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Flannel 网络理解

 2 years ago
source link: http://www.chenshake.com/the-flannel-network-understands-that-the/
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昨晚参加了一个k8s的网络培训，老师讲的内容不深，不过也确实解答了我以前对这个的疑问。这里我就总结一下我对这个的理解。

Flannel的网络，至少5个backend。

  • UDP：需要进入内核转两次，性能差，基本不会生产使用
  • vxlan：性能不错，和ipip原理基本相似
  • ipip： 性能不错，
  • host-gw：性能最好，有局限性，必须在一个二层上.
  • directrouting (host-gw+vxlan)：两个结合，高性能和跨网段都可以。不过应该带来复杂性。

其实肯定就要回答，他们间有啥区别。Flannel网络的资料，基本都是在github上，不多。

官方github

#For Kubernetes v1.17+ 
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

这是你装完K8s后，部署flannel的网络，你需要根据你选择的网络，来修改kube-flannel.yaml 就可以，或者部署后，你可以修改configmap来修改。

  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "Backend": {
        "Type": "vxlan" #host-gw,udp,ipip
      }
    }
---
     "Backend": {
        "Type": "vxlan",
        "Directrouting": true #加一行这个
  • https://www.cnblogs.com/sandshell/p/11769642.html

 Posted by 陈沙克 at 5:04 PM

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