I am about at my wits end trying to figure out why my dedicated web server is shutting itself down daily. sometimes two or three times a day. Server is using latest version of apache, centos 5.7 and latest update of cpanel/whm. There are no ontoward scripts running on it as this server has been only recently provisioned and I've only transferred in a few client accounts which had operated for years on the server I am phasing out. They're pretty simply web hosting accounts so nothing going on there.

The apache error log doesn't seem to reveal anything at all. I put in a ticket had cpanel look at this and they couldn't find anything.

there is no crash shown in last nor a reboot command seen it appears the server is being started from a powered off state.

So I had the NOC check all the hardware and they even replaced the power supply and heat sink even though they swear everything checked out fine.

I installed sys-snap to see if I can see anything after it reboots again. I don't find anything obvious.

But I am not an expert so maybe I am missing something here. The only thing that seems to happen repeatedly prior to the shutdown and that seemed to have started up about the time this problem began is:

ipaliases failed @ Tue Nov 15 17:43:30 2011. A restart was attempted automagically. Service Check Method: [check command] Number of Restart Attempts: 1 Cmd Service Check Raw Output: ipaliases has missing ips

I've researched on that and cannot find anything helpful.

So wondering if anyone here has any ideas, suggestions or anything else that might lead me to a solution. Appreciate the response.

probably won't help but I'd install/run collectl and see what the system was doing right before it shut down. Were there any network errors? CPU spikes? Disk I/O bursts? run out of memory? What processes were the most active at the time of the reboot?

If you think there was something unusual but not enough detail you could drop the stats monitoring interval to 1 sec and the process monitoring to 10 seconds.

just a thought...
-mark

Thanks for the suggestion. collectl might be helpful. But as far as I can see, nothing unusual at all is occurring just prior to shutdown. The server has virtually no load and plenty of memory.