Сохранение и загрузка нескольких Docker образов⁠⁠

Исходный код представленный в этой заметке доступен в моем репозитории GitHub.

Код скрипта для сохранения (save-images.sh):

#!/bin/bash

list="images.txt"

images="images.tar.gz"

usage() {

echo "USAGE: $0 [--image-list images.txt] [--images images.tar.gz]"

echo " [-l|--image-list path] text file with list of images; one image per line."

echo " [-i|--images path] tar.gz generated by docker save."

echo " [-h|--help] Usage message"

}

POSITIONAL=()

while [[ $# -gt 0 ]]; do

key="$1"

case $key in

-i | --images)

images="$2"

shift # past argument

shift # past value

;;

-l | --image-list)

list="$2"

shift # past argument

shift # past value

;;

-h | --help)

help="true"

shift

;;

*)

usage

exit 1

;;

esac

done

if [[ $help ]]; then

usage

exit 0

fi

pulled=""

while IFS= read -r i; do

[ -z "${i}" ] && continue

if docker pull "${i}" >/dev/null 2>&1; then

echo "Image pull success: ${i}"

pulled="${pulled} ${i}"

else

if docker inspect "${i}" >/dev/null 2>&1; then

pulled="${pulled} ${i}"

else

echo "Image pull failed: ${i}"

fi

fi

done <"${list}"

echo "Creating ${images} with $(echo ${pulled} | wc -w | tr -d '[:space:]') images"

docker save $(echo ${pulled}) | gzip --stdout >${images}

Код для загрузки (load-images.sh):

#!/bin/bash

images="images.tar.gz"

list="images.txt"

windows_image_list=""

windows_versions="1809"

usage() {

echo "USAGE: $0 [--images images.tar.gz] --registry my.registry.com:5000"

echo " [-l|--image-list path] text file with list of images; one image per line."

echo " [-i|--images path] tar.gz generated by docker save."

echo " [-r|--registry registry:port] target private registry:port."

echo " [--windows-image-list path] text file with list of images used in Windows. Windows image mirroring is skipped when this is empty"

echo " [--windows-versions version] Comma separated Windows versions. e.g., \"1809,2004,20H2\". (Default \"1809\")"

echo " [-h|--help] Usage message"

}

push_manifest() {

export DOCKER_CLI_EXPERIMENTAL=enabled

manifest_list=()

for i in "${arch_list[@]}"; do

manifest_list+=("$1-${i}")

done

echo "Preparing manifest $1, list[${arch_list[@]}]"

docker manifest create "$1" "${manifest_list[@]}" --amend

docker manifest push "$1" --purge

}

while [[ $# -gt 0 ]]; do

key="$1"

case $key in

-r | --registry)

reg="$2"

shift # past argument

shift # past value

;;

-l | --image-list)

list="$2"

shift # past argument

shift # past value

;;

-i | --images)

images="$2"

shift # past argument

shift # past value

;;

--windows-image-list)

windows_image_list="$2"

shift # past argument

shift # past value

;;

--windows-versions)

windows_versions="$2"

shift # past argument

shift # past value

;;

-h | --help)

help="true"

shift

;;

*)

usage

exit 1

;;

esac

done

if [[ -z $reg ]]; then

usage

exit 1

fi

if [[ $help ]]; then

usage

exit 0

fi

docker load --input ${images}

linux_images=()

while IFS= read -r i; do

[ -z "${i}" ] && continue

linux_images+=("${i}")

done <"${list}"

arch_list=()

if [[ -n "${windows_image_list}" ]]; then

IFS=',' read -r -a versions <<<"$windows_versions"

for version in "${versions[@]}"; do

arch_list+=("windows-${version}")

done

windows_images=()

while IFS= read -r i; do

[ -z "${i}" ] && continue

windows_images+=("${i}")

done <"${windows_image_list}"

# use manifest to publish images only used in Windows

for i in "${windows_images[@]}"; do

if [[ ! " ${linux_images[@]}" =~ " ${i}" ]]; then

case $i in

*/*)

image_name="${reg}/${i}"

;;

*)

image_name="${reg}/${i}"

;;

esac

push_manifest "${image_name}"

fi

done

fi

arch_list+=("linux-amd64")

for i in "${linux_images[@]}"; do

[ -z "${i}" ] && continue

arch_suffix=""

use_manifest=false

if [[ (-n "${windows_image_list}") && " ${windows_images[@]}" =~ " ${i}" ]]; then

# use manifest to publish images when it is used both in Linux and Windows

use_manifest=true

arch_suffix="-linux-amd64"

fi

case $i in

*/*)

image_name="${reg}/${i}"

;;

*)

image_name="${reg}/${i}"

;;

esac

docker tag "${i}" "${image_name}${arch_suffix}"

docker push "${image_name}${arch_suffix}"

if $use_manifest; then

push_manifest "${image_name}"

fi

done

Пример списка образов (images.txt):

quay.io/prometheus/prometheus:v2.36.1

quay.io/prometheus/node-exporter:v1.3.1

grafana/grafana:9.0.3