O knife status
não funciona?
$ knife status
24 minutes ago, server-063.vm.example.com, server-063.vm.example.com, 192.168.1.188, ubuntu 10.04.
4 minutes ago, server-061.vm.example.com, server-061.vm.example.com, 192.168.1.184, ubuntu 10.04.
3 minutes ago, server-062.vm.example.com, server-062.vm.example.com, 192.168.1.39, ubuntu 10.04.