"Rename" a bound PVC

rename-pvc.sh

#! /bin/bash

set -e -o pipefail

function usage {
    cat - <<USAGE
Usage:
    $0 -n namespace -s source -d destination
USAGE
}

while getopts "d:hn:s:" opt; do
    case ${opt} in
    d)
        DESTINATION_NAME="$OPTARG";;
    h)
        usage "$0"
        exit 0;;
    n)
        NAMESPACE="$OPTARG";;
    s)
        SOURCE_NAME="$OPTARG";;
    \?)
        usage "$0"
        exit 1;;
    esac
done
shift $((OPTIND-1))

if [[ -z "$DESTINATION_NAME" || -z "$SOURCE_NAME" || -z "$NAMESPACE" ]]; then
    usage "$0"
    exit 1
fi

# Save source PVC
SOURCE_PVC=$(mktemp /tmp/pvc-XXXXXX.json)
kubectl -n "$NAMESPACE" get pvc "$SOURCE_NAME" -ojson > "$SOURCE_PVC"

# Create destination from source
# Strip out unneeded info & change name
DESTINATION_PVC=$(mktemp /tmp/pvc-XXXXXX.json)
jq "del(.metadata.annotations.\"pv.kubernetes.io/bind-completed\") |
    del(.metadata.creationTimestamp) |
    del(.metadata.finalizers[] | select(. == \"kubernetes.io/pvc-protection\")) |
    del(.metadata.resourceVersion) |
    del(.metadata.selfLink) |
    del(.metadata.uid) |
    del(.status) |
    .metadata.name = \"$DESTINATION_NAME\"" \
    "$SOURCE_PVC" > "$DESTINATION_PVC"

kubectl create -f "$DESTINATION_PVC"

# Set PV to retain
PV_NAME=$(jq -r .spec.volumeName "$SOURCE_PVC")
ORIG_RECLAIM=$(kubectl get pv "$PV_NAME" -ojson | jq -r .spec.persistentVolumeReclaimPolicy)
kubectl patch pv "$PV_NAME" --patch '{"spec": {"persistentVolumeReclaimPolicy": "Retain"}}'

# Delete source PVC
kubectl -n "$NAMESPACE" delete pvc "$SOURCE_NAME"

# Wait for PV to be Released
while [[ "$(kubectl get pv "$PV_NAME" -ojson | jq -r .status.phase)" != "Released" ]]; do
    echo "Waiting for PV to be Released"
    sleep 5
done

# Change PV to point to dest, mark available
kubectl patch pv "$PV_NAME" --type json --patch \
"[
    {\"op\": \"replace\", \"path\": \"/spec/claimRef/name\", \"value\": \"$DESTINATION_NAME\"},
    {\"op\": \"remove\", \"path\": \"/spec/claimRef/resourceVersion\"},
    {\"op\": \"remove\", \"path\": \"/spec/claimRef/uid\"},
    {\"op\": \"replace\", \"path\": \"/status.phase\", \"value\": \"Available\"},
]"

# Wait for PV to bind to new PVC
while [[ "$(kubectl -n "$NAMESPACE" get pvc "$DESTINATION_NAME" -ojson | jq -r .status.phase)" != "Bound" ]]; do
    echo "Waiting for PVC to Bind"
    sleep 5
done
while [[ "$(kubectl get pv "$PV_NAME" -ojson | jq -r .status.phase)" != "Bound" ]]; do
    echo "Waiting for PV to Bind"
    sleep 5
done

# Change PV to back to original reclaim policy
kubectl patch pv "$PV_NAME" --patch "{\"spec\": {\"persistentVolumeReclaimPolicy\": \"$ORIG_RECLAIM\"}}"

rm "$SOURCE_PVC" "$DESTINATION_PVC"

nice!

Thanks a lot, works like a charm 👍

A small addition is that the last 3 kubectl commands (2 while-s and the patch) also require a namespace parameter 👌

Thanks for pointing that out. I updated L78 to have the namespace. The others reference PVs which aren't namespaced, so those should be ok as is.

tks