8dd4c05b54
This adds support for naming file descriptors passed using socket activation. The names are passed in a new $LISTEN_FDNAMES= environment variable, that matches the existign $LISTEN_FDS= one and contains a colon-separated list of names. This also adds support for naming fds submitted to the per-service fd store using FDNAME= in the sd_notify() message. This also adds a new FileDescriptorName= setting for socket unit files to set the name for fds created by socket units. This also adds a new call sd_listen_fds_with_names(), that is similar to sd_listen_fds(), but also returns the names of the fds. systemd-activate gained the new --fdname= switch to specify a name for testing socket activation. This is based on #1247 by Maciej Wereski. Fixes #1247.
185 lines
7.1 KiB
XML
185 lines
7.1 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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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 Zbigniew Jędrzejewski-Szmek
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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-activate"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-activate</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>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</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-activate</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-activate</refname>
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<refpurpose>Test socket activation of daemons</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>/usr/lib/systemd/systemd-activate</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain"><replaceable>daemon</replaceable></arg>
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<arg choice="opt" rep="repeat">OPTIONS</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><command>systemd-activate</command> can be used to
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launch a socket activated daemon from the command line for
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testing purposes. It can also be used to launch single instances
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of the daemon per connection (inetd-style).
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</para>
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<para>The daemon to launch and its options should be specified
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after options intended for <command>systemd-activate</command>.
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</para>
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<para>If the <option>-a</option> option is given, file descriptor
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of the connection will be used as the standard input and output of
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the launched process. Otherwise, standard input and output will be
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inherited, and sockets will be passed through file descriptors 3
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and higher. Sockets passed through <varname>$LISTEN_FDS</varname>
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to <command>systemd-activate</command> will be passed through to
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the daemon, in the original positions. Other sockets specified
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with <option>--listen</option> will use consecutive descriptors.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<variablelist>
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<varlistentry>
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<term><option>-l <replaceable>address</replaceable></option></term>
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<term><option>--listen=<replaceable>address</replaceable></option></term>
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<listitem><para>Listen on this <replaceable>address</replaceable>.
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Takes a string like <literal>2000</literal> or
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<literal>127.0.0.1:2001</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-a</option></term>
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<term><option>--accept</option></term>
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<listitem><para>Launch a separate instance of daemon per
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connection and pass the connection socket as standard input
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and standard output.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-E <replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term>
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<term><option>--setenv=<replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term>
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<listitem><para>Add this variable to the environment of the
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launched process. If <replaceable>VAR</replaceable> is
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followed by <literal>=</literal>, assume that it is a
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variable–value pair. Otherwise, obtain the value from the
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environment of <command>systemd-activate</command> itself.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--fdname=</option><replaceable>NAME</replaceable></term>
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<listitem><para>Specify a name for the activation file
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descriptors. This is equivalent to setting
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<varname>FileDescriptorName=</varname> in socket unit files, and
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enables use of
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<citerefentry><refentrytitle>sd_listen_fds_with_names</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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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>Environment variables</title>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$LISTEN_FDS</varname></term>
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<term><varname>$LISTEN_PID</varname></term>
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<term><varname>$LISTEN_FDNAMES</varname></term>
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<listitem><para>See
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<citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$SYSTEMD_LOG_TARGET</varname></term>
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<term><varname>$SYSTEMD_LOG_LEVEL</varname></term>
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<term><varname>$SYSTEMD_LOG_COLOR</varname></term>
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<term><varname>$SYSTEMD_LOG_LOCATION</varname></term>
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<listitem><para>Same as in
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example>
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<title>Run an echo server on port 2000</title>
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<programlisting>$ /usr/lib/systemd/systemd-activate -l 2000 -a cat</programlisting>
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</example>
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<example>
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<title>Run a socket activated instance of <citerefentry><refentrytitle>systemd-journal-gatewayd</refentrytitle><manvolnum>8</manvolnum></citerefentry></title>
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<programlisting>$ /usr/lib/systemd/systemd-activate -l 19531 /usr/lib/systemd/systemd-journal-gatewayd</programlisting>
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</example>
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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>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_listen_fds_with_names</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>cat</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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