We have a new Centos 7 x64 Virtualmin server running on an AWS m3.medium instance. Memory has not been a problem. It has 4GB and we never see it go into swap, usually hovering around 1.9GB used.
Today I noticed all sites were down and the mysqld service stopped due to oom-killer.
I would be interested to know why this would happen? Is this something you've seen before? This server used to run on Centos5 for years on 4GB and this never happened once. I am regretting going to Centos 7 a bit now. Should we consider building a new Centos 6.5 server instead?
As I type this webmin was just oom-killed...