Kubernetes PVC migration

pvc-migrate.sh

#!/usr/bin/env bash
# -*- coding: utf-8 -*-

# usage:
# ./pvc-migrate <forward|backward> <namespace> [<source> [<dest>]]


DIRECTION="${1}"
NAMESPACE="${2}"

# provide defaults for source and dest if not given
if [ "$DIRECTION" = "forward" ]; then
    SOURCE="${3:-$NAMESPACE}"
    DEST="${4:-pvc-temp}"
elif [ "$DIRECTION" = "backward" ]; then
    SOURCE="${4:-pvc-temp}"
    DEST="${3:-$NAMESPACE}"
fi

# do migration
echo "Migrating data in namespace ${NAMESPACE} from ${SOURCE} to ${DEST}"
pv-migrate migrate "${SOURCE}" "${DEST}" \
    --source-kubeconfig ~/.kube/infrastructure/config \
    --source-context default \
    --source-namespace "${NAMESPACE}" \
    --dest-kubeconfig ~/.kube/infrastructure/config \
    --dest-context default \
    --dest-namespace "${NAMESPACE}" \
    --ignore-mounted

pvc-temp.yaml

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-temp
  namespace: <namespace> # set to namespace of target pvc
spec:
  resources:
    requests:
      storage: 10Gi # ensure same size as source pvc
  volumeMode: Filesystem
  storageClassName: local-path
  accessModes:
    - ReadWriteOnce
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pvc-temp
  namespace: <namespace> # set to namespace of target pvc
spec:
  selector:
    matchLabels:
      app: pvc-temp
  template:
    metadata:
      labels:
        app: pvc-temp
    spec:
      containers:
        - name: pvc-temp
          image: alpine:latest
          command: ['tail', '-f', '/dev/null']
          resources:
            limits:
              memory: 128Mi
              cpu: 500m
          volumeMounts:
            - name: pvc-temp
              mountPath: /data
              readOnly: true
      volumes:
        - name: pvc-temp
          persistentVolumeClaim:
            claimName: pvc-temp
      tolerations: [] # optional set tolerations if needed
      nodeSelector:
        kubernetes.io/hostname: '' # optional set target node if needed