Kubernetes Namespace Introduction and Practical Resource Operations

This article introduces Kubernetes namespaces and demonstrates practical resource operations for isolating workloads within a cluster.

A Namespace is a core Kubernetes resource used to achieve logical grouping and isolation of resources, enabling multi‑environment or multi‑tenant separation; by default all Pods can communicate, but placing them in different namespaces restricts cross‑namespace access.

Kubernetes creates four initial namespaces: default (used when no namespace is specified), kube-system (holds system components), kube-public (resources readable by all users), and kube-node-lease (maintains node heartbeat information).

To view all namespaces, run: kubectl get ns

Creating a new namespace can be done with: kubectl create ns tuoguan or by applying a manifest file: kubectl apply -f tuoguan.yaml Result: namespace/tuoguan created

To specify the output format of namespace information, use: kubectl get ns <namespace-name> -o <format> where format can be wide , json , or yaml .

Deleting a namespace is performed with: kubectl delete ns tuoguan or by removing the manifest file: kubectl delete -f tuoguan.yaml

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