Notes

Pull a local image to run a pod in Kubernetes
From <https://stackoverflow.com/questions/40144138/pull-a-local-image-to-run-a-pod-in-kubernetes/40150867#40150867>
让k8s从本地镜像仓库拉取镜像
From <https://0xffff.one/d/618>

1) Start a local registry container(registry 1已经过期)
• docker run -d -p 5000:5000 --restart=always --name registry registry:2
检查是否运行成功，运行后浏览器出现 {}
• http://localhost:5000/v2/

2) Do docker images to find out the REPOSITORY and TAG of your local image. Then create a new tag for your local image :
• docker tag <local-image-repository>:<local-image-tag> localhost:5000/<local-image-name>
• docker tag artifactory.ap.manulife.com/docker/sg/rsf-aks-client-gongping:1.0-SNAPSHOT localhost:5000/rsf-aks-client-gongping:1.0-SNAPSHOT

公司可能网络设置不让从本地库pull image，所以总会出现ImagePullBackOff或ImagePullErr，can't pull image等错误，但不妨碍从hub.docker.com中拉取。办法是先将image推送到hub.docker.com中自己的repository为beyondream。
docker tag artifactory.ap.manulife.com/docker/sg/rsf-aks-client-gongping:1.0-SNAPSHOT beyondream/rsf-aks-client-gongping:1.1-SNAPSHOT

docker push beyondream/rsf-aks-client-gongping:1.1-SNAPSHOT

kubectl create -f .deployment.yaml

kubectl port-forward dep-rsf-aks-client-gongping-b869f4cd-t8xjb 8080:8080
Forwarding from 127.0.0.1:8080 -> 8080


If TAG for your local image is <none>, you can simply do:
• docker tag <local-image-repository> localhost:5000/<local-image-name>

3) Push to local registry :
• docker push localhost:5000/<local-image-name>
docker push localhost:5000/rsf-aks-client-gongping:1.0-SNAPSHOT

This will automatically add the latest tag to localhost:5000/<local-image-name>. You can check again by doing docker images.

检查镜像是否推成功(先删除本地镜像，再从仓库拉取运行)：
• docker rmi localhost:5000/rsf-aks-client-gongping:1.0-SNAPSHOT
• docker run --name rsf-aks-client-gongping -p 8080:8080 -i -t --rm localhost:5000/rsf-aks-client-gongping:1.0-SNAPSHOT

4) In your yaml file, set imagePullPolicy to IfNotPresent :
...
spec:
containers:
- name: <name>
image: localhost:5000/<local-image-name>
imagePullPolicy: IfNotPresent
...
That's it. Now your ImagePullError should be resolved.


k8s的配置文件中经常看到有imagePullPolicy属性，这个属性是描述镜像的拉取策略

Always 总是拉取镜像
IfNotPresent 本地有则使用本地镜像,不拉取
Never 只使用本地镜像，从不拉取，即使本地没有
如果省略imagePullPolicy 镜像tag为 :latest 策略为always ，否则 策略为 IfNotPresent

原文链接：https://blog.csdn.net/shenghuiping2001/article/details/103600053


存出和载入镜像
https://wiki.jikexueyuan.com/project/docker-technology-and-combat/save_load.html>
存出镜像
如果要导出镜像到本地文件，可以使用 docker save 命令。
$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
ubuntu 14.04 c4ff7513909d 5 weeks ago 225.4 MB
...
$sudo docker save -o ubuntu_14.04.tar ubuntu:14.04
载入镜像
可以使用 docker load 从导出的本地文件中再导入到本地镜像库，例如
$ sudo docker load --input ubuntu_14.04.tar
或
$ sudo docker load < ubuntu_14.04.tar