service docker start 报错 ：Failed to start docker.se
service docker start 报错 ：Failed to start docker.service: Unit not found.解决办法：
vi /usr/lib/systemd/system/docker.socket
添加内容如下：
Description=Docker Socket for the API
PartOf=docker.service
ListenStream=/var/run/docker.sock
SocketMode=0660
SocketUser=root
SocketGroup=docker
WantedBy=sockets.target
Then run:
保存退出，执行如下动作：
systemctl daemon-reload
systemctl start docker
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