低版本vagrant在下载远程box时报错

问题：The box 'generic/centos7' could not be found or could not be accessed in the remote catalog

Bringing machine 'default' up with 'virtualbox' provider...
==> default: Box 'generic/centos7' could not be found. Attempting to find and install...
    default: Box Provider: virtualbox
    default: Box Version: >= 0
The box 'generic/centos7' could not be found or
could not be accessed in the remote catalog. If this is a private
box on HashiCorp's Atlas, please verify you're logged in via
`vagrant login`. Also, please double-check the name. The expanded
URL and error message are shown below:

URL: ["https://atlas.hashicorp.com/generic/centos7"]
Error: The requested URL returned error: 404 Not Found

错误

问题原因：vagrant版本过低（我的是1.7.2），官方已经更换了地址，升级vagrant到2.x或者在Vgrantfile中配置下载地址

1）升级可重新安装
2）修改配置：在Vagrantfile中添加Vagrant::DEFAULT_SERVER_URL.replace('https://vagrantcloud.com')即可

修改配置

然后执行vagrant up，OK！

success

国内可用box源：
http://mirrors.ustc.edu.cn/centos-cloud/centos/6/vagrant/x86_64/images/