Kubernetes 101 – Namespaces

Intro

Before jumping into Kubernetes resources, let’s take a look over a very important concept called Namespace.

Namespaces are a way to separate cluster resources.

Namespace-based scoping is applicable only for certain types of objects (e.g. Pods Deployments, Services, etc.) and not for cluster-wide objects (e.g. StorageClass, Nodes, PersistentVolumes, etc.).
Usage

Retrieve all defined namespaces.

>> kubectl get namespace

If none specified, the resources are created in the ‘default’ namespace.

Create a new namespace called ‘test’.

>> kubectl create namespace test

Create a pod in the newly created namespace.

>> kubectl run nginx-pod –-image=nginx –n test

We’ll talk about the pod object a lot more in the later posts.

For now, you only need to know that they are resources that can be grouped into different namespaces.

Retrieve all pods in the ‘test’ namespace.

>> kubectl get pods –n test
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