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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2023-01-09 11:09:14 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska@appnovation.com> | 2023-01-09 11:09:14 +0000 |
| commit | 09750ce3525129a676dec4f579aea3ad2eca1b19 (patch) | |
| tree | acae6b5f47914d7ed85bbb8fe9780ed34a85cfd0 /doc/s6-instance-create.html | |
| parent | 191b46491407632f2431c46eab97dbf5543fa26d (diff) | |
| download | s6-09750ce3525129a676dec4f579aea3ad2eca1b19.tar.xz | |
Add instances implementation (still needs testing)
Signed-off-by: Laurent Bercot <ska@appnovation.com>
Diffstat (limited to 'doc/s6-instance-create.html')
| -rw-r--r-- | doc/s6-instance-create.html | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/doc/s6-instance-create.html b/doc/s6-instance-create.html new file mode 100644 index 0000000..c81dfe4 --- /dev/null +++ b/doc/s6-instance-create.html @@ -0,0 +1,92 @@ +<html> + <head> + <meta name="viewport" content="width=device-width, initial-scale=1.0" /> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>s6: the s6-instance-create program</title> + <meta name="Description" content="s6: the s6-instance-create program" /> + <meta name="Keywords" content="s6 command s6-instance-create instance dynamic instantiation instanced services creation s6-svlink" /> + <!-- <link rel="stylesheet" type="text/css" href="//skarnet.org/default.css" /> --> + </head> +<body> + +<p> +<a href="index.html">s6</a><br /> +<a href="//skarnet.org/software/">Software</a><br /> +<a href="//skarnet.org/">skarnet.org</a> +</p> + +<h1> The s6-instance-create program </h1> + +<p> +s6-instance-create creates a new instance of a currently supervised +<a href="instances.html">instanced service</a>. +</p> + +<h2> Interface </h2> + +<pre> + s6-instance-create [ -d | -D ] [ -P ] [ -f ] [ -t <em>timeout</em> ] <em>servicedir</em> <em>name</em> +</pre> + +<ul> + <li> s6-instance-create expects a running, supervised +<a href="instances.html">instanced service</a> in <em>servicedir</em>. +This service typically has been created by linking the result of an +<a href="s6-instance-maker.html">s6-instance-maker</a> invocation into +an existing <a href="scandir.html">scan directory</a>. </li> + <li> s6-instance-create creates a new instance of that service, named +<em>name</em>. Depending on the given options, it may start it +immediately, or keep it down until a later +<a href="s6-instance-control.html">s6-instance-control</a> invocation. </li> + <li> It waits for the new instance to be ready to take commands from +<a href="s6-instance-control.html">s6-instance-control</a>. </li> + <li> It exits 0. </li> +</ul> + +<h2> Exit codes </h2> + +<ul> + <li> 0: success </li> + <li> 99: timeout while waiting for the instance supervisor to start </li> + <li> 100: wrong usage </li> + <li> 111: system call failed </li> +</ul> + +<h2> Options </h2> + +<ul> + <li> <tt>-d</tt> : down. The instance supervisor will be started, but the instance +itself will remain down. Any <tt>down</tt> file for the instance will be +deleted. By default, if neither the <tt>-d</tt> nor <tt>-D</tt> options have +been given, the supervisor auto-starts the instance as soon as it runs. </li> + <li> <tt>-D</tt> : down, and stay down. The instance supervisor will be started, +but the instance itself will remain down. A <tt>down</tt> file +will be created for the instance. By default, if neither the <tt>-d</tt> nor <tt>-D</tt> options have +been given, the supervisor auto-starts the instancece as soon as it runs. </li> + <li> <tt>-P</tt> : public. Everyone will be able to subscribe to the +instance supervisor's notification. By default, only processes running with the same gid +as the instanced service can subscribe to it. </li> + <li> <tt>-f</tt> : force permissions. You should never need to use this +option, it is only there for testing purposes. </li> + <li> <tt>-t <em>timeout</em></tt> : if the instance supervisor has not started +after <em>timeout</em> milliseconds, s6-instance-create will print a message +to stderr and exit 99. By default, <em>timeout</em> is 0, which means no time +limit. </li> +</ul> + +<h2> Notes </h2> + +<ul> + <li> s6-instance-create is similar to +<a href="s6-svlink.html">s6-svlink</a>, because it uses the same underlying +library functions. Under the hood, an instance is a regular service running +on a supervision tree that is specific to the instanced service, and +s6-instance-create adds a service directory to that tree and ensures it gets +supervised. </li> + <li> If the template for the service is logged, then s6-instance-create will +wait until supervisors have been spawned for both the instance and its logger. </li> +</ul> + +</body> +</html> |