Open Stack

I guess others may ask the same questions.

I read the nova API doc:
such as this API:
http://developer.openstack.org/api-ref-compute-v2.1.html#showServer

GET /v2.1/​{tenant_id}​/servers/​{server_id}​
*Show server details*


*Request parameters*
ParameterStyleTypeDescription
tenant_id URI csapi:UUID

The UUID of the tenant in a multi-tenancy cloud.
server_id URI csapi:UUID

The UUID of the server.

But I can get the server by DB index:

curl -s -H X-Auth-Token:6b8968eb38df47c6a09ac9aee81ea0c6
http://192.168.2.103:8774/v2.1/f5a8829cc14c4825a2728b273aa91aa1/servers/2
{
    "server": {
        "OS-DCF:diskConfig": "MANUAL",
        "OS-EXT-AZ:availability_zone": "nova",
        "OS-EXT-SRV-ATTR:host": "shaohe1",
        "OS-EXT-SRV-ATTR:hypervisor_hostname": "shaohe1",
        "OS-EXT-SRV-ATTR:instance_name": "instance-00000002",
        "OS-EXT-STS:power_state": 1,
        "OS-EXT-STS:task_state": "migrating",
        "OS-EXT-STS:vm_state": "error",
        "OS-SRV-USG:launched_at": "2015-12-18T07:41:00.000000",
        "OS-SRV-USG:terminated_at": null,
        ......
    }
}

and the code really allow it use  DB index
https://github.com/openstack/nova/blob/master/nova/compute/api.py#L1939
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