Storage

In the context of the Certified Kubernetes Administrator (CKA) exam, storage is a critical domain focusing on decoupling data persistence from the ephemeral lifecycle of containers. By default, data inside a container is lost if the container crashes or the Pod is deleted. Kubernetes resolves this using a specific abstraction layer consisting primarily of PersistentVolumes (PV), PersistentVolumeClaims (PVC), and StorageClasses. A **PersistentVolume (PV)** is a cluster-wide resource representing a piece of actual storage (like an NFS share, AWS EBS, or local disk) provisioned by an administrator. It exists independently of any Pod. A **PersistentVolumeClaim (PVC)** is a request for storage by a user. Similar to how a Pod consumes node resources (CPU/RAM), a PVC consumes PV resources. A PVC specifies the desired capacity, access modes (e.g., ReadWriteOnce, ReadWriteMany), and storage class. **StorageClasses** enable **Dynamic Provisioning**. Instead of an administrator manually creating PVs (Static Provisioning), a StorageClass defines a provisioner that automatically creates the required PV when a user submits a PVC. This automates storage management. For the CKA exam, you must be proficient in: 1. Creating PVs and PVCs manually. 2. Configuring Pods to use a PVC as a volume mount. 3. Understanding the binding process (how a PVC matches a PV). 4. Managing Access Modes and Reclaim Policies (Retain, Delete, Recycle). 5. Troubleshooting issues related to volume mounting and the Container Storage Interface (CSI). In the context of the Certified Kubernetes Administrator (CKA) exam, storage is a critical domain focusing on decoupling data persistence from the ephemeral lifecycle of containers. By default, data inside a container is lost if the container crashes or the Pod is deleted. Kubernetes resolves this …