手册说明
Chef 是一个系统集成框架，为整个架构提供配置管理功能，有了 Chef 你可以：
Manage your servers by writing code, not by running commands. (via Cookbooks)
Integrate tightly with your applications, databases, LDAP directories, and more. (via Libraries)
Easily configure applications that require knowledge about your entire infrastructure ("What systems are running my application?" "What is the current master database server?")
