This wiki show cases how to make sure your httpd generates Core Dumps on different platforms.

Generally there are two things to make sure:

The first is usually controlled by an Operating System facility which either globally or locally limits this ability.

The latter can either be controlled by the OS, or to a certain extend by the daemon. In Apache httpd we have CoreDumpDirectory is a hint to the daemon to chdir(2) to a directory where it can leave behind a core file.

This is, because daemons usually run in / where they do not have write permissions.

Linux

We can extend apachectl to enable coredumps by writing:

ulimit -c unlimited

Note that this is what controls core dump settings on a user/session base. For system wide settings see: /etc/security/limits.conf, respectively limits.conf(5).

To help with CoreDumpDirectory, see core(5) how generate a core_pattern, which you can set via:

sysctl -w kernel.core_pattern=/some/core/pattern

FreeBSD

Depending on the shell, we can either use ulimit -c unlimited if we're using sh(1), or, if we use csh(1):

limit coredumpsize unlimited

Note that this is what controls core dump settings on a user/session base. For system wide settings see: /etc/login.conf, respectively login.conf(5), or set the kernel.coredumps to 1:

sysctl kern.coredumps=1

To help with CoreDumpDirectory, see core(5) how generate a corefile which you can set via:

sysctl kern.corefile=/some/core/pattern

Solaris

Everything of the above can be controlled via coreadm(1M), see this How To for a comprehensive list of examples.

CoreDump (last edited 2011-03-22 19:02:57 by jmcg)