I have a Ubuntu 14.04 VPS (1cpu, 512MB ram, swap 1024MB) with Apache, mySQL, sendmail and sshd, sometime it freeze, I can't access neither through ssh nor with VNC provided by the vps provider, the only choice i have is to reboot. There are no usefull logs to understand why the vps was stalled except sendmail reporting a load average above ten. I'm guessing the overload is from apache or mysql even if my site at the moment is serving 10-20 clients per day. Which steps should I follow to isolate the problem and get a clue of what is going on randomly on my server?
How do I diagnose why a VPS is freezing?
ubuntu;syslog;freeze;vps