docker-component初次使用坑

$ docker info
Client:
 Debug Mode: false

Server:
ERROR: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/info: dial unix /var/run/docker.sock: connect: permission denied
errors pretty printing info

明显是没有权限，一个是用sudo来执行，一个是把用户加入docker组然后重启docker

因为在docker守护进程启动的时候，会默认给docker的用户组权限。

$ docker-compose ps
ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running?

If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.

刚开始没有头绪，在issue https://github.com/docker/compose/issues/4181 中找答案，前面的都试过了，直到看到

......

So I tried to use Docker to build each file individually:

docker build -f="Dockerfile-drupal" .

This gave me a more useful error:

Error checking context: 'no permission to read from some/data/directory'

......

啊，还是权限问题，只是docker那边懒得设置group一直用sudo

$ sudo usermod -aG docker ${USER}