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diff --git a/man/systemd-sabridge.xml b/man/systemd-sabridge.xml new file mode 100644 index 0000000000..abeb1a5a4c --- /dev/null +++ b/man/systemd-sabridge.xml @@ -0,0 +1,254 @@ +<?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. + + Copyright 2013 David Strauss + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + 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="systemd-sabridge"> + <refentryinfo> + <title>systemd-sabridge</title> + <productname>systemd</productname> + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>David</firstname> + <surname>Strauss</surname> + <email>david@davidstrauss.net</email> + </author> + </authorgroup> + </refentryinfo> + <refmeta> + <refentrytitle>systemd-sabridge</refentrytitle> + <manvolnum>1</manvolnum> + </refmeta> + <refnamediv> + <refname>systemd-sabridge</refname> + <refpurpose>Inherit a socket. Bidirectionally + proxy.</refpurpose> + </refnamediv> + <refsynopsisdiv> + <cmdsynopsis> + <command>systemd-sabridge</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <arg choice="plain"><replaceable>HOSTNAME-OR-IP</replaceable></arg> + <arg choice="plain"><replaceable>PORT-OR-SERVICE</replaceable></arg> + </cmdsynopsis> + <cmdsynopsis> + <command>systemd-sabridge</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <arg choice="plain"><replaceable>UNIX-DOMAIN-SOCKET-PATH</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + <refsect1> + <title>Description</title> + <para> + <command>systemd-sabridge</command>provides a proxy + to socket-activate services that do not yet support + native socket activation. On behalf of the daemon, + the proxy inherits the socket from systemd, accepts + each client connection, opens a connection to the server + for each client, and then bidirectionally forwards + data between the two.</para> + <para>This utility's behavior is similar to + <citerefentry><refentrytitle>socat</refentrytitle><manvolnum>1</manvolnum> </citerefentry>. + The main differences for <command>systemd-sabridge</command> + are support for socket activation with + <literal>Accept=false</literal> and an event-driven + design that scales better with the number of + connections.</para> + </refsect1> + <refsect1> + <title>Options</title> + <para>The following options are understood:</para> + <variablelist> + <varlistentry> + <term><option>-h</option></term> + <term><option>--help</option></term> + <listitem> + <para>Prints a short help + text and exits.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>--version</option></term> + <listitem> + <para>Prints a version + string and exits.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>--ignore-env</option></term> + <listitem> + <para>Skips verification of + the expected PID and file + descriptor numbers. Use if + invoked indirectly, for + example with a shell script + rather than with + <option>ExecStart=/usr/bin/systemd-sabridge</option> + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + <refsect1> + <title>Exit status</title> + <para>On success 0 is returned, a non-zero failure + code otherwise.</para> + </refsect1> + <refsect1> + <title>Examples</title> + <refsect2> + <title>Direct-Use Example</title> + <para>Use two services with a dependency + and no namespace isolation.</para> + <example label="bridge socket unit"> + <title>/etc/systemd/system/bridge-to-nginx.socket</title> + <programlisting> +<![CDATA[[Socket] +ListenStream=80 + +[Install] +WantedBy=socket.target]]> +</programlisting> + </example> + <example label="bridge service unit"> + <title>/etc/systemd/system/bridge-to-nginx.service</title> + <programlisting> +<![CDATA[[Unit] +After=nginx.service +Requires=nginx.service + +[Service] +ExecStart=/usr/bin/systemd-sabridge /tmp/nginx.sock +PrivateTmp=true +PrivateNetwork=true]]> +</programlisting> + </example> + <example label="nginx configuration"> + <title>/etc/nginx/nginx.conf</title> + <programlisting> +<![CDATA[[...] +server { + listen unix:/tmp/nginx.sock; + [...]]]> +</programlisting> + </example> + <example label="commands"> + <programlisting> +<![CDATA[$ sudo systemctl --system daemon-reload +$ sudo systemctl start bridge-to-nginx.socket +$ sudo systemctl enable bridge-to-nginx.socket +$ curl http://localhost:80/]]> +</programlisting> + </example> + </refsect2> + <refsect2> + <title>Indirect-Use Example</title> + <para>Use a shell script to isolate the + service and bridge into the same namespace. + This is particularly useful for running + TCP-only daemons without the daemon + affecting ports on regular + interfaces.</para> + <example label="combined bridge and nginx socket unit"> + + <title> + /etc/systemd/system/bridge-with-nginx.socket</title> + <programlisting> +<![CDATA[[Socket] +ListenStream=80 + +[Install] +WantedBy=socket.target]]> +</programlisting> + </example> + <example label="combined bridge and nginx service unit"> + + <title> + /etc/systemd/system/bridge-with-nginx.service</title> + <programlisting> +<![CDATA[[Unit] +After=syslog.target remote-fs.target nss-lookup.target + +[Service] +ExecStartPre=/usr/sbin/nginx -t +ExecStart=/usr/bin/sabridge-nginx.sh +PrivateTmp=true +PrivateNetwork=true]]> +</programlisting> + </example> + <example label="shell script"> + <title> + /usr/bin/sabridge-nginx.sh</title> + <programlisting> +<![CDATA[#!/bin/sh +/usr/sbin/nginx +while [ ! -f /tmp/nginx.pid ] + do + /usr/bin/inotifywait /tmp/nginx.pid + done +/usr/bin/systemd-sabridge --ignore-env localhost 8080]]> +</programlisting> + </example> + <example label="nginx configuration"> + <title> + /etc/nginx/nginx.conf</title> + <programlisting> +<![CDATA[[...] +server { + listen 8080; + listen unix:/tmp/nginx.sock; + [...]]]> +</programlisting> + </example> + <example label="commands"> + <programlisting> +<![CDATA[$ sudo systemctl --system daemon-reload +$ sudo systemctl start bridge-with-nginx.socket +$ sudo systemctl enable bridge-with-nginx.socket +$ curl http://localhost:80/]]> +</programlisting> + </example> + </refsect2> + </refsect1> + <refsect1> + <title>See Also</title> + <para> + <citerefentry> + <refentrytitle> + systemd.service</refentrytitle> + <manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle> + systemd.socket</refentrytitle> + <manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>systemctl</refentrytitle> + <manvolnum>1</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>socat</refentrytitle> + <manvolnum>1</manvolnum> + </citerefentry></para> + </refsect1> +</refentry> |