Nextcloud brought down my entire server in a way that even the mouse in the physical machine refused to move.
Configuration:
- Nextcloud 21 on stock Debian Buster (php 7.3)
- running in LXD Linux Container on a Ubuntu 20.04 server
- ACPu configured
Observed:
-
every 10 min - when the cron.php runs - memory consumption and CPU on one processor surged and a couple of seconds later, the machine froze. Sometimes it thawed a couple of seconds later, sometimes not.
-
Though the machine has 32G of RAM it got exhausted by the cron.php job
-
limiting the memory for php cli caused cron.php to crash:
www-data@nextcloud-lxd:~/nextcloud$ php -f /var/www/nextcloud/cron.php PHP Fatal error: Allowed memory size of 17179869184 bytes exhausted (tried to allocate 20480 bytes) in /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php on line 133 -
Disabling ACUp brought help but slowed Nextcloud down
Solution:
Add the following line to /etc/php/7.3/mods_available/apcu.ini
apc.enable_cli=1
That did the job and both Nextcloud and the server run smoothly
PS: wisdom from here: [NC 21] OCC Update error: allowed memory size exhausted · Issue #25742 · nextcloud/server · GitHub