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Langue: en

Version: Copyright 2005 Robert G. Brown (ubuntu - 07/07/09)

Section: 1 (Commandes utilisateur)


wulfweb - A script to create an html table of cluster node statistics


wulfweb [-d delay] [-f wulfhosts] [-i include] [-p path] [-t type] [-h] [-v level] filename


  filename (required) is the name of the web page created (e.g. mycluster.html)
  -d delay sets the delay used for both wulflogger and page updates
  -f wulfhosts to specify a particular wulfhosts file
  -i include file (which must contain html intended to go after <html> and before the table in the created web page).
  -t type to control wulflogger "type" of display.
  -h displays help/usage
  -v level controls verbosity and debugging output


wulfweb is a script that creates a web page containing an optional inclusion (described in detail below) followed by an html table formatted to contain automatically updated cluster statistics collected from xmlsysd's running on the cluster nodes by wulflogger. Note that wulflogger is therefore required by the wulfweb program.

A typical invocation might be:

$ wulfweb -f /usr/share/wulfweb/wulfhosts -d 60 -t 1 \
     -i myheader.html mycluster.html &

to create a page with the header myheader.html in front of the "load averages" table that auto-refreshes every 60 seconds. The cluster is described in the wulfhosts file (see wulfstat(1) or wulflogger(1) for details). Run in the background, wulfweb will keep this page current indefinitely.


The included file must contain valid html for material that you might wish to precede the table. It can be empty (or no include file may be given on the command line) in which case the raw table and the <meta> tag that causes automatic refresh are the sole contents of the output file.

The included header file can be as fancy as you like, but I'd strongly urge that if you want to embed the tables in a complex document you consider using php and including the table in a php-generated page, as otherwise I think you'll find this simple inclusion mechanism limiting.

Be warned! Check the resulting documents produced carefully for errors! The most that wulfweb can do is produce the table (hopefully correctly). Obviously it cannot be blamed for bad html in any inclusion.

The following is an example of a reasonable inclusion that should work:

   <title>MyCluster Stats</title>


 <h2>MyCluster Load Average</h2>



The following display types are supported by wulflogger:

  0 - a "vmstat-like" display of stats from all cluster hosts.  Probably
      the most useful single display.
  1 - load average only
  2 - memory utilization (similar to running "free" on each host)
  3 - network rates
  4 - time displays system clocks, uptime, cpu type and clock
  5 - pids interface for monitoring running distributed tasks.
  6 - pids interface for monitoring running distributed tasks with
      full command line displayed.

The pids interface (with or without the full command line displayed) is a bit quirky. It will generally ignore root-owned tasks, for example, presuming that the tool is intended to monitor userspace applications. There exist wulfhosts controls for these properties; eventually they will likely be controllable at the command line of this tool as well.


xmlsysd(8), wulfstat(1), wulflogger(1)


Trust No One. Your Mileage May Vary. Use With Caution. Void Where Prohibited. Use Your Head. I am NOT RESPONSIBLE for losses you sustain based on the use of this software, which comes with NO WARRANTY concerning suitability for any purpose and in fact may be quite useless and misleading.

You Have Been Warned.


Blessings on any and all who've ever contributed to the perl programming language, from its inventors on down.
Mental et
Béret plat.
-- Rapilly, Robert