Kubernetes with Docker unable to change from default port of 80

use "targetPort" to indicate what port your pod is listening on. Your yaml spec should be something like:

---apiVersion: v1kind: Servicemetadata:  name: myAppspec:  selector:    app: myApp  ports:  - name: http    port: 8080    targetPort: 8080    nodePort: 30001

After much trial and error I found the solution.

In line with what @johnharris85 and @Yuankun said about the IP Address needing to be set to 'any' rather than on the localhost, I found this article: http://blog.scottlogic.com/2016/09/05/hosting-netcore-on-linux-with-docker.html

The dotnet core app defaults to using the localhost network, and while running locally on a test machine, this works fine. However, running a dotnet app inside a Docker container means that the localhost network is restricted to within the container.

To solve this, I initially changed

options.Listen(IPAddress.Loopback, 8080);

to

options.Listen(IPAddress.Any, 8080);

However, I tested this locally and could not get the app to respond. I took this to mean that this was not a valid solution. This may have been a valid solution if I had tested it with a containerized app.

I then came across the aforementioned article and decided to try the following:

public static IWebHost BuildWebHost(string[] args) =>    WebHost.CreateDefaultBuilder(args)    .UseStartup<Startup>()    .UseUrls("http://*:8080")    .Build();

This solved my problem and now my app is accessible through the Kubernetes endpoint.

Thanks to everyone who gave advice.