In this guide, we will deploy a simple test application. This will help verify that your Kubernetes cluster is running correctly and ready for deployments. The application is an Nginx web server that serves a single static page. While simple, this example shows the idea.

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Step 1: Check That Your Cluster is Ready

Run: 
kubectl get nodes
You should see a list of nodes like this (node names may vary). 
NAME                       STATUS   ROLES           AGE     VERSION
nks-default-ctl-1d39beb8   Ready    control-plane   9m39s   v1.32.3
nks-default-wrk-5a451893   Ready    <none>          8m35s   v1.32.3
If so, move to the next step.

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Step 2: Deploy the Application

Create a file named web-app.yaml with the following content, or download it here. Time to deploy. Run: 
kubectl apply -f web-app.yaml
You should see: 
deployment.apps/web-app created
service/web-app created

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Step 3: Check That the Application is Running

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Check if the deployment is ready

Run: 
kubectl get deployment web-app
You should see output similar to this: 
NAME      READY   UP-TO-DATE   AVAILABLE   AGE
web-app   1/1     1            1           27s

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Check if the service is running

Run: 
kubectl get service web-app
You should see details of the service.

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Check if the app is available from the Internet

To get the URL for your application, run: 
kubectl get service web-app -o go-template --template=\
'{{range .status.loadBalancer.ingress}}'\
'{{range $key, $val := . }}'\
'{{if eq $key "ip" "hostname"}}http://{{$val}}{{"\n"}}{{end}}'\
'{{end}}'\
'{{end}}'
You should see one or more HTTP (http://…) links. Open the link in a browser. You should see a web page displaying:
welcome to my web app!
Note: It can take several minutes for the application to become available. If you see the webpage, that means everything is working correctly and the application has been deployed successfully.

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Clean up

To remove the deployed resources, run: 
kubectl delete -f web-app.yaml
You should see: 
deployment.apps "web-app" deleted
service "web-app" deleted
Note: This may take a few minutes.

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Next Steps

This is just a demo. For a production-ready deployment, you should use HTTPS. One way to achieve this is by using an Ingress controller with Cert-Manager. You can follow these guides to install them: