Flannel CNI切换为Kube OVN CNI

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1. 删除 Flannel CNI的配置

新建脚本，将以下内容拷入，执行脚本，删除Flannel的配置信息。注意过滤条件 -lapp=galaxy 需要修改为适配自己情况的条件，或者直接查出来全部的Flannel Pod，分步骤执行命令。

#!/usr/bin/env bash
set -euo pipefail

echo "[Step -1] Delete flannel and galaxy resource on host"
for galaxy in $(kubectl get pod --no-headers -n kube-system -lapp=galaxy | awk '{print $1}')
do
  kubectl exec -n kube-system "$galaxy" -- ip link del flannel.1
  kubectl exec -n kube-system "$galaxy" -- rm -rf /host/etc/cni/net.d/00-galaxy.conf
  kubectl exec -n kube-system "$galaxy" -- rm -rf /etc/cni/net.d/00-galaxy.conf
done
echo "-------------------------------"
echo ""

echo "[Step 0] delete flannel and galaxy resource in kubernetes"
kubectl delete ds flannel galaxy-daemonset -n kube-system --ignore-not-found=true
kubectl delete cm cni-etc galaxy-etc kube-flannel-cfg -n kube-system --ignore-not-found=true
kubectl delete sa flannel galaxy --ignore-not-found=true
kubectl delete clusterrole flannel --ignore-not-found=true
kubectl delete clusterrolebindings flannel galaxy --ignore-not-found=true
kubectl annotate no --all flannel.alpha.coreos.com/backend-data-
kubectl annotate no --all flannel.alpha.coreos.com/backend-type-
kubectl annotate no --all flannel.alpha.coreos.com/kube-subnet-manager-
kubectl annotate no --all flannel.alpha.coreos.com/public-ip-
echo "-------------------------------"
echo ""

2. 执行Kube-OVN的安装脚本，安装Kube-OVN CNI插件