How to handle master slave configuration via Puppet?

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Haani Niyaz

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Nov 17, 2015, 3:40:49 AM11/17/15

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I'd like to get an idea on the recommended practice in scenarios where you have a cluster of nodes setup in master/slave(s) mode which needs specific configuration files.

The following setup includes writing a custom fact to retrieve a value from the hostname and then comparing it against a pre-determined host value set in hiera. i.e:

# list of hosts
host01,host02,host03

# custom fact
rank: 01,02,03

# set in hiera
master:01

if $::rank == $master {
  class { 'solr::conf::master' : } 
 } else{
  class { 'solr::conf::slave' :
   master_fqdn => $master_fqdn,
 }

}

I understand that if the master goes down a manual hiera update is required to set the new hiera master value.