All,
We are looking to implement Puppet as part of our config
management/provisioning system. I've read a lot of wiki pages, all the
Puppet docs, and the forums and mailing list archives. So far, I'm
pretty comfortable with most of puppet, but the one area that I am a bit
confused about is how to do node-level module version control.
Basically, one of the key requirements is that I be able to know exactly
which version of a module supposed to be applied to a node. We are not
going to run Puppet in "auto update" mode out of cron, but instead push
changes as part of our config management work-flow. As such, I need to
be able to target a specific version of a module to a specific host, or
group of hosts. I know that using an external node script is probably
the way to go here, and I'm comfortable with that. What I don't know is
how to manage the life-cycle.
For example, I have a module, foo at v1. It uses two other modules, bar
v2, and zoom v3. I apply that to the nodes I care about, and everything
is fine. Then I get updates for foo, and bar. That bumps them to foo v2
and bar v3. But bar is also used by several other modules, and I don't
want to have them affected by the changes to bar yet. I only want to
apply the changes to the specific nodes that need them.
To further complicate all of this, I need to be able to rebuild a
machine quickly. That means that I need to be able to reimage the host,
and have puppet return it to the same exact state as when it died. We
also usually role out changes slowly, updating hosts one at a time in a
group, sometimes letting them "burn in" for a day or so to ensure that
the changes won't have any production impact that we didn't catch in QA
due to things like load, user population, etc. That means that I need to
be careful, since during this "burn in period", I still have to be able
to handle the "reimage the host" problem.
I know about environments, and I see how they might help. I also have
looked at some of the info about using VCS-based options, like using git
or svn or something like that. What I'm mostly looking for is what
others are doing? How have others handled this problem? Are there
solutions I don't know about that I can leverage before I go and build
on my own?
Any insights or help is greatly appreciated.
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