Error when running docker container Django app

Question

Hi,

I am trying to publish a docker container on Azure, It's a Django app however I keep receiving the below errors:

Container shawjournal_0_6deb178e couldn't be started: Logs = 2022-12-10T10:32:28.141764570Z exec /usr/local/bin/python3: exec format error

The below is from the log stream:

• 2022-12-12T18:50:33.663782050Z exec /usr/local/bin/python3: exec format error
  2022-12-12T18:50:52.266Z ERROR - Container shawjournal_0_b21a049f for site shawjournal has exited, failing site start
  2022-12-12T18:50:52.281Z ERROR - Container shawjournal_0_b21a049f didn't respond to HTTP pings on port: 80, failing site start. See container logs for debugging.

I looked at the following and decided to contact support as the many attempts I made haven’t worked -

• https://social.msdn.microsoft.com/Forums/en-US/4e399f26-ac3f-4d5f-8aeb-b0ef85606153/exec-format-error-when-running-docker-instance-in-azure?forum=AzureContainerServices

Please also see my stack overflow question for more details and error screenshots - https://stackoverflow.com/questions/74734390/azure-application-error-when-trying-to-run-django-web-app.

I am using an M1 Mac and from what I’ve seen the issue could be with the system architecture but I want to refrain acting upon that until I am sure, as changing this on Docker might cause further issues. I have included DOCKER_REGISTRY_SERVER_PASSWORD …URL and …USERNAME in which I used my DOCKER login credentials, which hasn’t solved this issue.

Dockerfile contains:
...

EXPOSE 80  
EXPOSE 8080  
EXPOSE 8081  

..

Appreciate any help,

Many thanks

Answer 1

LucasShaw-6211, Following-up on this, I understand you have referred to multiple threads/solutions on this. If you haven't reviewed these already, please try these:

From the initial investigation, I see that you’re exposing multiple different ports.
By default, App Service assumes your custom container is listening on port 80. If your container listens to a different port set it using this App Setting.
E.g., 8000. || I see you have added port 9000 and 8000 in a few settings.

Just to highlight the difference: app settings/variable- PORT (default) vs WEBSITES_PORT (it’s for custom containers).

This doc shows supported and unsupported Docker Compose configuration options ( build (not allowed))

Checkout the App Service Django samples here and steps outlined in this doc Django Deployment on App Service Linux for more info.

Answer 2

most likely you used an arm64 image instead of amd64 image. normally on a Mac m1 you would use arm64 images as they run native. but via rosetta you can run amd64 images also.

you can also build multi-arch containers.

https://learn.microsoft.com/en-us/azure/container-registry/push-multi-architecture-images