Ubuntu 16.04, Nginx Virtualmin GPL
Every 2 hours or so, I get a notification that MySql is down, and then all of the sites go down. All of the sites when accessed have the “Bad Gateway” page. When this happens, I also cannot access the Virtualmin Panel, and often cannot SSH in, forcing me to reboot from the VPS hosting panel. After I reboot, everything is fine for a couple of hours. I can’t find anything in logs, but perhaps I am looking in the wrong place.
I’ve had low resource problems before, but never like this. The only thing that changed before this started happening, is that I removed a bunch of old PHP versions.
What should I be looking at?