-<?xml version="1.0"?>
-<!--*-nxml-*-->
+<?xml version="1.0"?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
-<refentry id="sysctl.d">
+<refentry id="sysctl.d"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sysctl.d</title>
<filename>/proc/sys/net/ipv4/conf/enp3s0.200/forwarding</filename>.
</para>
- <para>Each configuration file shall be named in the
- style of <filename><replaceable>program</replaceable>.conf</filename>.
- Files in <filename>/etc/</filename> override files
- with the same name in <filename>/usr/lib/</filename>
- and <filename>/run/</filename>. Files in
- <filename>/run/</filename> override files with the same
- name in <filename>/usr/lib/</filename>. Packages
- should install their configuration files in
- <filename>/usr/lib/</filename>. Files in
- <filename>/etc/</filename> 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.</para>
-
- <para>If the administrator wants to disable a
- configuration file supplied by the vendor, the
- recommended way is to place a symlink to
- <filename>/dev/null</filename> in
- <filename>/etc/sysctl.d/</filename> bearing the
- same filename.</para>
-
<para>The settings configured with
<filename>sysctl.d</filename> files will be applied
early on boot. The network interface-specific options
specifically,
<filename>net.ipv4.conf.*</filename>,
<filename>net.ipv6.conf.*</filename>,
- <filename>net.ipv4.neigh.*</filename> and <filename>net.ipv6.neigh.*</filename>)</para>
+ <filename>net.ipv4.neigh.*</filename> and <filename>net.ipv6.neigh.*</filename>).</para>
+
+ <para>Many sysctl parameters only become available
+ when certain kernel modules are loaded. Modules are
+ usually loaded on demand, e.g. when certain hardware
+ is plugged in or network brought up. This means that
+ <citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> which runs
+ during early boot will not configure such parameters
+ if they become available after it has run. To
+ set such parameters, it is recommended to add
+ an <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry> rule to set those parameters when they become
+ available. Alternatively, a slightly simpler and
+ less efficient option is to add the module to
+ <citerefentry><refentrytitle>modules-load.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, causing it to be loaded statically
+ before sysctl settings are applied (see
+ example below).</para>
</refsect1>
+ <xi:include href="standard-conf.xml" xpointer="confd" />
+
<refsect1>
- <title>Example</title>
+ <title>Examples</title>
+ <example>
+ <title>Set kernel YP domain name</title>
+ <para><filename>/etc/sysctl.d/domain-name.conf</filename>:
+ </para>
+
+ <programlisting>kernel.domainname=example.com</programlisting>
+ </example>
+
+ <example>
+ <title>Disable packet filter on bridged packets (method one)</title>
+ <para><filename>/etc/udev/rules.d/99-bridge.rules</filename>:
+ </para>
+
+ <programlisting>ACTION=="add", SUBSYSTEM=="module", KERNEL=="bridge", RUN+="/usr/lib/systemd/systemd-sysctl --prefix=/net/bridge"
+</programlisting>
+
+ <para><filename>/etc/sysctl.d/bridge.conf</filename>:
+ </para>
+
+ <programlisting>net.bridge.bridge-nf-call-ip6tables = 0
+net.bridge.bridge-nf-call-iptables = 0
+net.bridge.bridge-nf-call-arptables = 0
+</programlisting>
+ </example>
+
<example>
- <title>/etc/sysctl.d/domain-name.conf example:</title>
+ <title>Disable packet filter on bridged packets (method two)</title>
+ <para><filename>/etc/modules-load.d/bridge.conf</filename>:
+ </para>
+
+ <programlisting>bridge</programlisting>
+
+ <para><filename>/etc/sysctl.d/bridge.conf</filename>:
+ </para>
- <programlisting># Set kernel YP domain name
-kernel.domainname=example.com</programlisting>
+ <programlisting>net.bridge.bridge-nf-call-ip6tables = 0
+net.bridge.bridge-nf-call-iptables = 0
+net.bridge.bridge-nf-call-arptables = 0
+</programlisting>
</example>
</refsect1>
<citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-delta</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sysctl.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>sysctl.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>modprobe</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
~ianmdlvl / elogind.git / blobdiff