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Deploy-Your-First-App.md

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Deploy a simple web application

This example will guide you trough the steps to deploy one webb application in one pod on a Docker Desktop K8:s kluster. As the Docker Desktop K8:s environment only consist of one kluster already prepared for you, the creation of a K8:s kluster is omitted.

Deployment

Get the nodes of our K8:s kluster, just to know that your kubernetes kluster is up and running.

kubectl get nodes

Should return something like this on a fresh install.

NAME             STATUS   ROLES           AGE   VERSION
docker-desktop   Ready    control-plane   22h   v1.25.2

Create a deployment

kubectl create deployment kubernetes-bootcamp --image=bkimminich/juice-shop:latest

View your result

kubectl get deployments

NAME                  READY   UP-TO-DATE   AVAILABLE   AGE
kubernetes-bootcamp   0/1     1            0           7s

Create a service

You now have a pod running, you can check that out with

kubectl get pods

NAME                                   READY   STATUS    RESTARTS   AGE
kubernetes-bootcamp-6b7cccd9c4-ftljv   1/1     Running   0          3m38s

To expose your app you need a K8:s to ge a IP address reachable outside the K8:s kluster. We create a new service like this:

kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port 3000

Check out your new service.

kubectl get services

NAME                  TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
kubernetes            ClusterIP   10.96.0.1       <none>        443/TCP          22h
kubernetes-bootcamp   NodePort    10.103.59.168   <none>        3000:31123/TCP   111s

Open this URL in your browser: http://localhost:30460 If it´s not working, check the port number after 3000: it may not be the same as this example.

You shoud now see the famous OWASP Juice shop!

Alt text

Congratulations you have now deployed your first K8:s application and made it reachable outside your K8:s kluster.

Tips if you want to create files (called manifest) you can add --output="yaml" like this:

kubectl create deployment kubernetes-bootcamp --image=bkimminich/juice-shop:latest --output="yaml"

This manifest file could be saved and use to recreate your application on a different kluster. With this command:

kubectl apply -f bootcamp-deployment.yaml

And for the service.

kubectl apply -f bootcamp-service.yaml

One more tip, later on when you could try to run this files automatically with the Power Kubernetes Client open the solution in VS, set the console project as startup, then run this command.

publish bootcamp

This will apply the files like the first tip, and it will also open the browser with this url: http://localhost:31123 That step is fired because of the extra PowerCommands specific file has been added to the other manifest files, but it has nothing to do with kubernetes. As the tutorials will get more and more advanced I am sure that you does not want to do every single step manually.