Docker Backup External Volume

Backup docker volumn script:

Script 1: backup.sh

# This script allows you to backup a single volume from a container
# Data in given volume is saved in the current directory in a tar archive.
CONTAINER_NAME=$1
VOLUME_PATH=$2

usage() {
  echo "Usage: $0 [container name] [volume path]"
  exit 1
}

if [ -z $CONTAINER_NAME ]
then
  echo "Error: missing container name parameter."
  usage
fi

if [ -z $VOLUME_PATH ]
then
  echo "Error: missing volume path parameter."
  usage
fi

sudo docker run --rm --volumes-from $CONTAINER_NAME -v $(pwd):/backup busybox tar cvf /backup/backup.tar $VOLUME_PATH

Script 2: restore.sh

# This script allows you to restore a single volume from a container
# Data in restored in volume with same backupped path
NEW_CONTAINER_NAME=$1

usage() {
  echo "Usage: $0 [container name]"
  exit 1
}

if [ -z $NEW_CONTAINER_NAME ]
then
  echo "Error: missing container name parameter."
  usage
fi

sudo docker run --rm --volumes-from $NEW_CONTAINER_NAME -v $(pwd):/backup busybox tar xvf /backup/backup.tar

Reference:

• https://stackoverflow.com/questions/26331651/how-can-i-backup-a-docker-container-with-its-data-volumes