docker stop `docker ps |awk {'print $1'}|grep -v CONTAINER`

docker rm -f $(docker ps -qa)

docker volume rm $(docker volume ls -q)

docker rmi -f `docker images|awk {'print $3'}`

systemctl stop docker
systemctl disable docker

dnf remove docker docker-ce

• /etc/docker/
• /etc/default/docker/
• /var/lib/docker/