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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2014-12-05 22:26:11 +0000 |
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| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2014-12-05 22:26:11 +0000 |
| commit | 90b12bd71bb9fc79a4640b9112c13ef529d0196a (patch) | |
| tree | 523b3f4ee2969e7a729bab2ba749c4b924ae62af /doc/s6-svc.html | |
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diff --git a/doc/s6-svc.html b/doc/s6-svc.html new file mode 100644 index 0000000..72f0776 --- /dev/null +++ b/doc/s6-svc.html @@ -0,0 +1,104 @@ +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>s6: the s6-svc program</title> + <meta name="Description" content="s6: the s6-svc program" /> + <meta name="Keywords" content="s6 command s6-svc supervise command service" /> + <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> --> + </head> +<body> + +<p> +<a href="index.html">s6</a><br /> +<a href="http://skarnet.org/software/">Software</a><br /> +<a href="http://skarnet.org/">skarnet.org</a> +</p> + +<h1> The s6-svc program </h1> + +<p> +s6-svc sends commands to a running <a href="s6-supervise.html">s6-supervise</a> +process. In other words, it's used to control a supervised process; among +other benefits, it allows an administrator to send signals to daemons without +knowing their PIDs, and without using horrible hacks such as .pid files. +</p> + +<h2> Interface </h2> + +<pre> + s6-svc [ -abqhkti12fFpcoduxO ] <em>servicedir</em> +</pre> + +<p> +s6-svc sends the given series of commands to the +<a href="s6-supervise.html">s6-supervise</a> process monitoring the +<em>servicedir</em> directory, then exits 0. It exits 111 if it cannot send +a command, or 100 if no s6-supervise process is running on <em>servicedir</em>. +</p> + +<h2> Options </h2> + +<ul> + <li> <tt>-a</tt> : send a SIGALRM to the supervised process </li> + <li> <tt>-b</tt> : send a SIGABRT to the supervised process </li> + <li> <tt>-q</tt> : send a SIGQUIT to the supervised process </li> + <li> <tt>-h</tt> : send a SIGHUP to the supervised process </li> + <li> <tt>-k</tt> : send a SIGKILL to the supervised process </li> + <li> <tt>-t</tt> : send a SIGTERM to the supervised process </li> + <li> <tt>-i</tt> : send a SIGINT to the supervised process </li> + <li> <tt>-1</tt> : send a SIGUSR1 to the supervised process </li> + <li> <tt>-2</tt> : send a SIGUSR2 to the supervised process </li> + <li> <tt>-p</tt> : send a SIGSTOP to the supervised process </li> + <li> <tt>-c</tt> : send a SIGCONT to the supervised process </li> + <li> <tt>-o</tt> : once. Equivalent to "-uO". </li> + <li> <tt>-d</tt> : down. If the supervised process is up, send it +a SIGTERM and a SIGCONT. Do not restart it. </li> + <li> <tt>-u</tt> : up. If the supervised process is down, start it. +Automatically restart it when it dies. </li> + <li> <tt>-x</tt> : exit. When the service is asked to be down and +the supervised process dies, supervise will exit too. This command should +normally never be used on a working system. </li> + <li> <tt>-O</tt> : Once at most. Do not restart the supervised process +when it dies. If it is down when the command is received, do not even start +it. </li> + <li> <tt>-f</tt>, <tt>-F</tt> : unused for now. </li> +</ul> + +<h2> Usage examples </h2> + +<pre> s6-svc -h /service/httpd </pre> +<p> + Send a SIGHUP to the process represented by the <tt>/service/httpd</tt> +service directory. Traditionally, this makes web servers reload their +configuration file. +</p> + +<pre> s6-svc -t /service/sshd </pre> +<p> + Kill (and automatically restart, if the wanted state of the service is up) +the process represented by the <tt>/service/sshd</tt> service directory - +typically the sshd server. +</p> + +<pre> s6-svc -d /service/ftpd </pre> +<p> + Take down the ftpd server. +</p> + +<pre> s6-svc -a /service/httpd/log </pre> +<p> + Send a SIGALRM to the logger process for the httpd server. If this logger +process is <a href="s6-log.html">s6-log</a>, this triggers a log rotation. +</p> + +<h2> Internals </h2> + +<p> +s6-svc writes control commands into the <tt><em>servicedir</em>/supervise/control</tt> +FIFO. A s6-supervise process running on <em>servicedir</em> will be listening to this FIFO, +and will read and interpret those commands. +</p> + +</body> +</html> |