158 lines
6.4 KiB
HTML
158 lines
6.4 KiB
HTML
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<html>
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<head>
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<title>runsv(8) manual page</title>
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</head>
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<body bgcolor='white'>
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<a href='http://smarden.org/pape/'>G. Pape</a><br><a href='index.html'>runit</A><hr><p>
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<h2><a name='sect0'>Name</a></h2>
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runsv - starts and monitors a service and optionally an appendant log
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service
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<h2><a name='sect1'>Synopsis</a></h2>
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<b>runsv</b> <i>service</i>
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<h2><a name='sect2'>Description</a></h2>
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<i>service</i> must be a directory. <p>
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<b>runsv</b>
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switches to the directory <i>service</i> and starts ./run. If ./run exits and ./finish
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exists, <b>runsv</b> starts ./finish. If ./finish doesn’t exist or ./finish exits,
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<b>runsv</b> restarts ./run. <p>
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If ./run or ./finish exit immediately, <b>runsv</b> waits a
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second before starting ./finish or restarting ./run. <p>
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Two arguments are given
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to ./finish. The first one is ./run’s exit code, or -1 if ./run didn’t exit normally.
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The second one is the least significant byte of the exit status as determined
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by <i><b>waitpid</b>(2)</i>; for instance it is 0 if ./run exited normally, and the signal
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number if ./run was terminated by a signal. If <b>runsv</b> cannot start ./run for
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some reason, the exit code is 111 and the status is 0. <p>
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If the file <i>service</i>/down
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exists, <b>runsv</b> does not start ./run immediately. The control interface (see
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below) can be used to start the service and to give other commands to <b>runsv</b>.
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<p>
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If the directory <i>service</i>/log exists, <b>runsv</b> creates a pipe, redirects <i>service</i>/run’s
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and <i>service</i>/finish’s standard output to the pipe, switches to the directory
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<i>service</i>/log and starts ./run (and ./finish) exactly as described above for
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the <i>service</i> directory. The standard input of the log service is redirected
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to read from the pipe. <p>
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<b>runsv</b> maintains status information in a binary format
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(compatible to the daemontools’ <b>supervise</b> program) in <i>service</i>/supervise/status
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and <i>service</i>/log/supervise/status, and in a human-readable format in <i>service</i>/supervise/stat,
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<i>service</i>/log/supervise/stat, <i>service</i>/supervise/pid, <i>service</i>/log/supervise/pid.
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<h2><a name='sect3'>Control</a></h2>
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The named pipes <i>service</i>/supervise/control, and (optionally) <i>service</i>/log/supervise/control
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are provided to give commands to <b>runsv</b>. You can use <i><b>sv</b>(8)</i> to control the
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service or just write one of the following characters to the named pipe:
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<dl>
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<dt><b>u</b> </dt>
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<dd>Up. If the service is not running, start it. If the service stops, restart
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it. </dd>
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<dt><b>d</b> </dt>
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<dd>Down. If the service is running, send it a TERM signal, and then a
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CONT signal. If ./run exits, start ./finish if it exists. After it stops, do
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not restart service. </dd>
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<dt><b>o</b> </dt>
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<dd>Once. If the service is not running, start it. Do not
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restart it if it stops. </dd>
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<dt><b>p</b> </dt>
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<dd>Pause. If the service is running, send it a STOP
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signal. </dd>
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<dt><b>c</b> </dt>
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<dd>Continue. If the service is running, send it a CONT signal. </dd>
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<dt><b>h</b> </dt>
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<dd>Hangup.
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If the service is running, send it a HUP signal. </dd>
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<dt><b>a</b> </dt>
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<dd>Alarm. If the service
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is running, send it a ALRM signal. </dd>
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<dt><b>i</b> </dt>
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<dd>Interrupt. If the service is running,
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send it a INT signal. </dd>
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<dt><b>q</b> </dt>
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<dd>Quit. If the service is running, send it a QUIT signal. </dd>
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<dt><b>1</b> </dt>
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<dd>User-defined 1. If the service is running, send it a USR1 signal. </dd>
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<dt><b>2</b> </dt>
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<dd>User-defined 2. If the service is running, send it a USR2 signal. </dd>
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<dt><b>t</b> </dt>
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<dd>Terminate. If the service
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is running, send it a TERM signal. </dd>
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<dt><b>k</b> </dt>
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<dd>Kill. If the service is running, send
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it a KILL signal. </dd>
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<dt><b>x</b> </dt>
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<dd>Exit. If the service is running, send it a TERM signal,
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and then a CONT signal. Do not restart the service. If the service is down,
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and no log service exists, <b>runsv</b> exits. If the service is down and a log
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service exists, <b>runsv</b> closes the standard input of the log service, and
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waits for it to terminate. If the log service is down, <b>runsv</b> exits. This
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command is ignored if it is given to <i>service</i>/log/supervise/control. </dd>
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</dl>
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<p>
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Example:
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to send a TERM signal to the socklog-unix service, either do # sv term
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/service/socklog-unix<br>
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or<br>
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# printf t >/service/socklog-unix/supervise/control<br>
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<p>
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<i><b>printf</b>(1)</i> usually blocks if no <b>runsv</b> process is running in the service
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directory.
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<h2><a name='sect4'>Customize Control</a></h2>
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For each control character <i>c</i> sent to the control
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pipe, <b>runsv</b> first checks if <i>service</i>/control/<i>c</i> exists and is executable.
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If so, it starts <i>service</i>/control/<i>c</i> and waits for it to terminate, before
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interpreting the command. If the program exits with return code 0, <b>runsv</b>
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refrains from sending the service the corresponding signal. The command
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<i>o</i> is always considered as command <i>u</i>. On command <i>d</i> first <i>service</i>/control/<i>t</i>
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is checked, and then <i>service</i>/control/<i>d</i>. On command <i>x</i> first <i>service</i>/control/<i>t</i>
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is checked, and then <i>service</i>/control/<i>x</i>. The control of the optional log
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service cannot be customized.
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<h2><a name='sect5'>Signals</a></h2>
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If <b>runsv</b> receives a TERM signal, it
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acts as if the character x was written to the control pipe.
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<h2><a name='sect6'>Exit Codes</a></h2>
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<b>runsv</b>
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exits 111 on an error on startup or if another <b>runsv</b> is running in <i>service</i>.
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<p>
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<b>runsv</b> exits 0 if it was told to exit.
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<h2><a name='sect7'>See Also</a></h2>
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<i>sv(8)</i>, <i>chpst(8)</i>, <i>svlogd(8)</i>,
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<i>runit(8)</i>, <i>runit-init(8)</i>, <i>runsvdir(8)</i>, <i>runsvchdir(8)</i>, <i>utmpset(8)</i> <p>
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<i>http://smarden.org/runit/</i>
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<h2><a name='sect8'>Author</a></h2>
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Gerrit Pape <pape@smarden.org> <p>
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<hr><p>
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<a name='toc'><b>Table of Contents</b></a><p>
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<ul>
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<li><a name='toc0' href='#sect0'>Name</a></li>
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<li><a name='toc1' href='#sect1'>Synopsis</a></li>
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<li><a name='toc2' href='#sect2'>Description</a></li>
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<li><a name='toc3' href='#sect3'>Control</a></li>
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<li><a name='toc4' href='#sect4'>Customize Control</a></li>
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<li><a name='toc5' href='#sect5'>Signals</a></li>
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<li><a name='toc6' href='#sect6'>Exit Codes</a></li>
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<li><a name='toc7' href='#sect7'>See Also</a></li>
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<li><a name='toc8' href='#sect8'>Author</a></li>
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</ul>
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</body>
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</html>
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