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113 lines
3.6 KiB
Groff
113 lines
3.6 KiB
Groff
'\" t
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.TH "SYSCTL\&.D" "5" "" "systemd 214" "sysctl.d"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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sysctl.d \- Configure kernel parameters at boot
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.SH "SYNOPSIS"
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.PP
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/etc/sysctl\&.d/*\&.conf
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.PP
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/run/sysctl\&.d/*\&.conf
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.PP
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/usr/lib/sysctl\&.d/*\&.conf
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.SH "DESCRIPTION"
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.PP
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At boot,
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\fBsystemd-sysctl.service\fR(8)
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reads configuration files from the above directories to configure
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\fBsysctl\fR(8)
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kernel parameters\&.
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.SH "CONFIGURATION FORMAT"
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.PP
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The configuration files contain a list of variable assignments, separated by newlines\&. Empty lines and lines whose first non\-whitespace character is
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"#"
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or
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";"
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are ignored\&.
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.PP
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Note that either
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"/"
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or
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"\&."
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may be used as separators within sysctl variable names\&. If the first separator is a slash, remaining slashes and dots are left intact\&. If the first separator is a dot, dots and slashes are interchanged\&.
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"kernel\&.domainname=foo"
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and
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"kernel/domainname=foo"
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are equivalent and will cause
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"foo"
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to be written to
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/proc/sys/kernel/domainname\&. Either
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"net\&.ipv4\&.conf\&.enp3s0/200\&.forwarding"
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or
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"net/ipv4/conf/enp3s0\&.200/forwarding"
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may be used to refer to
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/proc/sys/net/ipv4/conf/enp3s0\&.200/forwarding\&.
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.PP
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Each configuration file shall be named in the style of
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\fIprogram\fR\&.conf\&. Files in
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/etc/
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override files with the same name in
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/usr/lib/
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and
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/run/\&. Files in
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/run/
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override files with the same name in
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/usr/lib/\&. Packages should install their configuration files in
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/usr/lib/\&. Files in
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/etc/
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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 of which of the directories they reside in\&. 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\&.
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.PP
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If the administrator wants to disable a configuration file supplied by the vendor, the recommended way is to place a symlink to
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/dev/null
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in
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/etc/sysctl\&.d/
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bearing the same filename\&.
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.PP
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The settings configured with
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sysctl\&.d
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files will be applied early on boot\&. The network interface\-specific options will also be applied individually for each network interface as it shows up in the system\&. (More specifically,
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net\&.ipv4\&.conf\&.*,
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net\&.ipv6\&.conf\&.*,
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net\&.ipv4\&.neigh\&.*
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and
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net\&.ipv6\&.neigh\&.*)
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.SH "EXAMPLE"
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.PP
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\fBExample\ \&1.\ \&/etc/sysctl.d/domain-name.conf example:\fR
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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# Set kernel YP domain name
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kernel\&.domainname=example\&.com
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.fi
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.if n \{\
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.RE
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.\}
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.SH "SEE ALSO"
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.PP
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\fBsystemd\fR(1),
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\fBsystemd-sysctl.service\fR(8),
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\fBsystemd-delta\fR(1),
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\fBsysctl\fR(8),
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\fBsysctl.conf\fR(5)
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