PAM_LIMITS(8)

  .SH "NAME" pam_limits - PAM module to limit resources
  .SH "SYNOPSIS"
    .HP u
      pam_limits.so
       [conf=/path/to/limits.conf]
       [debug]
       [set_all]
       [utmp_early]
       [noaudit]

  .SH "DESCRIPTION"

    .PP 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.

    .PP By default limits are taken from the /etc/security/limits.conf config file or, if that one is not present, the file /usr/share/pam/security/limits.conf. Then individual *.conf files from the /etc/security/limits.d/ and /usr/share/pam/security/limits.d directories are read. If /etc/security/limits.d/@filename@.conf exists, then /usr/share/pam/security/limits.d/@filename@.conf will not be used. All limits.d/*.conf files are sorted by their @filename@.conf in lexicographic order regardless of which of the directories they reside in. 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 the config option the files in the above directories are not parsed.
    .PP The module must not be called by a multithreaded application.
    .PP 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.

  .SH "OPTIONS"

      .PP conf=/path/to/limits.conf

              Indicate an alternative limits.conf style configuration file to override the default.

          .RE
          .PP debug

                  Print debug information.

              .RE
              .PP 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.

                  .RE
                  .PP 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.

                      .RE
                      .PP noaudit

                              Do not report exceeded maximum logins count to the audit subsystem.

                          .RE

                      .SH "MODULE TYPES PROVIDED"

                        .PP Only the session module type is provided.

                      .SH "RETURN VALUES"

                          .PP PAM_ABORT

                                   Cannot get current limits.

                              .RE
                              .PP PAM_IGNORE

                                       No limits found for this user.

                                  .RE
                                  .PP PAM_PERM_DENIED

                                          New limits could not be set.

                                      .RE
                                      .PP PAM_SERVICE_ERR

                                               Cannot read config file.

                                          .RE
                                          .PP PAM_SESSION_ERR

                                                   Error recovering account name.

                                              .RE
                                              .PP PAM_SUCCESS

                                                       Limits were changed.

                                                  .RE
                                                  .PP PAM_USER_UNKNOWN

                                                           The user is not known to the system.

                                                      .RE

                                                  .SH "FILES"

                                                      .PP /etc/security/limits.conf

                                                              Default configuration file

                                                          .RE
                                                          .PP /usr/share/pam/security/limits.conf

                                                                  Default configuration file if /etc/security/limits.conf does not exist.

                                                              .RE

                                                          .SH "EXAMPLES"

                                                            .PP 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

                                                            .PP Replace "login" for each service you are using this module.

                                                          .SH "SEE ALSO"

                                                            .PP limits.conf(5), pam.d(5), pam(8).

                                                          .SH "AUTHORS"

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