when run the calling "docker run hello-world" occur the error as follow:
Post http:///var/run/docker.sock/v1.19/containers/create: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS?
run "docker -d -D" show the detail errors as follow
FATA[0000] Error starting daemon: open /var/run/docker.pid: permission denied
Soltuion:
This error is because you have not started the docker service. Once you start the service it creates /var/run/docker.sock and then the error is resolved.
sudo service docker start
Then you can see if the installation is proper or not by sudo docker info.
docker error:service didn‘t start
原文：http://my.oschina.net/endeavour/blog/490511