Ubuntu, CentOS Resolve Docker command permissions issues (sudo)

#Create docker group
[email protected]: ~ $ sudo groupadd docker
groupadd: group ‘docker‘ already exists
#Add the current user to the docker group
[email protected]: ~ $ sudo gpasswd -a $ {USER} docker
Adding user weiyj to group docker
#Restart docker service
[email protected]: ~ $ sudo service docker restart
#Refresh docker group members
[email protected]: ~ $ newgrp-docker
#Try the command again ^ _ ^
[email protected]: ~ $ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
[email protected]: ~ $ 

Ubuntu, CentOS Resolve Docker command permissions issues (sudo)