k8s 集群之间clusterIp+port互不相同问题、flannel节点之间无法通信解决办法

问题原因1，pod-network-cidr 与默认(10.244.0.0/16)配置不同

修改官方部署flannel的yaml文件中

{
      "Network": "10.244.0.0/16", # 改成你部署集群是的 --pod-network-cidr
      "Backend": {
        "Type": "vxlan"
      }
}

问题原因2，用虚拟机安装，mac地址重复导致

检查问题

$ kubectl get node -o yaml | grep -A3 Vtep
      flannel.alpha.coreos.com/backend-data: '{"VtepMAC":"fe:22:77:eb:2f:a4"}'
      flannel.alpha.coreos.com/backend-type: vxlan
      flannel.alpha.coreos.com/kube-subnet-manager: "true"
      flannel.alpha.coreos.com/public-ip: 172.18.27.252
--
      flannel.alpha.coreos.com/backend-data: '{"VtepMAC":"fe:22:77:eb:2f:a4"}'
      flannel.alpha.coreos.com/backend-type: vxlan
      flannel.alpha.coreos.com/kube-subnet-manager: "true"
      flannel.alpha.coreos.com/public-ip: 172.18.27.253
--
      flannel.alpha.coreos.com/backend-data: '{"VtepMAC":"fe:22:77:eb:2f:a4"}'
      flannel.alpha.coreos.com/backend-type: vxlan
      flannel.alpha.coreos.com/kube-subnet-manager: "true"
      flannel.alpha.coreos.com/public-ip: 172.18.27.254

分别在所有节点创建10-flannel.1.link文件

cat<<'EOF'>/etc/systemd/network/10-flannel.1.link
[Match]
OriginalName=flannel.1

[Link]
MACAddressPolicy=none
EOF

删除 flannel.1

ip link delete flannel.1

删除集群中所有kube-flannel-dspod，之后pod自动重建时，flannel.1会被重建

kubectl delete pod kube-flannel-ds-*** -n kube-system

kube-flannel-ds-*** 换成你集群中的具体名称

测试是否可以互通