12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
191 lines
6.8 KiB
XML
191 lines
6.8 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2013 David Strauss
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-socket-proxyd"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-socket-proxyd</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>David</firstname>
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<surname>Strauss</surname>
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<email>david@davidstrauss.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-socket-proxyd</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-socket-proxyd</refname>
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<refpurpose>Bidirectionally proxy local sockets to another (possibly remote) socket.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-socket-proxyd</command>
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<arg choice="opt" rep="repeat"><replaceable>OPTIONS</replaceable></arg>
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<arg choice="plain"><replaceable>HOST</replaceable>:<replaceable>PORT</replaceable></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-socket-proxyd</command>
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<arg choice="opt" rep="repeat"><replaceable>OPTIONS</replaceable></arg>
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<arg choice="plain"><replaceable>UNIX-DOMAIN-SOCKET-PATH</replaceable>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>systemd-socket-proxyd</command> is a generic
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socket-activated network socket forwarder proxy daemon for IPv4,
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IPv6 and UNIX stream sockets. It may be used to bi-directionally
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forward traffic from a local listening socket to a local or remote
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destination socket.</para>
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<para>One use of this tool is to provide socket activation support
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for services that do not natively support socket activation. On
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behalf of the service to activate, the proxy inherits the socket
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from systemd, accepts each client connection, opens a connection
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to a configured server for each client, and then bidirectionally
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forwards data between the two.</para>
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<para>This utility's behavior is similar to
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<citerefentry project='die-net'><refentrytitle>socat</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
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The main differences for <command>systemd-socket-proxyd</command>
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are support for socket activation with
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<literal>Accept=false</literal> and an event-driven
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design that scales better with the number of
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connections.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<refsect2>
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<title>Simple Example</title>
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<para>Use two services with a dependency and no namespace
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isolation.</para>
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<example>
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<title>proxy-to-nginx.socket</title>
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<programlisting><![CDATA[[Socket]
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ListenStream=80
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[Install]
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WantedBy=sockets.target]]></programlisting>
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</example>
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<example>
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<title>proxy-to-nginx.service</title>
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<programlisting><![CDATA[[Unit]
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Requires=nginx.service
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After=nginx.service
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[Service]
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ExecStart=/usr/lib/systemd/systemd-socket-proxyd /tmp/nginx.sock
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PrivateTmp=yes
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PrivateNetwork=yes]]></programlisting>
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</example>
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<example>
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<title>nginx.conf</title>
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<programlisting>
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<![CDATA[[...]
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server {
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listen unix:/tmp/nginx.sock;
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[...]]]>
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</programlisting>
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</example>
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<example>
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<title>Enabling the proxy</title>
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<programlisting><![CDATA[# systemctl enable proxy-to-nginx.socket
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# systemctl start proxy-to-nginx.socket
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$ curl http://localhost:80/]]></programlisting>
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</example>
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</refsect2>
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<refsect2>
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<title>Namespace Example</title>
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<para>Similar as above, but runs the socket proxy and the main
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service in the same private namespace, assuming that
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<filename>nginx.service</filename> has
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<varname>PrivateTmp=</varname> and
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<varname>PrivateNetwork=</varname> set, too.</para>
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<example>
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<title>proxy-to-nginx.socket</title>
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<programlisting><![CDATA[[Socket]
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ListenStream=80
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[Install]
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WantedBy=sockets.target]]></programlisting>
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</example>
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<example>
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<title>proxy-to-nginx.service</title>
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<programlisting><![CDATA[[Unit]
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Requires=nginx.service
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After=nginx.service
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JoinsNamespaceOf=nginx.service
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[Service]
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ExecStart=/usr/lib/systemd/systemd-socket-proxyd 127.0.0.1:8080
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PrivateTmp=yes
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PrivateNetwork=yes]]></programlisting>
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</example>
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<example>
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<title>nginx.conf</title>
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<programlisting><![CDATA[[...]
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server {
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listen 8080;
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[...]]]></programlisting>
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</example>
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<example>
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<title>Enabling the proxy</title>
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<programlisting><![CDATA[# systemctl enable proxy-to-nginx.socket
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# systemctl start proxy-to-nginx.socket
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$ curl http://localhost:80/]]></programlisting>
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</example>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>socat</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>nginx</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>curl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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