Day 4: Deployments & ReplicaSets — How Kubernetes Runs and Manages Your App

Let’s Begin With What You Might Know

So far, we’ve talked about:

• How Kubernetes runs containers inside Pods

• How those Pods live on Nodes inside a Cluster

• And how the Control Plane decides what happens where

Now imagine this:

You’ve built a great app.
You package it into a container, wrap it in a Pod, and launch it with kubectl run.

Awesome — it's up and running! But soon, you’ll face real-world challenges like:

• “How do I run 3 copies of this Pod?”

• “What if I want to update my app version without downtime?”

• “If a Pod crashes, who will restart it?”

• “How do I tell Kubernetes to keep watching and fix things?”

That’s where Deployments and ReplicaSets come in...

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