Manual: systemd-sysctl.service

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). When invoked with positional arguments, the configuration specified by the command line
       arguments is executed. If the string "-" is specified instead of a filename, the configuration is read from standard
       input. If the argument is a file name (without any slashes), all configuration directories are searched for a
       matching file and the file found that has the highest priority is executed. If the argument is a path, that file is
       used directly without searching the configuration directories for any other matching file.

       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.

       --inline
	   Treat each positional argument as a separate configuration line instead of a file name.

	   Added in version 259.

       --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 259.5											   SYSTEMD-SYSCTL.SERVICE(8)