前期准备
一、背景介绍
由于国内网络原因，gcr.io 仓库里的镜像是无法直接拉取到的，这给开发工作造成了极大的不便
本文介绍一种方法能够实现自动化地定期地将 gcr.io 仓库中的镜像同步到个人 DockerHub 账户
实现该方案需要满足以下条件：
已注册 GitHub 账号 https://github.com/
已注册 DockerHub 账号 https://hub.docker.com
已注册 Google Cloud 账号 https://cloud.google.com/
已注册 Travis CI 账号 https://www.travis-ci.org/
二、实现步骤
一、Google Cloud 服务账户，以读取 gcr.io 仓库中的镜像列表 生成json文件 保存文件备用
登录 Google Cloud 控制台，点击菜单 “IAM和管理” -> “服务账号”
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填入 “账号名称” 和 “账号ID”，点击 “创建”，之后授予权限，角色选择 “容器分析备注查看者”，点击 “继续”
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点击 “创建密钥”
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推荐JSON格式
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二、DockerHub 登录密钥文件 保存文件备用
DockerHub Login 登录，在家目录.docker目录下生成config.json
Docker login
Docker
三、创建 SSH 密钥，并在 GitHub 上进行授权 id_rsa文件保存备用
这部分省略，自行查询
四、创建 GitHub 项目，配置 Travis CI 策略
GitHub 项目名称 https://github.com/JaeGerW2016/mirrorgcrio
#拉取github项目到本地
git clone https://github.com/JaeGerW2016/mirrorgcrio.git
cd mirrorgcrio
touch .travis.yml
#将之前生成的 gcloud.config.json、config.json、id_rsa 放置到项目根目录
tar czvf config.tar.gz gcloud.config.json config.json id_rsa
#docker 拉取一个travis-ci镜像生成加密文件
docker run -it -v /opt/travis-ci/mirrorgcrio:/root shidaqiu/travis-cli
travis login
#登录成功后，在容器执行操作
travis encrypt-file config.tar.gz --add
#退出容器，由于/opt/travis-ci/mirrorgcrio挂载到容器做持久化，会在根目录下生成config.tar.gz.enc
mv config.tar.gz.enc .travis
#防止后期git push到github上
rm -f config.tar.gz gcloud.config.json config.json id_rsa
编辑.travis.yml
sudo: required
language: python
python:
- '2.7'
addons:
apt:
packages:
- docker-ce
branches:
only:
- master
install:
- git remote -v
script:
- "./get_image.sh"
before_install:
- export start_time=$(date +%s)
- mkdir -p ~/.docker
- mkdir -p ~/.ssh
#替换自己的加密文件
- openssl aes-256-cbc -K $encrypted_1fc90f464345_key -iv $encrypted_1fc90f464345_iv
-in .travis/config.tar.gz.enc -out ~/config.tar.gz -d
- tar xf ~/config.tar.gz -C ~
- mv ~/id_rsa ~/.ssh/id_rsa
- mv ~/config.json ~/.docker/config.json
- chmod 600 ~/.ssh/id_rsa
- chmod 600 ~/.docker/config.json
- eval $(ssh-agent)
- ssh-add ~/.ssh/id_rsa
编辑get_image.sh
#!/bin/bash
GCR_NAMESPACE=gcr.io/google-containers
#自行替换自己的Dockerhub
DOCKERHUB_NAMESPACE=mirrorgcrio
today(){
date +%F
}
git_init(){
git config --global user.name "xxxx"
git config --global user.email xxxx@qq.com
git remote rm origin
git remote add origin git@github.com:JaeGerW2016/mirrorgcrio.git
git pull
if git branch -a |grep 'origin/develop' &> /dev/null ;then
git checkout develop
git pull origin develop
git branch --set-upstream-to=origin/develop develop
else
git checkout -b develop
git pull origin develop
fi
}
git_commit(){
local COMMIT_FILES_COUNT=$(git status -s|wc -l)
local TODAY=$(today)
if [ $COMMIT_FILES_COUNT -ne 0 ];then
git add -A
git commit -m "Synchronizing completion at $TODAY"
git push -u origin develop
fi
}
add_yum_repo() {
cat > /etc/yum.repos.d/google-cloud-sdk.repo <<EOF
[google-cloud-sdk]
name=Google Cloud SDK
baseurl=https://packages.cloud.google.com/yum/repos/cloud-sdk-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg
https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
}
add_apt_source(){
export CLOUD_SDK_REPO="cloud-sdk-$(lsb_release -c -s)"
echo "deb http://packages.cloud.google.com/apt $CLOUD_SDK_REPO main" | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
}
install_sdk() {
local OS_VERSION=$(grep -Po '(?<=^ID=")\w+' /etc/os-release)
local OS_VERSION=${OS_VERSION:-ubuntu}
if [[ $OS_VERSION =~ "centos" ]];then
if ! [ -f /etc/yum.repos.d/google-cloud-sdk.repo ];then
add_yum_repo
yum -y install google-cloud-sdk
else
echo "gcloud is installed"
fi
elif [[ $OS_VERSION =~ "ubuntu" ]];then
if ! [ -f /etc/apt/sources.list.d/google-cloud-sdk.list ];then
add_apt_source
sudo apt-get -y update && sudo apt-get -y install google-cloud-sdk
else
echo "gcloud is installed"
fi
fi
}
auth_sdk(){
local AUTH_COUNT=$(gcloud auth list --format="get(account)"|wc -l)
if [ $AUTH_COUNT -eq 0 ];then
gcloud auth activate-service-account --key-file=$HOME/gcloud.config.json
else
echo "gcloud service account is exsits"
fi
}
repository_list() {
if ! [ -f repo_list.txt ];then
gcloud container images list --repository=${GCR_NAMESPACE} --format="value(NAME)" > repo_list.txt && \
echo "get repository list done"
else
/bin/mv -f repo_list.txt old_repo_list.txt
gcloud container images list --repository=${GCR_NAMESPACE} --format="value(NAME)" > repo_list.txt && \
echo "get repository list done"
DEL_REPO=($(diff -B -c old_repo_list.txt repo_list.txt |grep -Po '(?<=^\- ).+|xargs')) && \
rm -f old_repo_list.txt
if [ ${#DEL_REPO} -ne 0 ];then
for i in ${DEL_REPO[@]};do
rm -rf ${i##*/}
done
fi
fi
}
generate_changelog(){
if ! [ -f CHANGELOG.md ];then
echo >> CHANGELOG.md
fi
}
push_image(){
GCR_IMAGE=$1
DOCKERHUB_IMAGE=$2
docker pull ${GCR_IMAGE}
docker tag ${GCR_IMAGE} ${DOCKERHUB_IMAGE}
docker push ${DOCKERHUB_IMAGE}
echo "$IMAGE_TAG_SHA" > ${IMAGE_NAME}/${i}
sed -i "1i\- ${DOCKERHUB_IMAGE}" CHANGELOG.md
}
clean_images(){
IMAGES_COUNT=$(docker image ls|wc -l)
if [ $IMAGES_COUNT -gt 1 ];then
docker image prune -a -f
fi
}
clean_disk(){
DODCKER_ROOT_DIR=$(docker info --format '{{json .}}'|jq -r '.DockerRootDir')
USAGE=$(df $DODCKER_ROOT_DIR|awk -F '[ %]+' 'NR>1{print $5}')
if [ $USAGE -eq 80 ];then
wait
clean_images
fi
}
main() {
git_init
install_sdk
auth_sdk
repository_list
generate_changelog
TODAY=$(today)
PROGRESS_COUNT=0
LINE_NUM=0
LAST_REPOSITORY=$(tail -n 1 repo_list.txt)
while read GCR_IMAGE_NAME;do
let LINE_NUM++
IMAGE_INFO_JSON=$(gcloud container images list-tags $GCR_IMAGE_NAME --filter="tags:*" --format=json)
TAG_INFO_JSON=$(echo "$IMAGE_INFO_JSON"|jq '.[]|{ tag: .tags[] ,digest: .digest }')
TAG_LIST=($(echo "$TAG_INFO_JSON"|jq -r .tag))
IMAGE_NAME=${GCR_IMAGE_NAME##*/}
if [ -f breakpoint.txt ];then
SAVE_DAY=$(head -n 1 breakpoint.txt)
if [[ $SAVE_DAY != $TODAY ]];then
:> breakpoint.txt
else
BREAK_LINE=$(tail -n 1 breakpoint.txt)
if [ $LINE_NUM -lt $BREAK_LINE ];then
continue
fi
fi
fi
for i in ${TAG_LIST[@]};do
GCR_IMAGE=${GCR_IMAGE_NAME}:${i}
DOCKERHUB_IMAGE=${DOCKERHUB_NAMESPACE}/${IMAGE_NAME}:${i}
IMAGE_TAG_SHA=$(echo "${TAG_INFO_JSON}"|jq -r "select(.tag == \"$i\")|.digest")
if [[ $GCR_IMAGE_NAME == $LAST_REPOSITORY ]];then
LAST_TAG=${TAG_LIST[-1]}
LAST_IMAGE=${LAST_REPOSITORY}:${LAST_TAG}
if [[ $GCR_IMAGE == $LAST_IMAGE ]];then
wait
clean_images
fi
fi
if [ -f $IMAGE_NAME/$i ];then
echo "$IMAGE_TAG_SHA" > /tmp/diff.txt
if ! diff /tmp/diff.txt $IMAGE_NAME/$i &> /dev/null ;then
clean_disk
push_image $GCR_IMAGE $DOCKERHUB_IMAGE &
let PROGRESS_COUNT++
fi
else
mkdir -p $IMAGE_NAME
clean_disk
push_image $GCR_IMAGE $DOCKERHUB_IMAGE &
let PROGRESS_COUNT++
fi
COUNT_WAIT=$[$PROGRESS_COUNT%50]
if [ $COUNT_WAIT -eq 0 ];then
wait
clean_images
git_commit
fi
done
if [ $COUNT_WAIT -eq 0 ];then
wait
clean_images
git_commit
fi
echo "sync image $MY_REPO/$IMAGE_NAME done."
echo -e "$TODAY\n$LINE_NUM" > breakpoint.txt
done < repo_list.txt
sed -i "1i-------------------------------at $(date +'%F %T') sync image repositorys-------------------------------" CHANGELOG.md
git_commit
}
main
设置travis
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设置cronjob
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手动触发构建
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查看job Log
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最终验证是否同步到DockeHub https://hub.docker.com/u/mirrorgcrio/?page=1
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用法：
docker pull gcr.io/google-containers/federation-controller-manager-arm64:v1.3.1-beta.1
# eq
docker pull mirrorgcrio/federation-controller-manager-arm64:v1.3.1-beta.1
