sudo apt-get remove docker docker-engine docker.io containerd runc

    sudo apt-get update

    sudo apt-get install apt-transport-https
    sudo apt-get install ca-certificates
    sudo apt-get install curl
    sudo apt-get install gnupg-agent
    sudo apt-get install software-properties-common

    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

    sudo apt-key fingerprint 0EBFCD88

    sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

    sudo apt-get update

    sudo apt-get install docker-ce docker-ce-cli containerd.io

    sudo docker run hello-world

    sudo docker version

    sudo systemctl start | stop | restart docker.service

    sudo systemctl enable docker

    sudo systemctl list-unit-files | grep docker

    sudo apt-get update

    sudo apt-get purge docker-ce docker-ce-cli containerd.io docker docker.io
    sudo rm -rf /var/lib/docker
    sudo apt autoremove

    sudo groupadd docker

    sudo usermod -aG docker $USER

    docker search nginx

    docker pull nginx

    docker images

    docker rmi -f nginx

    docker ps

    docker ps -a

    docker top nginx

    docker port xx

    docker inspect xx

    docker logs nginx

    docker rm -f xx