Bits of .NET

🏷️ Labels = Tags for Kubernetes Resources

How to find all pods for an app? Labels and selectors group resources. Services find pods by labels. Deployments manage pod sets. Essential for organization.

📝 Adding Labels

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod
  labels:
    app: myapp
    environment: production
    tier: backend
    version: v1.0.0
    team: payments
spec:
  containers:
  - name: app
    image: myapp:latest

🎯 Using Selectors

# Service selecting pods by label
apiVersion: v1
kind: Service
metadata:
  name: myapp-service
spec:
  selector:
    app: myapp
    environment: production
  ports:
  - port: 80

# Deployment managing pods
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
spec:
  selector:
    matchLabels:
      app: myapp
      tier: backend
  template:
    metadata:
      labels:
        app: myapp
        tier: backend

# List pods by label
kubectl get pods -l app=myapp
kubectl get pods -l 'environment in (production, staging)'
kubectl get pods -l 'tier!=frontend'

💡 Label Best Practices

• app: Application name
• environment: dev, staging, prod
• tier: frontend, backend, cache, db
• version: v1.0.0, v2.0.0 (deployment tracking)
• team: owning team name
• Keep labels simple and consistent