kubectl scale deployment changes the number of pod replicas maintained for a Deployment. Scaling out adds replicas for increased demand; scaling in removes replicas to reduce capacity. section 3.4
A Deployment manages pods rather than individual containers. Kubernetes works toward the requested replica count, while Services provide stable access and internal load balancing for the application. section 3.4
Scaling an application
After scaling an application, inspect its Kubernetes resources and pods with kubectl get or kubectl describe. The observed pod count should move toward the requested number; newly created pods may briefly be unready, while scaled-down pods terminate. section 3.4 section 14.2.1
