See how to set ulimits quickly on Linux server for whole system and for individual user.
In this post, we will see how to set ulimits globally on the system and in case we want to set it user-wise.
Lets see it step by step.
1. Check current ulimit set on the system.
[root@ngelinux001 saket]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 30385 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 100000 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited [root@ngelinux001 saket]#
2. Change ulimit temporarily in current shell.
root@ngelinux002 ~]# ulimit -n 16384 [root@ngelinux002 ~]# ulimit -n 16384 [root@ngelinux002 ~]# ulimit -u 8192 [root@ngelinux002 ~]# ulimit -u 8192
3. Put the settings in /etc/profile to set after every reboot.
root@ngelinux002 ~]# tail -5 /etc/profile unset -f pathmunge ulimit -n 16384 ulimit -u 8192 [root@ngelinux002 ~]#
4. Define limits in /etc/security/limits.conf file to change system defaults.
[root@ngelinux002 ~]# tail /etc/security/limits.conf #ftp hard nproc 0 #@student - maxlogins 4 * soft nproc 8192 * hard nproc 8192 * soft nofile 16384 * hard nofile 16384 # End of file [root@ngelinux002 ~]#
4. Check the limit again after reboot.
[root@ngelinux002 ~]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 4125961 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 16384 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 8192 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited [root@ngelinux002 ~]#
5. To set this for a specific user.
Set these parameters inside .profile file.
$ cat .profile ulimit -n 16384 ulimit -u 8192