Pod Theory

Introduction

The atomic unit of scheduling in the virtualization world is the virtual machine (VM). This means deploying applications in the virtualization world is done by scheduling them on VMs.

In the Docker world, the atomic unit is the container. This means deploying applications on Docker is done by scheduling them inside of containers.

In the Kubernetes world, the atomic unit is the Pod. Ergo, deploying applications on Kubernetes means stamping them out in Pods.

This is fundamental to understanding Kubernetes, so be sure to flag it in your brain as important >> Virtualization uses VMs, Docker uses containers, and Kubernetes uses Pods.