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man: document LogNamespace= unit setting

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Lennart Poettering 2019-11-28 10:02:02 +01:00
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man/systemd.exec.xml
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@ -70,6 +70,10 @@
<option>syslog</option> or <option>kmsg</option> (or their combinations with console output, see below)
automatically acquire dependencies of type <varname>After=</varname> on
<filename>systemd-journald.socket</filename>.</para></listitem>
<listitem><para>Units using <varname>LogNamespace=</varname> will automatically gain ordering and
requirement dependencies on the two socket units associated with
<filename>systemd-journald@.service</filename> instances.</para></listitem>
</itemizedlist>
</refsect1>
@ -2254,6 +2258,36 @@ StandardInputData=SWNrIHNpdHplIGRhIHVuJyBlc3NlIEtsb3BzLAp1ZmYgZWVtYWwga2xvcHAncy
</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>LogNamespace=</varname></term>
<listitem><para>Run the unit's processes in the specified journal namespace. Expects a short
user-defined string identifying the namespace. If not used the processes of the service are run in
the default journal namespace, i.e. their log stream is collected and processed by
<filename>systemd-journald.service</filename>. If this option is used any log data generated by
processes of this unit (regardless if via the <function>syslog()</function>, journal native logging
or stdout/stderr logging) is collected and processed by an instance of the
<filename>systemd-journald@.service</filename> template unit, which manages the specified
namespace. The log data is stored in a data store independent from the default log namespace's data
store. See
<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
for details about journal namespaces.</para>
<para>Internally, journal namespaces are implemented through Linux mount namespacing and
over-mounting the directory that contains the relevant <constant>AF_UNIX</constant> sockets used for
logging in the unit's mount namespace. Since mount namespaces are used this setting disconnects
propagation of mounts from the unit's processes to the host, similar to how
<varname>ReadOnlyPaths=</varname> and similar settings (see above) work. Journal namespaces may hence
not be used for services that need to establish mount points on the host.</para>
<para>When this option is used the unit will automatically gain ordering and requirement dependencies
on the two socket units associated with the <filename>systemd-journald@.service</filename> instance
so that they are automatically established prior to the unit starting up. Note that when this option
is used log output of this service does not appear in the regular
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
output, unless the <option>--namespace=</option> option is used.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>SyslogIdentifier=</varname></term>