I've created a web api that I can run locally in Visual Studio on localhost and I can access Swagger via. http://localhost:5000/swagger/index.html.
I've created a Dockerfile and executed docker build -t test . and I can see the image created in Docker Desktop. When running it, I don't get any error and I get these logs:
=info: Microsoft.Hosting.Lifetime[14]
Now listening on: http://[::]:80
info: Microsoft.Hosting.Lifetime[0]
Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
Content root path: /app
What do I need to do to make the web api accessible via. a browser?
Microsoft set the environment variable ASPNETCORE_URLS to http://+:80 in their base images, so your app is listening on port 80 when it runs in a container.
Update 2025-01-19: As of .NET 8, MS set ASPNETCORE_HTTP_PORTS to 8080 making the container listen on port 8080 by default.
You should also be aware that Swagger normally isn't available in a container, because Swagger by default only is available when running in development environments. A container is not considered development by default.
So to run your container and have access to Swagger, you should run your container using a command that looks something like
docker run --rm -d -e ASPNETCORE_ENVIRONMENT=Development -p 5000:80 test
You should then be able to access your webapi on http://localhost:5000/ and have Swagger available.