Only software developers legitimately need to access core files and none of my production web server requires a core dump. How do I disable core dumps on Debian / CentOS / RHEL / Fedora Linux to save large amounts of disk space?
A core dump file is the memory image of an executable program when it was terminated by the operating system due to various error behavior.
Disable Core Dumps
To disable core dumps for all users, open /etc/security/limits.conf, enter:
# vi /etc/security/limits.conf
Make sure the following config directive exists:
* hard core 0
Save and close the file. Once a hard limit is set in /etc/security/limits.conf, the user cannot increase that limit within his own session. Add fs.suid_dumpable = 0 to /etc/sysctl.conf file:
# echo 'fs.suid_dumpable = 0' >> /etc/sysctl.conf --> core dumps disable
# echo 'fs.suid_dumpable = 1' >> /etc/sysctl.conf ---> core dumps able
# sysctl -p
This will make sure that core dumps can never be made by setuid programs. Finally, add the following to /etc/profile to set a soft limit to stop the creation of core dump files for all users (which is default and must be disabled):
# echo `ulimit -S -c 0 > /dev/null 2>&1` >> /etc/profile --> core dumps disable
# echo `ulimit -S -c 0 > /dev/null 2>&1` >> /etc/profile --> core dumps able
여기서 주의할 것은 "'"이 아니라 "`"으로 해 주면 profile파일에 제대로 찾아가 다음과 같이 안착한다.
# No core files by default
ulimit -S -c 1 > /dev/null 2>&1
위와 같은 문구가 보일 것이다. 그렇지 않고 "'"을 사용할 경우 PATH 부분 맨끝에
ulimit -S -c 1 > /dev/null 2>&1 이 줄만 보일 것이다.