Docker volume backup and restore scripts.

README.md

Docker volume backup and restore scripts

Backup a Docker volume to tar archive:

$ ./docker-volume-backup.sh \
  DOCKER_VOLUME_NAME \
  ARCHIVE_NAME.tgz

Restore tar archive into Docker volume:

$ ./docker-volume-backup.sh \
  ARCHIVE_NAME.tgz \
  DOCKER_VOLUME_NAME

docker-volume-backup.sh

#!/bin/bash -e

BACKUP_PATH="/volume-backup"
VOLUME_MOUNT_PATH="/data"


function exitError {
	echo "Error: $1" >&2
	exit 1
}

function main {
	if [[ -z $1 ]]; then
		exitError "missing source Docker volume name"
	fi

	if [[ -z $(docker volume ls --filter "name=$1" --quiet) ]]; then
		exitError "unknown Docker volume [$1]"
	fi

	if [[ -z $2 ]]; then
		exitError "missing target archive filename"
	fi

	docker run \
		--mount "type=bind,src=$(pwd),dst=$BACKUP_PATH" \
		--mount "type=volume,src=$1,dst=$VOLUME_MOUNT_PATH" \
		--rm \
			alpine:latest \
				/bin/sh -c "/bin/tar c -zf '$BACKUP_PATH/$2' -C $VOLUME_MOUNT_PATH ."
}


main "$1" "$2"

docker-volume-restore.sh

#!/bin/bash -e

BACKUP_PATH="/volume-backup"
VOLUME_MOUNT_PATH="/data"


function exitError {
	echo "Error: $1" >&2
	exit 1
}

function main {
	if [[ -z $1 ]]; then
		exitError "missing source archive filename"
	fi

	if [[ ! -f $1 ]]; then
		exitError "unable to locate archive [$1]"
	fi

	if [[ -z $2 ]]; then
		exitError "missing target Docker volume name"
	fi

	if [[ -n $(docker volume ls --filter "name=$2" --quiet) ]]; then
		exitError "target Docker volume [$2] already exists"
	fi

	docker run \
		--mount "type=bind,src=$(pwd),dst=$BACKUP_PATH" \
		--mount "type=volume,src=$2,dst=$VOLUME_MOUNT_PATH" \
		--rm \
			alpine:latest \
				/bin/sh -c "cd '$VOLUME_MOUNT_PATH' && tar x -f '$BACKUP_PATH/$1'"
}


main "$1" "$2"