12-Docker发布微服务

12-Docker发布微服务

Docker发布微服务

搭建SpringBoot项目

• 新建一个SpringBoot项目

• 选择依赖项Spring Web和Spring Boot Actuator

• 在com.qi.docker_boot下创建controller目录，并在该目录下创建OrderController的java类

• OrderControllerjava类的内容如下：

package com.qi.docker_boot.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.UUID;
/**
 * @ClassName OrderController
 * @Description TODO
 * @Author Bowen
 * @Date 2024/10/30 0:01
 * @Version 1.0
 **/
@RestController
public class OrderController {
    @Value("${server.port}")
    private String port;

    @RequestMapping("/order/docker")
    public String helloDocker() {
        return "hello world \t" + port + "\t" + UUID.randomUUID().toString();
    }

    @RequestMapping(value = "/order/index", method = RequestMethod.GET)
    public String index() {
        return "服务端口号：" + "\t" + port + "\t" + UUID.randomUUID().toString();
    }
}

• 修改pom.xml文件：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.qi</groupId>
    <artifactId>docker_boot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>docker_boot</name>
    <description>docker_boot</description>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <configuration>
                    <mainClass>com.qi.docker_boot.DockerBootApplication</mainClass>
                    <skip>false</skip>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

• 修改配置文件application.properties

# 应用服务 WEB 访问端口
server.port=6001

• 查看主启动类（自动生成的）

package com.qi.docker_boot;

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

@SpringBootApplication
public class DockerBootApplication {

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

}

• 在IDEA中运行并查看

• 查看Web端

http://127.0.0.1:6001/order/docker

http://127.0.0.1:6001/order/index

在IDEA中运行没有问题时，将其使用maven的package打成jar包

发布微服务项目到Docker容器

• 将项目jar包上传到服务器

• 编写Dockerfile

FROM openjdk:8
MAINTAINER qi

# 在主机 /var/lib/docker目录下创建一个临时文件，并链接到容器的 /tmp
VOLUME /tmp

# 将jar包添加到容器中，并命名为 springboot_docker.jar
ADD docker_boot-0.0.1-SNAPSHOT.jar /springboot_docker.jar
# 运行jar包
RUN bash -c 'touch /springboot_docker.jar'
ENTRYPOINT ["java", "-jar", "/springboot_docker.jar"]

# SpringBoot项目配置的端口号为6001，需要将6001暴露出去
EXPOSE 6001

• 构建镜像

docker build -t springboot_docker:1.0 .

• 启动容器

docker run -d -p 6001:6001 --name springboot springboot_docker:1.0

查看Web

http://192.168.149.142:6001/order/docker

http://192.168.149.142:6001/order/index

http://ip:6001/order/index中的ip使用ifconfig查找

你可能会遇到以下问题：

jdk8无法pull

错误代码

[root@docker spring-docker]# docker build -t springboot_docker:1.0 .
[+] Building 63.3s (2/2) FINISHED                                                                                                                   docker:default
 => [internal] load build definition from Dockerfile                                                                                                          0.0s
 => => transferring dockerfile: 558B                                                                                                                          0.0s
 => ERROR [internal] load metadata for docker.io/library/openjdk:8-oracle                                                                                    63.2s
------
 > [internal] load metadata for docker.io/library/openjdk:8-oracle:
------
Dockerfile:1
--------------------
   1 | >>> FROM openjdk:8-oracle
   2 |     MAINTAINER qi
   3 |     
--------------------
ERROR: failed to solve: openjdk:8-oracle: failed to do request: Head "https://registry.hub.docker.com/v2/library/openjdk/manifests/8-oracle?ns=docker.io": dial tcp 65.49.26.97:443: connect: connection refused

解决方案

使用代理下载

成功下载示例

jar包无法启动

错误代码

docker_boot-0.0.1-SNAPSHOT.jar中没有主清单属性

解决方法

更改pom.xml文件，然后重新构建即可