编排Spring Cloud微服务

一 编排的微服务列表

二 使用Maven插件构建Docker镜像，在各个项目的pom,xml中添加以下内容

  <!-- 添加spring-boot的maven插件 -->
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>

      <!-- 添加docker-maven插件 -->
      <plugin>
        <groupId>com.spotify</groupId>
        <artifactId>docker-maven-plugin</artifactId>
        <version>0.4.13</version>
        <configuration>
          <imageName>itmuch/${project.artifactId}:${project.version}</imageName>
          <baseImage>java</baseImage>
          <entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint>
          <resources>
            <resource>
              <targetPath>/</targetPath>
              <directory>${project.build.directory}</directory>
              <include>${project.build.finalName}.jar</include>
            </resource>
          </resources>
        </configuration>
      </plugin>
    </plugins>
  </build>

由配置可知，构建出来的镜像名称是itmuch/各个微服务的aitifactId:各个微服务的版本，例如：itmuch/microservice-provider-user:0.0.1-SNAPSHOT

三 修改各微服务的配置文件application.yml

由于Docker默认的网络模式是bridge，各个容器的IP都不相同，因此使用http://localhost:8761/eureka满足不了需求。可在Eureka所在的容器配置一个主机名discovery，并让各个微服务使用主机名访问Eureka Server。

各微服务配置修改如下：

eureka:
  client:
    serviceUrl:
      defaultZone: http://discovery:8761/eureka/

四 将各个微服务代码拷贝到Linux

[[e-mail] springcloud]# ll
total 16
-rw-r--r-- 1 root root  682 Jul  8 12:57 docker-compose-easy.yml
-rw-r--r-- 1 root root 1352 Jul  8 12:57 docker-compose.yml
drwxr-xr-x 4 root root   43 Jul  8 12:59 microservice-consumer-movie-ribbon-hystrix
drwxr-xr-x 4 root root 4096 Jul  8 13:00 microservice-discovery-eureka
drwxr-xr-x 4 root root   43 Jul  8 13:01 microservice-gateway-zuul
drwxr-xr-x 4 root root   43 Jul  8 13:01 microservice-hystrix-dashboard
drwxr-xr-x 4 root root   43 Jul  8 13:02 microservice-hystrix-turbine
drwxr-xr-x 4 root root   60 Jul  8 13:02 microservice-provider-user
-rw-r--r-- 1 root root 1520 Jul  8 12:57 pom.xml

五 在每个项目的根目录执行以下命令，构建各个微服务的镜像

mvn clean package docker:build
[[e-mail] springcloud]# docker images
REPOSITORY                                          TAG                 IMAGE ID            CREATED             SIZE
itmuch/microservice-provider-user                   0.0.1-SNAPSHOT      7da7fcfb4ded        31 minutes ago      693MB
itmuch/microservice-hystrix-turbine                 0.0.1-SNAPSHOT      cc22655d299f        32 minutes ago      683MB
itmuch/microservice-hystrix-dashboard               0.0.1-SNAPSHOT      870de69167aa        32 minutes ago      671MB
itmuch/microservice-gateway-zuul                    0.0.1-SNAPSHOT      c2a78b5998b9        33 minutes ago      682MB
itmuch/microservice-discovery-eureka                0.0.1-SNAPSHOT      deff6ac69b16        33 minutes ago      685MB
itmuch/microservice-consumer-movie-ribbon-hystrix   0.0.1-SNAPSHOT      656eccee221c        34 minutes ago      682MB

六 编写docker-compose.yml

[[e-mail] springcloud]# cat docker-compose.yml
version: '2'        # 表示该docker-compose.yml文件使用的是Version 2 file format
services:           # Version 2 file format的固定写法，为project定义服务。
  microservice-discovery-eureka:                                  # 指定服务名称
    image: itmuch/microservice-discovery-eureka:0.0.1-SNAPSHOT    # 指定服务所使用的镜像
    ports:                                                        # 暴露端口信息
      - "8761:8761"
  microservice-provider-user:
    image: itmuch/microservice-provider-user:0.0.1-SNAPSHOT
    links:          # 链接到microservice-discovery-eureka，这边使用的是SERVICE:ALIAS的形式
      - microservice-discovery-eureka:discovery
  microservice-consumer-movie-ribbon-hystrix:
    image: itmuch/microservice-consumer-movie-ribbon-hystrix:0.0.1-SNAPSHOT
    links:
      - microservice-discovery-eureka:discovery
  microservice-gateway-zuul:
    image: itmuch/microservice-gateway-zuul:0.0.1-SNAPSHOT
    links:
      - microservice-discovery-eureka:discovery
  microservice-hystrix-dashboard:
    image: itmuch/microservice-hystrix-dashboard:0.0.1-SNAPSHOT
    links:
      - microservice-discovery-eureka:discovery
  microservice-hystrix-turbine:
    image: itmuch/microservice-hystrix-turbine:0.0.1-SNAPSHOT
    links:
      - microservice-discovery-eureka:discovery

七 执行以下命令启动项目

docker-compose up -d

八 测试

输入http://192.168.0.100:8761/