站長資訊網在一個使用的環境發現兩個ceph的rbd刪除不了，發現兩個rbd都是由于殘留了watch的信息。在此記錄處理過程。
處理方法
[root@node-2 ~]# rbd rm compute/2d05517a-8670-4cce-b39d-709e055381d6_disk
2018-06-11 13:19:14.787750 7fd05853bd80 -1 librbd: cannot obtain exclusive lock – not removing
Removing image: 0% complete…failed.
rbd: error: image still has watchers
This means the image is still open or the client using it crashed. Try again after closing/unmapping it or waiting 30s for the crashed client to timeout.
查看rbd 殘留的watch信息
[root@node-2 ~]# rbd status compute/2d05517a-8670-4cce-b39d-709e055381d6_disk
Watchers:
watcher=192.168.55.2:0/2900899764 client.14844 cookie=139644428642944
將該殘留的watch信息添加到osd的黑名單，再查看watch是否存在。
[root@node-2 ~]# ceph osd blacklist add 192.168.55.2:0/2900899764
blacklisting 192.168.55.2:0/2900899764 until 2018-06-11 14:25:31.027420 (3600 sec)
[root@node-2 ~]# rbd status compute/2d05517a-8670-4cce-b39d-709e055381d6_disk
Watchers: none
刪除rbd
[root@node-2 ~]# rbd rm compute/2d05517a-8670-4cce-b39d-709e055381d6_disk
Removing image: 100% complete…done.
