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本文使用K8s当做服务注册与发现、配置管理，使用gRpc用做服务间的远程通讯

一、先准备K8s

我在本地有个K8s单机

二、准备service-provider

1. pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.5.14</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>service-provider</artifactId><version>0.0.1-SNAPSHOT</version><name>service-provider</name><description>service-provider</description><properties><java.version>11</java.version><!--        <os.detected.classifier>osx-aarch_64</os.detected.classifier>--><os.detected.classifier>osx-x86_64</os.detected.classifier></properties><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><type>pom</type><scope>import</scope><version>2.5.14</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>2020.0.6</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-kubernetes-dependencies</artifactId><version>1.1.10.RELEASE</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-kubernetes-client-all</artifactId></dependency><!-- gRpc --><dependency><groupId>net.devh</groupId><artifactId>grpc-spring-boot-starter</artifactId><version>2.13.1.RELEASE</version></dependency><dependency><groupId>io.grpc</groupId><artifactId>grpc-protobuf</artifactId><version>1.52.1</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional><version>1.18.24</version></dependency></dependencies><build><extensions><extension><groupId>kr.motd.maven</groupId><artifactId>os-maven-plugin</artifactId><version>1.7.1</version></extension></extensions><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><classifier>exec</classifier></configuration></plugin><plugin><groupId>org.xolstice.maven.plugins</groupId><artifactId>protobuf-maven-plugin</artifactId><version>0.6.1</version><configuration><protocArtifact>com.google.protobuf:protoc:3.21.7:exe:${os.detected.classifier}</protocArtifact><pluginId>grpc-java</pluginId><pluginArtifact>io.grpc:protoc-gen-grpc-java:1.52.1:exe:${os.detected.classifier}</pluginArtifact></configuration><executions><execution><goals><goal>compile</goal><goal>compile-custom</goal></goals></execution></executions></plugin></plugins></build></project>

2. 配置文件 application.yml

grpc:server:port: 9090
server:port: 30000
spring:application:name: service-providercloud:kubernetes:reload:enabled: truemode: pollingperiod: 5000logging:level:org.springframework.cloud.loadbalancer: debug

3. 主类 ServiceProviderApplication

package com.example.service.provider;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication
@EnableDiscoveryClient
public class ServiceProviderApplication {public static void main(String[] args) {SpringApplication.run(ServiceProviderApplication.class, args);}
}

4. 在 src/main/proto文件夹下新增PB文件 HelloFacade.proto

syntax = "proto3";option java_multiple_files = true;
option java_package = "com.example.service.provider.api";
option java_outer_classname = "HelloServiceProto";service HelloService {rpc SayHello (SayHelloRequest) returns (SayHelloResponse) {}
}message SayHelloRequest {string name = 1;
}message SayHelloResponse {int32 code = 1;string message = 2;bool success = 3;SayHelloData data = 4;
}message SayHelloData {string name = 1;string content = 2;
}

5. 接口实现类

package com.example.service.provider.facade;import com.example.service.provider.api.HelloServiceGrpc;
import com.example.service.provider.api.SayHelloData;
import com.example.service.provider.api.SayHelloRequest;
import com.example.service.provider.api.SayHelloResponse;
import lombok.extern.slf4j.Slf4j;
import net.devh.boot.grpc.server.service.GrpcService;@Slf4j
@GrpcService
public class HelloServiceImpl extends HelloServiceGrpc.HelloServiceImplBase {@Overridepublic void sayHello(SayHelloRequest request, io.grpc.stub.StreamObserver<SayHelloResponse> responseObserver) {log.info("接收consumer的say hello grpc 请求");SayHelloData helloData = SayHelloData.newBuilder().setName("maple").setContent("say hello").build();SayHelloResponse.Builder builder = SayHelloResponse.newBuilder().setCode(0).setMessage("success").setSuccess(true).setData(helloData);responseObserver.onNext(builder.build());responseObserver.onCompleted();}
}

6. Dockerfile

FROM openjdk:11-jdk-slim
ENV jarName="service-provider.jar"
ADD service-provider-0.0.1-SNAPSHOT-exec.jar $jarName
ENTRYPOINT java -Duser.timezone=GMT+8 -jar  $jarName

7. K8s声明yaml文件 service-provider-deploy.yaml

apiVersion: v1
kind: Namespace
metadata:name: service-k8s-demolabels:name: service-k8s-demo---apiVersion: v1
kind: ServiceAccount
metadata:name: service-k8s-demonamespace: service-k8s-demo---kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:namespace: service-k8s-demoname: service-k8s-demo
rules:- apiGroups:- ""resources:- services- configmaps- endpoints- nodes- pods- secrets- namespacesverbs:- get- list- watch---apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:name: service-k8s-demonamespace: service-k8s-demo
subjects:
- kind: ServiceAccountname: service-k8s-demonamespace: service-k8s-demo
roleRef:kind: ClusterRolename: service-k8s-demoapiGroup: rbac.authorization.k8s.io---apiVersion: apps/v1
kind: Deployment
metadata:name: service-providernamespace: service-k8s-demolabels:app: service-provider
spec:replicas: 3template:metadata:name: service-providerlabels:app: service-providerspec:containers:- name: service-providerimage: service-provider:1.0ports:- name: httpprotocol: TCPcontainerPort: 30000- name: grpcprotocol: TCPcontainerPort: 9090imagePullPolicy: IfNotPresentserviceAccountName: service-k8s-demorestartPolicy: Alwaysselector:matchLabels:app: service-provider---apiVersion: v1
kind: Service
metadata:name: service-providernamespace: service-k8s-demo
spec:selector:app: service-providerports:- port: 80targetPort: 30000name: http- port: 9090targetPort: 9090name: grpcclusterIP: None

8. 本地启动测试

三、准备service-consumer

1. pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.5.14</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>service-consumer</artifactId><version>0.0.1-SNAPSHOT</version><name>service-consumer</name><description>service-consumer</description><properties><java.version>11</java.version></properties><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><type>pom</type><scope>import</scope><version>2.5.14</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>2020.0.6</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-kubernetes-dependencies</artifactId><version>1.1.10.RELEASE</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>com.example</groupId><artifactId>service-provider</artifactId><version>0.0.1-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-kubernetes-client-all</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional><version>1.18.24</version></dependency><!-- gRpc --><dependency><groupId>net.devh</groupId><artifactId>grpc-spring-boot-starter</artifactId><version>2.13.1.RELEASE</version></dependency><dependency><groupId>io.grpc</groupId><artifactId>grpc-protobuf</artifactId><version>1.52.1</version></dependency></dependencies><build><extensions><extension><groupId>kr.motd.maven</groupId><artifactId>os-maven-plugin</artifactId><version>1.7.1</version></extension></extensions><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><classifier>exec</classifier></configuration></plugin><plugin><groupId>org.xolstice.maven.plugins</groupId><artifactId>protobuf-maven-plugin</artifactId><version>0.6.1</version><configuration><protocArtifact>com.google.protobuf:protoc:3.21.7:exe:${os.detected.classifier}</protocArtifact><pluginId>grpc-java</pluginId><pluginArtifact>io.grpc:protoc-gen-grpc-java:1.52.1:exe:${os.detected.classifier}</pluginArtifact></configuration><executions><execution><goals><goal>compile</goal><goal>compile-custom</goal></goals></execution></executions></plugin></plugins></build>
</project>

2. 配置文件 application.yml

grpc:server:port: 9091client:service-provider:negotiation-type: plaintextenable-keep-alive: truekeep-alive-without-calls: trueaddress: 'static://service-provider:9090'server:port: 30001
spring:application:name: service-consumercloud:kubernetes:reload:enabled: truemode: pollingperiod: 5000logging:level:org.springframework.cloud.loadbalancer: debug

3. 主类 ServiceConsumerApplication

package com.example.service.consumer;import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@Slf4j
@RestController
@EnableDiscoveryClient
@SpringBootApplication
@RequiredArgsConstructor
public class ServiceConsumerApplication {private final DiscoveryClient discoveryClient;private final ProviderServiceGrpcClient providerServiceGrpcClient;public static void main(String[] args) {SpringApplication.run(ServiceConsumerApplication.class, args);}@GetMapping("/grpc/hello")public String sayHello() {log.info("消费服务:service-consumer grpc 调用 service-provider");return providerServiceGrpcClient.sayHello();}@GetMapping("/consumers/services")public List<String> findServices() {log.info("当前注册中心下所有服务");List<String> services = discoveryClient.getServices();services.stream().map(discoveryClient::getInstances).forEach(v ->v.forEach(s -> System.out.printf("%s:%s  uri:%s%n", s.getHost(), s.getPort(), s.getUri())));return services;}
}

4. gRpc调用Provider ProviderServiceGrpcClient

package com.example.service.consumer;import com.example.service.provider.api.HelloServiceGrpc;
import com.example.service.provider.api.SayHelloRequest;
import com.example.service.provider.api.SayHelloResponse;
import net.devh.boot.grpc.client.inject.GrpcClient;
import org.springframework.stereotype.Service;@Service
public class ProviderServiceGrpcClient {@GrpcClient("service-provider")private HelloServiceGrpc.HelloServiceBlockingStub helloServiceBlockingStub;public String sayHello() {SayHelloRequest request = SayHelloRequest.newBuilder().setName("maple123").build();SayHelloResponse sayHelloResponse = helloServiceBlockingStub.sayHello(request);return sayHelloResponse.toString();}
}

5. Dockerfile

FROM openjdk:11-jdk-slim
ENV jarName="service-consumer.jar"
ADD service-consumer-0.0.1-SNAPSHOT-exec.jar $jarName
ENTRYPOINT java -Duser.timezone=GMT+8 -jar  $jarName

6. K8s声明yaml文件 service-consumer-deploy.yaml

apiVersion: v1
kind: Namespace
metadata:name: service-k8s-demolabels:name: service-k8s-demo---apiVersion: v1
kind: ServiceAccount
metadata:name: service-k8s-demonamespace: service-k8s-demo---kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:namespace: service-k8s-demoname: service-k8s-demo
rules:- apiGroups:- ""resources:- services- configmaps- endpoints- nodes- pods- secrets- namespacesverbs:- get- list- watch---apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:name: service-k8s-demonamespace: service-k8s-demo
subjects:- kind: ServiceAccountname: service-k8s-demonamespace: service-k8s-demo
roleRef:kind: ClusterRolename: service-k8s-demoapiGroup: rbac.authorization.k8s.io---apiVersion: apps/v1
kind: Deployment
metadata:name: service-consumernamespace: service-k8s-demolabels:app: service-consumer
spec:replicas: 1template:metadata:name: service-consumerlabels:app: service-consumerspec:containers:- name: service-consumerimage: service-consumer:1.0ports:- name: httpprotocol: TCPcontainerPort: 30001- name: grpcprotocol: TCPcontainerPort: 9091imagePullPolicy: IfNotPresentserviceAccountName: service-k8s-demorestartPolicy: Alwaysselector:matchLabels:app: service-consumer---apiVersion: v1
kind: Service
metadata:name: service-consumernamespace: service-k8s-demo
spec:selector:app: service-consumerports:- port: 80targetPort: 30001name: http- port: 9091targetPort: 9091name: grpctype: NodePort

7. 本地启动测试

四、打镜像

docker build -t service-provider:1.0 .
docker build -t service-consumer:1.0 .

五、执行K8s yaml文件 创建命名空间、账号、角色、部署应用、暴露端口等

kubetl apply -f service-provider-deploy.yaml
kubetl apply -f service-consumer-deploy.yaml

六、查看与测试

gRpc正常访问，但是发现一个问题，下面的图片，上面三个是Provider，发现负载均衡失效了，请求全都打在了一个Provider里，搜了下发现和 gRpc基于HTTP2.0 多路复用 有关，之后再处理吧。