Got permission denied while trying to connect to the Docker daemon socket at unix

拉取Dockerimages時錯誤信息如下：

[master@localhost ~]$ docker pull redis
Using default tag: latest
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.39/images/create?fromImage=redis&tag=latest: dial unix /var/run/docker.sock: connect: permission denied

看樣子是權限出問題了，查看當前用戶的屬組是否具有docker組

[master@localhost ~]$ groups 
master wheel

將當前用戶添加到docker屬組中：

usermod -a -G docker 當前用戶名

然后退出重新登陸，查看組：

[master@localhost ~]$ groups 
master wheel docker

這樣就哦了。