十四、Docker 微服务实战

1、创建SpringBoot项目 hello_docker

1.1、项目结构

 1.2、项目所有代码

• 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.liuchao</groupId>
    <artifactId>hello_docker</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>hello_docker</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.0</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <spring-cloud-alibaba.version>2021.1</spring-cloud-alibaba.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!--spring cloud alibaba-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-deploy-plugin</artifactId>
                <!--deploy 时忽略-->
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

• application.yml

## 激活对应的profile
spring:
  profiles:
    active: local
  application:
    name: hello_docker
---
#################################本地环境##########################
server:
  port: 6001
  config:
    activate:
      on-profile: local
---

• TestController

package com.liuchao.liuchao.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author liuchao
 * @date 2022/12/13
 */
@RestController
@RequestMapping("/test")
public class TestController {

    @RequestMapping("/test01")
    public String test01() {
        return "01";
    }
}

• DockerApplication

package com.liuchao.liuchao;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author liuchao
 * @date 2022/12/13
 */
@SpringBootApplication
public class DockerApplication {
    public static void main(String[] args) {
        SpringApplication.run(DockerApplication.class, args);
    }
}

2、编写Dockerfile文件

Dockerfile中几个点

• 自动安装jdk1.8
• 将hello_word项目生成的jar上传至容器
• 启动hello_word.jar
• 暴露端口 我这块用的端口是6001，即暴露6001端口

Dockerfile内容

# 基础镜像使用java
FROM java:8

# 作者
MAINTAINER liuchao

# VOLUME 指定临时文件目录为/tmp，在主机/var/lib/docker目录下创建了一个临时文件并链接到容器的/tmp
VOLUME /tmp

# 将jar包添加到容器中并更名为hello_docker.jar
ADD hello_docker-1.0-SNAPSHOT.jar hello_docker.jar
# 运行jar包
RUN bash -c 'touch /hello_docker.jar'
ENTRYPOINT ["java","-jar","/hello_docker.jar"]

#暴露6001端口作为微服务
EXPOSE 6001 

3、构建镜像

4、创建并运行容器

命令：docker run -d -p 6001:6001 hello_docker:1.0

5、访问测试

至此Docker 打包SpringBoot项目为镜像，创建并运行容器成功