# File lib/deltacloud/drivers/ec2/ec2_driver.rb, line 140
  def realms(credentials, opts=nil)
    ec2 = new_client(credentials)
    realms = []
    safely do
      ec2.describe_availability_zones.availabilityZoneInfo.item.each do |ec2_realm|
        realms << convert_realm( ec2_realm )
      end
    end
    realms
  end