Dump and restore docker volumes

docker-volume-dump.sh

#!/usr/bin/env bash

dump_dir=~/docker-volume-dump

if [ ! -d $dump_dir ]; then
  mkdir -p $dump_dir
fi

for volume in $(docker volume ls -q); do
  dump_file=$dump_dir/$volume.tar.gz
  if [ -f $dump_file ]; then
    ( set -x; echo rm $dump_file; )
  fi
  echo "Dump docker volume \"$volume\" to \"$dump_file"\"
  docker run --rm -v $volume:/from alpine sh -c "cd /from; tar -cf - ." | gzip > $dump_dir/$volume.tar.gz
done

docker-volume-restore.sh

#!/usr/bin/env bash

dump_dir=~/docker-volume-dump

for file in ~/docker-volume-dump/* ; do
  volume=$(basename $file)
  volume=${volume%%.*}
  echo "$volume"
  docker volume inspect $volume &>/dev/null
  if [ $? -eq 0 ]; then
    ( set -x; docker volume rm $volume 1>/dev/null )
  fi
  ( set -x; docker volume create $volume 1>/dev/null )
  cat $file | docker run --rm -i -v $volume:/to alpine sh -c 'tar zxvf - -C /to'
done