Puppet users - Nov 2010 - Managing components in an high availability environment?

Hello Puppet Users,

we would like to create and/or modify resources in our environment
with the help of puppet. The problem is that the software components
may fail over from node A to node B. We are planning to write our own
modules for puppet but we have no idea how to handle the fail over
thing. Is there a popular pattern for s.th. like this? S.th. like: if
the component is not on node A then look on node B and then if this
fails report a failure.

Kind regards
Maciej

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Maciej Skrzetuski <m.skrzetuski@gmail.com> writes:
> we would like to create and/or modify resources in our environment with the
> help of puppet. The problem is that the software components may fail over
> from node A to node B. We are planning to write our own modules for puppet
> but we have no idea how to handle the fail over thing. Is there a popular
> pattern for s.th. like this? S.th. like: if the component is not on node A
> then look on node B and then if this fails report a failure.
I wrote a custom fact to determine which node in our HA database pair was
currently active, and used:

  if $database_blah_blah == ''active'' {
    # manage the stuff here
  }

For most of the resources, though, I worked fairly hard to make sure that all
the administrative changes could apply on *both* nodes, so that I
didn''t have
to introduce that sort of dependency.

This is, in my experience, the far better (but harder) way to achieve the
results.


Writing custom facts is actually pretty trivial, FWIW, so doesn''t add
too much
overhead to the whole process.  (At least, nothing notable compared to the
effort of getting an HA system in the first place. ;)

Regards,
        Daniel
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