NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CREDENTIALS | EXAMPLES | SEE ALSO | COLOPHON
systemd-sysctl.service, systemd-sysctl - Configure kernel parameters at boot
/usr/lib/systemd/systemd-sysctl [OPTIONS...] [CONFIGFILE...] systemd-sysctl.service
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.
--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.
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.
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.
systemd(1), sysctl.d(5), sysctl(8)
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 2022-12-17. (At that time, the date of the most recent commit that was found in the repository was 2022-12-16.) 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 email@example.com systemd 252 SYSTEMD-SYSCTL.SERVICE(8)
Pages that refer to this page: sysctl.d(5), systemd.directives(7), systemd.index(7), systemd-coredump(8)