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On my server with Ubuntu 11.04 I run a web server and an irssi session within screen.

The server freezes after a while. When I try to access its web pages, it only says "Loading" before it timeouts. When trying to connect through SSH I get no response followed by a timeout.

However, ping is responding and the auto-op feature on irssi still works.

A reboot is the only way I have found that solves it.

What could be the problem? How can I log the performance and status of the system to get more info on what is going wrong?

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How do you reboot it after it stops responding? A hard reboot by cutting the power, or can you still access a terminal directly on the machine? – Daniel Andersson Apr 25 '12 at 9:46
Have you checked the system log? – mydoghasworms Apr 25 '12 at 9:54
Which system log do you exactly mean? I can hard reset it. Console is frozen too.. – Blaskovic Apr 25 '12 at 22:06
up vote 1 down vote accepted

What could be the problem?

I would attempt to log in to the console and see what processes were running.

I would look in syslog for error messages that might give a clue.

I would use tools like top to monitor the system after a restart (assuming the "freezes after a while" implies a predicable period of time).

There may be a hardware problem (e.g. memory) - so I'd consider running some hardware diagnostics.

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I haven't got physical access to that server. It's virtual server running at one company. (helpdesk didn't help = your virtual machine = your problem) So, let's try syslog and top.. But after a while is about 1-2 days ;) – Blaskovic Apr 25 '12 at 15:33
@Blaskovic: Apparently, some virtual hosting companies provide virtual console access through the web-based vhosting control-panel available to customers (they may refer to it as out-of-band console access) - I guess the helpdesk would have mentioned it though. – RedGrittyBrick Apr 25 '12 at 15:55
Yes, they have KVM (vnc). It's frozen too. – Blaskovic Apr 25 '12 at 22:07
Thank you. I found syslog. It's problem with procesor. It's not strong enough to handle it. – Blaskovic Apr 26 '12 at 15:10

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