Railway•2y ago

Issue with Flask Deployment

Hello, here is my project id: e8d46baa-5de4-495e-bc2e-a8a2b37ed2b0. I am trying to deploy my flask/redis application to railway so that one server is running where 1 port is running the flask api part and another part which is running the redis part. I believe I got the redis part on railway to work, as I can see all my data, but for some reason the flask deployment isnt working as expected. In my main.py, I have this code:

if __name__ == '__main__':
    load_data_to_redis()
    app.run(host='0.0.0.0', port=int(os.getenv("RAILWAY_PORT", 5000)), debug=True)

if __name__ == '__main__':
    load_data_to_redis()
    app.run(host='0.0.0.0', port=int(os.getenv("RAILWAY_PORT", 5000)), debug=True)

However, when I run the deployment, I see this in the deploy logs:

* Serving Flask app 'main'
* Debug mode: on
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on all addresses (0.0.0.0)
* Running on http://127.0.0.1:5000
* Running on http://172.17.0.225:5000
Press CTRL+C to quit
* Restarting with stat
* Debugger is active!
* Debugger PIN: 122-734-501

* Serving Flask app 'main'
* Debug mode: on
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on all addresses (0.0.0.0)
* Running on http://127.0.0.1:5000
* Running on http://172.17.0.225:5000
Press CTRL+C to quit
* Restarting with stat
* Debugger is active!
* Debugger PIN: 122-734-501

For some reason, it's running locally instead of the railway url and it gives this notification/popup above the logs saying "Looks like your app is listening on 127.0.0.1. You may need to listen on 0.0.0.0 instead." even though I am listening on 0.0.0.0. I can provide more of what's in my main.py if needed. I'm not sure what I am doing wrong so would really appreciate it if someone could take a look. Much appreciated!

25 Replies

Percy•2y ago

Project ID: e8d46baa-5de4-495e-bc2e-a8a2b37ed2b0

Adam•2y ago

It’s only possible to expose one port per service on Railway You should put your redis in a different service And judging by your logs, it does seem like something is running on 127.0.0.1. Once you split the services out it’ll be easier to debug

Brody•2y ago

you should also be using gunicorn

This is a development server. Do not use it

krypton201OP•2y ago

So there's no way to run redis as a subprocess under the main flask process on a separate port? I have a function that starts the redis server:

def start_redis_server():
    print("test")
    redis_process = subprocess.Popen(['redis-server'])

def start_redis_server():
    print("test")
    redis_process = subprocess.Popen(['redis-server'])

and I call that function in

if __name__ == '__main__

if __name__ == '__main__

` but it doesn't seem to be even running anything in if name = main. When I deploy to railway, I get this error:

FileNotFoundError: [Errno 2] No such file or directory: 'redis-server'

FileNotFoundError: [Errno 2] No such file or directory: 'redis-server'

Brody•2y ago

you will want to use the redis plugin railway provides

MantisInABox•2y ago

The port for your flask server should also be os.getenv(“PORT”) not RAILWAY_PORT

krypton201OP•2y ago

Thanks that fixed it. Last question: is there anyway to change the value of REDIS_PASSWORD? I hard coded the value in my main.py file instead of using .env variables and accidently pushed to github (its in a private repo so its fine for now).

Brody•2y ago

you can regenerate your redis password in the redis plugin's settings

MantisInABox•2y ago

Really?

Brody•2y ago

yes!

MantisInABox•2y ago

I don’t use redis, so I had no idea I don’t like redis

Brody•2y ago

you can do it in any database railway provides

MantisInABox•2y ago

Never looked into the settings honestly. I just create, use, and tear down when I’m done. But good to know

krypton201OP•2y ago

ah got it, I was looking in the connect section instead of settings. thanks

Brody•2y ago

please make sure you are using variable references not a .env file

krypton201OP•2y ago

like add the variables directly on the railway dashboard?

Brody•2y ago

via variable references https://docs.railway.app/develop/variables#reference-variables

krypton201OP•2y ago

ah ok what's wrong with using a .env file?

Brody•2y ago

storing credentials for a public facing database in plaintext is not a good idea in my opinion keep all secrets in the railway service, and then use the railway cli with railway run <the command you normally use to start your app> this way your app has access to the railway service variables without you ever having to copy your secrets to a .env file

krypton201OP•2y ago

got it wow that was much easier than i expected, thx @Brody

Brody•2y ago

sanity check: show me a screenshot of your service variables?

krypton201OP•2y ago

Brody•2y ago

looks good to me and now you dont have to put secrets in plaintext! pretty neat right?

krypton201OP•2y ago

I have another question. I am trying to use the RediSearch module (https://redis.io/docs/stack/search/) to perform a query against the redis storage. However, when I run my code, I get this error:

redis.exceptions.ResponseError: unknown command `FT.SEARCH`, with args beginning with: `courses_index`, `operating systems`, `VERBATIM`, `LIMIT`, `0`, `10`,

redis.exceptions.ResponseError: unknown command `FT.SEARCH`, with args beginning with: `courses_index`, `operating systems`, `VERBATIM`, `LIMIT`, `0`, `10`,

in the railway api console which seems to occur when the redisearch library is not properly installed. I have RediSearch in my requirements.txt file, so any help would be appreciated.

Redis

RediSearch

Queries, secondary indexing, and full-text search for Redis

Brody•2y ago

the redis database doesn't have the redisearch module installed, this has nothing to do with whats in your requirements.txt. you cant install modules yourself so if you need rediseach you will have to use a different database host

Gaming

Programming

Issue with Flask Deployment