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  1. #1

    Exclamation Linux server crashes at random intervals

    Hi there,

    Me and my friends have a linux CentOS server running. We use this server to run our minecraft server on. We are now using this server for about a week. But at random intervals (2hours-2days) the server suddenly crashes. I have tested to run the minecraft server at my personal computer, but that did not give any results. Note that the actual hardware server is down, with that taking our minecraft server also down. I have to reset the server by using a 'automated hardware restart' in the host company their website (Hetzner).

    The messages file says the following:

    Anyone any idea what the problem could be?
    Thank you for reading my post, plz help!

  2. #2
    Just Joined!
    Join Date
    Sep 2007
    Silver Spring, MD

    Items to review

    1st - I think the first thing you want to do is to capture the logs.

    2nd - Run the command kdump - Collecting and analyzing Linux kernel crashes - Kdump

    3rd - Next, evaluate all of the items on the system from a hardware standpoint (from memory, hard-drive, cpu, network cards, make sure that everything has been seated

    4th - Check the crontab or cron jobs to view if there is something being loaded there.

    5th - Run top command to see what is running on the machine

    6th - Run lsof -iTCP -P -s - Identify network processes

    7th - Disconnect the system from the network and verify if there is an outside connection affecting the system

    8th - Identify any errand processes (ps -ef)

    9th - Stop any processes that are not essential to the system- chkconfig --level 345 <proc> off, once you do that, you should be able to normalize the system.

    10th - If it has been identified as being a virus or malware, then run download avg -


  3. #3
    Linux Newbie user-f11's Avatar
    Join Date
    Feb 2011
    Sofia, BG
    Quote Originally Posted by koxien2 View Post
    But at random intervals (2hours-2days) the server suddenly crashes.
    If you have external power supply with prtection circuit breaker it may switch off ... as a result of fluctuations in the power supply grid or as a result of overheating of the CPU. The server is a conventional electronic device and like all electronic devices works within special temperature range, humidity, degree of contamination, etc.
    1. Keep the temperature in the premise where the server is within the specified by the OEM temperature range.
    2. Try to improve the ventilation of the server ... & of the working premise.
    3. You may try also to replace the air-cooling of the CPU with water cooling.
    4. Reduce the clock of the processor (if this option is available)
    5. Make a survey of the motherboard - with a magnifying glass. Watch for cracks on the bus rails, carbonification of chips (as a result of overheating), short-circuits from contamination with dirt, etc.
    6. Clean up the motherboard.
    For further details of how to do this see: How to Clean a Motherboard | Cleaning Guides

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  5. #4
    I am thinking that the problem lies in the MTRR cleaner. There are numerous lines in the log you posted that shows the kernel trying to find the most optimal configuration (for example: gran_size: 2G chunk_size: 2G num_reg: 4 lose cover RAM: 1950M)

    You could try to manually tune MTRR by adding the following to the boot parameters:
    mtrr_gran_size=16M mtrr_chunk_size128M
    It is worth giving that a try and see if you notice any difference in stability. Other than that, nothing really stands out (to me) in your logs. Let us know if this helped =)

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