Docker MySQL - 无法使用 docker-compose 将 Spring Boot 应用程序连接到 docker 容器中的 MySQL 数据库

Question

尝试连接 Springboot 应用程序 dicom_viewer: Imagename: sample 与 Mysql: Imagename: pb_mysql 在 docker 容器中运行。错误：com.mysql.cj.jdbc.exceptions.CommunicationsException：通信链接失败。

Application.properties 文件：

#MySQL database connection strings
spring.datasource.url=jdbc:mysql://pb_mysql:3306/test?autoReconnect=true&useSSL=false
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.username=pb
spring.datasource.password=pb@123

#JPA property settings
spring.jpa.hibernate.ddl-auto=update
spring.jpa.properties.hibernate.show_sql=true

Docker-compose 文件：

version: '2'
services:
  pb_mysql:
    container_name: pb_mysql
    restart: always
    image: mysql/mysql-server:latest
    environment:
      MYSQL_ROOT_PASSWORD: 'root123' # TODO: Change this
    volumes:
      - sql-datavolume:/var/lib/mysql
  patient_browser:
    container_name: patient_browser
    restart: always
    image: patient_browser
    ports: 
      - 8080:8080
    volumes:
      - ./dicom_images:/usr/src/app/dicom_images
  springboot-image:
    container_name: dicom_viewer
    restart: always
    image: sample
    ports: 
      - 8081:8080
volumes:
  sql-datavolume:
networks:
  f4:
    driver: bridge

Dockerfile：

FROM openjdk:8-jdk-alpine

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY ./target/springboot-image-0.0.1-SNAPSHOT.jar /usr/src/app

COPY . /usr/src/app

EXPOSE 8080

ENTRYPOINT ["java","-jar","springboot-image-0.0.1-SNAPSHOT.jar"]

Database: test, table: pm_of_india

Docker images, docker ps -a

docker-compose up

Error: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

Answer 1

有两点需要注意，

depends_on

您在 yaml 配置文件中保持 pb_mysql 领先于其他人。这并不能确保 mysql-server 在其他服务器之前启动并运行。

你要使用depends_on，所以会先启动依赖的pb_mysql。

ports

您使用的是桥接网络，因此您需要将 mysql-server 的 3306 映射到 3306。

version: '2'
services:
  patient_browser:
    container_name: patient_browser
    restart: always
    image: patient_browser
    ports: 
      - 8080:8080
    volumes:
      - ./dicom_images:/usr/src/app/dicom_images
      - 8081:8080
    depends_on:
      - pb_mysql
  springboot-image:
    container_name: dicom_viewer
    restart: always
    image: sample
    ports: 
      - 8081:8080
    depends_on: # Let mysql-server start first
      - pb_mysql
  pb_mysql:
    container_name: pb_mysql
    ports:
      - "3306:3306" # Port mapping.
    restart: always
    image: mysql/mysql-server:latest
    environment:
      MYSQL_ROOT_PASSWORD: 'root123' # TODO: Change this
    volumes:
      - sql-datavolume:/var/lib/mysql
volumes:
  sql-datavolume:
networks:
  f4:
    driver: bridge

除非绝对需要，否则我会避免使用restart: always。

其余的对我来说看起来不错。如果解决了，请告诉我。

Answer 2

您没有引用您的网络。 尝试将其添加到您的服务中，即：

services:
  pb_mysql:
     networks:
          - f4

...