Labels

• Key/Value Pairs that are attached to objects like pods, services and deployments.
• They are for kubernetes users to identify attributes for objects.
• Labels are defined in metadata.labels field for the k8s object

apiVersion: v1
kind: Pod
metadata:
  name: label-demo
  labels:
    environment: production
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:1.14.2
    ports:
    - containerPort: 80

Selectors

Types:

• Equality-based:
  • =
  • !=
• Set-based:
  • IN
  • NOTIN
  • EXISTS

Labels and Selectors are used in kubectl command

Namespaces

• Great for large enterprises
• Allows teams to access resources, with accountability. For eg. Order Status Team, Catalog Team etc.
• provides scope for (object) names - names must be unique in a namespace
• Default namespace created automatically and objects placed there
• Newer applications install their resources in a different namespace