Moodle in English: No execution server available Not found http request URL path not found

Virtual Programming Lab (plugin)

No execution server available Not found http request URL path not found

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No execution server available Not found http request URL path not found

by crémos MOUSLI - Sunday, April 12, 2020, 11:40 PM

Hello !

I just installed the Virtual programming lab 3.3.6 plugin (2020040820) for moodle 3.7.4+

I have a problem with the VPL Jail System server (execution server):
To download this execution server, the official page is here and the documentation to install the execution server is there.
Our execution server: a Linux / Ubuntu 18.04.4 LTS machine with the usual languages (C, C ++, Perl, Python, R ...). It is a virtual machine provided via VmWare. On this execution server, we entered URLPATH = / moodle in the /etc/vpl/vpl-jail-system.conf file.

Through the server address http://jupyter.ac-amiens.fr/moodle (to verify that the server was accessible and active), we get the following error: “Not found Http GET: Url path not found' / moodle”

There is no apache or nginx server running in the server.
Verification of the port on the execution server (VPL Jail System version 2.5.3): it listens well on port 80 and 443
netstat -napl | grep vpl
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 18542 / vpl-jail-serv
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 18542 / vpl-jail-serv

Thank you in advance for your feedback.

Re: No execution server available Not found http request URL path not found

by Juan Carlos Rodríguez-del-Pino - Tuesday, April 14, 2020, 5:52 AM

Dear Crémos Mousli,
With the information that you report, indicate that the VPL Jail System is running and responding to HTTP requests.
Please check:
1) The setting at the /etc/vpl/vpl-jail-system.conf file needs to write parameters using a strict format "Parameter=Value" without spaces. You must use "URLPATH=/moodle"
2) You must restart the service "systemd restart vpl-jail-system" after a configuration change.

Important: you must update the VPL plugin to the 3.3.7 version due to a bug that prevents to run Java programs in the 3.3.6 version.

It is highly recommended to use https due to the web browsers are reluctant to allow using http connections from pages using https.

Best regards,
Juan Carlos.

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