View source for Enable Apache to Create Core Dumps

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==Configure Apache for core dump on Segmentation Faults==

While trying to debug a 500 error the other day, I noticed that it was giving me a Segmentation fault.

> 26619 15:44:43 --- SIGSEGV (Segmentation fault) @ 0 (0) ---

To get rid of this problem I was asked to configure a Linux system so that Apache can dump core files on segmentation faults.

===Enable Apache Core Dump===

Now Apache does support the CoreDumpDirectory directive, so our first stop is adding this to httpd.conf file.

Open httpd.conf

 vim /etc/httpd/conf/httpd.conf

Add the following line to the Main Configuration Section:
 CoreDumpDirectory /tmp/core-dump

Now lets create this directory if its not already there

 mkdir -p /tmp/core-dump

Set permissions on the folder so Apache can write to it.

 chmod 0777 /tmp/core-dump

You will also want to add the following to your Apache init script

 vim /etc/init.d/httpd

Add the following to the top of the script
 ulimit -c unlimited

If you do not plan to leave core dumps enabled you can just type

 ulimit -c unlimited

To verify that -c core variable is set correctly just type:

 ulimit -a

To show you all the ulimit variables.

Now we just need to restart Apache web server:
 /etc/init.d/httpd restart

How do I read the core dump files created by Apache on Linux systems?

===How to read the Apache web server core dumps ===

Well I am not a developer but they are using gdb and other techniques to analyses the core dumps. Read man page of gdb for more information.

 gdb apache2 –core /tmp/core-dump/corefile

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