1.检查内核版本，返回的值大于3.10即可。
$ uname -r
2.确保yum是最新的
$ yum update
3.添加 yum 仓库
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg
https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
4.安装 Docker
$ yum install -y docker-engine
5.启动
docker $systemctl start docker.service
6.查看
docker --version
7.设置开机启动
$ sudo systemctl enable docker
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