Re: How to get a core dump

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On Fri, Nov 05, 2004 at 01:38:44PM +0100, Marc Gracia wrote:
> So, my question is... There is any way to force apache to dump a
> coredump file? I suppose I'm forgotting something but I really
> desperate...

On Linux, create a directory that is writable by the httpd user
  mkdir /var/tmp/apache-cores
  chown httpd /var/tmp/apache-cores
  chmod 700 /var/tmp/apache-cores

Set the dump directory in httpd.conf:
  CoreDumpDirectory /var/tmp/apache-cores

Enable core dumps in your shell and then start Apache
  ulimit -c unlimited        (for bash; different for csh)
  /usr/local/apache/httpd


To test that you can get a dump, start up an httpd process,
send a SIGABRT, SIGBUS, or SIGSEGV to one of the _children_,
and check that it dumped.  The error log should indicate
that a possible dump was saved to /var/tmp/apache-cores.
   kill -11 <apache_child_pid>

('kill -l' (that's a lowercase letter L) to get a list
 of signals and their numbers for your system)


Of course, this will all be a lot more useful to you if you
build Apache with debugging enabled.  When building, set
OPTIM=-g before './configure' in the Apache source dir, e.g.
  OPTIM=-g ./configure ...
or before 'perl Makefile.PL' in the mod_perl source dir, e.g.
  OPTIM=-g perl Makefile.PL ...
depending on how you build Apache and mod_perl.

Cheers,
Glenn

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