Re: How to limit the total size used by core files or automatically delete old corefiles.

Andrzej Kardas <andrzej-kardas@xxxxx> · Thu, 26 May 2011 18:05:20 +0200



    On 26.05.2011 14:31, SADA SIVA REDDY S wrote:
    My Questions:

      
        Is there a provision in Linux to automatically cleanup the
          old corefiles when we reach a certain limit ? 

        
    I  think there is no such feature. Core dump is regular file saved
    in default process directory, and system doesn't trace these files,
    it simply generates core dump and forget about it (on other words,
    system treats core dumps as regular file and doesn't know that is a
    core dump file).

    
        Is there a provision in Linux to set a upper limit for space
          occupied by all core files (not individual core files) ?
      
    
    I think no, you can limit size of generated core dump per file, per
    user (ulimit -c).

    
    But, you can change destination of all core dump files by add line 

    
    kernel.core_pattern = /vol/allcoredumps/%u/%e
    

    in /etc/sysctl.conf

    
    After that, you can write a simple script to check amount of free
    space, schedule it into crontab. When free space will be below
    certain limit, script should remove oldest or biggest files from
    above location.

    
    Below, list of available patterns:

    
      %p: pid

      %: '%' is dropped

      %%: output one '%'

      %u: uid

      %g: gid

      %s: signal number

      %t: UNIX time of dump

      %h: hostname

      %e: executable filename

      %: both are dropped

    
    --
regards
Andrzej Kardas
http://www.linux.mynotes.pl


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