Docker Image Backup Skript

The script docker_image_backup.sh creates a local copy of the docker images and save them under /data01/save/. With the script you have the possibility to save (docker save) or load (docker load) docker images.

[root@v81elt dc-config]# ./docker_image_backup.sh -h
 Usage: ./docker_image_backup.sh [OPTIONS] [IMAGE:TAG]
 Example: ./docker_image_backup.sh -s docker.pnet.ch/toolchain/artifactory:5.4.6-0
OPTIONS:
   -s | --save         Save image (backup) [IMAGE:TAG] or [all]
   -l | --load         Load image (recover) [IMAGE:TAG]
   -d | --delete       Delete older images (backuped) than 90days
   -h | --help         Help
[root@v81elt dc-config]# docker images | grep artifactory
docker.pnet.ch/tool/artifactory                5.8.3-ha            5ccd33d863cc        3 weeks ago         657 MB
[root@v81elt dc-config]# ./docker_image_backup.sh -s docker.pnet.ch/tool/artifactory:5.8.3-ha
Create backup of docker.pnet.ch/tool/artifactory:5.8.3-ha to /data01/save/ ...
Backup created successfully.
[root@v81elt dc-config]# ls -la /data01/save/ | grep artifactory
-rw-------. 1 root docker 669214720 Mar 19 08:50 docker.pnet.ch.tool.artifactory.5.8.3-ha.tar

Filename: docker_image_backup.sh

#!/bin/bash
#
# Usage:         ./docker_image_backup.sh [OPTIONS] [IMAGE:TAG]
#
# Documentation: https://wikit.post.ch/display/DEVPLAT/Local+Docker+Image+Backup
#
# Author:        Jan Schneider, jan.schneider@post.ch, I353
#
# ---------------------------------------------------------------------------------
# Edition history:
#
# Version    Date        Who     What
# 0.0.1      13.03.18    SchJ    initial version
# 0.0.2      26.03.18    SchJ    remove function

dockerbin=`which docker`
if [ -z "$dockerbin" ]; then echo "No docker binary found"; exit 1; fi

savedir=/data01/save/
[[ -d $savedir ]] || mkdir -p $savedir


function usage {
# View the usage message

echo -e "\e[1;35mUsage: ./docker_image_backup.sh [OPTIONS] [IMAGE:TAG]\e[0m"
cat <<EOF
Example: ./docker_image_backup.sh -s docker.pnet.ch/toolchain/artifactory:5.4.6-0

OPTIONS:
  -s | --save         Save image (backup) [IMAGE:TAG] or [all]
  -l | --load         Load image (recover) [IMAGE:TAG]
  -d | --delete       Delete older images (backuped) than 90days
  -h | --help         Help
EOF
}

function delete {
    find $savedir -type f -mtime +90 -delete
}

function save {
	tarfile=`echo $1 | tr -s "/:" "."`.tar
	echo "Create backup of $1 to $savedir ..."
	$dockerbin save -o $savedir/$tarfile $1

	if [ $? -eq 0 ]; then
		echo "Backup created successfully."
	else
		echo "Backup creation failed!"
		exit 1
	fi
}

function save_all {
	for image in `$dockerbin images | tr -s " " | cut -d" " -f-2 | grep -v "REPOSITORY TAG" | tr " " ":"`; do
		save $image
	done
}


function load {
	tarfile=`echo $1 | tr -s "/:" "."`.tar
	if [ ! -f $savedir/$tarfile ]; then
    	echo "Backup tar not found!"
		exit 1
	fi
	echo "Loading backup tar of $1 ..."
	$dockerbin load < $savedir/$tarfile
	
	if [ $? -eq 0 ]; then
        echo "Backup successfully loaded."
    else
        echo "Backup loading failed!"
        exit 1
    fi
}


while true; do
        case "$1" in
                -h|--help)
                        usage
                        shift
                        ;;
                -d|--delete)
                        delete
                        shift
                        ;;
		-s|--save)
			shift
			if [[ "$1" = "all" ]]; then
				save_all
				shift
			else
				while [[ "$1" != "-"* && "$1" != "" ]]; do
	                          	save $1
        	                    	shift
                        	done
			fi
                        ;;
                -l|--load)
                        shift
                        while [[ "$1" != "-"* && "$1" != "" ]]; do
                               load $1
                               shift
                        done
                        ;;
		*) exit 0 ;;
        esac
done