What should I do if docker cannot delete the container?

Problem description:

The docker directory cannot be deleted by executing the delete command:

# ll /var/lib/docker/containers | grep caf8ef20f3c1
# cd /var/lib/docker/containers 
# rm -rf caf8ef20f3c1c78f03a5844ee23abc1d7e44246f242292040f1ef288899d0cb8

The error is reported as follows:

rm: 无法删除"/var/lib/docker/containers/caf8ef20f3c1c78f03a5844ee23abc1d7e44246f242292040f1ef288899d0cb8/secrets": 设备或资源忙
    无法删除"/var/lib/docker/containers/caf8ef20f3c1c78f03a5844ee23abc1d7e44246f242292040f1ef288899d0cb8/shm": 设备或资源忙

From the above error report, we can see that the "secrets" and "shm" shared mounts cannot be deleted.

(Recommended tutorial: docker tutorial)

Solution:

First find the mounting location, then cancel the mounting, and then delete:

# cat /proc/mounts |grep "docker" |grep "caf8ef20f3c1"

Unmount

# umount /data/sys/var/docker/containers/caf8ef20f3c1c78f03a5844ee23abc1d7e44246f242292040f1ef288899d0cb8/secrets
# umount /data/sys/var/docker/containers/caf8ef20f3c1c78f03a5844ee23abc1d7e44246f242292040f1ef288899d0cb8/shm

View again:

# cat /proc/mounts |grep "docker" |grep "caf8ef20f3c1"  //已经没有啦

Now execute the deletion of the docker directory:

# cd /var/lib/docker/containers 
# rm -rf caf8ef20f3c1c78f03a5844ee23abc1d7e44246f242292040f1ef288899d0cb8

Delete container service

Now we use rm or kill to delete the container service:

# docker rm -f caf8ef20f3c1c
或
# docker kill --signal=SIGINT  caf8ef20f3c1

If hang occurs after running the above command, please restart the docker service:

# systemctl restart docker

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