Running public & private images on azure web service authentication issue

Question

When running a mixture of private container registry images from the azure container registry and also a public image from docker.io "docker:latest" but am getting an authentication issue on the docker.io

Docker compose file

    image: docker:latest

the issue is I only have the option to log in to one of them on the azure portal, is there a way to login into both? or am I meant to create a new docker file in the development project which will pull and store the image on my azure container registry?

error log:

2019-11-21 14:07:32.273 INFO - Pulling image: docker:latest

2019-11-21 14:07:32.959 ERROR - DockerApiException: Docker API responded with status code=InternalServerError, response={"message":"Gethttps://registry-1.docker.io/v2/library/docker/manifests/latest : unauthorized: incorrect username or password"}

2019-11-21 14:07:32.959 ERROR - Pulling docker image docker:latest failed:

2019-11-21 14:07:32.959 INFO - Pulling image from Docker hub: library/docker:latest

2019-11-21 14:07:34.061 INFO - latest Pulling from library/docker

2019-11-21 14:07:34.431 INFO - Digest: sha256:813da205ebebb2973c7a8ecac81c49e0510e0de22bff954a0455b582a572eda2

2019-11-21 14:07:34.431 INFO - Status: Image is up to date for docker:latest

2019-11-21 14:07:34.437 INFO - Pull Image successful, Time taken: 0 Minutes and 1 Seconds

2019-11-21 14:07:34.464 INFO - Starting container for site

Answer 1

Unfortunately, the multiple containers on Azure Web App only support one registry currently. It means all the images must belong to one registry, no matter the ACR or Docker hub. The document I found here :

All of the images in your multi-container deployment must use the same Docker registry. In other words, you can't use Azure Container Registry (ACR) for one image and Docker Hub for another registry. Also, if you are using ACR, all images must be on the same ACR server.

So, I recommend you could push all the images which would be used to the ACR then only use it.