SYSTEMD-SYSCTL.SERVICE(8) systemd-sysctl.service SYSTEMD-SYSCTL.SERVICE(8)
NAME
systemd-sysctl.service, systemd-sysctl - Configure kernel parameters at
boot
SYNOPSIS
/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 /lib/systemd/systemd-sysctl.
When invoked with no arguments, /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.
--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.
--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.
CREDENTIALS
systemd-sysctl supports the service credentials logic as implemented by
LoadCredential=/SetCredential= (see systemd.exec(1) 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.
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 = |/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I
Example 3. Update coredump handler configuration
# /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
# /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 252 SYSTEMD-SYSCTL.SERVICE(8)
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