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Docker Tutorial — Part 10: Why Kubernetes Exists

Docker solves application packaging. But Docker alone cannot manage large systems. That is where Kubernetes enters.

The Problem Docker Cannot Solve Alone

• What if container crashes?
• What if traffic suddenly increases?
• What if multiple servers are involved?

What Kubernetes Does

Kubernetes is a container orchestration system. It manages containers automatically.

• Auto-restarts containers
• Scales applications
• Distributes load
• Manages deployments

Docker vs Kubernetes

Docker runs containers. Kubernetes manages containers.

Basic Kubernetes Concepts

• Pod — smallest unit
• Node — machine
• Cluster — group of nodes
• Service — network access

Important Truth

You must understand Docker before Kubernetes. Skipping Docker causes confusion later.

Next, we see how Docker fits into a DevOps workflow.