Horizontal scaling, also called scaling out, increases application capacity by running additional instances. When one instance cannot handle growing user traffic, replicas distribute requests and keep the service available. section 3.3.3
Scale a Deployment to three replicas
Run `kubectl scale deployment kiada --replicas=3`. Kubernetes updates the Deployment's desired replica count, creates the missing Pods, and reconciles the running state until three replicas are available. section 3.3.3
Use the command listing to see the concise kubectl operation that changes the Deployment replica count. section 3.3.3
After scaling:
- The Deployment reports three up-to-date, available replicas. section 3.3.3
- The replicas are separate Pods rather than three containers in one Pod. section 3.3.3
- The Service can load-balance requests across the Pods. section 3.3.3
