2023年8月17日，本人之前使用过nacos+dubbo+springboot、eureka+feign等环境。最近学习到了istio服务网格集成到k8s也可以实现分布式微服务。

1. 环境

• Kubernetes集群
• istio集成到k8s
• jdk17 (8也ok)
• gPRC服务间通信

2. 微服务

• cloud-config服务是spring-cloud-config-server配置中心，用于加载远程配置文件，该服务端口号8081
• boot-rpc-service服务是生产者微服务，开放的gRPC端口18082
• boot-grpc-client服务是消费者微服务，开放的http端口是8083，开放接口
  
/test1?name=hello

  实现了grpc调用生产者微服务
• 公共服务boot-grpc-api是生成的grpc proto信息

3. 部署到k8s

本地测试成功后，部署k8s

1. 生成各个服务jar包，上传服务器

   • cloud-config.jar
   • boot-rpc-service.jar
   • boot-grpc-client.jar

2. 构建各个服务docker镜像

   • istio-demo-spring-configserver:v3
   • istio-demo-spring-gprc-server:v3
   • istio-demo-spring-gprc-client:v3

3. 创建各个微服务deployment资源

   - image: 'istio-demo-spring-configserver:v3'
     ports:
       - containerPort: 8081
   

   - image: 'istio-demo-spring-gprc-server:v3'
     ports:
       - containerPort: 18082
   

   - image: 'istio-demo-spring-gprc-client:v3'
     ports:
       - containerPort: 8083
   

4. 创建service资源

   kind: Service
   metadata:
     name: web-base
   spec:
     ports:
       - name: config8081
         port: 8081
         targetPort: 8081
       - name: gserver18082
         port: 18082
         targetPort: 18082
       - name: gclient8083
         port: 8083
         targetPort: 8083
   

5. 到此还没使用istio的功能，先验证一下服务是否正常启动
   
   
curl -I "http://web-base:8083/test1?name=hello"

   
   结果;
   
   HTTP/1.1 200 OK
   
   content-type: text/plain;charset=UTF-8
   
   content-length: 14
   
   date: Thu, 17 Aug 2023 02:40:23 GMT
   
   x-envoy-upstream-service-time: 32
   
   server: envoy

6. 创建istio虚拟服务用于内部grpc通信

   apiVersion: networking.istio.io/v1alpha3
   kind: VirtualService
   metadata:
     name: web-base-internal-vs
   spec:
     hosts:
       - web-base
     http:
         route:
           - destination:
               host: web-base
               subset: dd11
             headers:
               response:
                 set:
                   ssxppp: ffffffyyyyyyy-internall
   ---
   apiVersion: networking.istio.io/v1alpha3
   kind: DestinationRule
   metadata:
     name: web-base-dr
   spec:
     host: web-base
     subsets:
       - name: dd11
         labels:
           version: vv11
   

7. 使用istio的功能，先验证一下内部服务是否添加了响应header信息
   
   
curl -I "http://web-base:8083/test1?name=hello"

   
   结果;
   
   HTTP/1.1 200 OK
   
   content-type: text/plain;charset=UTF-8
   
   content-length: 14
   
   date: Thu, 17 Aug 2023 02:40:23 GMT
   
   x-envoy-upstream-service-time: 32
   
   server: envoy
   
   
   ssxppp: ffffffyyyyyyy-internall
   

8. 创建istio网关和虚拟服务用于外部交互

   apiVersion: networking.istio.io/v1alpha3
   kind: VirtualService
   metadata:
     name: web-base-external-vs
   spec:
     hosts:
       - grpcdemo.xxx.cn
     gateways:
       - grpcdemo-gateway
     http:
         route:
           - destination:
               host: web-base
               subset: dd11
               port:
                 number: 8083
             headers:
               response:
                 set:
                   ssxppp: ffffffyyyyyyy-externall
   ---
   apiVersion: networking.istio.io/v1alpha3
   kind: Gateway
   metadata:
     name: grpcdemo-gateway
   spec:
     selector:
       istio: ingressgateway # use Istio default gateway implementation
     servers:
       - port:
           number: 80
           name: http
           protocol: HTTP
         hosts:
           - "grpcdemo.xxx.cn"
   

9. 验证外部访问是否成功
   
   
curl -I -HHost:grpcdemo.xxx.cn "http://192.168.0.101:32318/test1?name=hello"

   
   （端口号是ingressgateway服务的nodeport）
   
   
   结果;
   
   HTTP/1.1 200 OK
   
   content-type: text/plain;charset=UTF-8
   
   content-length: 14
   
   date: Thu, 17 Aug 2023 02:40:23 GMT
   
   x-envoy-upstream-service-time: 32
   
   server: envoy
   
   
   ssxppp: ffffffyyyyyyy-extenall
   

源码

https://github.com/shenshuxin01/grpc-springboot/tree/dev-istio