limits.conf man page on Ubuntu

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LIMITS.CONF(5)		       Linux-PAM Manual			LIMITS.CONF(5)

NAME
       limits.conf - configuration file for the pam_limits module

DESCRIPTION
       The syntax of the lines is as follows:

       <domain> <type> <item> <value>

       The fields listed above should be filled as follows:

       <domain>

	   ·   a username

	   ·   a groupname, with @group syntax. This should not be confused
	       with netgroups.

	   ·   the wildcard *, for default entry.

	   ·   the wildcard %, for maxlogins limit only, can also be used with
	       %group syntax.

	       NOTE: group and wildcard limits are not applied to the root
	       user. To set a limit for the root user, this field must contain
	       the literal username root.

	   <type>

	       hard
		   for enforcing hard resource limits. These limits are set by
		   the superuser and enforced by the Kernel. The user cannot
		   raise his requirement of system resources above such
		   values.

	       soft
		   for enforcing soft resource limits. These limits are ones
		   that the user can move up or down within the permitted
		   range by any pre-existing hard limits. The values specified
		   with this token can be thought of as default values, for
		   normal system usage.

	       -
		   for enforcing both soft and hard resource limits together.

		   Note, if you specify a type of ´-´ but neglect to supply
		   the item and value fields then the module will never
		   enforce any limits on the specified user/group etc. .

	   <item>

	       core
		   limits the core file size (KB)

	       data
		   maximum data size (KB)

	       fsize
		   maximum filesize (KB)

	       memlock
		   maximum locked-in-memory address space (KB)

	       nofile
		   maximum number of open files

	       rss
		   maximum resident set size (KB) (Ignored in Linux 2.4.30 and
		   higher)

	       stack
		   maximum stack size (KB)

	       cpu
		   maximum CPU time (minutes)

	       nproc
		   maximum number of processes

	       as
		   address space limit (KB)

	       maxlogins
		   maximum number of logins for this user except for this with
		   uid=0

	       maxsyslogins
		   maximum number of logins on system

	       priority
		   the priority to run user process with (negative values
		   boost process priority)

	       locks
		   maximum locked files (Linux 2.4 and higher)

	       sigpending
		   maximum number of pending signals (Linux 2.6 and higher)

	       msqqueue
		   maximum memory used by POSIX message queues (bytes) (Linux
		   2.6 and higher)

	       nice
		   maximum nice priority allowed to raise to (Linux 2.6.12 and
		   higher) values: [-20,19]

	       rtprio
		   maximum realtime priority allowed for non-privileged
		   processes (Linux 2.6.12 and higher)

	       chroot
		   the directory to chroot the user to

	   All items support the values -1, unlimited or infinity indicating
	   no limit, except for priority and nice.

	   If a hard limit or soft limit of a resource is set to a valid
	   value, but outside of the supported range of the local system, the
	   system may reject the new limit or unexpected behavior may occur.
	   If the control value required is used, the module will reject the
	   login if a limit could not be set.

	   In general, individual limits have priority over group limits, so
	   if you impose no limits for admin group, but one of the members in
	   this group have a limits line, the user will have its limits set
	   according to this line.

	   Also, please note that all limit settings are set per login. They
	   are not global, nor are they permanent; existing only for the
	   duration of the session.

	   In the limits configuration file, the ´#´ character introduces a
	   comment - after which the rest of the line is ignored.

	   The pam_limits module does report configuration problems found in
	   its configuration file and errors via syslog(3).

EXAMPLES
       These are some example lines which might be specified in
       /etc/security/limits.conf.

	   *		   soft	   core		   0
	   root		   hard	   core		   100000
	   *		   hard	   rss		   10000
	   @student	   hard	   nproc	   20
	   @faculty	   soft	   nproc	   20
	   @faculty	   hard	   nproc	   50
	   ftp		   hard	   nproc	   0
	   @student	   -	   maxlogins	   4

SEE ALSO
       pam_limits(8), pam.d(5), pam(7), getrlimit(2) getrlimit(3p)

AUTHOR
       pam_limits was initially written by Cristian Gafton <gafton@redhat.com>

Linux-PAM Manual		  08/24/2009			LIMITS.CONF(5)
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