linux system logs
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Thread: linux system logs

  1. #1
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    linux system logs

    Hi, not too familiar with linux from a sysadmin point of view. We have a box (RH 3.0) that regularly crashes around once a month, I can't see anything database/application wise but the sysadmin can't see anything their end either.

    Anyone know any system logs I can look at etc?

    Bazza

  2. #2
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    /var/log/messages

    but if it crashes, might not be anythign there

  3. #3
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    Thanks davey, but you were right, nothing of value in there.

    Hmm...back to the drawing board.

    Bazza

  4. #4
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    Isn't it /var/adm/messages?

    You could also try searching for core files which might be produced when the system crashes, and use strings or similar to try to discover what caused the problem:

    find / -name core - to find any core files.

    strings /path/to/core | pg - to read any readable text in the core file.

    Hope this helps.
    If I have to choose between two evils, I always like to choose the one I haven't tried yet.

  5. #5
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    Quote Originally Posted by KenCunningham
    Isn't it /var/adm/messages?
    .
    nope, redhat is definitely /var/log/messages

  6. #6
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    Righto, ta!
    If I have to choose between two evils, I always like to choose the one I haven't tried yet.

  7. #7
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    Thanks Ken, I'll give that a whirl.

    I have spotted something odd, Grid Control thinks OPEN_MAX has changed from 1024 to 65536, then to 1024 and then back to 65536 over a period of 3 weeks. The changes tie in with reboots/crashes but sysadmin don't know what causing this and didn't do anything. Yet if i do a getconf OPEN_MAX it returns 1024. It may just be a problem/bug with grid and yes I'm clutching at straws!

    We run 3 databases, a couple of agents and grid on this box. We also see the same pattern on the DR server (and that also has the mysterious, ostensibly changing open_max value).

    Bazza

  8. #8
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    Define crashes? we have servers that under high load 'freeze' and the ilo tools automatically reboot it after 5 mins. Slightly different to a crash

    (all caused by unfixed redhat bugs)

  9. #9
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    crash in the sense you can no longer connect to the box or even do a simple ping. Everytime its happened, its been a case of powering the box on directly. The DR server was down for a matter of hours last time it happened on there.

    No core dumps.

    Redhat bugs...perhaps thats where I should look next.

    Bazza

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