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服務(wù) Docker 化

發(fā)布時間：2020-07-24 13:56:15 來源：網(wǎng)絡(luò) 閱讀：175 作者：程序員果果 欄目：編程語言

文章首發(fā)于公眾號《程序員果果》
地址：https://mp.weixin.qq.com/s/E_gJFbRaWOE-mnVR1lsYfQ

一、簡介

Docker的出現(xiàn)讓容器化技術(shù)得以普及，更快的部署和維護(hù)與Spring Cloud的結(jié)合，能讓我們不再像以前一樣為了某一個模塊的增加而服務(wù)器上大動干戈，還需要考慮環(huán)境的問題。在這一篇中會講到 SpringCloud 項(xiàng)目 Docker 化 。

二、創(chuàng)建一個 SpringCloud 項(xiàng)目

創(chuàng)建一個springcloud項(xiàng)目 ，包含eureka-server、service-hi、service-ribbon。

1. eureka-server 項(xiàng)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
eureka:
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://eureka-server:8761/eureka/
spring:
  application:
    name: eureka-server
EurekaServerApplication
@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

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

2. service-hi 項(xiàng)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:
    service-url:
      defaultZone: http://eureka-server:8761/eureka/
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 項(xiàng)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:
    service-url:
      defaultZone: http://eureka-server:8761/eureka/
HelloService
@Service
public class HelloService {

    @Autowired
    private RestTemplate restTemplate;

    public String hiService() {
        return restTemplate.getForObject( "http://SERVICE-HI/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、構(gòu)建鏡像

1. Dockerfile

編寫Dockerfile ，把項(xiàng)目構(gòu)建成鏡像，需要把 項(xiàng)目jar包 復(fù)制到 鏡像中，而且鏡像中要有java的運(yùn)行環(huán)境，所以現(xiàn)在給每個項(xiàng)目都創(chuàng)建一個Dockerfile，內(nèi)容如下：

eureka-server 項(xiàng)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"]

service-hi 項(xiàng)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"]

service-ribbon 項(xiàng)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"]

分別在各個項(xiàng)目根目錄下，通過 mvn packge 命令來，把項(xiàng)目打成jar包 ，并通過 docker build 命令來構(gòu)建鏡像：

mvn package -Dmaven.test.skip=true
docker build -t 項(xiàng)目名:版本號
例如：
docker build -t eureka-server:latest

我們通過 docker image 命令，查看我們本地的鏡像，發(fā)現(xiàn)鏡像已經(jīng)構(gòu)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

根據(jù)這三個鏡像運(yùn)行容器 ，來檢查服務(wù)容器化后 ，是否訪問正常，值得注意的是 注冊中心的地址為 http://eureka-server:8761/eureka/ ，我們使用容器名作為地址 ，這就需要，我們在啟動eureka-server 的容器時，指定指定一個名稱eureka-server ，否則會找不到注冊中心。

docker run -it -d -p 8761:8761 --name eureka-server 41997de8006f
docker run -it -d --name service-hi f893c76be99d
docker run -it -d -p 8764:8764 --name service-ribbon 81b61a359e23

訪問 127.0.0.1:8761 注冊中心正常。

服務(wù) Docker 化

訪問 127.0.0.1:8764/hi 服務(wù)正常。

服務(wù) Docker 化

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服務(wù) Docker 化

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