centos7 安装 最新版本的docker

1.更新yum: yum update

2.添加docker的yum源命令行输入:
tee /etc/yum.repos.d/docker.repo <<-'EOF'
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
EOF

3.安装docker包 yum install docker-engine

4.启动服务 service docker start

5.输入docker version