permission denied while trying to connect to the Docker daemon socket 错误

安装 docker 执行错误如下：

$ docker ps

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/containers/json”: dial unix /var/run/docker.sock: connect: permission denied

解决方法：
docker.sock 文件的权限问题,可以重置其权限:

sudo chmod 666 /var/run/docker.sock

之后就正常了

lighthouse@VM-ubuntu:~$ docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES