Day 33 Launching Kubernetes Cluster with Deployment!

Yesterday, I was neck-deep in Kubernetes, deciphering its architecture, and today I’m stepping up my game by actually launching a Kubernetes cluster with Deployment. Fancy, right? If you're still catching up, no worries! This task is straightforward, and exciting, and gives your resume that extra sparkle! ??

What is a Deployment in Kubernetes?

Imagine being a manager with a team that magically fixes itself when someone falls sick (auto-healing) and grows instantly when there’s a party to plan (auto-scaling). That’s what a Deployment does for your apps in Kubernetes! It’s like the Swiss Army knife for Pods and ReplicaSets.

In simple terms:

• It ensures your app runs exactly how you want it (desired state).
• It rolls out updates, scales when needed, and even heals itself if something breaks.

Today’s Task: Todo-App Deployment

Should you accept it, the mission is to deploy a sample Todo app using Kubernetes’ auto-healing and auto-scaling features.

Here’s how I did it (spoiler: it wasn’t without drama ):

Step 1: The Deployment YAML File

The magic starts with the deployment.yml file. Here’s a sneak peek at mine:

• Replicas: Set to 3 for redundancy. More replicas = happier users.
• Auto-Healing: Liveness and readiness probes ensure our app recovers faster than I do after coffee.
• Auto-Scaling: Requests and limits make sure Kubernetes scales gracefully when under load.

Step 2: Deploy to Minikube

With the YAML file ready, I applied it to my Kubernetes cluster (running on Minikube):

Success? Well, not quite yet. Here’s where the fun started. ??

Hurdles and How I Jumped Over Them

1. “ImagePullBackOff” Error

• Cause: Forgot to push my Todo app image to Docker Hub.
• Fix: Uploaded it using:

2. Probes Misconfigured ??♀?

• Cause: Misspelled the path in livenessProbe.
• Fix: Checked logs using:

Lesson learned: Typos are evil.

3. Scaling Issues ???♂?

• Cause: Kubernetes didn’t auto-scale when I overloaded the app.
• Fix: Enabled Horizontal Pod Autoscaler (HPA):

Step 3: Verify Deployment

I verified my deployment with these handy commands:

• Check pods running:

kubectl get pods

• Check deployment status:

kubectl get deployment

• Open in Minikube:

minikube service todo-app

Seeing my Todo app up and running felt like winning the lottery (without the money, unfortunately).

Pro Tips for You!

1. Document Everything! ?? I've made detailed documentation on this project, breaking down every step with screenshots and simple explanations.
2. Embrace Errors. Errors are just Kubernetes’ way of saying, “You’re learning!”
3. Build Your Resume! Add this project to your portfolio. The recruiters will love seeing Kubernetes and CI/CD on your resume!

Final Words

Deployments might sound daunting, but trust me, once you see your app scaling and healing on its own, you’ll be hooked!

Want to know more or get help? Check out my detailed documentation or feel free to ask questions in the comments. Let’s make DevOps fun together!

Stay tuned for Day 34—something tells me it’ll be even more exciting!