1. #!/bin/bash
    2. yum install -y yum-utils device-mapper-persistent-data lvm2
    3. yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    4. yum install -y docker-ce-19.03.15-3.el7.x86_64
    5. systemctl start docker && systemctl enable docker
    6. systemctl  is-active docker