I'm running into a deployment issue with my project that uses multiple Docker containers. When I try to deploy everything using `docker compose`, the backend services and database start up fine, but the frontend can't connect to the server unless I use a reverse proxy like Nginx Proxy Manager. While this workaround technically solves the problem, it complicates things unnecessarily.
My goal is to ensure that beginners can simply run `docker compose up -d` and have the entire stack work seamlessly without extra configuration. It feels like I'm missing something regarding the networking setup between the containers. Ideally, the frontend should be able to communicate directly with the backend using service names in the Docker network, but that's not happening cleanly for me. I've checked out other open-source projects like Supabase, Gitea, Portainer, and Excalidraw, and they don't seem to have this issue—everything works fine for them. Has anyone faced a similar problem or have any tips on how to configure the `docker-compose.yml` so that the frontend and backend can communicate directly without needing a proxy manager?
2 Answers
It sounds like you're running into a CORS issue, which is pretty common with cross-domain communication! One way to deal with this is by either hosting your frontend as a subpath of your backend or continuing to use a proxy. For instance, in your dev environment, you could set everything up in one container, including a proxy. For production, consider compiling your frontend and hosting it on the same server as your backend. That might help simplify things a lot!
What endpoint are you configuring your frontend to use? If you're using a setup like this:
```
services:
frontend:
image: node:20
command: npm start
ports:
- "3000:3000"
depends_on:
- backend
backend:
image: python:3.11
command: python app.py
ports:
- "5000:5000"
```
Make sure your frontend connects using `http://backend:5000` instead of localhost, especially across different devices in the same network.
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