[
  {
    "id": "virtual_server_uuid_91",
    "state": "scheduling",
    "image_id": "vertual_server_image_uuid_01",
    "hostname": "physical_server_uuid_01",
    "instance_spec_id": "virtual_server_spec_uuid_01",
    "vif": [],
    "status": "init",
    "memory_size": 256,
    "ha_enabled": 0,
    "network": [],
    "arch": "x86_64",
    "host_node": "physical_server_uuid_01",
    "created_at": "2011-10-18T06:48:47Z",
    "netfilter_group_id": ["ng-demofgr"],
    "ssh_key_pair": null,
    "volume": [],
    "netfilter_group": ["default"],
    "cpu_cores": 1
  }
]