Merge pull request #12062 from poettering/nspawn-main-func

[thirdparty/systemd.git] / man / systemd.socket.xml

diff --git a/man/systemd.socket.xml b/man/systemd.socket.xml
index 72807be7b6904825f288eed13bbc8e4792f79d7d..e29602b068114d5952391730ed0a5915d18f646e 100644 (file)
--- a/man/systemd.socket.xml
+++ b/man/systemd.socket.xml
@@ -1,10 +1,7 @@
 <?xml version='1.0'?>
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
-  SPDX-License-Identifier: LGPL-2.1+
--->
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
 
 <refentry id="systemd.socket">
   <refentryinfo>
@@ -94,6 +91,18 @@
     socket passing (i.e. sockets passed in via standard input and
     output, using <varname>StandardInput=socket</varname> in the
     service file).</para>
+
+    <para>All network sockets allocated through <filename>.socket</filename> units are allocated in the host's network
+    namespace (see <citerefentry
+    project='man-pages'><refentrytitle>network_namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>). This
+    does not mean however that the service activated by a configured socket unit has to be part of the host's network
+    namespace as well.  It is supported and even good practice to run services in their own network namespace (for
+    example through <varname>PrivateNetwork=</varname>, see
+    <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>), receiving only
+    the sockets configured through socket-activation from the host's namespace. In such a set-up communication within
+    the host's network namespace is only permitted through the activation sockets passed in while all sockets allocated
+    from the service code itself will be associated with the service's own namespace, and thus possibly subject to a a
+    much more restrictive configuration.</para>
   </refsect1>
 
   <refsect1>
@@ -841,6 +850,7 @@
       <para>
         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+        <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
         <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
         <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>,