警告：未能从守护程序获取默认registry端点
在Ubuntu 16.04 LTS中，每当尝试使用docker login命令时，将显示以下交战信息：
docker login Warning: failed to get default registry endpoint from daemon (Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.30/info: dial unix /var/run/docker.sock: connect: permission denied). Using system default: https://index.docker.io/v1/ Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one. Username: csomethingr Password: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.30/auth: dial unix /var/run/docker.sock: connect: permission denied 任何解决scheme
使用sudo docker login
或者像@Serey提到的那样，将你的用户添加到docker组中
usermod -aG docker $USER