Containerization-and-DevOps

Hands-on Task: Run and Manage a “Hello Web App” (httpd)

Objective

Deploy and manage a simple Apache-based web server and:

• verify it is running
• modify it
• scale it
• debug it

Submit it on GitHub Repo under Theory or Class folder and share its URL

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Task: Deploy a Simple Web Application (Apache httpd)

You will run an Apache server instead of nginx.

Step 1: Run a Pod

kubectl run apache-pod --image=httpd

Check:

kubectl get pods

Step 2: Inspect Pod

kubectl describe pod apache-pod

Focus:

• container image = httpd
• ports (default 80)
• events

Step 3: Access the App

kubectl port-forward pod/apache-pod 8081:80

Open:

http://localhost:8081

You should see: → Apache default page (“It works!”)

Step 4: Delete Pod

kubectl delete pod apache-pod

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Insight

Same as before:

• Pod disappears permanently
• No self-healing

Task: Convert to Deployment

Step 5: Create Deployment

kubectl create deployment apache --image=httpd

Check:

kubectl get deployments
kubectl get pods

Step 6: Expose Deployment

kubectl expose deployment apache --port=80 --type=NodePort

Access again:

kubectl port-forward service/apache 8082:80

Open:

http://localhost:8082

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Task: Modify Behavior

Step 7: Scale Deployment

kubectl scale deployment apache --replicas=2

Check:

kubectl get pods

Observe

• Multiple pods running same app

Step 8: Test Load Distribution (Basic)

Run port-forward again and refresh browser multiple times.

(Advanced later: logs + different content per pod)

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Task: Debugging Scenario

Step 9: Break the App

kubectl set image deployment/apache httpd=wrongimage

Check:

kubectl get pods

Step 10: Diagnose

kubectl describe pod <pod-name>

Look for:

• ImagePullBackOff
• error messages

Step 11: Fix It

kubectl set image deployment/apache httpd=httpd

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Task: Explore Inside Container (Important Skill)

Step 12: Exec into Pod

kubectl exec -it <pod-name> -- /bin/bash

Now inside container:

ls /usr/local/apache2/htdocs

This is where web files are stored.

Exit:

exit

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Task: Observe Self-Healing

Step 13: Delete One Pod

kubectl delete pod <one-pod-name>

Watch:

kubectl get pods -w

Insight

• Deployment recreates pod automatically

Task: Cleanup

kubectl delete deployment apache
kubectl delete service apache

What You Learned (Important)

This task is better than nginx because:

• You accessed actual web output
• You explored container filesystem
• You practiced debugging real errors
• You saw scaling + recovery

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