centos 7 add user to docker group code example
Example 1: docker post installation steps linux
# Creates docker group
sudo groupadd docker
# Add your user to the docker group
sudo usermod -aG docker $USER
# Log out and log back in so that your group membership is re-evaluated
# GNOME example
gnome-session-quit
Example 2: docker to sudoers
# my case solution
sudo setfacl -m user:$USER:rw /var/run/docker.sock
#other solution
sudo usermod -aG docker $USER
#an other solution
sudo groupadd docker
sudo gpasswd -a $USER docker
docker run hello-world