去看k8s配套的istio的版本
https://istio.io/latest/docs/releases/supported-releases/#support-status-of-istio-releases
1. 下载安装包
https://github.com/istio/istio/releases/download
2. 解压
tar xvf istio-1.17.2-linux-amd64.tar.gz
mv istio-1.17.2/bin/istioctl /usr/local/bin
验证：istioctl version
3. 安装istio
istioctl install --set profile=demo -y
卸载
istioctl uninstall --purge
kubectl delete ns istio-system
