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