Creates a tarball of the contents of a Longhorn volume

backup-standalone-longhorn-replica.sh

#!/bin/sh

REPLICA_NAME="$(basename $1)"
SIZE="$(jq .Size /var/lib/longhorn/replicas/$REPLICA_NAME/volume.meta)"
TEMP_DIR="$(mktemp -d)"

echo "Backing up replica $REPLICA_NAME"

CONTAINER_ID=$(docker run -d --rm -v /dev:/host/dev -v /proc:/host/proc -v /var/lib/longhorn/replicas/$REPLICA_NAME:/volume --privileged longhornio/longhorn-engine:v1.6.2 launch-simple-longhorn $REPLICA_NAME $SIZE)

echo "Container is $CONTAINER_ID"
echo "Waiting for block device to enumerate"

until [ -b /dev/longhorn/$REPLICA_NAME ]; do
  sleep 5
  echo "Still not available..."
done

echo "Block device available"

mount -o ro /dev/longhorn/$REPLICA_NAME $TEMP_DIR
tar czvf $REPLICA_NAME.tar.gz $TEMP_DIR
umount $TEMP_DIR
docker stop $CONTAINER_ID