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异构服务中心通讯

ServiceCenter和Eureka异构服务中心通讯

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：
image

运行环境

  1. 2台linux机器: （假设为：10.0.0.10 和 10.0.0.11）
  2. JDK 1.8
  3. Maven 3.x
  4. Go 1.11.4

运行前的准备：

  1. 安装 ServiceCenter发布包（>=1.3.0） 
    $ project_dir=`pwd`
$ tar -zxvf  apache-servicecomb-service-center-1.3.0-linux-amd64.tar.gz
  2. 下载样例源码 
    git clone https://github.com/apache/servicecomb-service-center.git
cd ${project_dir}/servicecomb-service-center/syncer

步骤1：启动Eureka环境和服务

机器： 10.0.0.10

1. 编译项目

# 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
    image

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
    image

4. 启动Syncer

$ cd ${project_dir}/apache-servicecomb-service-center-1.3.0-linux-amd64/
$ ./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  --node 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

$ cd ${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/servicecenter/hello-server/
$ GO111MODULE=on go build

2. 启动Servicecenter

  • 修改启动配置：
    文件位置：${project_dir}/apache-servicecomb-service-center-1.3.0-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-1.3.0-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
    image

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
    image
    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}/apache-servicecomb-service-center-1.3.0-linux-amd64/
$ ./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 --node servicecenter

#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 = servicecenter, groupName = 0204d59328090c2f4449a088d4e0f1d8
2019-09-19T18:44:35.536+0800	DEBUG	serf/agent.go:130	member = eureka, groupName = 34f53a9520a11c01f02f58f733e856b3
2019-09-19T18:44:35.536+0800	DEBUG	server/handler.go:97	Going to pull data from eureka 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

  1. 此时的HelloServer获取实例成功，并调用了AccountServer的CheckHealth接口
    image

  2. 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
    image
    image
  3. 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
    image
    HelloServer
    image