Puppet users - Nov 2012 - Puppet - Postfix - How-To edit generic.db

New-ish to Puppet.  I''m just getting beyond the basics, now.

Got a postfix module defined.  But there is a wrinkle: the server needs to 
send mail from root as root@domain.com not root@hostname.domain.com

Because our service desk accepts tickets from servers BUT the counts as 
''spam'' anything NOT from domain.com.

This is easy with postfix:

edit /etc/postfix/generic - add "root@hostname.domain.com 
hostname@domain.com"
$ postmap /etc/postfix/generic
restart service postfix

How do I tell puppet do this?

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In regard to: [Puppet Users] Puppet - Postfix - How-To edit generic.db,...:
> New-ish to Puppet.  I''m just getting beyond the basics, now.
>
> Got a postfix module defined.  But there is a wrinkle: the server needs to
> send mail from root as root@domain.com not root@hostname.domain.com
So the big question is whether this config needs to be applied to *all*
the systems where you might run postfix, or whether it''s specific to
one particular system or set of systems.
> Because our service desk accepts tickets from servers BUT the counts as
> ''spam'' anything NOT from domain.com.
>
> This is easy with postfix:
>
> edit /etc/postfix/generic - add "root@hostname.domain.com
> hostname@domain.com"
You need to modify a file, so you''ll want to have a file resource
defined somewhere.  Are there other settings in that file you typically
customize?  If so, you may want the source for the file to be a
template().  If not, there are other ways you might handle it.

So, the file resource is going to look something like

 	file { ''/etc/postfix/generic'':
 		ensure => file,
 		owner  => ''some_user'',
 		group  => ''some_group'',
 		mode   => ''0somethingsomethingsomething'',
 		source => yet_to_be_determined,
 		notify => Exec[''postmap-generic''],
 	}

The real question is what goes in the "yet_to_be_determined" area for
the source.  It could be a template

 	source => template(''postfix/generic.erb''),

or perhaps it''s a list of files (first one that matches is used):

 	source => [
 		"puppet:///modules/postfix/generic.${::fqdn}",
 		''puppet:///modules/postfix/generic'',
 	],

Determining how you pick the source for the file is going to be the
most difficult part of this, and it depends on how much customization
you need to do.
> $ postmap /etc/postfix/generic
For that, you need an exec resource to execute your command after the file
is modified:

 	exec { ''postmap-generic'':
 		cwd         => ''/etc/postfix'',
 		path        => ''/bin:/usr/bin:/sbin:/usr/sbin'',
 		command     => ''postmap generic'',
 		refreshonly => true,
 		notify      => Service[''postfix''],
 	}
> restart service postfix
 	service { ''postfix'':
 		ensure => running,
 		enable => true,
 	}

Tim
-- 
Tim Mooney                                             Tim.Mooney@ndsu.edu
Enterprise Computing & Infrastructure                  701-231-1076 (Voice)
Room 242-J6, IACC Building                             701-231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164

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