Kubernetes Basics for Beginners

What is Kubernetes?

Kubernetes (K8s) is an open-source system for automating the deployment, scaling, and management of containerized applications. When you have many Docker containers, Kubernetes orchestrates them.

Why Kubernetes?

• Auto-scaling — add containers under load.
• Self-healing — restarts failed containers.
• Load balancing — distributes traffic.
• Zero-downtime deploys — rolling updates.

Key Concepts

Term	Meaning
Pod	Smallest unit (1+ containers)
Node	A worker machine
Deployment	Manages pod replicas
Service	Network access to pods
Cluster	All nodes together

A Simple Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  template:
    spec:
      containers:
        - name: app
          image: my-app:1.0

Basic kubectl Commands

kubectl get pods
kubectl apply -f deploy.yaml
kubectl scale deployment my-app --replicas=5

FAQs

Do I always need Kubernetes?

No — it's for complex, large-scale apps. Small apps don't need its complexity. More in our DevOps section.

Docker or Kubernetes first?

Learn Docker first — Kubernetes manages Docker containers.