before you start investigating, I’d recommend to upgrade your ownCloud to the latest version, since you are still using 10.0. Especially, but not only, in 10.4 there were several improvements regarding background jobs (ie cron) memory consumption. (Search https://owncloud.com/changelog/server/ for ‘memory’)
If, after having upgraded, you still experience the OOM issue please provide a list of enabled apps and the owncloud.log around the timestamp when the OOM occured.
Hello!
Updated to 10.6.0 on your recommendation.
The update was successful with no errors.
Now the problem is in cron.php - not starting on the page (Last executed scheduler task: 15 hours ago. Looks like something is wrong.)
Should run every 15 minutes.
How can I fix this?
So replace your line with */15 * * * * /usr/bin/php -f /var/www/html/owncloud/occ system:cron
In general, when something is not working as expected have a look into owncloud.log. I’m pretty sure there is an error complaining about the command syntax.