K8s中的命令执行由apiserver、kubelet、cri、docker等组件共同完成, 其中最复杂的就是协议切换以及各种流拷贝相关,让我们一起来看下关键实现,虽然代码比较多，但是不会开发应该也能看懂，祝你好运 1. 基础概念 K8s中的命令执行中有很多协议相关的处理, 我们先一起看下这些协议处理相关的基础概念 1.1 Http协议中的Connection与Upgrade HTTP/1.1中允许在同一个链接上通过Header头中的Connection配合Upgrade来实现协议的转换，简单来说就是允许在通过HTTP建立的链接之上使用其他的协议来进行通信，这也是k8s中命令中实现协议升级的关键 1.2 Http协议中的101状态码 在HTTP协议中除了我们常见的HTTP1.1,还支持websocket/spdy等协议,那服务端和客户端如何在http之上完成不同协议的切换呢，首先第一个要素就是这里的101(Switching Protocal)状态码, 即服务端告知客户端我们切换到Uprage定义的协议上来进行通信(复用当前链接) 1.3 SPDY协议中的stream SPDY协议是google开发的TCP会话层协议, SPDY协议中将Http的Request/Response称为Stream，并支持TCP的链接复用，同时多个stream之间通过Stream-id来进行标记，简单来说就是支持在单个链接同时进行多个请求响应的处理，并且互不影响，k8s中的命令执行主要也就是通过stream来进行消息传递的
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