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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-04-02 11:05:11 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-04-02 11:35:08 -0400
commit7382a3cc232a0b60f1cd4604ce8fa9ae79f654e9 (patch)
tree04d70881ca89ec7bb9bf3f976fa8b8c1b5ecff6f /man/systemd-sysctl.service.xml
parentf396232996b5d347cd743ff1d181ed6e5b7209f7 (diff)
man: describe how to reload sysctl configuration
Also fixes option name (s/--path/--prefix/).
Diffstat (limited to 'man/systemd-sysctl.service.xml')
-rw-r--r--man/systemd-sysctl.service.xml69
1 files changed, 59 insertions, 10 deletions
diff --git a/man/systemd-sysctl.service.xml b/man/systemd-sysctl.service.xml
index 9027ff0f3f..686b2cdef4 100644
--- a/man/systemd-sysctl.service.xml
+++ b/man/systemd-sysctl.service.xml
@@ -62,24 +62,29 @@
<para><filename>systemd-sysctl.service</filename> is an early boot
service that configures
<citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- kernel parameters.</para>
+ kernel parameters by invoking <command>/usr/lib/systemd/systemd-sysctl</command>.</para>
- <para>If invoked with no arguments, it applies all directives from
- all configuration files in
- <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- are searched for a matching file. If one or more filenames are passed on
- the command line, only the directives in these files are applied.
- </para>
+ <para>When invoked with no arguments, <command>/usr/lib/systemd/systemd-sysctl</command> applies
+ all directives from configuration files listed in
+ <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ If one or more filenames are passed on the command line, only the directives in these files are
+ applied.</para>
+
+ <para>In addition, <option>--prefix=</option> option may be used to limit which sysctl
+ settings are applied.</para>
<para>See
<citerefentry project='man-pages'><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for information about the configuration of this service.</para>
+ for information about the configuration of sysctl settings. After sysctl configuration is
+ changed on disk, it must be written to the files in <filename>/proc/sys</filename> before it
+ takes effect. It is possible to update specific settings, or simply to reload all configuration,
+ see Examples below.</para>
</refsect1>
<refsect1><title>Options</title>
<variablelist>
- <varlistentry id='path'>
- <term><option>--path=</option></term>
+ <varlistentry id='prefix'>
+ <term><option>--prefix=</option></term>
<listitem>
<para>Only apply rules with the specified prefix.</para>
</listitem>
@@ -92,6 +97,50 @@
</refsect1>
<refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Reset all sysctl settings</title>
+
+ <programlisting>systemctl restart systemd-sysctl</programlisting>
+ </example>
+
+ <example>
+ <title>View coredump handler configuration</title>
+
+ <programlisting># sysctl kernel.core_pattern
+kernel.core_pattern = |/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I
+</programlisting>
+ </example>
+
+ <example>
+ <title>Update coredump handler configuration</title>
+
+ <programlisting># /usr/lib/systemd/systemd-sysctl --prefix kernel.core_pattern</programlisting>
+
+ <para>This searches all the directories listed in
+ <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for configuration files and writes <filename>/proc/sys/kernel/core_pattern</filename>.</para>
+ </example>
+
+ <example>
+ <title>Update coredump handler configuration according to a specific file</title>
+
+ <programlisting># /usr/lib/systemd/systemd-sysctl 50-coredump.conf</programlisting>
+
+ <para>This applies all the settings found in <filename>50-coredump.conf</filename>.
+ Either <filename>/etc/sysctl.d/50-coredump.conf</filename>, or
+ <filename>/run/sysctl.d/50-coredump.conf</filename>, or
+ <filename>/usr/lib/sysctl.d/50-coredump.conf</filename> will be used, in the order
+ of preference.</para>
+ </example>
+
+ <para>See
+ <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ for various ways to directly apply sysctl settings.</para>
+ </refsect1>
+
+ <refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,