Labels, Selectors and Annotations

Labels and selectors are a standard method to group things together.

kubectl run nginx --image=nginx -l="app=nginx,tier=frontend"

Annotations are for informational purpose.

Rolling Updates and Rollback Deployments

When creating deployments, a rollout is triggered. Each rollout creates a revision. When container image are updated, a new rollout is triggered. Commands:

kubectl rollout history deployment/my-deployment
kubectl rollout status deployment/my-deployment

# Restart
kubectl rollout restart deployment/my-deployment

# Rollback
kubectl rollout undo deployment/my-deployment