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                在宿主機上在創造一層overlay network.docker0與pod是在同一子網段,每臺node flannel0是在同一子網段,pod的的互通flannel主要采用kernel路由表與udp封裝去達到這個,一個pod的數據包首先進入到docker0,在每臺node上面有一個flanneld進程,他會在內核創建相應的路由表,flannnel0本質上是一個flanneld進程創建的一個tun設備,tun是一個內核實現的軟件接口,用來在內核與用戶程序中傳遞數據包,tun主要的工做流程是,將數據包發送到內核,內核查詢路由表進行路由,找到flannel0,kernel會發送數據包到flanneld進程上,flanneld進程默認的監聽端口是8285,所以會設定udp包的目標端口是8285, docker0之所以能夠采用這個網段是因為flanneld為docker0寫進了子網配置信息,會總共在userspace與kernel中傳遞3次,(flannel工作在二層上。)
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