docker执行权限问题Got permission denied while trying to connect to the Docker daemon socket

安装docker之后，执行docker images等命令，提示权限问题，报错如下：

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.24/images/json: dial unix /var/run/docker.sock: connect: permission denied

最直接的方式是通过sudo来执行：

sudo docker images

但是每次都要加上sudo还是挺麻烦的，因此考虑将用户加到docker组中来解决这个问题。

1、添加docker group

sudo groupadd docker

如果docker组已经存在，可能会出现如下提示：

groupadd: group 'docker' already exists

2、将用户'username'加到docker group中

sudo usermod -aG docker username

-aG：-a在-G存在的情况下，增加次要用户组的支持，而不是修改当前用户组。

3、重启session

上述操作之后，需要重新开一个session，用户再次登录之后，就可以不用sudo来执行docker相关的命令了。

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docker执行权限问题Got permission denied while trying to connect to the Docker daemon socket

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