K8s namespace

K8s default namespaces

kube-system:

• Do NOT create or modify in kube-system
• System processes
• Master and Kubectl processes

kube-public

• Publicly accessible data

kube-node-lease

• Heartbeats of nodes, availability of a node

default

• Resources/Components will be created within this namespace if we do not set namespace when creating

kubectl create namespace my-namespace

Use cases

• Structure your components
• Avoid conflict between teams (order, payment, inventory,…)
• Share services between different environments (database, ELK stack, monitoring,…)
• Access and Resource Limits on Namespaces Level

Persistent volumes, node can’t be created within a Namespace

kubectl api-resources --namespaced=false

Create component within a Namespace

kubectl apply -f my-service.yaml --namespace=my-namespace

or but it in .yaml file itself (recommended)

apiVersion: v1
kind: Service
metadata:
  namespace: my-namespace

Change active namespace with kubens

1. Install

brew install kubectx

1. Get list

kubens

1. Switch active namespace

kubens my-namespace