Summary - Namespace

Combine create, list and -n to set up resource groups.

Summary: Namespaces

In this group:

A namespace divides the cluster into logical sections; names are unique within a namespace. Objects like Node and PV are cluster-scoped.
Ready namespaces: default, kube-system, kube-public, kube-node-lease.
Creation: create namespace or YAML; objects are placed with metadata.namespace. ResourceQuota and LimitRange limit resources.
-n for one command, -A for all namespaces; set-context --current --namespace changes the default.
A namespace doesn't isolate the network; NetworkPolicy is needed. Deleting it deletes what's inside.

kubectl create ns dev
kubectl config set-context --current --namespace=dev
kubectl get all -n dev

Exercise A namespace with a quota

Write a ResourceQuota YAML: name dev-kota, namespace dev; under spec.hard, requests.cpu: "4", requests.memory: 8Gi and pods: "20".

Show example solution

apiVersion: v1
kind: ResourceQuota
metadata:
  name: dev-kota
  namespace: dev
spec:
  hard:
    requests.cpu: "4"
    requests.memory: 8Gi
    pods: "20"

Test yourself

With which name does a pod in the dev namespace reach the db service in prod?
- prod/db
- It can't
- db.prod
- db
Show answer

db.prod — The short name only resolves within the same namespace.

List the pods in all namespaces.

kubectl get pods ____

Show answer

kubectl get pods --all-namespaces

Match.

create ns

Create
-n

Select
-A

All
delete ns

Delete with contents

Next lesson: What is a label?

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