We are having an issue with a VPS running plesk 9.5 on ubuntu 8.04 At seemingly random intervals Apache will disappear and needs to be started manually. I have checked the apache error log, /var/log/messages, individual virtual host apache error files and cannot find anything that coincides with the time of the failure. dmesg is empty which is a bit odd.

We have also had the psa service go down for no apparent reason but apache stay up.

I'm at a loss to diagnose this really because all the log files I can find do not point to any issues. Are there any others I can look at?

Memory usage sits at about 55% (out of 400mb) and it isn't a particularly high trafficed server.

Any pointers as to where else I can find out what is going on would be very much appreciated.

Nick