无法从springboot docker容器连接到mysql docker容器

Question

I want to connect from the sprinboot container to the mysql container but i get this error: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

I am using docker-compose.

This is my docker-compose file:

version: '3'
services:

  trips-db:
    image: "mysql"
    container_name: "trips-db"
    volumes:
        - newDatabase:/home/sharedData
    ports:
        - 49152:3306
    environment:
      - MYSQL_USER=adham
      - MYSQL_PASSWORD=123 
      - MYSQL_ROOT_PASSWORD=admin

  trips-app:
    build: ./Wasalny_BE
    container_name: trips-app
    ports:
        - 8080:8080
    links:
        - trips-db

volumes: 
  newDatabase:

This is my spring boot docker file:

FROM openjdk:8-jdk-alpine
COPY target/wasalny-0.0.1-SNAPSHOT.jar app.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/app.jar"]

This is my application.properties file:

spring.datasource.url= jdbc:mysql://trips-db:49152/wslny?allowPublicKeyRetrieval=true&useSSL=false&createDatabaseIfNotExist=true
spring.datasource.username= root
spring.datasource.password= admin
spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.hibernate.ddl-auto= update

I run using the following command form the terminal:

docker-compose up -d 
--force-recreate

Answer 1

Please create a docker.network and attach it into the compose file.

Create a docker Network first like below.

docker.network create ext.network

Add.network settings into your yaml file as below and give a try

version: '3'
services:

  trips-db:
    image: "mysql"
    container_name: "trips-db"
    volumes:
        - newDatabase:/home/sharedData
    ports:
        - 49152:3306
    networks:
      - ext-network
    environment:
      - MYSQL_USER=adham
      - MYSQL_PASSWORD=123 
      - MYSQL_ROOT_PASSWORD=admin

  trips-app:
    build: ./Wasalny_BE
    container_name: trips-app
    ports:
        - 8080:8080
    networks:
      - ext-network
    links:
        - trips-db
        
networks:
  ext-network:
    external: true

volumes: 
  newDatabase: