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I have a Linode vps that I use to host some of my websites on.

It's Ubuntu based and it's up to date in terms of all packages.

I don't have any cron jobs scheduled or any automatic processes.

I host a few (up to date) wordpress blogs there that have very little traffic altogether.

Every day (at a different time) my server stops responding, I can't SSH to it, web access is getting timed out and it just dies until I reboot it through the Linode manager.

On the linode dashboard I can see that the CPU is not very high (2-3%) Incoming/Outgoing traffic is on 0 and the IO count has a spike just before the server stops responding (SWAP IO is at 2k and IO Rate is at 5k).

When I reboot the server everything is just fine.

I'm trying to figure out a way to analyze what's going on at these random times where the server freezes up.

How can I determine the problem?

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Maybe /var/log contains some hints? Read carefully every log, checking for errors. –  S19N Sep 26 '12 at 12:07
    
If they're using VMware to run your VPS, install tools. I had same problem in an enterprise environment. –  GioMac Sep 26 '12 at 13:54
    
/var/log/messages and sar logs are the first to check. If you don't get any logs, next step is to set up a serial console so that logs will come to that when the system doesn't respond. –  Soham Chakraborty Sep 26 '12 at 15:24
    
Maybe you should also consider contacting linode when you don't find anything useful in the logs. –  Christopher Perrin Sep 26 '12 at 15:50
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