How to create rings when installing swift on ubuntu 12.04?

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http://askubuntu.com – I am installing swift object-server on ubuntu 12.04 machine and getting some problems. I've got following error when installing swift: IOError: [Errno 2] No such file or directory: '/etc/swift/object.ring.gz' I am not getting how to create/decide ZONE, DEVICE and use it in following command: swift-ring-builder account.builder add z<ZONE>-<STORAGE_LOCAL_NET_IP>:6002/<DEVICE> 100 swift-ring-builder container.builder add z<ZONE>- <STORAGE_LOCAL_NET_IP_1>:6001/<DEVICE> 100 swift-ring-builder object.builder add z<ZONE>-<STORAGE_LOCAL_N (HowTos)