Rancher1.6.14
CentOS的7
vagrant up
vagrant ssh rancher
（选项）
# vagrant box add generic/centos7 --provider "virtualbox" --insecure
# vagrant plugin uninstall vagrant-vbguest
Docker 17.12.0-CE
sudo yum update -y
sudo yum install -y yum-utils yum-plugin-versionlock
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install -y docker-ce-17.12.0.ce-1.e
