DockerSwarm 微服务部署

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地址：https://mp.weixin.qq.com/s/nWpbqAheuTh45dWsgszieA

一、简介

之前《服务Docker化》中，使用 docker-compose.yml 来一次配置启动多个容器，在 Swarm 集群中也可以使用 compose 文件 （docker-compose.yml） 来配置、启动多个服务。
在《DockerSwarm集群环境搭建》中，我们使用docker service create 来部署服务时，一次只能部署一个服务，这一节就讲解 DockerSwarm 集群环境中， 使用 docker-compose.yml 一次启动多个关联的服务。

二、创建 SpringCloud 项目

创建一个springcloud项目 ，包含eureka-server、service-hi、service-ribbon。

1. eureka-server 项目

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.gf</groupId> <artifactId>eureka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>eureka-server</name> <description>Demo project for Spring Boot</description> <parent> <groupId>com.gf</groupId> <artifactId>chapter02</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>

application.yml

server: port: 8761 spring: application: name: eureka-server eureka: client: register-with-eureka: false fetch-registry: false service-url: defaultZone: http://eureka-server:8761/eureka/ instance: prefer-ip-address: true instance-id: eureka-server:8761

EurekaServerApplication

@EnableEurekaServer @SpringBootApplication public class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run(EurekaServerApplication.class, args); } }

2. service-hi 项目

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.gf</groupId> <artifactId>service-hi</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>service-hi</name> <description>Demo project for Spring Boot</description> <parent> <groupId>com.gf</groupId> <artifactId>chapter02</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>

application.yml

server: port: 8763 spring: application: name: service-hi eureka: client: serviceUrl: defaultZone: http://eureka-server:8761/eureka/ instance: prefer-ip-address: true instance-id: service-hi:8763

ServiceHiApplication

@EnableEurekaClient @SpringBootApplication @RestController public class ServiceHiApplication { public static void main(String[] args) { SpringApplication.run(ServiceHiApplication.class, args); } @Value( "${server.port}" ) private String port; @GetMapping("/hi") public String hi() { return "hello , port is " + port; } }

3. service-ribbon 项目

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.gf</groupId> <artifactId>service-ribbon</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>service-ribbon</name> <description>Demo project for Spring Boot</description> <parent> <groupId>com.gf</groupId> <artifactId>chapter02</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>

application.yml

server: port: 8764 spring: application: name: service-ribbon eureka: client: serviceUrl: defaultZone: http://eureka-server:8761/eureka/ instance: prefer-ip-address: true instance-id: eureka-server:8764

HelloService

@Service public class HelloService { @Autowired private RestTemplate restTemplate; public String hiService() { return restTemplate.getForObject( "http://service-hi:8763/hi" , String.class ); } }

HelloControler

@RestController public class HelloControler { @Autowired private HelloService helloService; @GetMapping(value = "/hi") public String hi() { return helloService.hiService(); } }

ServiceRibbonApplication

@SpringBootApplication @EnableEurekaClient @EnableDiscoveryClient public class ServiceRibbonApplication { public static void main(String[] args) { SpringApplication.run(ServiceRibbonApplication.class, args); } @Bean @LoadBalanced RestTemplate restTemplate() { return new RestTemplate(); } }

三、构建镜像

1. Dockerfile

编写Dockerfile ，把项目构建成镜像，需要把 项目jar包 复制到 镜像中，而且镜像中要有java的运行环境，所以现在给每个项目都创建一个Dockerfile，内容如下：

eureka-server 项目的 Dockerfile

FROM hub.gf.com:9090/jdk/openjdk:8-jre MAINTAINER gf gf@163.com COPY target/eureka-server-0.0.1-SNAPSHOT.jar /eureka-server-0.0.1-SNAPSHOT.jar ENTRYPOINT ["java" , "-jar" , "/eureka-server-0.0.1-SNAPSHOT.jar"]

service-hi 项目的 Dockerfile

FROM hub.gf.com:9090/jdk/openjdk:8-jre MAINTAINER gf gf@163.com COPY target/service-hi-0.0.1-SNAPSHOT.jar /service-hi-0.0.1-SNAPSHOT.jar ENTRYPOINT ["java" , "-jar" , "/service-hi-0.0.1-SNAPSHOT.jar"]

service-ribbon 项目的 Dockerfile

#!/usr/bin/env bash mvn package -Dmaven.test.skip=true docker build -t hub.gf.com:9090/springcloud-ribbon/service-ribbon:latest . docker login -u admin -p Harbor12345 hub.gf.com:9090 docker push hub.gf.com:9090/springcloud-ribbon/service-ribbon:latest

2. 创建 build.sh

为了方便，三个项目根目录下创建 build.sh 脚本，来一键执行项目的打jar包、构建镜像、推送到私有仓库。

eureka-server 项目的 build.sh

#!/usr/bin/env bash mvn package -Dmaven.test.skip=true docker build -t hub.gf.com:9090/springboot-ribbon/eureka-server:latest . docker login -u admin -p Harbor12345 hub.gf.com:9090 docker push hub.gf.com:9090/springboot-ribbon/eureka-server:latest

service-hi 项目的 build.sh

#!/usr/bin/env bash mvn package -Dmaven.test.skip=true docker build -t hub.gf.com:9090/springboot-ribbon/service-hi:latest . docker login -u admin -p Harbor12345 hub.gf.com:9090 docker push hub.gf.com:9090/springboot-ribbon/service-hi:latest

service-ribbon 项目的 build.sh

#!/usr/bin/env bash mvn package -Dmaven.test.skip=true docker build -t hub.gf.com:9090/springboot-ribbon/service-ribbon:latest . docker login -u admin -p Harbor12345 hub.gf.com:9090 docker push hub.gf.com:9090/springboot-ribbon/service-ribbon:latest

分别执行三个 build.sh 脚本，这样私有仓库就有三个项目的镜像了，如图：

三、部署服务

1. 启动集群环境

启动之前搭建好的 docker swarm 集群环境：

docker-machine start myvm-1 myvm-2 myvm-3

要在管理节点下部署服务，所以需要知道哪台是管理节点，随便连接一台机器，通过 docker node 命令查看节点信息：

docker-machine ssh myvm-1

docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION ib1498ex2q18i7gznb2zgicqq * myvm-1 Ready Active Leader 18.09.1-beta2 vels0fe3eh5s5cxj1s573v9wx myvm-2 Ready Active Reachable 18.09.1-beta2 obxnnqelh4p16wajrwvyn6j8v myvm-3 Ready Active Reachable 18.09.1-beta2

myvm-1 就是管理节点，不需要切换节点了。

2. 编写 services.yml

之后用 docker stack 部署服务，所以需要编写服务编排文件，内容如下：

version: "3.4" services: eureka-server: image: hub.gf.com:9090/springcloud-ribbon/eureka-server:latest deploy: endpoint_mode: vip resources: limits: cpus: "0.5" memory: "1024M" ports: - "8761:8761" service-hi: image: hub.gf.com:9090/springcloud-ribbon/service-hi:latest deploy: endpoint_mode: vip resources: limits: cpus: "0.5" memory: "1024M" ports: - "8763:8763" depends_on: - eureka-server service-ribbon: image: hub.gf.com:9090/springcloud-ribbon/service-ribbon:latest deploy: endpoint_mode: vip resources: limits: cpus: "0.5" memory: "1024M" ports: - "8764:8764" depends_on: - eureka-server - service-hi networks: default: external: name: my-overlay

文件详细说明，这里就不说了，可以网上查一下。

3. 启动服务

通过 docker stack deploy 命令 启动服务：

docker stack deploy -c services.yml ms

通过 docker service ls 查看服务启动状态：

docker service ls ID NAME MODE REPLICAS IMAGE PORTS q99gd5rquv3f ms_eureka-server replicated 1/1 hub.gf.com:9090/springcloud-ribbon/eureka-server:latest *:8761->8761/tcp wjsv5s6fce6k ms_service-hi replicated 1/1 hub.gf.com:9090/springcloud-ribbon/service-hi:latest *:8763->8763/tcp zjwe7cnpn42y ms_service-ribbon replicated 1/1 hub.gf.com:9090/springcloud-ribbon/service-ribbon:latest *:8764->8764/tcp

服务启动后 ，访问 192.168.99.100:8761 , 192.168.99.100:8763/hi , 192.168.99.100:8764/hi ，都可以正常访问，说明已经部署成功了。