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在一个使用的环境发现两个 ceph 的 rbd 删除不了，发现两个 rbd 都是由于残留了 watch 的信息。在此记录处理过程。
处理方法
[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 残留的 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
将该残留的 watch 信息添加到 osd 的黑名单，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
删除 rbd
[root@node-2 ~]# rbd rm compute/2d05517a-8670-4cce-b39d-709e055381d6_disk
Removing image: 100% complete…done.
更多 SUSE 相关信息见 SUSE 专题页面 https://www.linuxidc.com/topicnews.aspx?tid=3
