官网上安装docker的步骤

1、

sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine



2、

sudo yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2


3、

sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo


4、

sudo yum install docker-ce docker-ce-cli containerd.io


5、

sudo systemctl start docker


6、

sudo docker run hello-world


7、

sudo systemctl start docker


8、

sudo docker run hello-world