Re: DMESG question

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02-18-2008, 06:07 AM

Alexander Hall

Posts: n/a

Re: DMESG question

Gabriel George POPA wrote:
> I have two small questions:
> 1) When the OS generates too much messages, old messages are lost
> (oldest lines present in `dmesg` are lost).

`dmesg' displays the system message buffer, which has a limited space.
Therefore, when it is full, it starts overwriting itself. Thus, lost
messages are indeed lost.

> What can I do to see ALL messages ever recorded for dmesg printing?

You could write some script that `dmesg > /some/where/$time`
periodically (cron job).

> More precisely, take a look at my `dmesg`:
> # dmesg
> arp info overwritten for 193.231.39.129 by 00:90:bf:10:88:40 on vr0
> arp info overwritten for 193.231.39.129 by 00:10:dc:4c:6f:6c on vr0
> arp info overwritten for 193.231.39.36 by 00:15:f2:16:f8:b4 on vr0
> arp info overwritten for 193.231.39.54 by 00:e0:29:9b:bc:6c on vr0
> ...
> (and a lot of other similar messages, similar if not even identical)
>
> Most questions on this mail list require me to provide a valid output of
> dmesg. But if old messages are erased, how am I
> supposed to do this?

$ cat /var/run/dmesg.boot

> I am not allowed to reboot the machine! The machine
> is supposed to be running 24/7, NO reboot allowed.

Isn't this machine ever upgraded? Or, if it is so important - what about
redundancy? Well well.

> 2) What do these lines mean (the lines I copied above from the output of
> `dmesg`)?

I'd say some machines are fighting over the same ip address. I could be
wrong, though. Don know, but I get a feeling that some failover
solution(s) could cause this.

/Alexander

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Re: DMESG question