Puppet users - Apr 2012 - Require => Package from a different server

Hi.

I have  to install a client/server app. The server end is easily set
up but I need a puppet module that ensures a package is installed on a
managed node only if the server package has already been installed on
a different server.

Is there a way to do this?
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Hi,

To my knowledge there is no simple way. I know there has been talk of this
previously on the list so you can search that for other answers.

That said a possibility is that you can have a custom fact that checks for an
open port on the server. If it responds set it to true. There are obvious issues
with this and may not prove to be reliable.

The main thing here is that the client should have the package or it
shouldn''t.  It''s not good practice to define the current state
of a node depending on the current state of another. That is, system
configuration should be independent of each other''s state.

You can also look at orchestration tools like MCollective that might help you
get your end goal.

Cheers,
Den

On 01/05/2012, at 0:14, Phil Cooper <Phil.Cooper@ammeon.com> wrote:
> Hi.
> 
> I have  to install a client/server app. The server end is easily set
> up but I need a puppet module that ensures a package is installed on a
> managed node only if the server package has already been installed on
> a different server.
> 
> Is there a way to do this?
> -- 
> This email and any files transmitted with it are confidential and intended 
> solely for the use of the individual or entity to whom they are addressed. 
> If you have received this email in error please notify the system manager. 
> This message contains confidential information and is intended only for the
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> disseminate, distribute or copy this e-mail.
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> 
> 
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>> I have  to install a client/server app. The server end is easily set
>> up but I need a puppet module that ensures a package is installed on a
>> managed node only if the server package has already been installed on
>> a different server.
>>
>> Is there a way to do this?
As others have said, it''s tricky - Could you maybe try something funky 
with exported resources here? (this is untested and pretty hacky :P )

# server

define clientenabled () {
   @@package { "client":
     ensure  => latest,
   }
}

package { "server":
   ensure => latest,
}

clientenabled { "foo":
   require => Package[''server'']
}


# client

Package <<| title == "client" |>>


Depends on the exact behavior you want, this may be completely the wrong 
approach - this will just mean that the client will not get installed 
until Puppet has been run and installed the server package first - it 
wont actually do the orchestration for you though


-- 
Craig Dunn | http://www.craigdunn.org
Yahoo/Skype: craigrdunn | Twitter: @crayfishX

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