How to set maximum user processes in Linux ?
In this post, we will look how to set maximum user processes in linux.
I. Check current process limit.
user@server02:~> ulimit -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 2061701 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) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 2061701 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited user@server02:~> user@server02:~> ulimit -u 2061701 user@server02:~>
II. Set the processes limit temporarily
user@server02:~> ulimit -u 3061701 bash: ulimit: max user processes: cannot modify limit: Operation not permitted user@server02:~>
III. Setting the process limit permanently
[user@ngelinux001 saket]$ cat /etc/security/limits.conf # /etc/security/limits.conf # #Each line describes a limit for a user in the form: # # # #Where: # can be: # - an user name # - a group name, with @group syntax # - the wildcard *, for default entry # - the wildcard %, can be also used with %group syntax, # for maxlogin limit # # can have the two values: # - "soft" for enforcing the soft limits # - "hard" for enforcing hard limits # # can be one of the following: # - core - limits the core file size (KB) # - data - max data size (KB) # - fsize - maximum filesize (KB) # - memlock - max locked-in-memory address space (KB) # - nofile - max number of open files # - rss - max resident set size (KB) # - stack - max stack size (KB) # - cpu - max CPU time (MIN) # - nproc - max number of processes # - as - address space limit (KB) # - maxlogins - max number of logins for this user # - maxsyslogins - max number of logins on the system # - priority - the priority to run user process with # - locks - max number of file locks the user can hold # - sigpending - max number of pending signals # - msgqueue - max memory used by POSIX message queues (bytes) # - nice - max nice priority allowed to raise to values: [-20, 19] # - rtprio - max realtime priority # # # #* soft core 0 #* hard rss 10000 #@student hard nproc 20 #@faculty soft nproc 20 #@faculty hard nproc 50 #ftp hard nproc 0 #@student - maxlogins 4 @user soft nproc 4096000 # End of file [user@ngelinux001 saket]$
After this we need to restart our session for the settings to take effect.