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| -rw-r--r-- | doc/guix.texi | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 69897169bd..5d28fca837 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -15612,13 +15612,15 @@ to add @var{device} to the kernel's entropy pool. The service will fail if @cindex priority @cindex realtime @cindex jackd +@cindex nofile +@cindex open file descriptors @deffn {Scheme Procedure} pam-limits-service [#:limits @code{'()}] Return a service that installs a configuration file for the @uref{http://linux-pam.org/Linux-PAM-html/sag-pam_limits.html, @code{pam_limits} module}. The procedure optionally takes a list of @code{pam-limits-entry} values, which can be used to specify -@code{ulimit} limits and nice priority limits to user sessions. +@code{ulimit} limits and @code{nice} priority limits to user sessions. The following limits definition sets two hard and soft limits for all login sessions of users in the @code{realtime} group: @@ -15634,6 +15636,22 @@ The first entry increases the maximum realtime priority for non-privileged processes; the second entry lifts any restriction of the maximum address space that can be locked in memory. These settings are commonly used for real-time audio systems. + +Another useful example is raising the maximum number of open file +descriptors that can be used: + +@lisp +(pam-limits-service + (list + (pam-limits-entry "*" 'both 'nofile 100000))) +@end lisp + +In the above example, the asterisk means the limit should apply to any +user. It is important to ensure the chosen value doesn't exceed the +maximum system value visible in the @file{/proc/sys/fs/file-max} file, +else the users would be prevented from login in. For more information +about the Pluggable Authentication Module (PAM) limits, refer to the +@samp{pam_limits} man page from the @code{linux-pam} package. @end deffn @node Scheduled Job Execution |