How to connect to a postgres database when having two docker-compose files? - postgresql

Question

First I have built an image using Dockerfile:
FROM openjdk:8-jdk-alpine
ARG JAR_FILE=target/*-SNAPSHOT.jar
ADD ${JAR_FILE} app.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/app.jar"]
as I have two docker-compose files one for production:
version: "3"
services:
app:
image: "demo:latest"
container_name: demo-production-api
restart: always
depends_on:
- "productiondb"
environment:
- SPRING_DATASOURCE_URL=jdbc:postgresql://productiondb:5432/testdb
- SPRING_DATASOURCE_HIKARI_JDBC_URL=jdbc:postgresql://productiondb:5432/testdb
- SPRING_DATASOURCE_USER=tester
- SPRING_DATASOURCE_PASSWORD=test
- SPRING_JPA_HIBERNATE_DDL_AUTO=update
ports:
- "8440:8443"
productiondb:
image: "postgres:latest"
container_name: productiondb
ports:
- "5430:5432"
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
volumes:
- postgres-db-production:/usr/local/var/postgres
volumes:
postgres-db-production:
and one for develop:
version: "3"
services:
app:
image: "demo:latest"
container_name: demo-develop-api
restart: always
depends_on:
- "developdb"
environment:
- SPRING_DATASOURCE_URL=jdbc:postgresql://developdb:5432/testdb
- SPRING_DATASOURCE_HIKARI_JDBC_URL=jdbc:postgresql://developdb:5432/testdb
- SPRING_DATASOURCE_USER=tester
- SPRING_DATASOURCE_PASSWORD=test
- SPRING_JPA_HIBERNATE_DDL_AUTO=update
ports:
- "8441:8443"
developdb:
image: "postgres:latest"
container_name: developdb
ports:
- "5431:5432"
environment:
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
volumes:
- postgres-db-develop:/usr/local/var/postgres
volumes:
postgres-db-develop:
I build both images using:
docker-compose -p demo-production-api -f docker-compose.yml up -d && docker-compose -p demo-develop-api -f docker-compose-develop.yml up -d
Now I was able to build both environments demo-develop-api and demo-production-api as well, the Spring Boot application from demo-develop-api docker image runs using the command:
docker run -it demo-develop-api
The application runs but I keep getting this error:
Caused by: java.net.UnknownHostException: productiondb
The above error happened after changing the database host in the application.properties file from localhost to productiondb first I was getting the following:
org.postgresql.util.PSQLException: Connection to localhost:5432
refused. Check that the hostname and port are correct and that the
postmaster is accepting TCP/IP connections.
Why this issue occurring or what is the cause?
How to solve this kind of issue?

Answer 1

As far as I see it, the issue might be that you have binded port 5430 and 5431 to 5432 and you might be having the port set to 5432 in your application.resources file. Your application should be trying to connect to the database by using either port 5430 or 5431 for production and development respectively. Please check and try this. So, make a port change in the application.resources file.

Answer 2

So after a long time of debugging and trials, hopefully, this is is going to save people hours, it turned out that actually, the Spring Boot application inside the container was restarting runs and crashes without any errors, which made me more confused why it is not listening or opening a port. I even doubt it that it could be a firewall or something. So basically I just tried to get a shell from the container by doing:
docker exec -it <container id or image> sh
Note: Since I am using the image openjdk:8-jdk-alpine don't do below you will not get a shell:
docker exec -it <container id or image> bash
Then I tried to get a list of open ports by doing:
netstat -tulpn | grep ":8443"
The port 8443 was not listed, I thought it could be a problem with the java program not being running, tried to execute the spring boot which executed but without any errors and the shell itself was exiting which made me more confused.
Until I have found out that container was restartig because of Spring Boot was crashing. So I enabled verbose mode by adding the below properties to application.properties then rebuild the image again:
logging.level.org.springframework.web=DEBUG
logging.level.org.hibernate=DEBUG
So I retried the last above steps where I get a shell and execute the app.jar and it turned out that the database testdb did not exist.
UPDATE: So to sum up here how I modifed my project, I created two Spring Boot Profiles for my case one for develop application-develop.properties and one for production application-production.properties:
So inside the application-develop.properties I have it mapped to a develop postgres container host and port:
spring.datasource.url=jdbc:postgresql://developdb:5432/testdb
spring.datasource.hikari.jdbc-url=jdbc:postgresql://developdb:5432/testdb
spring.datasource.username=tester
spring.jpa.generate-ddl=true
spring.datasource.password=test
spring.jpa.database-platform=postgres
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQL9Dialect
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
server.port=8443
And for application-production.properties:
spring.datasource.url=jdbc:postgresql://productiondb:5432/testdb
spring.datasource.hikari.jdbc-url=jdbc:postgresql://productiondb:5432/testdb
spring.datasource.username=tester
spring.jpa.generate-ddl=true
spring.datasource.password=test
spring.jpa.database-platform=postgres
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQL9Dialect
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
server.port=8443
And in the docker-compose file for develop I just define the Spring Boot profile environment variable to:
environment:
- SPRING_PROFILES_ACTIVE=develop
And for production docker-compose file I define it as below:
environment:
- SPRING_PROFILES_ACTIVE=production