# File lib/deltacloud/drivers/rhevm/rhevm_driver.rb, line 77
  def realms(credentials, opts=nil)
    client = new_client(credentials)
    realm_arr = []
    safely do
      clusters = client.clusters
      clusters.each do |r|
        d = client.datacenters(:id => r.datacenter.id).first
        realm_arr << convert_realm(r, d)
      end
    end
    realm_arr = filter_on( realm_arr, :id, opts )
    realm_arr
  end