服务 Docker 化

阳光穿透心脏的1/2处 2022-01-20 04:27 199阅读 0赞

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> 
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## 一、简介 ##

Docker的出现让容器化技术得以普及，更快的部署和维护与Spring Cloud的结合，能让我们不再像以前一样为了某一个模块的增加而服务器上大动干戈，还需要考虑环境的问题。在这一篇中会讲到 SpringCloud 项目 Docker 化 。

## 二、创建一个 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>
    复制代码

#### application.yml ####

server:
      port: 8761
    eureka:
      client:
        register-with-eureka: false
        fetch-registry: false
        service-url:
          defaultZone: http://eureka-server:8761/eureka/
    spring:
      application:
        name: eureka-server
    复制代码

#### EurekaServerApplication ####

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

### 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>
    复制代码

#### application.yml ####

server:
      port: 8763
    spring:
      application:
        name: service-hi
    eureka:
      client:
        service-url:
          defaultZone: http://eureka-server:8761/eureka/
    复制代码

#### 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;
    	}
    
    }
    复制代码

### 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>
    复制代码

#### application.yml ####

server:
      port: 8764
    spring:
      application:
        name: service-ribbon
    eureka:
      client:
        service-url:
          defaultZone: http://eureka-server:8761/eureka/
    复制代码

#### HelloService ####

@Service
    public class HelloService {
    
        @Autowired
        private RestTemplate restTemplate;
    
        public String hiService() {
            return restTemplate.getForObject( "http://SERVICE-HI/hi" , String.class );
        }
    
    }
    复制代码

#### HelloControler ####

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

#### 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();
    	}
    }
    复制代码

## 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 192.168.31.143:9090/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"]
    复制代码

**service-hi 项目的 Dockerfile**

FROM openjdk:8-jre
    
    MAINTAINER gf 782969359@qq.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"]
    复制代码

**service-ribbon 项目的 Dockerfile**

FROM openjdk:8-jre
    
    MAINTAINER gf gf@163.com
    
    COPY target/service-ribbon-0.0.1-SNAPSHOT.jar /service-ribbon-0.0.1-SNAPSHOT.jar
    
    ENTRYPOINT ["java" , "-jar" , "/service-ribbon-0.0.1-SNAPSHOT.jar"]
    复制代码

分别在各个项目根目录下，通过 mvn packge 命令来，把项目打成jar包 ，并通过 docker build 命令来构建镜像：

mvn package -Dmaven.test.skip=true
    复制代码

docker build -t 项目名:版本号
    例如：
    docker build -t eureka-server:latest
    复制代码

我们通过 docker image 命令，查看我们本地的镜像，发现镜像已经构建到本地了：

$ docker images
    REPOSITORY                                             TAG                 IMAGE ID            CREATED             SIZE
    service-ribbon                                         latest              81b61a359e23        39 hours ago        487MB
    service-hi                                             latest              f893c76be99d        39 hours ago        487MB
    eureka-server                                          latest              41997de8006f        40 hours ago        487MB
    openjdk                                                8-jre               e01608fba686        12 days ago         442MB
    复制代码

根据这三个镜像运行容器 ，来检查服务容器化后 ，是否访问正常，**值得注意的是 注册中心的地址为 [http://eureka-server:8761/eureka/][http_eureka-server_8761_eureka] ，我们使用容器名作为地址 ，这就需要，我们在启动eureka-server 的容器时，指定指定一个名称eureka-server ，否则会找不到注册中心。**

docker run -it -d -p 8761:8761 --name eureka-server 41997de8006f
    复制代码

docker run -it -d --name service-hi f893c76be99d
    复制代码

docker run -it -d -p 8764:8764 --name service-ribbon 81b61a359e23
    复制代码

访问 127.0.0.1:8761 注册中心正常。

访问 127.0.0.1:8764/hi 服务正常。

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