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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | MODULE TYPES PROVIDED | RETURN VALUES | FILES | EXAMPLES | SEE ALSO | AUTHORS | COLOPHON |
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PAM_LIMITS(8) Linux-PAM Manual PAM_LIMITS(8)
pam_limits - PAM module to limit resources
pam_limits.so [conf=/path/to/limits.conf] [debug] [set_all]
[utmp_early] [noaudit]
The pam_limits PAM module sets limits on the system resources that
can be obtained in a user-session. Users of uid=0 are affected by
this limits, too.
By default limits are taken from the /etc/security/limits.conf
config file. Then individual *.conf files from the
/etc/security/limits.d/ directory are read. The files are parsed
one after another in the order of "C" locale. The effect of the
individual files is the same as if all the files were concatenated
together in the order of parsing. If a config file is explicitly
specified with a module option then the files in the above
directory are not parsed.
The module must not be called by a multithreaded application.
If Linux PAM is compiled with audit support the module will report
when it denies access based on limit of maximum number of
concurrent login sessions.
conf=/path/to/limits.conf
Indicate an alternative limits.conf style configuration file
to override the default.
debug
Print debug information.
set_all
Set the limits for which no value is specified in the
configuration file to the one from the process with the PID 1.
Please note that if the init process is systemd these limits
will not be the kernel default limits and this option should
not be used.
utmp_early
Some broken applications actually allocate a utmp entry for
the user before the user is admitted to the system. If some of
the services you are configuring PAM for do this, you can
selectively use this module argument to compensate for this
behavior and at the same time maintain system-wide consistency
with a single limits.conf file.
noaudit
Do not report exceeded maximum logins count to the audit
subsystem.
Only the session module type is provided.
PAM_ABORT
Cannot get current limits.
PAM_IGNORE
No limits found for this user.
PAM_PERM_DENIED
New limits could not be set.
PAM_SERVICE_ERR
Cannot read config file.
PAM_SESSION_ERR
Error recovering account name.
PAM_SUCCESS
Limits were changed.
PAM_USER_UNKNOWN
The user is not known to the system.
/etc/security/limits.conf
Default configuration file
For the services you need resources limits (login for example) put
a the following line in /etc/pam.d/login as the last line for that
service (usually after the pam_unix session line):
#%PAM-1.0
#
# Resource limits imposed on login sessions via pam_limits
#
session required pam_limits.so
Replace "login" for each service you are using this module.
limits.conf(5), pam.d(5), pam(8).
pam_limits was initially written by Cristian Gafton
<gafton@redhat.com>
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Linux-PAM Manual 12/22/2023 PAM_LIMITS(8)
Pages that refer to this page: limits.conf(5)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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