. How do I test it?

Thank you for the good work!

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Re: unable to get vpl working in moodle 2.0

by Juan Carlos Rodríguez-del-Pino - Friday, October 26, 2012, 8:49 PM

Hello Marcello,
I'll try to answer to your questions:
Q1) vpl-xmlrpc-jail is intended to be run on the Moodle host, or on the jail (VM) system?
A1) vpl-xmlrpc-jail is the daemon that manages the requests of execution received from a VPL module on Moodle server. vpl-xmlrpc-jail must be run on a jail system.

Q2) When I install on Virtualbox the jail system provided, it seems that no port is open, espcially port 52000. What am I missing here?
A2) I don't know. The vpl-xmlrpc-jail daemon is manage by xinetd and xinetd will open the appropriate/configured port

Q3) When I install the vpl module in moodle, a testing Jail system URL is provided. How do I test it?
A3) You can check the basic conectivity with the demo jail at Advanced settings->Check jail servers
You also can add any VPL activity and check to run some code in Test activity->Edit

Best regards

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Re: unable to get vpl working in moodle 2.0

by Marcello Missiroli - Saturday, November 3, 2012, 12:36 AM

I made progress, and I think I'm halfway through. Even like this the module it's very helpful, but I hope I can do more.

I installed the jail system in the VM, and at least sending the program works: I can see the output of the compiler on the rightmost window.

However, then the system hangs, and it reports that it cannot connect (I can see a dialogbox containing the printf output, so the program runs allright). So I suspect it's a firewall issue, but

a) I've already opened the ports on the main machine (this is the output)

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp -- anywhere             anywhere             tcp spts:51001:51500

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
piffy@moodle:~/VirtualBox VMs$

b) I've already activated the port forwarding on Virtualbox, as stated on the site.

So, I don't really know what to do next.

NOTICE: If/whenever I'm through with this, I promise I'll write a step-by-step, idiot-proof setup guide both in English and my language.

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Re: unable to get vpl working in moodle 2.0

by Juan Carlos Rodríguez-del-Pino - Saturday, November 3, 2012, 3:08 AM

If you can see the execution result in the error dialogbox, then you have a correct connection with the jail server. One question: are you running the browser in the same machine than the Moodle server? if the answer is yes then try acceding to your Moodle server from other machine.
Best regards

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Evaluation time and error

by ashok bhansali - Wednesday, September 30, 2015, 5:10 PM

Dear Juan,

Two ques :

1. My jail server was working fine but suddenly it's been become too slow.. by atleast 5 to 10 times. I've changed the jail server system with fresh installation but still same. What could be the probable reason and proposed solution ?

2. If i set the Memory to 32 or 64 MB in Maximum Execution resources limit then the same program some times work and sometimes goes out of Memory. I am unable to understand the reasons.. pls suggest what to do?

Regards

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Re: Evaluation time and error

by Juan Carlos Rodríguez-del-Pino - Thursday, October 1, 2015, 8:24 AM

Hello Ashok,
Two answers:
1) I have not heard about similar problem. I need more details about the problem to answer your question. You can do this to spot the problem:
a) when the system go slow login at the jail server and run top or ps to see wh

Virtual Programming Lab (plugin)

Archived posts, use them to search

Hello world test in C

Requested files

hello.c

Execution files

vpl_run.sh

vpl_debug.sh

vpl_evaluate.sh

vpl_evaluate.cases