Using Daphne without altering nginx config on Google App Engine

[Rahul Arora]

Hi all,

I'm trying to switch from gunicorn to Daphne for my Django app on GAE Flex, since I need to use Django Channels. Previously the site worked fine with gunicorn as entrypoint (in the app.yaml file). I just replaced it with daphne so my yamlfile looks like this:

runtime: python
env: flex

runtime_config:
  python_version: 3

entrypoint: daphne -b 0.0.0.0 -p 8001 my_project_name.asgi:application

I've already made a .asgi file next to my .wsgi file and declared an application there.

In requirements.txt I've ensured the daphne(2.4.1) and asgiref(3.2.3) packages are the latest versions.

Finally when I do 'gcloud app deploy', deployment appears to happen smoothly and in the build logs I can see daphne starting:

Step #1: Step 9/9 : CMD exec daphne -b 0.0.0.0 -p 8001 my_project_name.asgi:application
Step #1:  ---> Running in c6f3762a5ce2

But when I go to the site, I'm seeing a 502 Bad Gateway error on the site, with "nginx" in the next line.

Is there a way to deploy Daphne without going into nginx configurations etc? I'm using an app engine only because I wanted to avoid doing micro-level tweaks on a cloud machine.

Thanks,
Rahul.

[Integr@te System]

Hi Rahu,

Check chennel_layers setting as a sample in this doc for more helpful

https://channels.readthedocs.io/en/latest/deploying.html

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[Rahul Arora]

Thanks for your reply. Is there really no way of using daphne without altering nginx/supervisord config like we use gunicorn?

If not, I have some questions based on my efforts so far, please. I will be grateful for your attention to these. Apologies if they're silly questions since I'm a beginner:

1. If I reconfigure nginx and supervisord, how should I make sure the conf files get picked up by GAE? Should I add something to the app.yaml file to point to the nginx-app.conf file in the root folder? Should I also change my runtime declaration to custom, or leave it as python? I find that whenever I add an nginx-app.conf file in the root folder the build times out and I get an Error[4] from gcloud app deploy. Otherwise the build completes fully.

2. If I am starting a Unix socket for Daphne in the supervisord config file, what happens to the entrypoint delaration in the ap.yaml file? Do I delete that?

3. How do I know what path I should use in the command: "daphne -u /run/daphne/daphne%(process_num)d.sock". Also, what is process_num?

4. The new conf files (for nginx and supervisord in the documentation shared by you) refer to localhost:8000 - should I change this? What is the TCP socket used by nginx backend?

5. How can I do things like updating supervisor, "sudo service nginx reload" etc on the GAE PaaS platform since I'm not operating the instance directly? Or is this not necessary since I'm creating a whole new build each time?

Sorry for the barrage and thanks in advance,

Rahul.

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[Integr@te System]

Hi Rahu,

Plz scrutinize  more info to differ, combine and select right one for your case.

https://stackshare.io/stackups/google-app-engine-vs-nginx

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[Sai Santhosh]

Hlelo

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[Rahul Arora]

Thanks but this is not a valid or useful comparison since GAE is a PaaS service whereas Nginx is a proxy server. In fact GAE itself uses Nginx which is why I'm getting the error from Nginx despite not configuring it myself.

Rahul.

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[Integr@te System]

Hi Rahul,

That right you had a few answer on your previous question, more deeper perhap you must config reverse proxy connection (tcp sock (ur question) compatible http)

these are for your custom 

https://www.nginx.com/blog/websocket-nginx/?__cf_chl_captcha_tk__=9fc641baf627a1f387f365526786c1929d6228e9-1579534051-0-AQ6HE6aPclHIoe1eXIG58qJDoS8rfLMq6XCSerTbE7DgckT5DZPBe7z03bg-q68-sV0yhL8widMBgAGw8G4rQVAAQZyXbwnOgoiGXirdV1z92FffD_gr342PfSrXFbl-UsEW0vOYeRkvInYe45iSeqG-Ywsp6oxzoE00XcZnQhdRwhZ_nPuT1yoRfmvEA30TB--CWjLH_PN3-Do3Hkj4YSCDoCDulx3TzIfj3oB-n7oGJR86KqcnViZhcZn1r6gAx94Bx0UHzrNV7QStAtWkPex1J5Gp3capZUdwA4qdRPVHQGiiHSaniVjT_PRRiIq6bKVWiEy1nMYt0A0RIs4Aej2LTNy-GrcBsHKXeMuYpE2Z-gocONTNQITbekY5vkK7I10HVaPR-eovREjv8zq-xlg

https://cloud.google.com/appengine/docs/flexible/python/using-websockets-and-session-affinity

From flex env gcp provided:

https://cloud.google.com/appengine/docs/flexible/

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