Moodle version: 3.3.1+ (Build: 20170824)
Apache 2.4.16 / PHP 7.0.7 / Postgres 9.6.4
Load balanced over 8 servers plus 1 cron specific server
We recently made a few changes to our moodle infrastructure (upgraded moodle from 3.1 to 3.3, php from 5.4 to 7.0 and moved moodle sessions into memcached) and we've encountered a new problem.
When a user runs something in the web interface that takes some time - backing up a large course that takes around 4-5minutes to complete, moodle logs out whilst this goes on. I can replicate it 100% of the time. I have switched between having multiple memcached servers hosting the session cache to 1 server and it's not made a difference.
I'm interested if anyone knows anything about this issue, or if there are any suggested fixes.