Docker-Compose volume backup

docker_volume_backup.sh

#!/bin/bash

compose_file_path=$1
project_name=$2
backup_path=$3

function backup_volume {
  volume_name=$1
  backup_destination=$2

  docker run --rm -v $volume_name:/data -v $backup_destination:/backup ubuntu tar -zcvf /backup/$volume_name.tar /data
}

echo "Stopping running containers"
docker-compose -f $compose_file_path stop

echo "Mounting volumes and performing backup..."
volumes=($(docker volume ls -f name=$project_name | awk '{if (NR > 1) print $2}'))
for v in "${volumes[@]}"
do
  backup_volume $v $backup_path
done

echo "Restarting containers"
docker-compose -f $compose_file_path start

Backup (i.e. core of the script above):

export VOLUME_NAME=flux_miniflux-db
export BACKUP_PATH=/srv/miniflux/backup
docker run --rm --volume $VOLUME_NAME:/data \
    -v $BACKUP_PATH:/backup ubuntu \
    tar -zcvf /backup/$VOLUME_NAME.tar /data

Restore (tested):

# cd into directory with volume as *tar
export VOLUME_NAME=flux_miniflux-db
docker run --rm  \
    --volume $VOLUME_NAME:/dbdata \
    --volume $(pwd):/backup ubuntu  \
    tar xvf /backup/$VOLUME_NAME.tar -C /dbdata --strip 1

Afterwards, check with

docker volume ls
>DRIVER    VOLUME NAME
>local     flux_miniflux-db