I recently publish a post about “How to configure docker on Windows”. But after some windows update, localhost processing stopped working.
Example
Let us look at the example with the same dockerfile.
FROM microsoft/dotnet:latest COPY . /app WORKDIR /app RUN ["dotnet", "build"] EXPOSE 5000/tcp ENV ASPNETCORE_URLS http://*:5000 ENV ASPNETCORE_ENVIRONMENT development ENTRYPOINT ["dotnet", "run"]
After building the image and turning it on. We are getting information that our application is working on port :5000
But if we try to run it on http://localhost:5000/ , our website is not responding.
Let’s look at what docker ip works on. To do this we need to enter the docker inspect command plus name of our image. In our case:
docker inspect -f "{{ .NetworkSettings.Networks.nat.IPAddress }}" 24271
On this ip our application works!
So what happend?
This is described in detail HERE.
But in brief:
Container endpoints are only reachable from the Windows host using the container’s IP and port.
We must admit that the natural environment for a docker is linux. That’s why many windows updates can make us bloody in future, so in my opinion the best environment for hosting applications is linux (especially the core version allows us to do so).
