def app_servers
      ret = @servers.select { |s| s.nickname =~ /App Server/ }
      raise "No app servers in deployment" unless ret.length > 0
      ret
    end
def app_servers
      ret = @servers.select { |s| s.nickname =~ /App Server/ }
      raise "No app servers in deployment" unless ret.length > 0
      ret
    end
def app_servers ret = @servers . select { | s | s . nickname =~ / / } raise "No app servers in deployment" unless ret . length > 0 ret end
returns an Array of the App Servers in the deployment
returns an Array of the App Servers in the deployment