Here's what I'm trying to do, and I know there's a better way most likely 
involving exported resources, but I haven't done much with them before. 

I've got two types of nodes deploying custom software which Puppet is 
setting up for us. Slave nodes have a config file which gets deployed via 
template, and which needs to know the master node's fqdn. There is one 
master, and it varies by subnet. Any given subnet will only have one.

Right now, I'm defining the master in a .yaml file in our Hiera hierarchy 
so that each system on a subnet knows about the master. The twist is that 
the decision to deploy master or slave code is made through a custom fact 
which knows about the roles a particular system is supposted to have and 
installs the requisite software. So if no one tells me they're deploying a 
new subnet, all the slaves get deployed without a master and puppet has to 
play catch-up until I get it defined in hiera, and nothing works in the 
meantime.

Is the correct approach to have the config defined as an exported resource 
from the master, and have it get collected and realized on the slaves? 
Something like this:

master.pp:

@@masternode { $fqdn:
    # $subnet is a custom fact
    subnet => $subnet,
}

masternode.pp:

define masternode (Integer $subnet) {
    file  { '/path/to/config':
        content => template('module/config.erb')
        mode => '755',
   }
}

slave.pp:

Masternode<| subnet = $subnet |>

Does that look right, or am I completely off the rails?

Thanks!

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