Failed to listen on Docker Socket for the API. Docker安装过程遇到的问题

Failed to listen on Docker Socket for the API. Docker安装过程遇到的问题
最近开始学习一下docker，没想到在安装的时候就卡住了。。

根据网上的步骤安装完docker
通过systemctl strat docker来启动docker
发现无法启动docker
执行journalctl-xe 弹出了以下报错信息

-- Unit docker.socket has begun starting up.
10月 26 20:20:35 VM_0_13_centos systemd[16041]: Failed to chown socket at step GROUP: No such process
10月 26 20:20:35 VM_0_13_centos systemd[1]: docker.socket control process exited, code=exited status=21
10月 26 20:20:35 VM_0_13_centos systemd[1]: Failed to listen on Docker Socket for the API.
-- Subject: Unit docker.socket has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.socket has failed.
-- 
-- The result is failed.
10月 26 20:20:35 VM_0_13_centos systemd[1]: Dependency failed for Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.service has failed.
-- 
-- The result is dependency.
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`主要的报错原因呢是
Failed to chown socket at step GROUP: No such process
所以添加docker用户组即可解决这个问题
执行

groupadd docker
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再次尝试启动docker即可

systemctl enable docker  && systemctl start docker
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