add group to docker code example

Example 1: add user to docker group

sudo usermod -aG docker $USER   #$USER is your username

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