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doc: Add an example of how the open file descriptors limit can be raised.

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* doc/guix.texi (Base Services)[pam-limits-service]: Add an example and
explanation of how the 'nofile', or open file descriptors value, can be
configured.
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Maxim Cournoyer 2021-02-18 18:07:53 -05:00
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commit 28a2c9c9e1
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1 changed files with 19 additions and 1 deletions
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@ -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