Puppet users - Jun 2012 - cross server dependancies

I have an application package that needs to be installed on certain 
application servers but before it can be installed, database access has to 
be setup on a database server. 

I have figured out how to export a resource on the app server that gets 
collected and realized on the database server, but I cannot figure out how 
to make the package on the app server depend on the exported resource that 
gets realized on the database server. 

I have tried something like this:

@@numerex_percona::database_grant { $::mysql_hostname:
>             user => ''root'',
>             password => $::mysql_server_root_password,
>             host => $::fqdn,
>            before => Package[''ublipgw''],
> }

But that doesn''t work because Package[''ublipgw''] is
not on the server where
the database_grant is realized, but on the server where it is exported. 
What is the best way to handle a situation like this? 

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On 15.06.2012 21:19, Byron Appelt wrote:
> I have an application package that needs to be installed on certain
> application servers but before it can be installed, database access has
> to be setup on a database server.
>
> I have figured out how to export a resource on the app server that gets
> collected and realized on the database server, but I cannot figure out
> how to make the package on the app server depend on the exported
> resource that gets realized on the database server.
>
> I have tried something like this:
>
>     @@numerex_percona::database_grant{ $::mysql_hostname:
>     user => ''root'',
>     password => $::mysql_server_root_password,
>     host => $::fqdn,
>     before => Package[''ublipgw''],
>     }
>
>
> But that doesn''t work because Package[''ublipgw'']
is not on the server
> where the database_grant is realized, but on the server where it is
> exported. What is the best way to handle a situation like this?
Puppet doesn''t support cross-node relationships. You''ll have
to manage
that on a similar level as you are managing maintenance windows, that is 
by scheduling when changes to your manifests are actually applied to 
your nodes.

On a related note you need to make sure that the database_grant is able 
to manage its state without the other server being available, else you 
will run into troubles when you have transient problems with the other 
server or network later. In the simplest case a re-try might be 
sufficient, but, depending on your actual situation, might also be the 
worst thing that could happen.



Best Regards, David

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