安装docker

1.Set up the repository

sudo yum install -y yum-utils

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

2.Install Docker Engine

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

3.Start Docker.

sudo systemctl start docker

4.测试

docker run hello-world