man/systemd-activate.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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   8 Copyright 2013 Zbigniew Jędrzejewski-Szmek
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  23
  24 <refentry id="systemd-activate">
  25
  26   <refentryinfo>
  27     <title>systemd-activate</title>
  28     <productname>systemd</productname>
  29
  30     <authorgroup>
  31       <author>
  32         <contrib>Developer</contrib>
  33         <firstname>Zbigniew</firstname>
  34         <surname>Jędrzejewski-Szmek</surname>
  35         <email>zbyszek@in.waw.pl</email>
  36       </author>
  37     </authorgroup>
  38   </refentryinfo>
  39
  40   <refmeta>
  41     <refentrytitle>systemd-activate</refentrytitle>
  42     <manvolnum>8</manvolnum>
  43   </refmeta>
  44
  45   <refnamediv>
  46     <refname>systemd-activate</refname>
  47     <refpurpose>Test socket activation of daemons</refpurpose>
  48   </refnamediv>
  49
  50   <refsynopsisdiv>
  51     <cmdsynopsis>
  52       <command>/usr/lib/systemd/systemd-activate</command>
  53       <arg choice="opt" rep="repeat">OPTIONS</arg>
  54       <arg choice="plain"><replaceable>daemon</replaceable></arg>
  55       <arg choice="opt" rep="repeat">OPTIONS</arg>
  56     </cmdsynopsis>
  57   </refsynopsisdiv>
  58
  59   <refsect1>
  60     <title>Description</title>
  61
  62     <para><command>systemd-activate</command> can be used to
  63     launch a socket activated daemon from the command-line for
  64     testing purposes. It can also be used to launch single instances
  65     of the daemon per connection (inetd-style).
  66     </para>
  67
  68     <para>The daemon to launch and its options should be specifed
  69     after options intended for <command>systemd-activate</command>.
  70     </para>
  71
  72     <para>If the <option>-a</option> option is given, file descriptor
  73     of the connection will be used as the standard input and output of
  74     the launched process. Otherwise, standard input and output will be
  75     inherited, and sockets will be passed through file descriptors 3
  76     and higher. Sockets passed through <varname>$LISTEN_FDS</varname>
  77     to <command>systemd-activate</command> will be passed through to
  78     the dameon, in the original positions. Other sockets specified
  79     with <option>--listen</option> will use consecutive descriptors.
  80     </para>
  81   </refsect1>
  82
  83   <refsect1>
  84     <title>Options</title>
  85     <variablelist>
  86       <varlistentry>
  87         <term><option>--help</option></term>
  88         <term><option>-h</option></term>
  89
  90         <listitem><para>Prints a short help
  91         text and exits.</para></listitem>
  92       </varlistentry>
  93
  94       <varlistentry>
  95         <term><option>--version</option></term>
  96
  97         <listitem><para>Prints a short version
  98         string and exits.</para></listitem>
  99       </varlistentry>
 100
 101       <varlistentry>
 102         <term><option>-l <replaceable>address</replaceable></option></term>
 103         <term><option>--listen=<replaceable>address</replaceable></option></term>
 104
 105         <listitem><para>Listen on this <replaceable>address</replaceable>.
 106         Takes a string like <literal>2000</literal> or
 107         <literal>127.0.0.1:2001</literal>.</para>
 108         </listitem>
 109       </varlistentry>
 110
 111       <varlistentry>
 112         <term><option>-a</option></term>
 113         <term><option>--accept</option></term>
 114
 115         <listitem><para>Launch a separate instance of daemon per
 116         connection and pass the connection socket as standard input
 117         and standard output.</para></listitem>
 118       </varlistentry>
 119
 120       <varlistentry>
 121         <term><option>-E <replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term>
 122         <term><option>--environment=<replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term>
 123
 124         <listitem><para>Add this variable to the environment of the
 125         launched process. If <replaceable>VAR</replaceable> is
 126         followed by <literal>=</literal> assume that it is a
 127         variable–value pair. Otherwise obtain the value from the
 128         environment of <command>systemd-activate</command> itself.
 129         </para></listitem>
 130       </varlistentry>
 131     </variablelist>
 132   </refsect1>
 133
 134   <refsect1>
 135     <title>Environment variables</title>
 136     <variablelist class='environment-variables'>
 137       <varlistentry>
 138         <term><varname>$LISTEN_FDS</varname></term>
 139         <term><varname>$LISTEN_PID</varname></term>
 140
 141         <listitem><para>See
 142         <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
 143       </varlistentry>
 144
 145       <varlistentry>
 146         <term><varname>$SYSTEMD_LOG_TARGET</varname></term>
 147         <term><varname>$SYSTEMD_LOG_LEVEL</varname></term>
 148         <term><varname>$SYSTEMD_LOG_COLOR</varname></term>
 149         <term><varname>$SYSTEMD_LOG_LOCATION</varname></term>
 150
 151         <listitem><para>Same as in
 152         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para></listitem>
 153       </varlistentry>
 154     </variablelist>
 155   </refsect1>
 156
 157   <refsect1>
 158     <title>Example 1</title>
 159
 160     <programlisting>$ /usr/lib/systemd/systemd-activate -l 2000 -a cat</programlisting>
 161
 162     <para>This runs an echo server on port 2000.</para>
 163   </refsect1>
 164
 165   <refsect1>
 166     <title>Example 2</title>
 167
 168     <programlisting>$ /usr/lib/systemd/systemd-activate -l 19531 /usr/lib/systemd/systemd-journal-gatewayd</programlisting>
 169
 170     <para>This runs a socket activated instance of
 171     <citerefentry><refentrytitle>systemd-journal-gatewayd</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
 172   </refsect1>
 173
 174   <refsect1>
 175     <title>See Also</title>
 176     <para>
 177       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 178       <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 179       <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 180       <citerefentry><refentrytitle>cat</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 181     </para>
 182   </refsect1>
 183 </refentry>