[CentOS] Diagnosing random hangs
John R Pierce
pierce at hogranch.com
Mon Dec 18 21:54:24 UTC 2006
Mark Belanger wrote:
> Matthew Miller wrote:
>> On Mon, Dec 18, 2006 at 04:17:59PM -0500, Mark Belanger wrote:
>>> I have many different centos machines that are hanging
>>> regulary. I believe this is due to something our application
>>> is doing - not a centos specific problem.
>>> When the machines hang, there is no access to the console
>>> or remote access(ssh, rsh, etc).
>>
>> Do you mean that there's no *access* to the console, or that it doesn't
>> *respond* on the console?
>
> X is frozen, no way to switch the console(i.e. Ctrl-Alt-F1,
> Ctrl-Alt-Backspace),
> and no way to access the machine remotely.
if you don't need X running, I'd stop loading it entirely (edit
/etc/inittab, and change the default runlevel to 3), and before your app
hangs, log onto the system console, and leave this command running as
root...
# tail -f /var/log/messages /var/log/secure
this way, any error logging will be displayed as the system crashes.
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