K8S学习笔记之将Google的gcr.io、k8s.gcr.io 换为国内镜像

0x00 添加docker官方的国内镜像

sudo tee /etc/docker/daemon.json <<-'EOF'

{

  "registry-mirrors": ["https://registry.docker-cn.co"]

}

EOF

0x01 gcr.io镜像转换为国内镜像

根据开源项目：

https://github.com/anjia0532/gcr.io_mirror

作者将gcr.io相关镜像pull下来，然后push到docker官方仓库，相关转换语法如下：

使用语法

# 一般语法

gcr.io/namespace/image_name:image_tag <====> anjia0532/namespace.image_name:image_tag

# 特别语法

k8s.gcr.io/{image}/{tag} <==> gcr.io/google-containers/{image}/{tag} <==> anjia0532/google-containers.{image}/{tag}

批量转换脚本

# replace gcr.io/google-containers/federation-controller-manager-arm64:v1.3.1-beta.1 to real image

# this will convert gcr.io/google-containers/federation-controller-manager-arm64:v1.3.1-beta.1

# to anjia0532/google-containers.federation-controller-manager-arm64:v1.3.1-beta.1 and pull it

# k8s.gcr.io/{image}/{tag} <==> gcr.io/google-containers/{image}/{tag} <==> anjia0532/google-containers.{image}/{tag}

images=$(cat img.txt)

#or

#images=$(cat <<EOF

# gcr.io/google-containers/federation-controller-manager-arm64:v1.3.1-beta.1

# gcr.io/google-containers/federation-controller-manager-arm64:v1.3.1-beta.1

# gcr.io/google-containers/federation-controller-manager-arm64:v1.3.1-beta.1

#EOF

#)

eval $(echo ${images}|

        sed 's/k8s\.gcr\.io/anjia0532\/google-containers/g;s/gcr\.io/anjia0532/g;s/\//\./g;s/ /\n/g;s/anjia0532\./anjia0532\//g' |

        uniq |

        awk '{print "docker pull "$1";"}'

       )

# this code will retag all of anjia0532's image from local  e.g. anjia0532/google-containers.federation-controller-manager-arm64:v1.3.1-beta.1

# to gcr.io/google-containers/federation-controller-manager-arm64:v1.3.1-beta.1

# k8s.gcr.io/{image}/{tag} <==> gcr.io/google-containers/{image}/{tag} <==> anjia0532/google-containers.{image}/{tag}

for img in $(docker images --format "{{.Repository}}:{{.Tag}}"| grep "anjia0532"); do

  n=$(echo ${img}| awk -F'[/.:]' '{printf "gcr.io/%s",$2}')

  image=$(echo ${img}| awk -F'[/.:]' '{printf "/%s",$3}')

  tag=$(echo ${img}| awk -F'[:]' '{printf ":%s",$2}')

  docker tag $img "${n}${image}${tag}"

  [[ ${n} == "gcr.io/google-containers" ]] && docker tag $img "k8s.gcr.io${image}${tag}"

done

0x02 pull-google-container 工具脚本

K8S的exapmle里的yaml默认是k8s.gcr.io的镜像，为了方便运行我们可以预先拉取相关镜像：

pull-google脚本

# vim pull-google.sh

  image=$1

  echo $1

  img=`echo $image | sed 's/k8s\.gcr\.io/anjia0532\/google-containers/g;s/gcr\.io/anjia0532/g;s/\//\./g;s/ /\n/g;s/_/-/g;s/anjia0532\./anjia0532\//g' | uniq | awk '{print ""$1""}'`

  echo "docker pull $img"

  docker pull $img

  echo  "docker tag $img $image"

  docker tag $img $image

~

然后放到/usr/local/bin

# chmod +x pull-google.sh && cp pull-google.sh /usr/local/bin/pull-google-container

就可以愉快的使用pull-google-container 命令了

pull-google-container gcr.io/google-samples/gb-frontend:v4

gcr.io/google-samples/gb-frontend:v4

# 转换pull源头到anjia0532

docker pull anjia0532/google-samples.gb-frontend:v4

v4: Pulling from anjia0532/google-samples.gb-frontend

Digest: sha256:aaa5b327ef3b4cb705513ab674fa40df66981616950c7de4912a621f9ee03dd4

Status: Image is up to date for anjia0532/google-samples.gb-frontend:v4

# 将anjia0532的镜像打tag

docker tag anjia0532/google-samples.gb-frontend:v4 gcr.io/google-samples/gb-frontend:v4

0x03 利用替换已有的yaml的方法

除了预先拉取镜像，我们还可以将k8s.gcr.io 替换为可执行镜像
为了方便替换，我们编写一个repair_yaml 脚本：

# vim /usr/local/bin/repair_yaml

  cp $1 "$1.bak"

  cat $1.bak | sed 's/k8s\.gcr\.io\//anjia0532\/google-containers./g;s/gcr\.io\/\(.*\)\//anjia0532\/\1./g;s/google_/google-/g;' > $1

  rm -f "$1.bak"

保存退出，然后

# chmod +x /usr/local/bin/repair_yaml

效果：

$ repair_yaml frontend-deployment.yaml

$ cat frontend-deployment.yaml

apiVersion: apps/v1 #  for k8s versions before 1.9.0 use apps/v1beta2  and before 1.8.0 use extensions/v1beta1

kind: Deployment

metadata:

  name: frontend

spec:

  selector:

    matchLabels:

      app: guestbook

      tier: frontend

  replicas: 3

  template:

    metadata:

      labels:

        app: guestbook

        tier: frontend

    spec:

      # 更换镜像源

      containers:

      - name: php-redis

        image: anjia0532/google-samples.gb-frontend:v4

        resources:

          requests:

            cpu: 100m

            memory: 100Mi

        env:

        - name: GET_HOSTS_FROM

          value: dns

          # If your cluster config does not include a dns service, then to

          # instead access environment variables to find service host

          # info, comment out the 'value: dns' line above, and uncomment the

          # line below:

          # value: env

        ports:

        - containerPort: 80

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