Hello,

I think you are looking for this tutorial?

https://docs.railway.com/tutorials/deploying-a-monorepo

Thanks, brody, I appreciate that help with structuring my Railway to match my monorepo directory structure. I created two services, a frontend (react) and a backend (python). The build is succeeding for both services.

Now I get a runtime error with the backend service because Railway is looking for the python component reactpy. I do have them listed in my ./requirements.txt (it's in the root folder, not in the backend/ folder, though). Any ideas?

File "/app/main.py", line 1, in <module>

from reactpy import component, html

ModuleNotFoundError: No module named 'reactpy'

I'm getting the hang of this. I moved my requirements.txt into the backend folder, and added reactpy. Then it failed with another library missing, fastapi, so added that as well. Now, when I start my backend service by clicking on the url, I got this:

Application failed to respond

This error appears to be caused by the application.

If this is your project, check out your deploy logs to see what went wrong. Refer to our docs on Fixing Common Errors for help, or reach out over our Help Station.

If you are a visitor, please contact the application owner or try again later.

Request ID:
YS0ON8ZXRbe4el95Psnj8Q_3987874068

Looking at the http logs, I see 502 errors which indicates a port error. Hmmm.... ok I'll go look at the help files.

You would want to be starting your fastapi server with uvicorn -

https://docs.railway.com/reference/errors/no-start-command-could-be-found#fastapi

And similarly, you would want to be running your frontend with a production grade web server too, for that I recommend caddy -

https://github.com/brody192/create-react-app-starter

Just copy the nixpacks.toml and Caddyfile from this repo into your frontend folder.

Hi Brody, I have made my project public: https://railway.com/project/cb4e200f-3c07-423e-aa77-22de9bb106dd

(1) For the frontend/ I copied the nixpacks.toml and Caddyfile into the frontend/ directory
I run the application by going to the URL in settings: http://frontend-production-1cb0.up.railway.app/
Still get the "Application failed to respond error", as above

(2) My backend application is written in python, so shouldn't my start command just be: "python app.py"?
Note: the backend app uses Flask, but changing my start command to "gunicorn app.py:app" didn't work either
Still get the "Application failed to respond error", as above

Here are the logs:

frontend Deploy log:
Starting Container

using config from file

adapted config to JSON

Caddyfile input is not formatted; run 'caddy fmt --overwrite' to fix inconsistencies

admin endpoint disabled

automatic HTTPS is completely disabled for server

started background certificate maintenance

server running

serving initial configuration

cleaning storage unit

finished cleaning storage units

backend deploy log:
Starting Container

* Serving Flask app 'app'

* Debug mode: on

2025-02-09 01:31:17,680 INFO: WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.

* Running on http://127.0.0.1:5000

You would need to be running your flask app with gunicorn.

Thank you for your continued help, Brody. After adding gunicorn to my requirements.txt file, I rebuild and deployed successfully. However, when I call the app, I still get the same error. Here is the deploy log:

Starting Container

Starting gunicorn 23.0.0

[INFO] Listening at: http://0.0.0.0:8080 (1)

[INFO] Using worker: sync

[INFO] Booting worker with pid: 4

Please see our docs on the topic -

https://docs.railway.com/reference/errors/application-failed-to-respond

Amazing help, Brody, on a Saturday night. Raleway is lucky to have you!

I used the Settings for each service and used the port detected by Raleway. It worked, yay, I am so happy!

Glad I could help!