pvc-autoresizer

Infra

Updated on July 27

PVC-Autoresizer Overview

Secure your stack with a hardened PVC-Autoresizer image freshly-built by Minimus. Minimus images always include the most up-to-date package version for all packages and dependencies contained in the image.

PVC-Autoresizer is a Kubernetes controller that automatically expands PersistentVolumeClaims when available storage falls below a configured threshold. It queries volume metrics from Prometheus or the Kubernetes Metrics API, and when free space drops below the defined threshold, it increases the PVC's requested capacity—up to a configurable maximum—without manual intervention. It works with any CSI driver that supports the volume expansion capability and NodeGetVolumeStats API.

Try It Out

PVC-Autoresizer runs as a controller inside your Kubernetes cluster and automatically expands PersistentVolumeClaims when free space falls below a configured threshold.

Prerequisites

A running Kubernetes cluster with a CSI driver that supports volume expansion and NodeGetVolumeStats
Helm v3.8 or higher (Installation instructions)
kubectl installed and configured
Prometheus deployed and collecting kubelet metrics or a metrics-server for Kubernetes Metrics API mode

Step 1 - Install via Helm

To install using Prometheus, point to your Prometheus endpoint:

helm repo add pvc-autoresizer https://topolvm.github.io/pvc-autoresizer/
helm install --create-namespace --namespace pvc-autoresizer pvc-autoresizer pvc-autoresizer/pvc-autoresizer \
  --set "controller.args.prometheusURL=<YOUR_PROMETHEUS_ENDPOINT>" \
  --set "image.repository=reg.mini.dev/pvc-autoresizer" \
  --set "image.tag=latest"

To install using the Kubernetes Metrics API enable the flag:

helm repo add pvc-autoresizer https://topolvm.github.io/pvc-autoresizer/
helm install --create-namespace --namespace pvc-autoresizer pvc-autoresizer pvc-autoresizer/pvc-autoresizer \
  --set "controller.args.useK8sMetricsApi=true" \
  --set "image.repository=reg.mini.dev/pvc-autoresizer" \
  --set "image.tag=latest"

Step 2 - Annotate a StorageClass

Add the resize.topolvm.io/enabled: "true" annotation to any StorageClass whose PVCs should be auto-resized. The StorageClass must also have allowVolumeExpansion: true.

kubectl annotate storageclass <YOUR_STORAGE_CLASS> resize.topolvm.io/enabled="true"

Step 3 - Annotate a PVC

Set the maximum size limit on any PVC you want auto-resized. PVC-Autoresizer will expand the volume up to this limit when free space falls below the threshold (default 10%).

kubectl annotate pvc <YOUR_PVC> resize.topolvm.io/storage_limit=100Gi

Technical Considerations

The PVC-Autoresizer image provided by Minimus is a slim, security-hardened alternative to the public image. The images are largely interchangeable, with a few differences as noted below.

PVC-Autoresizer built by Minimus:

Drill down on the version specification tab to see the default user, listening ports, entrypoint, volumes, environment variables, etc.

The Payoff

A hardened, minimal image that will remain more secure for the long run and accrue vulnerabilities at a slower rate.

See the risk reduction dashboard for a detailed CVE comparison over the past 30 days.
Review the compliance report to see the default hardening and security configurations for the image.

Terms & Info

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Disclaimer

Images are provided "as-is" without warranty of any kind. "Hardened" refers to the security configuration applied at the time of build and does not constitute a guarantee of ongoing security or absence of vulnerabilities. The free tier is provided without support, SLA, or guaranteed patching timelines. Security updates may be applied to paid subscriptions before or instead of free tier images. By pulling or using any image you agree to our Terms of Use.