08.存儲Cinder→5.場景學習→04.Detach Volume

時間 2019-12-01

標籤存儲 cinder 場景學習 04.detach detach 简体版

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背景：html

注意，這個文件中的volume都是已經被attach了的，沒有attach的volume不會在這個文件夾(針對lvm是這樣，但nfs不是)

描述

詳細

向 cinder-api 發送 detach 請求

客戶（能夠是 OpenStack 最終用戶，也能夠是其餘程序）向 cinder-api 發送請求：「請 detach 指定 instance 上的 volume。」
這裏咱們將 detach instance 「c1」上的 volume 「vol-1」進入 GUI 操做菜單Project -> Volumes -> Volumes。選擇 volume 「vol-1」，點擊「Manage Attachments」。點擊「Detach Volume」。

查看cinder-api日誌

Jun 20 17:05:32 controller devstack@c-api.service[31309]: 

INFO cinder.api.openstack.wsgi 

[req-8db7c86d-8c94-42bc-a2cd-923051715351 req-7... admin admin] 

POST http://172.16.1.17/volume/v3/51743f081cb7477f9a1f4ccdf6490d8e

/volumes/f0a54ac7-5423-4794-8883-d753f6a903cd/action

Jun 20 17:05:32 controller devstack@c-api.service[31309]: 

DEBUG cinder.api.openstack.wsgi 

[req-8db7c86d-8c94-42bc-a2cd-923051715351 req-... admin admin] 

Action body: {"os-begin_detaching": null} 

{{(pid=31313) get_method /opt/stack/cinder/cinder/api/openstack/wsgi.py:985

cinder-api 發送消息

cinder-api 發送消息 detach 消息。cinder-api 沒有打印發送消息的日誌，只能經過源代碼查看 /opt/stack/cinder/cinder/volume/api.py，方法爲 detach。

nova-compute detach volume

查看計算節點上的n-cpu日誌

Jun 20 17:05:33 compute nova-compute[5685]: 

INFO nova.compute.manager 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

[instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] 

Detaching volume f0a54ac7-5423-4794-8883-d753f6a903cd

調用os-brick模塊來detach volume

Jun 20 17:05:33 compute nova-compute[5685]: 

DEBUG nova.virt.libvirt.volume.iscsi 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

[instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] calling os-brick to detach iSCSI Volume 

{{(pid=5685) disconnect_volume /opt/stack/nova/nova/virt/libvirt/volume/iscsi.py:72}

具體有下面幾個步驟：

將緩存中的數據 Flush 到 volume

Jun 20 17:05:33 compute nova-compute[5685]: 

DEBUG os_brick.initiator.linuxscsi 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

Flushing IO for device /dev/sda {{(pid=5685)

flush_device_io /usr/local/lib/python2.7/dist-packages/os_brick/initiator/linuxscsi.py:313

target vdb的souce是/dev/sda，就是要 attach 的 volume參考見08.存儲Cinder→5.場景學習→3.Attach Volume→2.實際操做

刪除計算節點上 volume 對應的 SCSI 設備sda

Jun 20 17:05:33 compute nova-compute[5685]: 

DEBUG os_brick.initiator.linuxscsi 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

Remove SCSI device /dev/sda with /sys/block/sda/device/delete 

{{(pid=5685) remove_scsi_device /usr/local/lib/python2.7/dist-packages/os_brick/initiator/linuxscsi.py:76

Jun 20 17:05:33 compute nova-compute[5685]: 

DEBUG os_brick.initiator.linuxscsi 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

Checking to see if SCSI volumes sda have been removed. 

{{(pid=5685) wait_for_volumes_removal /usr/local/lib/python2.7/dist-packages/os_brick/initiator/linuxscsi.py:84

Jun 20 17:05:33 compute nova-compute[5685]: 

DEBUG os_brick.initiator.linuxscsi 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

SCSI volumes sda have been removed. 

{{(pid=5685) wait_for_volumes_removal /usr/local/lib/python2.7/dist-packages/os_brick/initiator/linuxscsi.py:93

經過 iscsiadm 的 logout，delete 操做斷開與 iSCSI target 的鏈接

Jun 20 17:05:33 compute nova-compute[5685]: 

DEBUG os_brick.initiator.connectors.iscsi 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

iscsiadm ('--logout',): stdout=Logging out of session ...

Jun 20 17:05:33 compute nova-compute[5685]: 

DEBUG os_brick.initiator.connectors.iscsi 

[None req-8db7c86d-8c94-42bc-a2cd-923051715351 admin admin] 

iscsiadm ('--op', 'delete'): stdout= stderr= 

{{(pid=5685) _run_iscsiadm /usr/local/lib/python2.7/dist-packages/os_brick/initiator/connectors/iscsi.py:973

cinder-volume 刪除 target

存儲節點 cinder-volume 經過 tgt-admin 命令刪除 volume 對應的 target。查看c-vol日誌

Jun 20 17:05:34 controller cinder-volume[304]: 

INFO cinder.volume.targets.tgt 

[req-8db7c86d-8c94-42bc-a2cd-923051715351 req-47b18f6e-2c48-4977-ac20-803ff3125bd5 admin None] 

Removing iscsi_target for Volume ID: f0a54ac7-5423-4794-8883-d753f6a903cd

Jun 20 17:05:34 controller cinder-volume[304]: 

DEBUG oslo_concurrency.processutils 

[req-8db7c86d-8c94-42bc-a2cd-923051715351 req-47b18f6e-2c48-4977-ac20-803ff3125bd5 admin None] 

CMD "sudo cinder-rootwrap /etc/cinder/rootwrap.conf tgt-admin --force --delete 

iqn.2010-10.org.openstack:volume-f0a54ac7-5423-4794-8883-d753f6a903cd" returned: 0 in 0.273s 

{{(pid=460) execute /usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py:409