ocker pull apache/causeway-app-helloworld:latest
permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post “http://%2Fvar%2Frun%2Fdocker.sock/v1.24/images/create?fromImage=apache%2Fcauseway-app-helloworld&tag=latest”: dial unix /var/run/docker.sock: connect: permission denied
登录的用户没权限，加上sudo
sudo docker pull apache/causeway-app-helloworld:latest
