Puppet users - Oct 2009 - Tomcat Virtual-Host Entries - Dynamically Generating an Array with No Repeats from Different Classes

I''m using Puppet to manage my Tomcat configuration, including my
server.xml
file and a potentially shifting set of war files depending on the node.
I''m also using Tomcat''s virtual-host capability, which
involves adding a
<Host/> element in the server.xml file for each virtual-host I wish to
activate.  The tricky bit is that each webapp/war has a different, possibly
overlapping, virtual-host.  Since I''d rather not list EVERY potential
virtual-host in the server.xml file, I''d like some way of collecting
the set
of activated virtual-host names and then generating my server.xml file with
the appropriate entries.  I''m not sure how to do this.

One idea is to have a master variable of virtual-host names: something like
$Tomcat::hosts.  I could use Puppet''s variable appending feature to
extend
the set of hosts:

  $Tomcat::hosts += [''some.host.name'']

The only issue with this is that it could lead to duplicate entries if two
webapps have the same virtual-host (a possibility).

Is this maybe the purpose of virtual resources?  How might I go about using
them here?

I don''t really have any good ideas on this, so any help is appreciated.

Thanks,
Brian

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Hi Brian,

you are definitely on the right track with virtual resources. Here is what I
recommend.

1. Create virtual resources that specify all of the possibly virtual host
entries as files
2. use realize to specify which file snippets should be used by which
classes.
3. In the tomcat module, have an exec resource that appends all of the file
snippets together in whatever order is required for server.xml.
4. The file snippets should notify the tomcat concat exec when one of them
changes.

Here is example code from volcane that demonstrates how you can manage these
file snippets.

http://nephilim.ml.org/~rip/puppet/concatfile/concat_file.pp

Hope this helps,

Dan

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