第十篇 : DockerSwarm 微服务部署
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
<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>4.0.0modelVersion>
<groupId>com.gfgroupId>
<artifactId>eureka-serverartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>eureka-servername>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>com.gfgroupId>
<artifactId>chapter02artifactId>
<version>0.0.1-SNAPSHOTversion>
parent>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-netflix-eureka-serverartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
<executions>
<execution>
<goals>
<goal>repackagegoal>
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
<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>4.0.0modelVersion>
<groupId>com.gfgroupId>
<artifactId>service-hiartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>service-hiname>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>com.gfgroupId>
<artifactId>chapter02artifactId>
<version>0.0.1-SNAPSHOTversion>
parent>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-netflix-eureka-serverartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
<executions>
<execution>
<goals>
<goal>repackagegoal>
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
<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>4.0.0modelVersion>
<groupId>com.gfgroupId>
<artifactId>service-ribbonartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>service-ribbonname>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>com.gfgroupId>
<artifactId>chapter02artifactId>
<version>0.0.1-SNAPSHOTversion>
parent>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-netflix-eureka-serverartifactId>
dependency>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-starter-netflix-ribbonartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
<executions>
<execution>
<goals>
<goal>repackagegoal>
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 [email protected]
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 [email protected]
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。
