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Creating Pods

Pods are equivalent to bricks we use to build houses. Both are uneventful and not much by themselves. Yet, they are fundamental building blocks without which we could not construct the solution we are set to build.

If you used Docker or Docker Swarm, you're probably used to thinking that a container is the smallest unit and that more complex patterns are built on top of it. With Kubernetes, the smallest unit is a Pod. A Pod is a way to represent a running process in a cluster. From Kubernetes' perspective, there's nothing smaller than a Pod.

A Pod encapsulates one or more containers. It provides a unique network IP, it attaches storage resources, and it decides how containers should run. Everything in a Pod is tightly coupled.

We should clarify that containers in a Pod are not necessarily made by Docker. Other container runtimes are supported as well. Still, at the time of this writing, Docker is the most commonly used container runtime, and all our examples will use it.

From this chapter onward, we will break the publishing tradition of having a long explanation of concepts before diving into practical examples. Instead, we'll try to learn theory through practice. One step at a time.

We'll move straight into hands-on exercises. Since we cannot create Pods without a Kubernetes cluster, our first order of business is to create one.

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