Creates a docker image from a data container

create-image-from-datacontainer.sh

#!/bin/bash

usage()
{
    echo "usage: ./publish-data-container.sh -c <Data Container> -i <Image name to create/tag> -f <Folder path to backup> -b <Base image to use for backup container - defaults to alpine:latest>"
}

while getopts c:i:f:b: option
do
case "${option}"
in
c) CONTAINER=$OPTARG;;
i) IMAGENAME=$OPTARG;;
f) FOLDERTOBAK=$OPTARG;;
b) BAKIMG=$OPTARG;;
esac
done

if  [ -z "$CONTAINER" ] || [ -z "$IMAGENAME" ] || [ -z "$FOLDERTOBAK" ] ; then
    usage
    exit
fi

if [ -z "$BAKIMG" ] ; then  
    BAKIMG="alpine:latest"
fi

# Create a temp directory and cd into it
ORIGDIR=$(pwd)
cd "$(mktemp -d)"
TMPDIR=$(pwd)

echo "Creating image '${IMAGENAME}' from data container '${CONTAINER}'..."

TMPCONTAINER="$CONTAINER-bak"

sudo docker run -it --volumes-from $CONTAINER --name $TMPCONTAINER $BAKIMG /bin/sh -c "cd / && tar cvf /bak.tar.gz $FOLDERTOBAK"
sudo docker cp $TMPCONTAINER:/bak.tar.gz $(pwd)/bak.tar.gz
sudo docker rm $TMPCONTAINER -f

cat > $(pwd)/Dockerfile << dockerfile
FROM $BAKIMG

ADD bak.tar.gz /
dockerfile

sudo docker image build -t $IMAGENAME .

sudo docker volume prune

cd $ORIGDIR
echo "Cleaning up files..."
rm -rf $TMPDIR

Developed from:

https://dzone.com/articles/docker-backup-your-data-volumes-to-docker-hub

Hi. I am curious: How can I then use the image to use (restore) the backed-up volume in a new container? Thanks!