Why and How to create a core dump file of crashed process ?

  Why ?

If a process got crashed then creating a crash dump files that is contains everything occur to analysis it to find the source cause of this issue, below is steps to create this dump files.

How ?

Below is steps to create a dump file for a specific process :

1- As a root user find and change directory to that process :

cd /path/of/process/fle

ps aux | grep process

2- To make sure parameter files allow any size of dump  :

prlimit --pid <PID process> --core=unlimited

3- To create the core dump file

gdb process <PID>

(gdb) generate-core-file

(gdb) detach

4- To create an analysis file of that core dump to read it as well

 python lib_extractor.py process /path/to/file/core.<PID process>