Looking to Learn - mjhas::postfix

[Eric Hart]

Hey, how's it goin Puppet Masters?  I'm Puppet Novice over here.  I'm looking to up my game and so I'm working on setting up SMTP relay config for my hosts to fire off their local SMTP traffic to my one designated SMTP Relay host.  

I'm hoping to find someone who's familiar with the mjhas::postfix, as I've been digging into this module for a few hours now just gaining some understanding.  

Some basic questions to start.

class postfix::relay (

  $relayhost = 'myrelayserver.example.com',

  $masquerade_domains = $::hostname,

  $sender_hostname = $::fqdn,

) {

  include postfix

  postfix::config::maincfhelper { 'append_dot_mydomain': value => 'yes', }

  postfix::config::maincfhelper { 'myhostname': value => $sender_hostname, }

  postfix::config::maincfhelper { 'myorigin': value => $sender_hostname, }

  postfix::config::maincfhelper { 'mydestination': value => "${sender_hostname}, ${::hostname}", }

  postfix::config::maincfhelper { 'relayhost': value => $relayhost, }

  postfix::config::maincfhelper { 'mynetworks': value => '192.168.1.0/24', }

  postfix::config::maincfhelper { 'mailbox_size_limit': value => '0', }

  postfix::config::maincfhelper { 'masquerade_domains': value => $masquerade_domains, }

  postfix::config::maincfhelper { 'inet_interfaces': value => 'localhost', }

}

Taking a look at that code.  At the declaration of postfix::relay, when defining what I'd consider variables:

$masquerade_domains = $::hostname,

What's happening at the $::hostname?  Is that referencing a previous decleration within postfix or some other module?  Or is that a sort of universal reference?  

Thanks for your time.

Eric

[Denmat]

Hi,

That $::hostname is a fact.

https://docs.puppetlabs.com/puppet/latest/reference/lang_facts_and_builtin_vars.html

The $:: represents something in the top scope.

https://docs.puppetlabs.com/puppet/latest/reference/lang_scope.html#top-scope

It will resolve to the hostname of the node running to the postfix agent.

Den

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[Tony Thayer]

It will actually only return the part of the host name before the first period. $::fqdn will return the full host name.