K8S V1.35新版已经不支持ingress了，所以要用istio代替。本文记录安装设置过程，供大家参考学习。

安装istio

1. 下载
   从https://github.com/istio/istio/releases 下载并解压
2. 安装
   执行命令

./bin/istioctl install --set profile=default -y

Gateway api 安装

kubectl apply --server-side -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.4.1/standard-install.yaml

部署应用

---
# 1.业务service
apiVersion: v1
kind: Service
metadata:
 name: tmp-gateway-service
 namespace: irmp-prod
spec:
 ports:
   - port: 8080
     targetPort: 8080
 selector:
   app: tmp-gateway
 type: ClusterIP

# 2. Gateway - 让 Istio 自动创建 Service
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
 name: tmp-gateway-gw
 namespace: irmp-prod
spec:
 gatewayClassName: istio
 listeners:
   - name: default
     hostname: "*.irmp.com"
     port: 80
     protocol: HTTP
     allowedRoutes:
       namespaces:
         from: All
---
# 3. HTTPRoute
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
 name: gw-httproute
 namespace: irmp-prod
spec:
 parentRefs:
   - name: tmp-gateway-gw
 hostnames:
   - "gw.irmp.com"
 rules:
   - matches:
       - path:
           type: PathPrefix
           value: /
     backendRefs:
       - name: tmp-gateway-service
         port: 8080

Gateway部署之后，它会自动安装一个tmp-gateway-gw-istio的Service，可以查看这个service的VIP，通过VIP可以访问你的服务了：

 export GW_IP=$(kubectl get svc tmp-gateway-gw-istio -n irmp-prod -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
 echo ${GW_IP}
 curl -H "Host: gw.irmp.com" http://${GW_IP}/