手把手教你如何编排和容器化微服务

准备

在本人的微服务系列中,已经演示了各个spring cloud 微服务组件的使用,以及相关的示例微服务应用。在每次启动微服务和对微服务进行扩容、缩容都不方便,本文使用docker-compose将以下的微服务容器化,并进行自动化部署。

1.微服务治理组件列表

2.微服务示例列表

3.环境与工具

  • 环境 linux (ubuntu 16)
  • 工具 docker+gitlab+rabbitmq+docker registry+intellij idea+maven

操作步骤

本文编写两个docker-compose.yml文件,将服务治理和服务示例分开,主要是因为服务示例依赖了服务治理,部分示例必须要等待服务治理组件加载完毕才能正常启动,比如hello项目使用了配置中心config server的配置,config server未加载完毕,hello项目启动异常。

虽然depends_on、links等具有启动顺序的问题,但解决不了启动是否 ready的问题.

1.编写 Dockerfile

在每个项目的根目录中,编写Dockerfile,文件内容为

FROM java:8-jre-alpine
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/' /etc/apk/repositories
VOLUME /tmp
ADD target/*.jar app.jar
RUN sh -c 'touch /app.jar'
RUN echo $(date) > /image_built_at
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar","--spring.profiles.active=${SPRING_PROFILES_ACTIVE}"]

其中SPRING_PROFILES_ACTIVE为后面docker-compose.yml传入的环境变量,指定项目以使用哪段配置启动。

2.在原有的配置文件application.yml增加spring.profiles:docker的配置

主要是使用docker后,服务依赖的其他服务的连接发生改变,通过配置环境变量来动态接收docker-compose的配置参数。

track增加的spring.profiles:docker配置

---
spring:
  profiles: docker
server:
  port: ${{SERVER_PORT}:9411}
eureka:
  client:
    serviceUrl:
      defaultZone: ${EUREKA_SERVER_LIST}

hello 增加的spring.profiles:docker配置

---
spring:
  profiles: docker
  datasource:
    url: jdbc:mysql://mysql:3306/${{MYSQL_DATABASE}:hello}
    username: ${{MYSQL_USERNAME}:user}
    password: ${{MYSQL_PASSWORD}:passworld}
    testWhileIdle: true
    validationQuery: SELECT 1
  jpa:
    show-sql: false
    hibernate:
      ddl-auto: update
      naming-strategy: org.hibernate.cfg.ImprovedNamingStrategy
      properties:
        hibernate:
          dialect: org.hibernate.dialect.MySQL5Dialect
  zipkin:
    base-url: http://track:9411

eureka:
  client:
    serviceUrl:
      defaultZone: ${EUREKA_SERVER_LIST}

${{MYSQL_USERNAME}:user} 是指配置文件在启动的时候如果没有读取到环境变量MYSQL_USERNAME的值,则使用默认值user。这种配置在开发的时候十分有用,比如切换开发、测试、生产环境配置。

3.编写批量编译的shell脚本images-build.sh

该脚本将进入到各个项目中,使用maven对项目进行打包,然后使用docker,根据Dockerfile对项目进行构建,生成分别带有:lastest 和当前日期标签的两个镜像。

#!/bin/bash

# 编译所有的代码,生成docker 镜像
function progress(){
    local GREEN CLEAN
    GREEN='\033[0;32m'
    CLEAN='\033[0m'
    printf "\n${GREEN}$@  ${CLEAN}\n" >&2
}

set -e

# 镜像仓库前缀
REGPREFIX=127.0.0.1:5000/billjiang
TOTAL=10

#discovery server
progress "Building discovery-server(1/${TOTAL}) jar file ..."
cd common/discovery
mvn clean package -DskipTests
progress "Building discovery(eureka server)(1/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/discovery -q .) ${REGPREFIX}/discovery:$(date -u "+%Y%m%d-%H%M%S")
cd -

#config server
progress "Building config-server(2/${TOTAL}) jar file ..."
cd common/configserver
mvn clean package -DskipTests
progress "Building config server(2/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/configserver -q .) ${REGPREFIX}/configserver:$(date -u "+%Y%m%d-%H%M%S")
cd -

#gateway
progress "Building gateway-zuul(3/${TOTAL}) jar file ..."
cd common/gateway
mvn clean package -DskipTests
progress "Building gateway-zuul(3/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/gateway -q .) ${REGPREFIX}/gateway:$(date -u "+%Y%m%d-%H%M%S")
cd -

#track sleuth+zipkin
progress "Building track(sleuth+zipkin)(4/${TOTAL}) jar file ..."
cd common/track
mvn clean package -DskipTests
progress "Building track by sleuth+zipkin(4/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/track -q .) ${REGPREFIX}/track:$(date -u "+%Y%m%d-%H%M%S")
cd -

#hystrix-dashboard
progress "Building hystrix-dashboard(5/${TOTAL}) jar file ..."
cd common/hystrix-dashboard
mvn clean package -DskipTests
progress "Building hystrix-dashboard(5/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/hystrix-dashboard -q .) ${REGPREFIX}/hystrix-dashboard:$(date -u "+%Y%m%d-%H%M%S")
cd -

#hystrix-turbine-mq
progress "Buildinhg hystrix-turbine-mq(6/${TOTAL}) jar file ..."
cd common/hystrix-turbine-mq
mvn clean package -DskipTests
progress "Building hystrix-turbine-mq(6/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/hystrix-turbine-mq -q .) ${REGPREFIX}/hystrix-turbine-mq:$(date -u "+%Y%m%d-%H%M%S")
cd -

#hello
progress "Buildinhg hello service(7/${TOTAL}) jar file ..."
cd service/hello
mvn clean package -DskipTests
progress "Building hello service(7/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/hello -q .) ${REGPREFIX}/hello:$(date -u "+%Y%m%d-%H%M%S")
cd -

#world
progress "Buildinhg world service(8/${TOTAL}) jar file ..."
cd service/world
mvn clean package -DskipTests
progress "Building world service(8/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/world -q .) ${REGPREFIX}/world:$(date -u "+%Y%m%d-%H%M%S")
cd -

#helloworld
progress "Buildinhg helloworld service(9/${TOTAL}) jar file ..."
cd service/helloworld
mvn clean package -DskipTests
progress "Building helloworld service(9/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/helloworld -q .) ${REGPREFIX}/helloworld:$(date -u "+%Y%m%d-%H%M%S")
cd -

#helloworld-feign
progress "Buildinhg helloworld-feign service(10/${TOTAL}) jar file ..."
cd service/helloworld-feign
mvn clean package -DskipTests
progress "Building helloworld-feign service(10/${TOTAL}) docker image ..."
docker tag $(docker build -t ${REGPREFIX}/helloworld-feign -q .) ${REGPREFIX}/helloworld-feign:$(date -u "+%Y%m%d-%H%M%S")
cd -

4.进入到项目目录springcloud-demo,执行bash images-build.sh进行批量编译打包

批量编译打包springcloud-demo.png

5.创建服务治理组件的docker-compose.yml,编写如下内容

version: "2"
services:

  #启动注册中心eureka-server集群 集中管理/服务注册/服务发现
  discovery1:
    container_name: discovery1
    image: 127.0.0.1:5000/billjiang/discovery
    ports:
      - "8761:8761"
    environment:
      - ADDITIONAL_EUREKA_SERVER_LIST=http://discovery2:8762/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=8761

  discovery2:
    container_name: discovery2
    image: 127.0.0.1:5000/billjiang/discovery
    ports:
      - "8762:8762"
    environment:
      - ADDITIONAL_EUREKA_SERVER_LIST=http://discovery1:8761/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=8762
    links:
      - discovery1

  #启动配置中心config-server集群 配置更新/配置集中管理/多环境配置
  config1:
    container_name: configserver1
    image: 127.0.0.1:5000/billjiang/configserver
    ports:
      - "8090:8090"
    environment:
      - EUREKA_SERVER_LIST=http://discovery1:8761/eureka/,http://discovery2:8762/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=8090
    links:
      - discovery1
      - discovery2

  config2:
    container_name: configserver2
    image: 127.0.0.1:5000/billjiang/configserver
    ports:
      - "8091:8091"
    environment:
      - EUREKA_SERVER_LIST=http://discovery1:8761/eureka/,http://discovery2:8762/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=8091
    links:
      - discovery1
      - discovery2

  #启动网关gateway,可配置成集群,使用nginx进行负载 智能路由/安全控制/负载均衡
  gateway:
    container_name: gateway
    image: 127.0.0.1:5000/billjiang/gateway
    ports:
      - "8086:8086"
    environment:
      - EUREKA_SERVER_LIST=http://discovery1:8761/eureka/,http://discovery2:8762/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=8086
    links:
      - discovery1
      - discovery2

  # 启动seluth+zipkin zipkin服务跟踪/依赖可视化
  track:
    container_name: track
    image: 127.0.0.1:5000/billjiang/track
    ports:
      - "9411:9411"
    environment:
      - EUREKA_SERVER_LIST=http://discovery1:8761/eureka/,http://discovery2:8762/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=9411
    links:
      - discovery1
      - discovery2

   # hystrix
  # 启动hystrix-dashboard
  hystrix-dashboard:
    container_name: hystrix-dashboard
    image: 127.0.0.1:5000/billjiang/hystrix-dashboard
    ports:
      - "8087:8087"
    environment:
      - EUREKA_SERVER_LIST=http://discovery1:8761/eureka/,http://discovery2:8762/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=8087
    links:
      - discovery1
      - discovery2

  # 启动hystrix-turbine-mq  基于消息中间件的实时性能数据收集
  hystrix-turbine-mq:
    container_name: hystrix-turbine-mq
    image: 127.0.0.1:5000/billjiang/hystrix-turbine-mq
    ports:
      - "8089:8089"
    environment:
      - EUREKA_SERVER_LIST=http://discovery1:8761/eureka/,http://discovery2:8762/eureka/
      - SPRING_PROFILES_ACTIVE=docker
      - SERVER_PORT=8089
    links:
      - discovery1
      - discovery2

  mysql:
    container_name: mysql
    image: mysql:5.7
    environment:
      - MYSQL_ROOT_PASSWORD=passw0rd
      - MYSQL_DATABASE=foodb
      - MYSQL_USER=user1
      - MYSQL_PASSWORD=passw0rd

6.启动服务治理的docker-compose.yml

在springcloud-demo根目录下,使用docker-compose up启动服务编排,如下界面所示:

服务治理服务编排启动1.png

启动后,打开注册中心地址,查看已经启动的服务:

已经启动的服务列表.png

7.连接外部docker容器

配置中心使用到了gitlab, 服务跟踪track使用了rabbitmq,这两个容器都不在docker-compose之中,要使得能够互相连通,要把这两个容器也加入到springclouddemo_default网络。

docker network connect springclouddemo_default gitlab
docker network connect springclouddemo_default rabbitmq

使用docker network inspect springclouddemo_default可以查看到已经加入网络的容器。

8.启动服务示例编排docker-compose.yml

进入到service目录,使用docker-compose up启动服务示例编排,如下所示:

服务示例编排1.png

服务示例编排2

9.在Eureka Server查看新增的服务

新增注册服务.png

10.可以使用如下命令对服务进行扩容

scale扩容.png

刷新Eureka Server,可以看到服务已经扩展到三个节点。

扩容后.png

作者:billJiang 链接:https://www.jianshu.com/p/05518d252186 来源:简书 简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。

原文发布于微信公众号 - DevOps时代(DevOpsTimes)

原文发表时间:2019-04-24

本文参与腾讯云自媒体分享计划,欢迎正在阅读的你也加入,一起分享。

发表于

我来说两句

0 条评论
登录 后参与评论

扫码关注云+社区

领取腾讯云代金券