# ================================
# DATABASUS - ONE-TIME MIGRATION JOB
# Copies data from old local PVC → new ceph PVC
#
# Steps:
#   1. Scale down databasus deployment:
#        kubectl scale deployment databasus --replicas=0
#   2. Apply databasus-storage.yaml (creates new ceph PVC):
#        kubectl apply -f databasus-storage.yaml
#   3. Apply this file:
#        kubectl apply -f databasus-migration-job.yaml
#   4. Wait for job to complete:
#        kubectl wait --for=condition=complete job/databasus-migration --timeout=120s
#   5. Verify data in new PVC:
#        kubectl logs job/databasus-migration
#   6. Apply updated databasus.yaml (uses ceph PVC, drops local PV/PVC):
#        kubectl apply -f databasus.yaml
#   7. Delete the old local PV and its PVC:
#        kubectl delete pvc databasus-pvc-local
#        kubectl delete pv databasus-pv
#   8. Delete this job:
#        kubectl delete job databasus-migration
# ================================

---
# Rename the old local PVC binding so both can coexist during migration.
# Since the old PVC is named databasus-pvc, the new ceph one uses the same
# name — so you must delete or rename the old one first, OR use this job
# which mounts the old PV directly via a temporary PVC alias below.

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: databasus-pvc-local
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: databasus-local-storage
  resources:
    requests:
      storage: 500Mi
  # Bind to the existing local PV explicitly
  volumeName: databasus-pv

---
apiVersion: batch/v1
kind: Job
metadata:
  name: databasus-migration
spec:
  template:
    spec:
      nodeSelector:
        kubernetes.io/hostname: mist
      restartPolicy: Never
      containers:
        - name: migrate
          image: busybox
          command:
            - sh
            - -c
            - |
              echo "=== Starting migration ==="
              echo "Source contents:"
              ls -lah /old-data/
              echo ""
              echo "Copying data..."
              cp -av /old-data/. /new-data/
              echo ""
              echo "=== Migration complete ==="
              echo "New data contents:"
              ls -lah /new-data/
          volumeMounts:
            - name: old-data
              mountPath: /old-data
              readOnly: true
            - name: new-data
              mountPath: /new-data
      volumes:
        - name: old-data
          persistentVolumeClaim:
            claimName: databasus-pvc-local
        - name: new-data
          persistentVolumeClaim:
            claimName: databasus-pvc