systemd-sysctl.service(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON

SYSTEMD-SYSCTL.SERVICE(8)systemd-sysctl.serviceSYSTEMD-SYSCTL.SERVICE(8)

NAME         top

       systemd-sysctl.service, systemd-sysctl - Configure kernel
       parameters at boot

SYNOPSIS         top

       /usr/lib/systemd/systemd-sysctl [OPTIONS...] [CONFIGFILE...]

       systemd-sysctl.service

DESCRIPTION         top

       systemd-sysctl.service is an early boot service that configures
       sysctl(8) kernel parameters by invoking
       /usr/lib/systemd/systemd-sysctl.

       When invoked with no arguments, /usr/lib/systemd/systemd-sysctl
       applies all directives from configuration files listed in
       sysctl.d(5). If one or more filenames are passed on the command
       line, only the directives in these files are applied.

       In addition, --prefix= option may be used to limit which sysctl
       settings are applied.

       See sysctl.d(5) for information about the configuration of sysctl
       settings. After sysctl configuration is changed on disk, it must
       be written to the files in /proc/sys/ before it takes effect. It
       is possible to update specific settings, or simply to reload all
       configuration, see Examples below.

OPTIONS         top

       --prefix=
           Only apply rules with the specified prefix.

       --cat-config
           Copy the contents of config files to standard output. Before
           each file, the filename is printed as a comment.

       --no-pager
           Do not pipe output into a pager.

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

EXAMPLES         top

       Example 1. Reset all sysctl settings

           systemctl restart systemd-sysctl

       Example 2. View coredump handler configuration

           # sysctl kernel.core_pattern
           kernel.core_pattern = |/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I

       Example 3. Update coredump handler configuration

           # /usr/lib/systemd/systemd-sysctl --prefix kernel.core_pattern

       This searches all the directories listed in sysctl.d(5) for
       configuration files and writes /proc/sys/kernel/core_pattern.

       Example 4. Update coredump handler configuration according to a
       specific file

           # /usr/lib/systemd/systemd-sysctl 50-coredump.conf

       This applies all the settings found in 50-coredump.conf. Either
       /etc/sysctl.d/50-coredump.conf, or
       /run/sysctl.d/50-coredump.conf, or
       /usr/lib/sysctl.d/50-coredump.conf will be used, in the order of
       preference.

       See sysctl(8) for various ways to directly apply sysctl settings.

SEE ALSO         top

       systemd(1), sysctl.d(5), sysctl(8),

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2021-04-01.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-04-01.)  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

systemd 248                                    SYSTEMD-SYSCTL.SERVICE(8)

Pages that refer to this page: sysctl.d(5)systemd.directives(7)systemd.index(7)systemd-coredump(8)