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

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

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

       systemd-sysctl.service

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

	   Added in version 230.

       --strict=
	   Always return non-zero exit code on failure (including invalid
	   sysctl variable name and insufficient permissions), unless the
	   sysctl variable name is prefixed with a "-" character.

	   Added in version 252.

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

       --tldr
	   Copy the contents of config files to standard output. Only the
	   "interesting" parts of the configuration files are printed,
	   comments and empty lines are skipped. 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.

CREDENTIALS
       systemd-sysctl supports the service credentials logic as implemented by
       ImportCredential=/LoadCredential=/SetCredential= (see systemd.exec(5)
       for details). The following credentials are used when passed in:

       sysctl.extra
	   The contents of this credential may contain additional lines to
	   operate on. The credential contents should follow the same format
	   as any other sysctl.d/ drop-in configuration file. If this
	   credential is passed it is processed after all of the drop-in files
	   read from the file system. The settings configured in the
	   credential hence take precedence over those in the file system.

	   Added in version 252.

       Note that by default the systemd-sysctl.service unit file is set up to
       inherit the "sysctl.extra" credential from the service manager.

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

systemd 258					     SYSTEMD-SYSCTL.SERVICE(8)