Rename or migrate a PVC from one namespace to another

kubectl-mvpvc

#!/bin/bash
set -euo pipefail

if [[ $# -ne 2 ]]; then
  echo "Usage: kubectl-mvpvc <ns1/pvc1> <ns2/pvc2>"
  exit 1
fi

NS_PVC_FROM=$1
NS_PVC_TO=$2


if [[ "$NS_PVC_FROM" =~ ([^/]*)/([^/]*) ]]; then
  NS_FROM=${BASH_REMATCH[1]}
  PVC_FROM=${BASH_REMATCH[2]}
else
  echo "invalid input: ${NS_PVC_FROM}"
  exit 1
fi

if [[ "$NS_PVC_TO" =~ ([^/]*)/([^/]*) ]]; then
  NS_TO=${BASH_REMATCH[1]}
  PVC_TO=${BASH_REMATCH[2]}
else
  echo "invalid input: ${NS_PVC_TO}"
  exit 1
fi


kubectl -n ${NS_FROM} get pvc "$PVC_FROM" > /dev/null
kubectl get ns "$NS_TO" > /dev/null

if ! kubectl -n "${NS_FROM}" describe pvc "${PVC_FROM}" | grep -q 'Mounted By:    <none>';  then
  echo "error: pvc is mounted"
  exit 1
fi


PVC_BACKUP="${NS_FROM}_${PVC_FROM}.json"
kubectl -n ${NS_FROM} get pvc ${PVC_FROM} -o json > ${PVC_BACKUP}
pv=$(cat ${PVC_BACKUP} | jq -r .spec.volumeName)
echo "pv: ${pv}"


kubectl patch pv "$pv" -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
kubectl -n ${NS_FROM} delete pvc ${PVC_FROM}
kubectl patch pv "$pv" -p '{"spec":{"claimRef":null}}'

cat "${PVC_BACKUP}" | jq ".metadata.name |= \"${PVC_TO}\" | .metadata.namespace |= \"${NS_TO}\"" | kubectl apply -f -