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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/ucspilogd.html | |
| download | s6-90b12bd71bb9fc79a4640b9112c13ef529d0196a.tar.xz | |
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diff --git a/doc/ucspilogd.html b/doc/ucspilogd.html new file mode 100644 index 0000000..1b06335 --- /dev/null +++ b/doc/ucspilogd.html @@ -0,0 +1,94 @@ +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>s6: the ucspilogd program</title> + <meta name="Description" content="s6: the ucspilogd program" /> + <meta name="Keywords" content="s6 command ucspilogd log logging UCSPI" /> + <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> --> + </head> +<body> + +<p> +<a href="../">s6</a><br /> +<a href="http://skarnet.org/software/">Software</a><br /> +<a href="http://skarnet.org/">skarnet.org</a> +</p> + +<h1> The <tt>ucspilogd</tt> program </h1> + +<p> + <tt>ucspilogd</tt> acts as a filter, converting syslog facility +numbers and alert levels into names. +</p> + +<h2> Interface </h2> + +<pre> + ucspilogd [ <em>var</em> ... ] +</pre> + +<ul> + <li> ucspilogd reads a stream of syslog-like messages on stdin. +Those messages can be newline-terminated or null-terminated. </li> + <li> For every line it reads: if it has been given <em>var</em> +arguments, it writes the value of every <em>var</em> environment +variable, followed by a colon and a space. </li> + <li> If the line begins with a syslog facility number and/or +alert level in the syslog format, it converts them into a +human-readable name in the syslogd fashion. </li> + <li> It then writes the processed line to stdout. </li> +</ul> + +<h2> Common use </h2> + +<p> + You can emulate the whole <em>syslogd</em> behaviour by combining the following +components: +</p> + +<ul> + <li> A Unix stream super-server such as +<a href="http://skarnet.org/software/s6-networking/s6-ipcserver.html">s6-ipcserver</a> +listening to the Unix domain socket <tt>/dev/log</tt>, to connect to +the kernel log-reading interface. </li> + <li> <tt>ucspilogd</tt> running under that super-server, to read the +logs and perform adequate transformations. </li> + <li> A logger such as +<a href="s6-log.html">s6-log</a> +to store the logs into the filesystem. </li> + <li> A supervision mechanism such as s6, +to ensure ease of use and reliability of the whole chain. </li> +</ul> + +<p> + The resulting suite of programs is still smaller, and way more reliable, +than a standard <em>syslogd</em>. +</p> + +<p> + In the <tt>examples/ROOT/img/services-local/syslogd-linux</tt> subdirectory of the s6 package, you will +find a suitable ucspilogd <a href="servicedir.html">service directory</a>. +The run scripts are written in the +<a href="http://skarnet.org/software/execline/">execline</a> +language. +</p> + +<h2> Using <tt>ucspilogd</tt> as a <em>klogd</em> replacement </h2> + +<p> + Certain Unix kernels offer a nice interface to the kernel logs. +For instance, the Linux kernel provides the <tt>/proc/kmsg</tt> fake +file, that can be opened and read like a normal file, excepts that +it gives the kernel logs when they are available and blocks otherwise. +You can use <tt>ucspilogd</tt> to process data from those interfaces. +</p> + +<p> + The <tt>examples/ROOT/img/services-local/klogd-linux</tt> subdirectory of the s6 package +is a <a href="servicedir.html">service directory</a> providing such a <em>klogd</em> service +for Linux, using the <tt>/proc/kmsg</tt> interface. +</p> + +</body> +</html> |