add grpc upstream (#347)

src/content/docs/latest/zh-cn/ops/how-tos/grpc-upstream.md

@@ -7,4 +7,110 @@ custom_edit_url: https://github.com/higress-group/higress-group.github.io/blob/m
 
 # 路由指向 gRPC 服务
 
-TBD
+## 前置准备
+
+1. Higress 安装在 K8s 内的 higress-system 命名空间下，监听的 HTTP 端口为 80。 为了测试方便，gateway 端口映射都本地 127.0.0.1:80;
+2. 目标是为 default 命名空间下的 部署 grpc-httpbin 服务，服务监听的端口为 9091；
+3. grpc-httpbin 服务具体内容请参考 [github httpbin](https://github.com/2456868764/httpbin);
+4. grpcurl 工具请参考 [github grpcurl](https://github.com/fullstorydev/grpcurl);
+
+## 准备后端 grpc-httpbin 服务
+
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: grpc-httpbin-v1
+  namespace: default
+spec:
+  selector:
+    app: grpc-httpbin-v1
+  ports:
+    - protocol: TCP
+      port: 9091
+      targetPort: 9091
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: grpc-httpbin-v1
+  namespace: default
+  labels:
+    app: grpc-httpbin-v1
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: grpc-httpbin-v1
+  template:
+    metadata:
+      labels:
+        app: grpc-httpbin-v1
+    spec:
+      containers:
+      - name: grpc-httpbin-v1
+        image: registry.cn-hangzhou.aliyuncs.com/2456868764/httpbin:v1.0.1
+        env:
+        - name: POD_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
+        - name: NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        resources:
+          requests:
+            cpu: 10m
+```
+
+## 配置路由
+
+```yaml
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  annotations:
+    nginx.ingress.kubernetes.io/backend-protocol: "GRPC"
+  name: ingress-grpc-httpbin
+  namespace: default
+spec:
+  ingressClassName: higress
+  rules:
+    - host: foo.com
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: grpc-httpbin-v1
+                port:
+                  number: 9091
+```
+
+`nginx.ingress.kubernetes.io/backend-protocol` Ingress Annotaion 配置指定后端服务使用的协议，默认为HTTP，支持HTTP、HTTP2、HTTPS、GRPC和GRPCS。
+
+## grpcurl 调用测试
+
+1. 列出后端服务列表
+
+```shell
+grpcurl -plaintext -authority foo.com  127.0.0.1:80  list
+
+grpc.reflection.v1.ServerReflection
+grpc.reflection.v1alpha.ServerReflection
+order.OrderManagement
+```
+2. 调用 sayHello 方法
+
+```shell
+grpcurl -plaintext -authority foo.com -d '{"name": "jun"}' 127.0.0.1:80  order.OrderManagement/sayHello
+
+"Hello jun"
+```
+
+
+
+
+