Puppet users - Mar 2008 - Matching multiple nodes with a regular expression

Hello,

  I''m setting up puppet on various clusters (tomcat, mysql, tomcat
+cocoon, etc) of computers, each of which has a hostname consisting of
the cluster type and a unique id (e.g. tc-dev-1, mysql-stg-3, etc).
I''ve been merrily adding each node by hand to puppet but being
naturally lazy I wondered if this could be done with a regular
expression instead, something along the lines of:

nodematch "tc-liv-\d+.*?\.ac\.uk" { .... }

which would then map all matching nodes to that default configuration.
Adding the code to do this doesn''t seem to be a unsurmountable
problem, but I''ve only just started reading through the source so
perhaps I''m wrong. Does this seem worthwhile?, or is there a much
easier way to do this that I''ve missed?.

thanks,

Richard.
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Richard Palmer wrote:
| Hello,
|
|   I''m setting up puppet on various clusters (tomcat, mysql, tomcat
| +cocoon, etc) of computers, each of which has a hostname consisting of
| the cluster type and a unique id (e.g. tc-dev-1, mysql-stg-3, etc).
| I''ve been merrily adding each node by hand to puppet but being
| naturally lazy I wondered if this could be done with a regular
| expression instead, something along the lines of:
|
| nodematch "tc-liv-\d+.*?\.ac\.uk" { .... }
|
| which would then map all matching nodes to that default configuration.
| Adding the code to do this doesn''t seem to be a unsurmountable
| problem, but I''ve only just started reading through the source so
| perhaps I''m wrong. Does this seem worthwhile?, or is there a much
| easier way to do this that I''ve missed?.

I think it might be harder than you think but I suspect Luke would
welcome any contribution in this arena.

But you can do something similar now using external nodes:

http://reductivelabs.com/trac/puppet/wiki/ExternalNodes

Regards

James Turnbull

- --
James Turnbull (james@lovedthanlost.net)
- --
Author of:
- - Pulling Strings with Puppet
(http://www.amazon.com/gp/product/1590599780/)
- - Pro Nagios 2.0
(http://www.amazon.com/gp/product/1590596099/)
- - Hardening Linux
(http://www.amazon.com/gp/product/1590594444/)

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Hi James,

On Tue, Mar 18, 2008 at 9:32 AM, James Turnbull <james@lovedthanlost.net>
wrote:
>
>  I think it might be harder than you think but I suspect Luke would
>  welcome any contribution in this arena.
I''ll give it a try.
>
>  But you can do something similar now using external nodes:
>
>  http://reductivelabs.com/trac/puppet/wiki/ExternalNodes
Aha. That''ll also solve the problem. The wiki seems to guard its
secrets jealously.

many thanks,

Richard.

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