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👨‍🎓 个人介绍：本人是一名后端Java开发工程师，坐标北京 ~
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1. 目录结构 🚀

• ⭐ docker-compose.yml：/opt/pro_xx/jar
• ⭐ Dockerfile：/opt/pro_xx/jar/springboot-basis
• ⭐ springboot-basis.jar: /opt/pro_xx/jar/springboot-basis

[root@localhost jar]# ls
docker-compose.yml  springboot-basis

[root@localhost jar]# ls springboot-basis
Dockerfile  springboot-basis.jar

2. Dockerfile 🚀

# AdoptOpenJDK 停止发布 OpenJDK 二进制，而 Eclipse Temurin 是它的延伸，提供更好的稳定性
FROM eclipse-temurin:8-jre

## 创建目录，并使用它作为工作目录
RUN mkdir -p /opt/pro_xx/jar/springboot-basis
WORKDIR /opt/pro_xx/jar/springboot-basis
## 将后端项目的 Jar 文件，复制到镜像中，前面是当前目录，后面是镜像中目录
COPY ./springboot-basis/springboot-basis.jar springboot-basis.jar

## 设置 TZ 时区
## 设置 JAVA_OPTS 环境变量，可通过 docker run -e "JAVA_OPTS=" 进行覆盖
ENV TZ=Asia/Shanghai JAVA_OPTS="-Xms128m -Xmx128m"

## 暴露后端项目的 8082 端口
EXPOSE 8082

## 启动后端项目
## -Djava.security.egd=file:/dev/./urandom 是一个 Java 系统属性设置，用于指定随机数生成器的源
## /dev/urandom：这是一个非阻塞型随机数生成器
CMD java ${JAVA_OPTS} -Xms128m -Xmx128m -Djava.security.egd=file:/dev/./urandom -jar springboot-basis.jar

3. docker-compose 🚀

# version: '3.8'  新版本不需要指定 
services:  
  springboot-basis:  
    build:  
      context: .  # 指定docker-compose.yml文件所在的目录为构建上下文  
      dockerfile: springboot-basis/Dockerfile  # 指定app1目录下的Dockerfile  
    image: springboot-basis-image  # 为构建的镜像指定一个名称  
    container_name: springboot-basis-container  # 为容器指定一个名称（可选）  
    ports:  
      - "8082:8082"  
    networks:  
      - app_network  
    restart: unless-stopped  # 重启策略  
# 网络
networks:  
  app_network:  
    driver: bridge

4. 执行命令 🚀

[root@localhost jar]# pwd
/opt/pro_xx/jar

[root@localhost jar]# ls
docker-compose.yml  springboot-basis

[root@localhost jar]# docker-compose up -d
[+] Running 2/2
 ✔ Network jar_app_network               Created                                                                              0.2s
 ✔ Container springboot-basis-container  Started                                                                              0.2s
 
[root@localhost jar]# docker-compose ps
NAME                         IMAGE                    COMMAND                  SERVICE            CREATED              STATUS              PORTS
springboot-basis-container   springboot-basis-image   "/__cacert_entrypoin…"   springboot-basis   About a minute ago   Up About a minute   0.0.0.0:8082->8082/tcp, :::8082->8082/tcp

🌈 重新构建

[root@localhost jar]# docker-compose down
[+] Running 2/2
 ✔ Container springboot-basis-container  Removed                                                                             10.1s
 ✔ Network jar_app_network               Removed                                                                              0.1s

# 这里需要加--build才能重新构建镜像，否则使用已存在镜像
[root@localhost jar]# docker-compose up --build -d
[+] Building 18.2s (9/9) FINISHED                                                                              docker:default
 => [springboot-basis internal] load build definition from Dockerfile                                                         0.0s
 => => transferring dockerfile: 1.02kB                                                                                        0.0s
 => [springboot-basis internal] load metadata for docker.io/library/eclipse-temurin:8-jre                                    18.0s
 => [springboot-basis internal] load .dockerignore                                                                            0.0s
 => => transferring context: 2B                                                                                               0.0s
 => [springboot-basis 1/4] FROM docker.io/library/eclipse-temurin:8-jre@sha256:fb70a1d7a31c4e1fe5efdca36dc35cfe7e593a3be70d2  0.0s
 => [springboot-basis internal] load build context                                                                            0.1s
 => => transferring context: 24.92MB                                                                                          0.1s
 => CACHED [springboot-basis 2/4] RUN mkdir -p /opt/pro_xx/jar/springboot-basis                                               0.0s
 => CACHED [springboot-basis 3/4] WORKDIR /opt/pro_xx/jar/springboot-basis                                                    0.0s
 => [springboot-basis 4/4] COPY ./springboot-basis/springboot-basis.jar springboot-basis.jar                                  0.1s
 => [springboot-basis] exporting to image                                                                                     0.0s
 => => exporting layers                                                                                                       0.0s
 => => writing image sha256:26f4766dec23d1f053e5a8a6d8afbb2a58beeb9511752ab7f611edcfb2c20bed                                  0.0s
 => => naming to docker.io/library/springboot-basis-image                                                                     0.0s
[+] Running 2/2
 ✔ Network jar_app_network               Created                                                                              0.1s
 ✔ Container springboot-basis-container  Started                                                                              0.2s

5. 开通防火墙端口 🚀

🍨 如果需要对外访问，需要开通服务器防火墙

⚡ 推荐参考：CentOS 系统如何在防火墙开启端口

sudo firewall-cmd --zone=public --permanent --add-port=8082/tcp
sudo firewall-cmd --reload
sudo firewall-cmd --zone=public --list-ports