离线导出和导入 Docker 镜像到仓库

参考 Rancher 离线安装脚本，对脚本进行简化。

功能：通过脚本可以从一个镜像仓库（例如 harbor）导出，然后导入到另一个镜像仓库。

首先需要整理要导出的镜像列表，写入 docker-images.txt 中，示例如下：

10.10.10.233/develop/assets:201912161902
10.10.10.233/develop/announcement-service:1.0.0-201911121013
10.10.10.233/develop/batch2-service:2.1.0-201912101825
10.10.10.233/develop/bizcardmanage-service:1.0.0-201910211755
10.10.10.233/develop/cart2-service:2.0.0-201911121022
10.10.10.233/develop/checkup2-service:2.1.0-201911111328
10.10.10.233/develop/cloud-web:1.0.0-201912181654
10.10.10.233/develop/comment-service:1.0.0-201909230900
10.10.10.233/develop/consumer-service:1.2.0-201911111333
10.10.10.233/develop/contract2-service:2.1.0-201912031522
10.10.10.233/develop/course-service:1.0.0-201911121026
10.10.10.233/develop/crm-service:8.2.0-201912121323
10.10.10.233/develop/document-service:1.0.0-201912111648
10.10.10.233/develop/employeemanage-service:1.1.0-201912161113
10.10.10.233/develop/employerarchive-service:1.1.0-201910251516
10.10.10.233/develop/files-service:1.0.0-201912181034
10.10.10.233/develop/finance-service:1.0.0-201912181634
10.10.10.233/develop/goods2-service:2.0.0-201912181432

然后使用下面的导出脚本，将上述所有镜像导出并打包为 docker-images.tar.gz：

#!/bin/bash
list="docker-images.txt"
images="docker-images.tar.gz"

usage () {
    echo "USAGE: $0 [--image-list docker-images.txt] [--images docker-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}

将导出的镜像拷到目标服务器后，执行下面的脚本进行导入：

#!/bin/bash
#注意修改下面的仓库地址
reg="10.10.1.5:10080"
lib="erp"
images="docker-images.tar.gz"
list="docker-images.txt"

usage () {
    echo "USAGE: $0 [--images docker-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"
}

while [[ $# -gt 0 ]]; do
    key="$1"
    case $key in
        -l|--image-list)
        list="$2"
        shift # past argument
        shift # past value
        ;;
        -i|--images)
        images="$2"
        shift # past argument
        shift # past value
        ;;
        -h|--help)
        help="true"
        shift
        ;;
        *)
        usage
        exit 1
        ;;
    esac
done

if [[ $help ]]; then
    usage
    exit 0
fi

docker load --input ${images}

load_images=()
while IFS= read -r i; do
    [ -z "${i}" ] && continue
    load_images+=("${i}");
done < "${list}"

for i in "${load_images[@]}"; do
    [ -z "${i}" ] && continue
	image_name="${reg}/${lib}/${i##*/}"
    docker tag "${i}" "${image_name}"
    docker push "${image_name}"
done

特别注意脚本中的 reg="10.10.1.5:10080" 改为要导入的镜像仓库地址。