Install Docker on CentOS 7

1. Install the necessary system tools

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

2. Add Docker software source

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

3. Install Docker CE

yum install docker-ce

4. Start the Docker service

systemctl start docker

5. Test whether Docker is installed correctly

docker run hello-world