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Triggering the Docker Hub autobuild

With the autobuild setup created in the previous section, triggering a new Docker image build is as simple as committing new code to your GitHub repository. In order to do that, you have to do the following:

Introduce a change to the source code for the image on GitHub; for example, modify the index.html file:

<!DOCTYPE html>
<html>
    <head>
        <title>Hello World!</title>
    </head>
    <body>
        <h1>Hello World from nginx container! This is a new version of image for autobuild.</h1>
    </body>
</html>

Commit and push the code change:

git commit -am "Updated index.html"
git push -u origin master

In the Builds tab for this image repository on Docker Hub, you should almost immediately see that a new image build has been triggered (source commit: https://github.com/hands-on-kubernetes-on-windows/nginx-demo-index/tree/5ee600041912cdba3c82da5331542f48701f0f28):

If your build fails, you can always inspect the Docker build logs in the build details and Build logs tab.

After the build succeeds, verify your image by running a new container on your Windows machine:

docker run -it --rm `
           -p 8080:80 `
           packtpubkubernetesonwindows/nginx-demo-index:latest

The image will be automatically pulled from the Docker Hub repository. Navigate to http://localhost:8080 in your web browser. You should see the following output:

Congratulations – you have successfully created and triggered a Docker image autobuild on Docker Hub! In the next section, you will learn how to create a similar setup for Windows-based images using Azure Container Registry.