I'm really struggling with a frustrating issue related to Docker. I have a basic docker-compose setup with a bot service that depends on a PostgreSQL database. Everything works fine until I try to expose the PostgreSQL port to the host machine. When I include the port mapping in my docker-compose file and run `docker compose up`, I get an error saying the port is already allocated. I've tried different ports, restarted services, and killed containers, but nothing seems to resolve the issue. What am I missing here? Any tips would be greatly appreciated!
3 Answers
Have you tried using `sudo netstat -tulpn`? It can help you see which processes are using your ports. It's odd if changing ports doesn't work; usually, if you have postgresql installed, that could be blocking port 5432. If that's the case, you might want to try mapping a different host port like 5433 to the container's 5432.
I don't know why you're getting that error, but `netstat` can help identify the issue. By the way, do you really need to expose that PostgreSQL port? It's common to keep it internal since usually only your bot would access it.
I want to connect using DBeaver. Is that not the right way to access the database?
If all else fails, just delete all your containers and restart the Docker daemon. This kind of issue can happen from time to time, and that's usually the quickest fix.
Yeah, I've checked and tried over a dozen ports. I'm sure those ports were free, it's just so strange!