I'm currently working with Docker to run PostgreSQL and pgAdmin4 as part of my learning process. My issue is with my Spring Boot application; it just can't seem to connect to the PostgreSQL database inside my Docker container. I've set up an internal Docker network for both pgAdmin4 and PostgreSQL so they can communicate. I'm able to access and manipulate the database through pgAdmin without any issues. However, my Spring Boot application is located outside of Docker and can't find the database. I've checked my application.yml configuration numerous times, and everything looks fine on that end. Even after deleting and recreating the containers and volumes, the problem persists. Any advice would be greatly appreciated!
3 Answers
It sounds like you're having a classic container networking issue! When your Spring Boot app runs outside of Docker, 'localhost' refers to your host machine, not the container. You should try using the container's name, like 'librarydb', as the hostname in your application.yml instead. Docker networks allow you to use the container names as DNS, so that should help your app find the database.
Also, it's worth checking the logs for your PostgreSQL container. Sometimes there are clues there about why connections are failing, even if there are no issues with credentials. You might find an error there that could lead you to a solution.
I noticed you mentioned deleting and recreating containers and volumes. Just a heads up — sometimes the issue can be related to firewall settings or network configurations. Make sure you’ve exposed the correct ports in your Docker setup and that your Spring Boot app is pointing to the right IP and port combination. Port forwarding can be a bit tricky.
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