Supervisor 3.0a1 Released

• Posted by Chris McDonough on August 16th, 2007

  Supervisor 3.0a1 is the latest release of supervisor .

  v3.0a1 is a major feature release version. Most of the features were commissioned by Maintainable Software. As well as contributing development funding, members of Maintainable have contributed a good deal of code to the supervisor codebase.

  The major new features in 3.0a1 as compared to the prior (2.2b1) release:

  • An event notification system. Supervisor now sends event
    notifications during normal operations for things like subprocess
    start and stop, supervisor startup and shutdown, and “process
    communications”. Users can write “event listeners” (which run as
    subprocesses) and subscribe them to these events selectively.
    Event listeners can perform arbitrary actions when an event
    notification occurs, such as sending an email, posting to an HTTP
    server, etc.
  • Subprocesses can emit data on stdout or stderr between special
    tokens which cause supervisor to perform a “process
    communications” event notification.
  • Process groups. Two types of process groups can be defined via
    the config file: “homogeneous” and “heterogeneous”. “Homogeneous”
    process groups are process groups comprised of very similar
    processes (e.g. many instances of an application server).
    “Heterogeneous” process groups are process groups comprised of
    potentially differing process types (e.g. “processes related to
    customer X”). Eventually it will be possible to start and stop
    process groups from within supervisorctl and the web interface
    (this feature is currently yet-to-be-implemented).
  • The XML-RPC interface API can be extended in arbitrary ways by
    registering new top-level namespace factories.
  • Stdout and stderr of processes may now be logged independently.
  • Improved web interface styling.

  As with any alpha release, the API and config file format is subject to change, so I wouldn’t recommend deploying this release to production.

  Supervisor 3.0a1 can be installed via “easy_install supervisor” if you’re using an internet-connected machine with setuptools installed into your Python.

  I’ve created a maillist for users of supervisor and as always, bug reports can be sent to the collector.

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