在分析nova的众多log文件时，如nova-api，nova-scheduler，nova-compute等，其中的request id是串联起整个flow的关键词。
而通过nova instance-action-list <server>指令即可获得相关操作的request id的信息：
root@controller:~# nova instance-action-list Vm-Test-01
+--------+------------------------------------------+---------+----------------------------+
| Action | Request_ID | Message | Start_Time |
+--------+------------------------------------------+---------+----------------------------+
| create | req-1070b9b3-9626-4329-ae54-cc5837aee9b2 | - | 2018-07-10T07:28:38.000000 |
| stop | req-f99c85e9-f344-41ea-b0d8-4d1830e3a5d0 | - | 2018-07-19T01:54:55.000000 |
+--------+------------------------------------------+---------+----------------------------+
而且通过下面这个CLI指令，能获得相关操作的概要信息：
usage: nova instance-action <server> <request_id>
root@ controller:~# nova instance-action Vm-Test-01 req-1070b9b3-9626-4329-ae54-cc5837aee9b2
+---------------+----------------------------------------------------+
| Property | Value |
+---------------+----------------------------------------------------+
| action | create |
| events | [{u'event': u'compute__do_build_and_run_instance', |
| | u'finish_time': u'2018-07-10T07:28:45.000000', |
| | u'result': u'Success', |
| | u'start_time': u'2018-07-10T07:28:39.000000', |
| | u'traceback': None}] |
| instance_uuid | 01c06694-2d1f-4168-a92f-8762cf41a542 |
| message | - |
| project_id | 42cdcb9c73c9439ea95910cdc890dd58 |
| request_id | req-1070b9b3-9626-4329-ae54-cc5837aee9b2 |
| start_time | 2018-07-10T07:28:38.000000 |
| user_id | fee776518e74453e983d624d4ab30fdd |
+---------------+----------------------------------------------------+