1. 镜像转存需求

因K8S镜像在不开代理的情况下，拉取超时、下载缓慢，导致镜像拉取不下来。现在通过在线交互学习平台，进行拉取，后转存到docker私有仓库，再进行拉取，可以解决镜像拉取、下载失败等问题。

2. 注册并登陆 killercoda URL

注册URL：Killercoda Interactive Environments

• 选择登陆方式

• 输入邮箱地址

• 前往邮件后台，查收邮件。

• 点击click here to login。

• 授权等待中…

• 注册登陆完成。

3. 打开playground

4. 在线拉取K8S镜像并打上标签

controlplane $ docker pull k8s.gcr.io/autoscaling/vpa-admission-controller:0.13.0
0.13.0: Pulling from autoscaling/vpa-admission-controller
fc251a6e7981: Pull complete 
da7e855a5a9b: Pull complete 
Digest: sha256:c857dcbfc071bcdd25bd9835955eda2c05e8846f638d0556475e4b40f2fbd294
Status: Downloaded newer image for k8s.gcr.io/autoscaling/vpa-admission-controller:0.13.0
k8s.gcr.io/autoscaling/vpa-admission-controller:0.13.0

controlplane $ docker images
REPOSITORY                                        TAG       IMAGE ID       CREATED         SIZE
k8s.gcr.io/autoscaling/vpa-admission-controller   0.13.0    b285911b0ebb   13 months ago   53.9MB
xybdiy/vpa-admission-controller                   0.12.0    f4325d883003   18 months ago   53.9MB
k8s.gcr.io/autoscaling/vpa-admission-controller   0.12.0    f4325d883003   18 months ago   53.9MB

controlplane $ docker tag k8s.gcr.io/autoscaling/vpa-admission-controller:0.13.0 xybdiy/vpa-admission-controller:0.13.0
controlplane $ 

controlplane $ docker images
REPOSITORY                                        TAG       IMAGE ID       CREATED         SIZE
xybdiy/vpa-admission-controller                   0.13.0    b285911b0ebb   13 months ago   53.9MB
k8s.gcr.io/autoscaling/vpa-admission-controller   0.13.0    b285911b0ebb   13 months ago   53.9MB
k8s.gcr.io/autoscaling/vpa-admission-controller   0.12.0    f4325d883003   18 months ago   53.9MB
xybdiy/vpa-admission-controller                   0.12.0    f4325d883003   18 months ago   53.9MB
controlplane $ 

5. 推送K8S镜像到Docker私有仓库

controlplane $ docker login
Authenticating with existing credentials...
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
controlplane $ docker push xybdiy/vpa-admission-controller:0.13.0
The push refers to repository [docker.io/xybdiy/vpa-admission-controller]
3fe018b48e98: Pushed 
cb60fb9b862c: Pushed 
0.13.0: digest: sha256:28b0ca918c58debf94334c56404223490c475daa2abb2d91bdfc15533ca8df5e size: 739

6. 登陆Docker私有仓库查看

URL：https://hub.docker.com/