how to fix Got permission denied while trying to connect to the Docker daemon socket code example

Example 1: Got permission denied while trying to connect to the Docker daemon socket

sudo chmod 666 /var/run/docker.sock

Example 2: `Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.24/images/create?fromImage=mysql&tag=latest: dial unix /var/run/docker.sock: connect: permission denied

$ docker run hello-world