Spring boot microservices and Docker, unable to connect to database - spring-boot

Question

I'm writing a test app in microservices to learn Spring Boot. I'm done with the app and looking to deploy it on AWS using docker/docker-compose to host each microservices.
I'm unable to connect any of the Spring Boot instances to their Mysql database. I've been stuck on it for a few days and I can't see what's wrong.
Here is my docker-compose.yml
version: "3.3"
services:
card_mysql:
image: "mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: "root"
MYSQL_DATABASE: "cards"
ports:
- "33061:3306"
auth_mysql:
image: "mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: "root"
MYSQL_DATABASE: "auth"
ports:
- "33062:3306"
market_mysql:
image: "mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: "root"
MYSQL_DATABASE: "market"
ports:
- "33063:3306"
user_mysql:
image: "mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: "root"
MYSQL_DATABASE: "user"
ports:
- "33064:3306"
adminer:
image: adminer
restart: always
ports:
- 8000:8080
user:
image: "openjdk:11"
restart: always
entrypoint: java -jar /app/services/user/target/cardmarket-user-0.0.1-SNAPSHOT.jar
volumes:
- ./:/app
depends_on:
- "user_mysql"
card:
image: "openjdk:11"
restart: always
entrypoint: java -jar /app/services/card/target/cardmarket-card-0.0.1-SNAPSHOT.jar
volumes:
- ./:/app
depends_on:
- "card_mysql"
market:
image: "openjdk:11"
restart: always
entrypoint: java -jar /app/services/market/target/cardmarket-market-0.0.1-SNAPSHOT.jar
volumes:
- ./:/app
depends_on:
- "market_mysql"
proxy:
image: "openjdk:11"
restart: always
entrypoint: java -jar /app/zuul-proxy/target/zuul-proxy-0.0.1-SNAPSHOT.jar
volumes:
- ./:/app
auth:
image: "openjdk:11"
restart: always
entrypoint: java -jar /app/zuul-proxy/zuul-proxy-0.0.1-SNAPSHOT.jar
volumes:
- ./:/app
depends_on:
- "auth_mysql"
Here are each of my spring datasource settings:
user application.properties
spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://user_mysql:3306/user
spring.datasource.initialization-mode=always
spring.datasource.username=root
spring.datasource.password=root
market application.properties
spring.jpa.hibernate.ddl-auto=create-drop
spring.datasource.url=jdbc:mysql://market_mysql:3306/market
spring.datasource.initialization-mode=always
spring.datasource.username=root
spring.datasource.password=root
Auth application.properties
spring.jpa.hibernate.ddl-auto=create-drop
spring.datasource.url=jdbc:mysql://auth_mysql:3306/auth
spring.datasource.initialization-mode=always
spring.datasource.username=root
spring.datasource.password=root
Card application.properties
spring.jpa.hibernate.ddl-auto=create-drop
spring.datasource.url=jdbc:mysql://card_mysql:3306/cards
spring.datasource.initialization-mode=always
spring.datasource.username=root
spring.datasource.password=root
I'm sure it is something small I'm missing or misunderstood, but I can't figure out what.
Edit 1
I ran a couple more tests but still wasn't able to figure out what's wrong.
I commented out everything but the card and card_mysql containers. The spring boot instance throw an exception for every configuration possible (using docker dns name, localhost, shared and network ip), none of them seems to work.
The two containers do communicate, I can ping between them using the dns name.
I'm using docker-desktop with wsl and deploy my containers on a wsl Ubuntu 20.04. I haven't tried on an actual Linux machine.
I've also tried to make the spring boot instance wait for the mysql one using wait-for-it.sh, it does wait correctly but the exception still occurs.
Here is parts of the exception spring boot triggers:
2021-05-16 12:23:48.948 INFO 1 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2021-05-16 12:23:50.277 ERROR 1 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization.
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
...
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
...
Caused by: java.net.ConnectException: Connection refused (Connection refused)
Edit 2
I tried having just one instance of spring boot and mysql and linking them using a network, unfortunately the exception still triggers. The two containers still pings. Here is the docker-compose I used for this test:
version: "3.9"
services:
card_mysql:
image: "mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: "root"
MYSQL_DATABASE: "cards"
networks:
- "card_network"
card:
image: "openjdk:11"
restart: always
entrypoint: ["/app/wait-for-it.sh", "card_mysql:3306", "--", "java", "-jar", "/app/services/card/target/cardmarket-card-0.0.1-SNAPSHOT.jar"]
# entrypoint: ["/app/wait-for-it.sh", "card_mysql:3306", "--", "ping", "card_mysql"]
volumes:
- ./:/app
depends_on:
- "card_mysql"
networks:
- "card_network"
networks:
card_network: {}

Answer 1

Hi Spinarial please add network and gather it all in one network
version: "3.4"
services:
springMvcRestApi:
image: springbootproject:0.0.1
container_name: app
networks:
- postgres
ports:
- 8085:8085
depends_on:
- postgres
- pgadmin
links:
- postgres
environment:
SPRING_DATASOURCE_URL: jdbc:postgresql://postgres:5432/reactiveDbcd?createDatabaseIfNotExist=true
SPRING_DATASOURCE_USERNAME: postgres
SPRING_DATASOURCE_PASSWORD: 12345
postgres:
container_name: postgres
image: postgres
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: 12345
PGDATA: /data/postgres
volumes:
- postgres:/data/postgres
expose:
- 5432
ports:
- 5432:5432
networks:
- postgres
restart: unless-stopped
pgadmin:
container_name: pgadmin_container
image: dpage/pgadmin4
environment:
PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL:-pgadmin4#pgadmin.org}
PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD:-admin}
PGADMIN_CONFIG_SERVER_MODE: 'False'
volumes:
- pgadmin:/root/.pgadmin
ports:
- "${PGADMIN_PORT:-80}:80"
networks:
- postgres
restart: unless-stopped
networks:
postgres:
driver: bridge
volumes:
postgres:
pgadmin: