Moodle in English: moodle with Auto Scalling group + elasticache on AWS

moodle with Auto Scalling group + elasticache on AWS

by Ignacio Vasconcello - Friday, June 26, 2020, 10:23 PM

Hello everyone, is my first time been here.

I'm looking for some information or experience implementing this kind of solution.

Is there a problem having a moodle's AMI in a auto scalling group? , require some aditionals configuration?

where's moodle storaged the information ?

I'm contempling an autoscalling group 1-1- 5, RDS-MariaDB, Elasticache (for sessions), I dont know if is necesary have an EFS for some files in commun, thinking about ASG is creating and terminating instances.

I apprciate your answers, bye

Re: moodle with Auto Scalling group + elasticache on AWS

by Michael Richardson - Wednesday, August 5, 2020, 4:16 AM

Hi Ignacio,
I have a Moodle 3.6 server running on EC2. I moved the RDS database from MySQL to MariaDB as per the advice here: https://docs.moodle.org/39/en/Server_cluster
I set up EFS as well. Our dataroot folder is about 130 GB and growing so this works well to have EFS store $CFG->dataroot, $CFG->tempdir and $CFG->cachedir all in a single EFS store (better speed the larger the store).
It ran quite slow during testing after installing EFS. I set up Redis on ElastiCache this improved performance a lot for most pages.
However I still have some pages that are really slow to load (over 60s):
1) Pages with SCORM files and
2) some course pages with lots of small (<100kb) images stored in the EFS.
So still trying to work it out but I'll let you know once I get some where.
Best, Michael

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Re: moodle with Auto Scalling group + elasticache on AWS

by Gregorio Merino - Wednesday, September 30, 2020, 8:40 PM

Hi Michael,

Perhaps you can help me setting up Redis as MUC and Session cache. I'm using Moodle 3.9 (latest version) and I'm trying just to add Redis cluster to Moodle site. When I do that, administration -> Caching page is giving me a timeout and I have to remove this entry from EFS shared drive mcu->config.php to make it available again.

I don't know if there is something related to ping() function into php to test Redis endpoint, but as you will know, you can't ping (ICMP) those endpoints.

Can give me some tips about how did you manage to add Redis Elasticache? I'm totally blocked...

Thanks in advanced

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Re: moodle with Auto Scalling group + elasticache on AWS

by Michael Richardson - Sunday, October 4, 2020, 4:26 PM

Hi Gregorio,

Do you have the php-redis module installed? Once this is installed you see a green checkmark in the 'ready' column next to Redis on the Cache Config screen.

Have you been following the instructions here? https://docs.moodle.org/39/en/Caching#The_cache_configuration_screen

Then click 'add instance' and enter your endpoint address and a logical name for the cache store.

Then at the very bottom of the cache configuration screen click 'edit mappings' and chose to use the new store the appropriate cache.

Hope that helps.

Kind Regards,
Michael

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Hardware and performance

moodle with Auto Scalling group + elasticache on AWS