> For the complete documentation index, see [llms.txt](https://hezhiqiang.gitbook.io/docker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hezhiqiang.gitbook.io/docker/security/control_group.md).

# 控制组

控制组是 Linux 容器机制的另外一个关键组件，负责实现资源的审计和限制。

它提供了很多有用的特性；以及确保各个容器可以公平地分享主机的内存、CPU、磁盘 IO 等资源；当然，更重要的是，控制组确保了当容器内的资源使用产生压力时不会连累主机系统。

尽管控制组不负责隔离容器之间相互访问、处理数据和进程，它在防止拒绝服务（DDOS）攻击方面是必不可少的。尤其是在多用户的平台（比如公有或私有的 PaaS）上，控制组十分重要。例如，当某些应用程序表现异常的时候，可以保证一致地正常运行和性能。

控制组机制始于 2006 年，内核从 2.6.24 版本开始被引入。


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