Re: [Xen-users] Spontaneous reboots stock Xen 4.4 on Debian Jessie

[Andreas Pflug <pgadmin@xxxxxxxxxxxxxxxxx>]

Am 06.07.16 um 10:20 schrieb George Dunlap:
> On Tue, Jul 5, 2016 at 3:53 AM, Jan Bakuwel <jan.bakuwel@xxxxxxxxx> wrote:
>> Hi George,
>>
>> On 05/07/16 00:00, George Dunlap wrote:
>>> On Sun, Jul 3, 2016 at 10:37 PM, Jan Bakuwel <jan.bakuwel@xxxxxxxxx> wrote:
>>>> Hi there,
>>>>
>>>> I have two Dell T420's, 32GB, RAID6 array, running an up-to-date Debian
>>>> Jessie stock with stock drbd, lvm and Xen (4.4) running a number of
>>>> Windows and Linux guest VMs. Everything works fine ... until the server
>>>> spontaneously reboots. Nothing in the xen logs, nor in syslog, as if
>>>> someone pressed the reset button.
>>>>
>>>> Any suggestions where I should start digging?
>>> Have you got a serial console hooked up?
>>>
>>> http://wiki.xenproject.org/wiki/Xen_Serial_Console
>> I have remote access to the console as the server has a management
>> interface (iDRAC).
>>
>>> For these kinds of reboots, catching it in the act is usually the only
>>> way to figure out what was going on; and having the output of a serial
>>> console is the most reliable way to catch the output as it died.
>> That's the difficult part as initially it's all running smoothly.
>> Wouldn't anything on the console not also end up in a log file though?
> In case of a spontaneous reboot, almost never. A reboot only happens
> when some drastic unrecoverable error occurs; and in that case,
> there's never enough time to actually write out the data to disk.
I'd suggest configuring netconsole to log kernel messages to a rsyslog
server. You might get right-before-dying messages from the kernel that
wouldn 't get a chance to go to kern.log before reboot.


Regards
Andreas

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