doc/dependencies.html


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<title>runit -service dependencies</title>
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<a href="http://smarden.org/pape/">G. Pape</a><br>
<a href="index.html">runit</a><br>
<hr>
<h1>runit - service dependencies</h1>
<hr>
<i>runit</i>'s service supervision resolves dependencies for service daemons
designed to be run by a supervisor process automatically.
The service daemon (or the corresponding <tt>run</tt> scripts) should behave
as follows:
<ul>
  <li>before providing the service, check if all services it depends on are
  available.
  If not, exit with an error, the supervisor will then try again.
  <li>write all logs through <i>runit</i>'s logging facility.
  The <a href="runsv.8.html">runsv</a> program takes care that all logs for
  the service are written safely to disk.
  Therefore there's no need to depend on a system logging service.
  <li>optionally when the service is told to become down, take down other
  services that depend on this one after disabling the service.
</ul>
If you want to run service daemons that do not support service supervision
as described above, please refer to
<a href="http://smarden.org/pape/djb/daemontools/noinit.html">this page</a>
about service dependencies I wrote some time ago.
<hr>
<address><a href="mailto:pape@smarden.org">
Gerrit Pape &lt;pape@smarden.org&gt;
</a></address>
<small>$Id$</small>
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