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

# 控制組

控制組是 Linux 容器機制的另外一個關鍵元件，負責實作資源的統計和限制。

它提供了很多有用的特性；以及確保各個容器可以公平地分享主機的記憶體、CPU、磁碟 IO 等資源；當然，更重要的是，控制組確保了當容器內的資源使用產生負載時不會連累主機系統。

盡管控制組不負責隔離容器之間相互存取、處理資料和程式，它在防止分散式阻斷服務（DDOS）攻擊方面是必不可少的。尤其是在多使用者的平台（比如公有或私有的 PaaS）上，控制組十分重要。例如，當某些應用程式表現異常的時候，可以保證一致地正常執行和效能。

控制組機制始於 2006 年，核心從 2.6.24 版本開始被引入。


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