Tasks

1. Create a namespace named storage-lab

   Solution

   PVC and workload resources live in this namespace. The PV itself is cluster-scoped.

   kubectl create namespace storage-lab

2. Create a PersistentVolume named data-pv with hostPath /mnt/data, capacity 1Gi, accessMode ReadWriteOnce, storageClassName manual, reclaimPolicy Retain

   ○
   Solution

   No imperative command exists for PersistentVolume. In the exam, open the docs at Concepts > Storage > Persistent Volumes and copy the hostPath example. PV is cluster-scoped, no -n flag needed.

   apiVersion: v1
   kind: PersistentVolume
   metadata:
     name: data-pv
   spec:
     capacity:
       storage: 1Gi
     accessModes:
       - ReadWriteOnce
     persistentVolumeReclaimPolicy: Retain
     storageClassName: manual
     hostPath:
       path: /mnt/data

   kubectl apply -f pv.yaml

3. Create a PersistentVolumeClaim named data-pvc in namespace storage-lab with storageClassName manual, accessMode ReadWriteOnce, and requested storage 500Mi

   ○
   Solution

   No imperative command exists for PersistentVolumeClaim. In the exam, open the docs at Concepts > Storage > Persistent Volumes > PersistentVolumeClaims. Save the exemple in a file with nano and update it before applying it. storageClassName and accessModes must match the PV exactly for binding to succeed.

   apiVersion: v1
   kind: PersistentVolumeClaim
   metadata:
     name: data-pvc
     namespace: storage-lab
   spec:
     storageClassName: manual
     accessModes:
       - ReadWriteOnce
     resources:
       requests:
         storage: 500Mi

   kubectl apply -f pvc.yaml

4. Create pod storage-pod in namespace storage-lab, image busybox:1.36, command sleep 3600, with a volume from PVC data-pvc mounted at /data

   ○
   Solution

   Generate a base manifest quickly with kubectl: Then adapt it so pod.yaml matches this final manifest: The name value must be identical in volumes and volumeMounts.

   kubectl run storage-pod -n storage-lab --image=busybox:1.36 --dry-run=client -o yaml -- sleep 3600 > pod.yaml

   apiVersion: v1
   kind: Pod
   metadata:
     name: storage-pod
     namespace: storage-lab
   spec:
     containers:
       - name: storage-pod
         image: busybox:1.36
         command: ["sleep", "3600"]
         volumeMounts:
           - name: data
             mountPath: /data
     volumes:
       - name: data
         persistentVolumeClaim:
           claimName: data-pvc

   kubectl apply -f pod.yaml
   kubectl wait --for=condition=Ready pod/storage-pod -n storage-lab --timeout=60s

5. Write a file inside storage-pod to confirm the volume is writable, then read it back

   Solution

   If the mount is correct, write and read both succeed.

   kubectl exec -n storage-lab storage-pod -- sh -c 'echo cka-ok > /data/probe.txt && cat /data/probe.txt'