Linux - How to enable core dumps for processes, Linux create core dumps for processes

How to enable core dumps for processes

How to create core dumps for processes on Linux Operating System?
Core dumps can be enabled or disabled in linux operating system by using below techniques. There is a default entry as below in /etc/profile to disable core dumps. To enable the core dumps you have to modify the given line as below.
 # vi /etc/profile  
Default entry to disable core dump is
  ulimit -S -c 0 > /dev/null 2>&1
Replace the above line with this line to enable core dump:
  ulimit -c unlimited >/dev/null 2>&1

Another way to enable this globally is by editing the /etc/sysconfig/init file and add this line:

To enable core file for user in his own .bash_profile add this line:
  ulimit -c 50000
This allow core files but limit them to 50,000 bytes.

Changes to ulimit settings do not affect daemon processes which are already running, so you need to restart any services for which you want to enable core dumps. Alternatively, you can reboot the system to have the new settings take effect for all daemons.

By default, core dumps are not generated by programs that are running setuid to prevent sensitive information being leaked.
To enable core dumps for setuid programs, run this command:
 # echo 2 > /proc/sys/fs/suid_dumpable

To make this setting permanent:
 # vi /etc/sysctl.conf

   fs.suid_dumpable = 2
   kernel.core_pattern = /tmp/core

kernel.core_pattern is used to control the location and name of the core file.

Then reload the settings in /etc/sysctl.conf:
  # sysctl -p
When the daemon terminates abnormally, a core file should appear in the configured location ie /tmp.

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