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docker root dir change

change the default docker root dir following this steps( docker version: 18.0)

[I want to change its default /var/lib/docker to /data/docker]

0. $> stop docker service: service docker stop

1. $> vi /usr/lib/systemd/system/docker.service

2.  edit the ExecStart item:$>   ExecStart=/usr/bin/dockerd -D --data-root /data/docker  (-D is debug mode)

3. reload daemon: $> systemctl daemon-reload

4. start docker: $> service docker start

5. check it work or not:  $> docker info