peer.pp

# type gluster::peer
# Verifies a peer in the Gluster cluster
#
define gluster::peer(
  $hostname,
) {
  $peergrep     = regsubst($hostname, '(\.)', '\\.', 'G')

  # Do unless current system is peer
  if ( $hostname != $::fqdn ) {
    exec { "gluster probe $hostname":
      path        => '/bin:/sbin:/usr/bin:/usr/sbin',
      onlyif      => "! (gluster peer status | egrep -q '$peergrep')"
      provider    => shell,
    }
  }

  Service <| tags == 'gluster' |>  ->
  Exec ["gluster probe $hostname"]
}

prune.pp

# peer/prune.pp
# class gluster::peer::prune
# Prunes all not-peers in the cluster
#
class gluster::peer::prune {
  $peers        = $::gluster::peers
  $peergrep     = regsubst(join($peers, "|"), '(\.)', '\\.', 'G')

  # egrep -v '(peer-1\.example\.com|peer-2\.example\.com)'
  exec { "gluster peer status | egrep -v '($peergrep)' | awk '/^Hostname:/{print $2}' | xargs -n 1 gluster peer detach":
    path        => '/bin:/sbin:/usr/bin:/usr/sbin',
    provider    => shell,
  }
}