08.存储Cinder→5.场景学习→12.Ceph Volume Provider→3.Create Volume

描述

详细

1. 创建 ceph volume 操作方法与 LVM volume 一样，唯一区别是在 volume type 的下拉列表中选择“ceph”。
2. 点击“Create Volume”，cinder-api，cinder-scheduler 和 cinder-volume 共同协作创建 volume “vol-1”。这个流程与 LVM volume 一样。由于只有一个存储节点，因此筛选出的还是控制节点。
3. 下面我们重点分析 cinder-volume 日志，看看 Ceph volume provider 是如何创建 volume 的。

4. 查看日志cinder-volume日志：
1. cinder-volume 也会启动 Flow 来完成 volume 创建工作，Flow 的名称为 volume_create_manager。

1 2 3 4 5 6

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.manager [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Flow 'volume_create_manager' (bc289638-f0c9-4296-9ea3-b8fee5ae0496) transitioned into state 'RUNNING' from state 'PENDING' {{(pid=9947) _flow_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:145

2. volume_create_manager 首先执行 ExtractVolumeRefTask, OnFailureRescheduleTask, ExtractVolumeSpecTask, NotifyVolumeActionTask 为 volume创建做准备。然后由 CreateVolumeFromSpecTask 真正创建 volume。

1 2 3 4 5 6

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.manager [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Task 'cinder.volume.flows.manager.create_volume.CreateVolumeFromSpecTask;volume:create' (f7f21bc6-326e-4dd7-ba44-9a1c7bcc34e0) transitioned into state 'RUNNING' from state 'PENDING' {{(pid=9947) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

1 2 3 4 5

Jun 27 14:39:28 controller cinder-volume[9796]: INFO cinder.volume.flows.manager.create_volume [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Volume 6babe822-1674-4687-a037-b483a2c62929: being created as raw with specification: {'status': u'creating', 'volume_size': 1, 'volume_name': u'volume-6babe822-1674-4687-a037-b483a2c62929'}

3. 通过connecting to ceph创建volume，使用的是rbd driver

1 2 3 4 5

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.drivers.rbd [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] creating volume 'volume-6babe822-1674-4687-a037-b483a2c62929' {{(pid=9947) create_volume /opt/stack/cinder/cinder/volume/drivers/rbd.py:779

1 2 3 4 5

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.drivers.rbd [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] connecting to ceph (timeout=-1). {{(pid=9947) _do_conn /opt/stack/cinder/cinder/volume/drivers/rbd.py:332

4. create 操作完成

1 2 3 4 5 6 7 8

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.manager [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Task 'cinder.volume.flows.manager.create_volume.CreateVolumeFromSpecTask;volume:create' (f7f21bc6-326e-4dd7-ba44-9a1c7bcc34e0) transitioned into state 'SUCCESS' from state 'RUNNING' with result '{'status': u'creating', 'volume_size': 1, 'volume_name': u'volume-6babe822-1674-4687-a037-b483a2c62929'}' {{(pid=9947) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

1 2 3 4 5 6

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.manager [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Task 'cinder.volume.flows.manager.create_volume.CreateVolumeOnFinishTask;volume:create, create.end' (90ced764-c94d-4666-8b5b-8ec279e58fc1) transitioned into state 'RUNNING' from state 'PENDING' {{(pid=9947) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:194

1 2 3 4 5

Jun 27 14:39:28 controller cinder-volume[9796]: INFO cinder.volume.flows.manager.create_volume [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Volume volume-6babe822-1674-4687-a037-b483a2c62929 (6babe822-1674-4687-a037-b483a2c62929): created successfully

1 2 3 4 5 6 7

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.manager [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Task 'cinder.volume.flows.manager.create_volume.CreateVolumeOnFinishTask;volume:create, create.end' (90ced764-c94d-4666-8b5b-8ec279e58fc1) transitioned into state 'SUCCESS' from state 'RUNNING' with result 'None' {{(pid=9947) _task_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:183

1 2 3 4 5 6

Jun 27 14:39:28 controller cinder-volume[9796]: DEBUG cinder.volume.manager [None req-9387d0b4-8fc5-4d0a-93fa-e381c8a33dfd demo None] Flow 'volume_create_manager' (bc289638-f0c9-4296-9ea3-b8fee5ae0496) transitioned into state 'SUCCESS' from state 'RUNNING' {{(pid=9947) _flow_receiver /usr/local/lib/python2.7/dist-packages/taskflow/listeners/logging.py:145

5. Volume在ceph上以object存在。