What are Vertical Pod Autoscalers (VPA) in Kubernetes used for?

What are Vertical Pod Autoscalers (VPA) in Kubernetes used for?

• A. They adjust the size of the Kubernetes cluster
• B. They scale the number of replicas for an application
• C. They adjust the resource requests and limits of a pod
• D. They run in response to events

Answer: (C)

Vertical Pod Autoscaler concentrates on tuning the resources allocated to each container inside a pod. It watches how much CPU and memory a pod actually uses and updates the resource requests and limits in the pod's specification accordingly. This helps ensure pods have enough resources to run efficiently without wasting capacity, and it can trigger a rollout to apply the new resource values through the workload (Deployment, StatefulSet, etc.). It’s different from scaling the number of pods (that’s Horizontal Pod Autoscaler) and from changing the cluster size. Use of VPA aims to keep resource provisioning aligned with actual usage, but be mindful that changing resources can cause restarts during rollouts and may not be ideal for all workloads.

Vertical Pod Autoscaler concentrates on tuning the resources allocated to each container inside a pod. It watches how much CPU and memory a pod actually uses and updates the resource requests and limits in the pod's specification accordingly. This helps ensure pods have enough resources to run efficiently without wasting capacity, and it can trigger a rollout to apply the new resource values through the workload (Deployment, StatefulSet, etc.). It’s different from scaling the number of pods (that’s Horizontal Pod Autoscaler) and from changing the cluster size. Use of VPA aims to keep resource provisioning aligned with actual usage, but be mindful that changing resources can cause restarts during rollouts and may not be ideal for all workloads.