Unable to deploy Windows container on Azure Web App for container from DockerHub

Question

I am checking the documentation here about deploying Windows container (in preview) in Azure Web App for containers.

Also it appears that the document is lagging behind (as appears to be evolving fast and this is in preview). E.g. In the steps 5 of the Windows container deployment the instructions does not talk about the startup file as shown below. No documentation if this is even mandatory or can be kept empty?

I am seeing error on this pannel at the bottom while trying to deploy the container from image hosted in public repo of Docker Hub.

How to fix the error I am getting?

The error message is: Cannot run this Operating System/Version in Windows Containers. Maximum supported OS version is 10.0.14393.9999.

Here is my docker.yml which I added from VS 2017 by adding "container orchestration support".

FROM microsoft/aspnet:4.7.2-windowsservercore-1803
ARG source
WORKDIR /inetpub/wwwroot
COPY ${source:-obj/Docker/publish} .

And here is the docker-compose.yml

version: '3.4'

services:
  webformapp:
    image: ${DOCKER_REGISTRY-}webformapp
    build:
      context: .\WebFormApp
      dockerfile: Dockerfile

Joaquín Vano · Accepted Answer · 2019-03-08 03:24:52Z

1

Currently we only support Windows Server 2016 RS1 images but we are rolling out an update in which we will be able to run all Windows container base images from RS1 to RS5. I don't have an exact date but we should be done by the end of the March.

For now, please change your base image to: microsoft/aspnet:4.7.2-windowsservercore-ltsc2016

Once we finish the update, please try: microsoft/aspnet:4.7.2-windowsservercore-ltsc2019

ltsc2019 is smaller,so you will notice that the web app will be starting quicker

For more info: https://hub.docker.com/_/microsoft-dotnet-framework-aspnet

Thanks,

Joaquín

answered Mar 8, 2019 at 3:24

Joaquín Vano

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4c74356b41 · Accepted Answer · 2019-02-27 16:05:27Z

0

You are using 1803 as a base OS version for the container, however the error mentions 10.0.14393.9999, which corresponds to 1607 (https://en.wikipedia.org/wiki/Windows_10_version_history). So you need to use another base image. Try this base: 4.7.2-windowsservercore-ltsc2016

answered Feb 27, 2019 at 16:05

4c74356b41

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Phil S · Accepted Answer · 2019-02-27 16:15:25Z

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Disclaimer: Answer is not specific to Azure Web App, so treat with caution.

However, I've had a fair few dealings with the problems around hosting windows containers. It looks very similar to an issue I've had before - basically, the virtualisation layer between Docker and Windows is very thin, so the windows version between the host and container need to be aligned.

You either need to match up the Container version with the Windows version (i.e. build from a different base image), or use hyper-v virtualisation mode within docker run to handle the difference. Not sure if the second is even possible within Azure Web Apps.

See here for more details:

Microsoft Documentation

edited Feb 27, 2019 at 16:15

answered Feb 27, 2019 at 16:08

Phil S

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5 Comments

4c74356b41 Over a year ago

second is not possible

Phil S Over a year ago

Good to confirm

Anand Moghe Over a year ago

BTW, I am deploying on a PaaS "Web App for Container" and the version of image is selected by VS 2017...so shouldn't it just work (even in preview) ? I have decided to stay away from Windows container now until its in GA mode as I can not afford to spend reading between the line - especially when I am using PaaS solutions.

Phil S Over a year ago

Agree in principle Andy...if only :). I would say generally that Windows containers seem to be the 'poor relation' to Linux - there seems to be lots of unsupported features, hidden issues etc

Andrew Westgarth Over a year ago

We agree and as Joaquin mentions in his answer we are working on improving the capability. For now as called out in our documentation (learn.microsoft.com/azure/app-service/…) you need to specify either the multi-arch image from the asp.net team or specify an ltsc2016 image. Visual Studio defaults to whatever your local machine is capable of running. Thanks for the feedback, it is noted.

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