Can't connect to mysql docker container from springboot docker container - mysql

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: