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SYSCTL.D(5)			   sysctl.d			   SYSCTL.D(5)

NAME
       sysctl.d - Configure kernel parameters at boot

SYNOPSIS
       /etc/sysctl.d/*.conf

       /run/sysctl.d/*.conf

       /usr/lib/sysctl.d/*.conf

DESCRIPTION
       At boot, systemd-binfmt.service(8) reads configuration files from the
       above directories to configure sysctl(8) kernel parameters.

CONFIGURATION FORMAT
       The configuration files contain a list of variable assignments,
       separated by newlines. Empty lines and lines whose first non-whitespace
       character is # or ; are ignored.

       Note that both / and . are accepted as label separators within sysctl
       variable names.	kernel.domainname=foo and kernel/domainname=foo hence
       are entirely equivalent.

       Each configuration file shall be named in the style of <program>.conf.
       Files in /etc/ override files with the same name in /usr/lib/ and
       /run/. Files in /run/ override files with the same name in /usr/lib/.
       Packages should install their configuration files in /usr/lib/. Files
       in /etc/ are reserved for the local administrator, who may use this
       logic to override the configuration files installed by vendor packages.
       All configuration files are sorted by their filename in alphabetical
       order, regardless in which of the directories they reside, to guarantee
       that a specific configuration file takes precedence over another file
       with an alphabetically earlier name, if both files contain the same
       variable setting.

       If the administrator wants to disable a configuration file supplied by
       the vendor the recommended way is to place a symlink to /dev/null in
       /etc/sysctl.d/ bearing the same file name.

EXAMPLE
       Example 1. /etc/sysctl.d/domain-name.conf example:

	   # Set kernel YP domain name
	   kernel.domainname=example.com

SEE ALSO
       systemd(1), systemd-sysctl.service(8), systemd-delta(1), sysctl(8),
       sysctl.conf(5)

AUTHOR
       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd				  02/15/2013			   SYSCTL.D(5)

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