Puppet users - Dec 2008 - Looking up information from the config...

Is there a way, in a puppet config, to query the current nodes config
elements and use them in a template? My specific case is a JBOSS
configuration with multiple instances on one server installation.  I
have the server configured as a class (with unpacking the zip file and
making the server level changes), then each instance in a definition
(making a copy of the default instance config and changing instance
specific settings).

The class needs to be able to look at the expected instances and make
some server level config changes (like one line in a common config for
each instance).

Is this possible?

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Hi Jeffrey,

I''m also new to puppet and currently using the ralsh to query
packages, services.
Hope others can also share their own info. :)

Cheers,
Rodney



On Dec 5, 6:41 am, Jeffrey Hulten <jhul...@gmail.com>
wrote:
> Is there a way, in a puppet config, to query the current nodes config
> elements and use them in a template? My specific case is a JBOSS
> configuration with multiple instances on one server installation.  I
> have the server configured as a class (with unpacking the zip file and
> making the server level changes), then each instance in a definition
> (making a copy of the default instance config and changing instance
> specific settings).
>
> The class needs to be able to look at the expected instances and make
> some server level config changes (like one line in a common config for
> each instance).
>
> Is this possible?
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On Thu, Dec 4, 2008 at 4:41 PM, Jeffrey Hulten <jhulten@gmail.com>
wrote:
>
> Is there a way, in a puppet config, to query the current nodes config
> elements and use them in a template? My specific case is a JBOSS
> configuration with multiple instances on one server installation.  I
> have the server configured as a class (with unpacking the zip file and
> making the server level changes), then each instance in a definition
> (making a copy of the default instance config and changing instance
> specific settings).
>
This would make a lot more sense to build a JBOSS package to and use
the package provider to deploy the software. It will also generally be
faster. What exactly do you mean by "node config elements"? you can
use any of the facts in the templates, and you can setup variables in
the node descriptions to be used in templates. Instead of copying the
default instance config each time you should make it a template, and
then have each node facts or variables fill in the template when when
the node is configured.
> The class needs to be able to look at the expected instances and make
> some server level config changes (like one line in a common config for
> each instance).
This may be the hardest part. Puppet does not really do one lin
in-place changes well. You might look at Aegis (spelling?) Len for
doing that, or you could see if the simple text edit defines will work
for you from the wiki.
>
> Is this possible?
 It will take a bit of work.

Evan

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On Thu, Dec 4, 2008 at 5:41 PM, Jeffrey Hulten <jhulten@gmail.com> wrote:
>
> Is there a way, in a puppet config, to query the current nodes config
> elements and use them in a template? My specific case is a JBOSS
> configuration with multiple instances on one server installation.  I
> have the server configured as a class (with unpacking the zip file and
> making the server level changes), then each instance in a definition
> (making a copy of the default instance config and changing instance
> specific settings).
>
> The class needs to be able to look at the expected instances and make
> some server level config changes (like one line in a common config for
> each instance).
>
> Is this possible?

I had a similar problem with Tomcat, and I decided to tell the class what
instances to expect separately.  Before including the class in each node, I
provided a list variable containing the domain names of virtual hosts I had
defined.  The main server.xml template iterated over them and added XML
Entity includes pointing to the files that were created by my puppet
definition for each virtual host.

node www.example.com {
    $vhosts = [ "www.example.com", "www.example.net" ]
    include tomcat5
}

class tomcat5 {

}

-- 
Thanks,
Jared Brothers

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