Once in a while (maybe once a day?) I've got a load average of 10. That lasts for like 30 min (where I can't reach any of websites on this server) and then it's fine again.
I just happened to be via SSH on the server and did a htop.
It's mostly php-fpm: pool www
and /user/sbin/mysqld
processes.
I've got Debian: Linux r3cwzg4q 2.6.32-042stab104.1
and up to date versions of PHP, Nginx, Mysql and all web apps.
In total running 17 webs with very little traffic (0 - 200 visitors a day - mostly in the 0 - 50 area, only one web with 200).
It's a VPS, 5GB memory, 4 cores - normal load is around 0.3.
Is there a way to debug which web is causing this load?
Or if it doesn't come from a website, where would it come from?
(cron backup jobs only at night, not right now)