'\" t
.\"     Title: sysctl.d
.\"    Author: Lennart Poettering <lennart@poettering.net>
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 10/07/2013
.\"    Manual: sysctl.d
.\"    Source: systemd
.\"  Language: English
.\"
.TH "SYSCTL\&.D" "5" "10/07/2013" "systemd" "sysctl.d"
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.SH "NAME"
sysctl.d \- Configure kernel parameters at boot
.SH "SYNOPSIS"
.PP
/etc/sysctl\&.d/*\&.conf
.PP
/run/sysctl\&.d/*\&.conf
.PP
/usr/lib/sysctl\&.d/*\&.conf
.SH "DESCRIPTION"
.PP
\fBsystemd\fR
uses configuration files from the above directories to configure
\fBsysctl\fR(8)
kernel parameters to load during boot\&.
.SH "CONFIGURATION FORMAT"
.PP
The configuration files should simply contain a list of variable assignments, separated by newlines\&. Empty lines and lines whose first non\-whitespace character is # or ; are ignored\&.
.PP
Note that both / and \&. are accepted as separators in sysctl variable names\&.
.PP
Each configuration file is named in the style of
<program>\&.conf\&. Files in
/etc/
overwrite files with the same name in
/usr/lib/\&. Files in
/run
overwrite files with the same name in
/etc/
and
/usr/lib/\&. Packages should install their configuration files in
/usr/lib/, files in
/etc/
are reserved for the local administration, which possibly decides to overwrite the configurations installed from packages\&. All files are sorted by filename in alphabetical order, regardless in which of the directories they reside, to ensure that a specific configuration file takes precedence over another file with an alphabetically later name\&.
.SH "EXAMPLE"
.PP
\fBExample\ \&1.\ \&/etc/sysctl.d/domain-name.conf example:\fR
.sp
.if n \{\
.RS 4
.\}
.nf
# Set kernel YP domain name
kernel\&.domainname=example\&.com
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.PP

\fBsystemd\fR(1),
\fBsysctl\fR(8),
\fBsysctl.conf\fR(5)
.SH "AUTHOR"
.PP
\fBLennart Poettering\fR <\&lennart@poettering\&.net\&>
.RS 4
Developer
.RE