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man: describe how to reload sysctl configuration

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Also fixes option name (s/--path/--prefix/).
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-04-02 11:05:11 -04:00
parent f396232996
commit 7382a3cc23
2 changed files with 68 additions and 10 deletions
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9
man/systemd-coredump.xml
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@ -91,6 +91,15 @@
may be used to list and extract coredumps or load them in
<citerefentry project='man-pages'><refentrytitle>gdb</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
<para>The coredump helper is invoked anew each time. Therefore, any configuration
changes will take effect on the invocation of <command>systemd-coredump</command>.
If the sysctl configuration is modified, it must be updated in the kernel before
it takes effect, see
<citerefentry><refentrytitle>systemd-sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
and
<citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>

69
man/systemd-sysctl.service.xml
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@ -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>
@ -91,6 +96,50 @@
</variablelist>
</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>