k8s InPlacePodVerticalScaling

Kubernetes InPlacePodVerticalScaling feature

Kubernetes v1.27 introduces InPlacePodVerticalScaling, allowing pod resource resizing without restarts

This eliminates the downtime and potential data loss caused by pod restarts. It also helps avoid overprovisioning, since InPlacePodVerticalScaling lets you allocate resources precisely as needed

In this example for pod memory resources configuration, the resizePolicy indicates that changes to the memory allocation require a restart of the container, and for CPU resources the restart is not necessary during resizing.

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cat <<EOF | kubectl apply -f -
---
apiVersion: v1
kind: Pod
metadata:
  labels:
    run: nginx
  name: nginx
spec:
  containers:
  - image: nginx
    name: nginx
    resizePolicy:
    - resourceName: "memory"
      restartPolicy: "RestartContainer"
    - resourceName: "cpu"
      restartPolicy: "NotRequired"
    resources:
      limits:
        cpu: "300m"
        memory: "1Gi"
      requests:
        cpu: "100m"
        memory: "500Mi"
EOF

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