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Article Reference

Article ID: 3652
Last update: 06-17-08
Issue:
How do I configure a Red Hat Enterprise Linux system so that Apache can dump core files on segmentation faults?
Resolution:
  1. Within the main Apache configuration file /etc/httpd/conf/httpd.conf add line at bottom of file: 

     
CoreDumpDirectory /var/apache-dump


  2. Create a new /var/apache-dump directory and correctly set ownership and permissions on directory: 

      
# ps aux | grep http | tail -n 2
# mkdir /var/apache-dump
# chown apache.apache /var/apache-dump     

   NOTE: Change apache.apache to the username shown on 
         the ps output for your system.

# chmod 0770 /var/apache-dump
# ls -ld /var/apache-dump
drwxrwx---    2 apache   apache   4096 Aug 16 10:59 /var/apache-dump


  3. Edit the file /etc/security/limits.conf and add line: 

      
*               -       core    unlimited


  4. Edit the file /etc/profile and change line : 

      
ulimit -S -c 0 > /dev/null 2>1

    to: 

     
ulimit -S -c unlimited > /dev/null 2>1


  5. Edit the file /etc/init.d/functions and place a "#" in front of line: 

     
        ulimit -S -c 0 >/dev/null 2>1

    to: 

     
        #ulimit -S -c 0 >/dev/null 2>1


  6. Edit the file /etc/init.d/httpd and add a ulimit -c unlimited statement at the top of the start() section: 

     
start() {
        ulimit -c unlimited
        echo -n $"Starting $prog: "


  7. Enable writing the PID to the core file after reboots (if this is an Enterprise Linux 3 server, enable setuid_ok as well), edit the /etc/sysctl.conf file and add : 

      
kernel.core_uses_pid = 1
# Following needed for Enterprise Linux 3 servers
kernel.core_setuid_ok = 1


    Also, echo this value into proc with the following command in order for this configuration change to take effect immediately: 

     
# echo 1 > /proc/sys/kernel/core_uses_pid
# echo 1 > /proc/sys/kernel/core_setuid_ok


  8. Reboot or restart apache 
    service httpd restart
  9. To test, use ps aux to list any Apache process and then kill -11 <PID> - then check the /var/apache-dump/ directory for new core file. 

     
# ps aux | grep htt | tail -n 2
apache    1331  0.0  2.6 80152 6776 ?        S    13:59   0:00 /usr/sbin/httpd -
apache    1333  0.0  2.6 80152 6776 ?        S    13:59   0:00 /usr/sbin/httpd -
# kill -11 1333
# ls -ld /var/apache-dump/core.1333
-rw-------    1 apache   apache   71188480 Aug 16 13:48 /var/apache-dump/core.1333


Once you have a core file from Apache, you can use the information from other knowledgebase articles to read the core files created by Apache on Red Hat Enterprise Linux systems.


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