It is a LXC implementation, application-level coontainer to build, ship, and run distributed applications
Docker是PaaS供应商dotCloud开源的一个基于LXC 的高级容器引擎，源代码托管在 GitHub 上, 基于Go语言开发并遵从Apache 2.0协议开源。
Docker提供了一种在安全、可重复的环境中自动部署软件的方式，它的出现拉开了基于云计算平台发布产品方式的变革序幕。
It is a configuration management tool that helps system administrators automate the provisioning, configuration, and management of a server infrastructure.
It is a systems and cloud infrastructure automation framework that makes it easy to deploy servers and applications to any physical, virtual, or cloud location, no matter the size of the infrastructure. Each organization is comprised of one (or more) workstations, a single server, and every node that will be configured and maintained by the chef-client.
Cookbooks (and recipes) are used to tell the chef-client how each node in your organization should be configured. The chef-client (which is installed on every node) does the actual configuration.