#StorageClass

K8s Intermediate #2: PV / PVC / StorageClass — The Persistent Data Model

Through [K8s Basics #6](/en/posts/k8s-basics-6) we pulled config and secrets out of the manifest into external objects, but one dimension remains — the data itself. The container filesystem disappears with the container, but DB data, user uploads, and metric time series have to outlive the Pod. This post fills that gap with the triangle of PersistentVolume, PersistentVolumeClaim, and StorageClass — static and dynamic provisioning, accessModes, reclaimPolicy, volumeBindingMode, and what StatefulSet's volumeClaimTemplates from [#1](/en/posts/k8s-intermediate-1) actually produces on top of all this.