异构服务中心
本案例模拟了异构服务中心之间的通讯场景，包括以下四个部分：
- EurekaServer： Eureka服务中心
- AccountServer：注册到Eureka的账号服务
- Servicecomb-ServiceCenter：Servicecomb-ServiceCenter服务中心
- HelloServer：注册到Servicecomb-ServiceCenter，需要使用AccountServer的服务
在传统的环境中，不同服务中心之间的实例是不能互相发现并访问的。当我们使用Syncer后，这将很容易实现。如下图：
运行环境
- 2台linux机器: （假设为：10.0.0.10 和 10.0.0.11）
- JDK 1.8
- Maven 3.x
- Go 1.11.4
- ServiceComb Service-Center 1.2.0
步骤1：启动Eureka环境和服务
机器： 10.0.0.10
1. 编译项目
# 记录当前目录 $ project_dir=`pwd` # 下载源码 $ git clone https://github.com/apache/servicecomb-service-center.git # 编译 Syncer $ cd servicecomb-service-center/syncer $ GO111MODULE=on go build # 编译 EurekaServer 和 AccountServer $ cd samples/multi-servicecenters/eureka $ mvn clean install
2. 启动EurekaServer：
- 修改启动配置 文件位置：${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/eureka-server/src/main/resources/application.yaml
spring: application: name: eureka-server server: port : 8761 # servlet: # context-path: /eureka eureka: instance: hostname : 10.0.0.10 client: registerWithEureka : false fetchRegistry : false serviceUrl: defaultZone : http://${eureka.instance.hostname}:${server.port}/eureka/ management: endpoints: web: exposure: include: "*"
- 启动服务
# 启动 EurekaServer $ cd ${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/eureka-server/ $ nohup mvn spring-boot:run & >> eureka-server.log 2>&1 &
浏览器打开http://10.0.0.10:8761，若出现如下页面，则启动成功
3. 启动AccountServer
- 修改启动配置
文件位置：${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/account-server/src/main/resources/application.yaml
spring: application: name: account-server server: port: 8090 eureka: instance: hostname: 10.0.0.10 client: service-url: defaultZone: http://${eureka.instance.hostname}:8761/eureka/ management: endpoints: web: exposure: include: "*"
- 启动服务
#启动 AccountServer $ cd ${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/account-server $ mvn spring-boot:run # 出现如下字样则为成功 2019-09-19 17:20:35.534 INFO 20890 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8090 (http) with context path '' 2019-09-19 17:20:35.548 INFO 20890 --- [ main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8090 2019-09-19 17:20:35.551 INFO 20890 --- [ main] o.a.s.s.account.AccountApplication : Started AccountApplication in 3.92 seconds (JVM running for 6.754) 2019-09-19 17:20:35.617 INFO 20890 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_ACCOUNT-SERVER/10.0.0.10:account-server:8090 - registration status: 204
此时打开http://10.0.0.10:8761，可以看到AccountServer已经注册成功
4. 启动Syncer
$ cd ${project_dir}/servicecomb-service-center/syncer $ ./syncer daemon --sc-addr http://10.0.0.10:8761/eureka --bind-addr 10.0.0.10:30190 --rpc-addr 10.0.0.10:30191 --sc-plugin=eureka # 出现如下字样则为成功 2019-09-19T17:28:28.809+0800 INFO etcd/agent.go:55 start etcd success 2019-09-19T17:28:28.809+0800 INFO grpc/server.go:94 start grpc success 2019-09-19T17:28:28.809+0800 DEBUG server/handler.go:39 is leader: true 2019-09-19T17:28:28.809+0800 DEBUG server/handler.go:43 Handle Tick
步骤2：启动Servicecenter环境和服务
机器： 10.0.0.11
1. 编译项目
# 记录当前目录 $ project_dir=`pwd` # 下载源码 $ git clone https://github.com/apache/servicecomb-service-center.git # 编译 Syncer $ cd servicecomb-service-center/syncer $ GO111MODULE=on go build # 编译 HelloServer $ cd samples/multi-servicecenters/servicecenter/hello-server/ $ GO111MODULE=on go build
2. 启动Servicecenter
- 下载ServiceCenter项目
$ cd ${project_dir} # 下载 ServiceCenter 1.2.0版本包 $ curl -O https://mirrors.tuna.tsinghua.edu.cn/apache/servicecomb/servicecomb-service-center/1.2.0/apache-servicecomb-service-center-1.2.0-linux-amd64.tar.gz $ tar -zxvf apache-servicecomb-service-center-1.2.0-linux-amd64.tar.gz
- 修改启动配置：
文件位置：${project_dir}/apache-servicecomb-service-center-1.2.0-linux-amd64/conf/app.conf
frontend_host_ip = 10.0.0.11 frontend_host_port = 30103 ################################################################### # sever options ################################################################### # if you want to listen at ipv6 address, then set the httpaddr value like: # httpaddr = 2400:A480:AAAA:200::159 (global scope) # httpaddr = fe80::f816:3eff:fe17:c38b%eth0 (link-local scope) httpaddr = 10.0.0.11 httpport = 30100 # ...以下省略...
- 启动 ServiceCenter 和 Frontend
$ cd ${project_dir}/apache-servicecomb-service-center-1.2.0-linux-amd64 # 启动 ServiceCenter $ ./start-service-center.sh # 启动 前端页面 Frontend $ ./start-frontend.sh
浏览器打开http://10.0.0.11:30103,若出现如下页面，则启动成功
3. 启动HelloServer
- 修改启动配置：
文件位置：${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/servicecenter/hello-server/conf/microservice.yaml
service: # 微服务配置 appId: eureka # eureka 中同步的实例appID均为：eureka name: hello-server version: 0.0.1 instance: # 实例信息 protocol: rest listenAddress: 10.0.0.11:8091 #实例监听地址 provider: # 服务端信息 appId: eureka name: account-server version: 0.0.1 registry: address: http://10.0.0.11:30100
- 启动服务
$ cd ${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/servicecenter/hello-server $ ./hello-server 2019-09-19T18:37:50.645+0800 DEBUG servicecenter/servicecenter.go:163 send heartbeat success 2019-09-19T18:37:50.645+0800 WARN servicecenter/servicecenter.go:85 discovery provider failed, appID = eureka, name = account-server, version = 0.0.1 2019-09-19T18:37:50.645+0800 INFO servicecenter/servicecenter.go:87 waiting for retry
此时打开http://10.0.0.11:30103，可以看到HelloServer已经注册成功
但由于无法发现属于Eureka服务中心的AccountServer实例，HelloServer处于重试状态
（==注：重试次数为3次，每次间隔30秒，所以我们需要在90秒内完成后面的操作==）
4.启动Syncer
$ cd ${project_dir}/servicecomb-service-center/syncer $ ./syncer daemon --sc-addr http://10.0.0.11:30100 --bind-addr 10.0.0.11:30190 --rpc-addr 10.0.0.11:30191 --sc-plugin=servicecenter --join-addr 10.0.0.10:30190 # 出现以下内容则为Syncer成功启动，并同步了对方的实例 2019-09-19T18:44:35.536+0800 DEBUG server/handler.go:62 is leader: true 2019-09-19T18:44:35.536+0800 DEBUG server/handler.go:79 Receive serf user event 2019-09-19T18:44:35.536+0800 DEBUG serf/agent.go:130 member = xxxxxa, groupName = 0204d59328090c2f4449a088d4e0f1d8 2019-09-19T18:44:35.536+0800 DEBUG serf/agent.go:130 member = xxxxxb, groupName = 34f53a9520a11c01f02f58f733e856b3 2019-09-19T18:44:35.536+0800 DEBUG server/handler.go:97 Going to pull data from xxxxxb 10.0.0.10:30191 2019-09-19T18:44:35.536+0800 INFO grpc/client.go:76 Create new grpc connection to 10.0.0.10:30191 2019-09-19T18:44:35.538+0800 DEBUG servicecenter/servicecenter.go:87 create service success orgServiceID= account-server, curServiceID = 80784229255ec96d90353e3c041bdf3586fdbbae 2019-09-19T18:44:35.538+0800 DEBUG servicecenter/servicecenter.go:90 trying to do registration of instance, instanceID = 10.0.0.10:account-server:8090 2019-09-19T18:44:35.540+0800 DEBUG servicecenter/sync.go:63 Registered instance successful, instanceID = 78bca3e2daca11e99638fa163eca30e0
步骤3：结果验证
此时的HelloServer获取实例成功，并调用了AccountServer的CheckHealth接口
分别打开Euraka和ServiceCenter的网页，两个服务中心里均包含了所有的实例信息
curl命令调用HelloServer的Login接口
$ curl -X POST \ http://192.168.88.75:8091/login \ -H 'Content-Type: application/json' \ -d '{ "user":"Jack", "password":"123456" }' welcome Jack
HelloServer与AccountServer分别会打印如下的信息
AccountServer
HelloServer