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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-sysctl.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 lexicographic
       order, regardless in which of the directories they reside. If multiple
       files specify the same variable name, the entry in the file with the
       lexicographically latest name will be applied. It is recommended to
       prefix all filenames with a two-digit number and a dash, to simplify
       the ordering of the files.

       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 filename.

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)

systemd 207							   SYSCTL.D(5)

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