DockerSwarm 微服务部署
2019-05-31 09:39
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文章首发于公众号《程序员果果》
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。
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