08.存儲Cinder→5.場景學習→02.Create Volume→3.cinder-volume的處理過程

時間 2019-12-01

標籤存儲 cinder 場景學習 02.create create 3.cinder 處理過程简体版

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查看日誌，與 cinder-api 和 cinder-scheduler 執行方式相似，cinder-volume 也啓動了一個 Flow 來完成 volume 建立工做，Flow 的名稱爲 volume_create_manager。

Jun 11 16:51:15 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Flow 'volume_create_manager' (47f4261d-b806-421b-ba0b-3a8d632c5483) 
transitioned into state 'RUNNING' from state 'PENDING' 
{{(pid=30229) _flow_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:145

volume_create_manager 首先執行 ExtractVolumeRefTask, OnFailureRescheduleTask, ExtractVolumeSpecTask, NotifyVolumeActionTask 來爲 volume 建立作準備。它們的源碼位置位於

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/opt/stack/cinder/cinder
/volume/flows/manager
/create_volume.py

Jun 11 16:51:15 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.ExtractVolumeRefTask;volume:create' 
(3490974d-592b-43dd-a1c2-b27dc16810a6) transitioned into state 'RUNNING' from state 'PENDING' 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None]
 Task 'cinder.volume.flows.manager.create_volume.ExtractVolumeRefTask;volume:create' 
(3490974d-592b-43dd-a1c2-b27dc16810a6) transitioned into state 'SUCCESS' from state 'RUNNING'  
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

Extracts volume reference for given volume id

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.OnFailureRescheduleTask;volume:create' 
(449b4b47-d536-4216-8881-21e1b4e7ef8b) transitioned into state 'RUNNING' from state 'PENDING' 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.OnFailureRescheduleTask;volume:create' 
(449b4b47-d536-4216-8881-21e1b4e7ef8b) transitioned into state 'SUCCESS' from state 'RUNNING' ...
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

Triggers a rescheduling request to be sent when reverting occurs. 在恢復發生時，觸發從新scheduling請求

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.ExtractVolumeSpecTask;volume:create' 
(d66351f6-0906-4800-83af-c37087a8ef20) transitioned into state 'RUNNING' from state 'PENDING' 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.ExtractVolumeSpecTask;volume:create' 
(d66351f6-0906-4800-83af-c37087a8ef20) transitioned into state 'SUCCESS' from state 'RUNNING' ... 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

Extracts a spec of a volume to be created into a common structure

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.NotifyVolumeActionTask;volume:create, create.start' 
(c8c7b578-72c1-4bcb-9723-ec31b53c9097) transitioned into state 'RUNNING' from state 'PENDING' 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.NotifyVolumeActionTask;volume:create, create.start' 
(c8c7b578-72c1-4bcb-9723-ec31b53c9097) transitioned into state 'SUCCESS' from state 'RUNNING' ...
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

Performs a notification about the given volume when called

接下來 CreateVolumeFromSpecTask 執行 volume 建立任務Creates a volume from a provided specification

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.CreateVolumeFromSpecTask;volume:create' 
(3fa20d37-5784-42a6-888f-6d801ef59072) transitioned into state 'RUNNING' from state 'PENDING' 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

Jun 11 16:51:16 controller cinder-volume[29999]: 
INFO cinder.volume.flows.manager.create_volume [None req-a6c9fadb-0364-...] 
Volume 1ab8967e-45fb-4ff4-941f-2f1293bdc031: being created as raw with specification: 
{'status': u'creating', 'volume_size': 1, 'volume_name': u'volume-1ab8967e-45fb-4ff4-941f-2f1293bdc031'}

Jun 11 16:51:16 controller cinder-volume[29999]: 
DEBUG oslo_concurrency.processutils [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Running cmd (subprocess): sudo cinder-rootwrap /etc/cinder/rootwrap.conf env LC_ALL=C lvcreate -T -V 1g -n volume-1ab8967e-45fb-4ff4-941f-2f1293bdc031 
stack-volumes-lvmdriver-1/stack-volumes-lvmdriver-1-pool 
{{(pid=30229) execute /usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py:372

Jun 11 16:51:29 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.CreateVolumeFromSpecTask;volume:create' 
(3fa20d37-5784-42a6-888f-6d801ef59072) transitioned into state 'SUCCESS' from state 'RUNNING' ... 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

由於 volume provider 爲 LVM， CreateVolumeFromSpecTask 經過 lvcreate 命令在 VG stack-volumes-lvmdriver-1 中建立了一個 1G 的 LV，cinder-volume 將這個 LV 做爲volume。新建立的 LV 命名爲「volume-1ab8967e-45fb-4ff4-941f-2f1293bdc031」，其格式爲「volume-<volume ID>」。

root@controller:~# cinder list
+--------------------------------------+-----------+-------+------+-------------+----------+-------------+
| ID                                   | Status    | Name  | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-------+------+-------------+----------+-------------+
| 1ab8967e-45fb-4ff4-941f-2f1293bdc031 | available | vol-1 | 1    | lvmdriver-1 | false    |             |
+--------------------------------------+-----------+-------+------+-------------+----------+-------------+
root@controller:~# lvdisplay
  --- Logical volume ---
  LV Name                stack-volumes-lvmdriver-1-pool
  VG Name                stack-volumes-lvmdriver-1
  LV UUID                ww01ba-CepW-YeCG-RHfk-g0w4-oZfk-NQlmq9
  LV Write Access        read/write
  LV Creation host, time controller, 2019-06-08 12:16:27 +0800
  LV Pool metadata       stack-volumes-lvmdriver-1-pool_tmeta
  LV Pool data           stack-volumes-lvmdriver-1-pool_tdata
  LV Status              available
  # open                 2
  LV Size                22.80 GiB
  Allocated pool data    0.00%
  Allocated metadata     10.51%
  Current LE             5837
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:2
   
  --- Logical volume ---
  LV Path                /dev/stack-volumes-lvmdriver-1/volume-1ab8967e-45fb-4ff4-941f-2f1293bdc031
  LV Name                volume-1ab8967e-45fb-4ff4-941f-2f1293bdc031
  VG Name                stack-volumes-lvmdriver-1
  LV UUID                YeeBPY-aEWW-lTwO-zMua-l7b8-edVu-Q1Sdrz
  LV Write Access        read/write
  LV Creation host, time controller, 2019-06-11 16:51:25 +0800
  LV Pool name           stack-volumes-lvmdriver-1-pool
  LV Status              available
  # open                 0
  LV Size                1.00 GiB
  Mapped size            0.00%
  Current LE             256
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:4

第一個Logical volume是安裝完devstack就帶的

最後，CreateVolumeOnFinishTask 完成掃尾工做On successful volume creation this will perform final volume actions

Jun 11 16:51:29 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.CreateVolumeOnFinishTask;volume:create, create.end' 
(7b0b8d49-a629-4cde-a58b-f2d465399eec) transitioned into state 'RUNNING' from state 'PENDING' 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

Jun 11 16:51:29 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Task 'cinder.volume.flows.manager.create_volume.CreateVolumeOnFinishTask;volume:create, create.end' 
(7b0b8d49-a629-4cde-a58b-f2d465399eec) transitioned into state 'SUCCESS' from state 'RUNNING' 
{{(pid=30229) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

至此，volume 成功建立，Flow volume_create_manager 結束。

Jun 11 16:51:29 controller cinder-volume[29999]: 
DEBUG cinder.volume.manager [None req-a6c9fadb-0364-43da-bbf0-d333c549aa74 admin None] 
Flow 'volume_create_manager' (47f4261d-b806-421b-ba0b-3a8d632c5483) 
transitioned into state 'SUCCESS' from state 'RUNNING' 
{{(pid=30229) _flow_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:145