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proc limit

[host@user ~]$ ps --no-headers -Leo user | sort | uniq -c


* soft nproc 400
* hard nproc 200

To set ulimit value on a parameter use the below command.

# ulimit -p [new_value]

For the ulimits to persists across reboots we need to set the ulimit values in the configuration file /etc/security/limits.conf. Settings in /etc/security/limits.conf take the following form:

# vi /etc/security/limits.conf
#[domain]        [type]  [item]  [value]

*               -       core             [value]
*               -       data             [value]
*               -       priority         [value]
*               -       fsize            [value]
*               soft    sigpending       [value] eg:57344
*               hard    sigpending       [value] eg:57444
*               -       memlock          [value]
*               -       nofile           [value] eg:1024
*               -       msgqueue         [value] eg:819200
*               -       locks            [value]
*               soft    core             [value]
*               hard    nofile           [value]
@[group]        hard    nproc            [value]
[user]          soft    nproc            [value]
%[group]        hard    nproc            [value]
[user]          hard    nproc            [value]
@[group]        -       maxlogins        [value]
[user]          hard    cpu              [value]
[user]          soft    cpu              [value]
[user]          hard    locks            [value]

[domain] 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

[type] can have the two values:

  • soft” for enforcing the soft limits
  • hard” for enforcing hard limits

[item] 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



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