[Question] Unable to get Quart working with Docker about quart

[mathana96]

Hi there,

I managed to get it working by binding to 0.0.0.0 using the host parameter. My app.py is as follows:

from quart import Quart

app = Quart(__name__)

@app.route('/')
async def hello():
    return 'hello world!!'

app.run(host='0.0.0.0')

Silly of me. Thank you for your time!

[pgjones]

Hmm, it looks good (I don't really know about docker-compose though). Can you get the logs from the container? It should print that it is serving or print an error.

[mathana96]

Thanks for getting back to me.

The logs for the container are empty. It seems to get stuck at the attaching stage.

docker-compose has a --verbose option, which I tried. The messages displayed seem nearly identical to when I ran the same for a Flask container with identical setup, except for minimal changes in the requirements.txt and app.py files.

This is for the Flask container (trimmed):

Creating api-play_app_1 ... done
compose.parallel.feed_queue: Pending: set()
compose.parallel.parallel_execute_iter: Finished processing: <Service: app>
compose.parallel.feed_queue: Pending: set()
Attaching to api-play_app_1
compose.cli.verbose_proxy.proxy_callable: docker events <- (filters={'label': ['com.docker.compose.project=api-play', 'com.docker.compose.oneoff=False']}, decode=True)
urllib3.connectionpool._make_request: http://localhost:None "GET /v1.25/events?filters=%7B%22label%22%3A+%5B%22com.docker.compose.project%3Dapi-play%22%2C+%22com.docker.compose.oneoff%3DFalse%22%5D%7D HTTP/1.1" 200 None
compose.cli.verbose_proxy.proxy_callable: docker events -> <docker.types.daemon.CancellableStream object at 0x104476da0>
app_1  |  * Serving Flask app "app" (lazy loading)
app_1  |  * Environment: production
app_1  |    WARNING: Do not use the development server in a production environment.
app_1  |    Use a production WSGI server instead.
app_1  |  * Debug mode: on
app_1  |  * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
app_1  |  * Restarting with stat
app_1  |  * Debugger is active!
app_1  |  * Debugger PIN: 174-318-941

And this is for the Quart container (trimmed):

Creating api-test_api_1 ... done
compose.parallel.feed_queue: Pending: set()
compose.parallel.parallel_execute_iter: Finished processing: <Service: api>
compose.parallel.feed_queue: Pending: set()
Attaching to api-test_api_1
compose.cli.verbose_proxy.proxy_callable: docker events <- (filters={'label': ['com.docker.compose.project=api-test', 'com.docker.compose.oneoff=False']}, decode=True)
urllib3.connectionpool._make_request: http://localhost:None "GET /v1.25/events?filters=%7B%22label%22%3A+%5B%22com.docker.compose.project%3Dapi-test%22%2C+%22com.docker.compose.oneoff%3DFalse%22%5D%7D HTTP/1.1" 200 None
compose.cli.verbose_proxy.proxy_callable: docker events -> <docker.types.daemon.CancellableStream object at 0x101ed2f28>

The final few lines seem to be missing.