Docker-06推送push和拉取pull镜像

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官方文档:https://docs.docker.com/engine/getstarted/step_six/

推送本地镜像到Docker Hub上你的镜像库中，然后再镜像从镜像库中拉取到本地，并运行它。

推送镜像到镜像库

查看本地所有镜像

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker images 
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker-whale        latest              efb18db73358        About an hour ago   275 MB
hello-world         latest              48b5124b2768        5 weeks ago         1.84 kB
docker/whalesay     latest              6b362a9f73eb        21 months ago       247 MB

找到镜像ID

以docker-whale镜像为例，它的镜像ID是efb18db73358

现在, docker-whale镜像还没有命名空间， 你需要关联一个命名空间， 命名空间就是你的Docker Hub账户名（我的是kangyonggan, 然后给镜像名添加命名空间，比如: kangyonggan/docker-whale

用docker tag命令给镜像添加标签（命名空间）

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker tag efb18db73358 kangyonggan/docker-whale:latest

4. 再次运行docker images会发现镜像已经有了标签

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker images 
REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE
docker-whale               latest              efb18db73358        About an hour ago   275 MB
kangyonggan/docker-whale   latest              efb18db73358        About an hour ago   275 MB
hello-world                latest              48b5124b2768        5 weeks ago         1.84 kB
docker/whalesay            latest              6b362a9f73eb        21 months ago       247 MB

还会发现，相同的镜像ID存在于两个不同的镜像库。

登录Docker Hub

在最终把镜像推送到Docker Hub上之前，你需要登录Docker Hub。

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker login 
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: kangyonggan
Password: 
Login Succeeded

把镜像推送到自己的Docker Hub上

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker push kangyonggan/docker-whale
The push refers to a repository [docker.io/kangyonggan/docker-whale]
4d8b662d1a5a: Pushing [========>                                          ] 5.001 MB/28.13 MB
5f70bf18a086: Mounted from docker/whalesay 
d061ee1340ec: Mounted from docker/whalesay 
d511ed9e12e1: Mounted from docker/whalesay 
091abc5148e4: Mounted from docker/whalesay 
b26122d57afa: Mounted from docker/whalesay 
37ee47034d9b: Mounted from docker/whalesay 
528c8710fd95: Mounted from docker/whalesay 
1154ba695078: Mounted from docker/whalesay

网速有点慢(目测要翻墙才能快)，才推送了5/28M。

登录Docker Hub查看新推送的镜像

由于网速太慢（怀疑是官网太慢），截图的时候还没推送完成。

从镜像库拉取镜像

docker pull是用来拉取镜像的，如果本地已经有最新版的镜像，docker pull命令将什么也不做，为了验证是真正的从镜像库中拉取下来的，你可以先删除本地镜像docker image remove。

用docker image remove删除本地镜像

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker images 
REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE
docker-whale2              latest              efb18db73358        2 hours ago         275 MB
docker-whale               latest              efb18db73358        2 hours ago         275 MB
kangyonggan/docker-whale   latest              efb18db73358        2 hours ago         275 MB
hello-world                latest              48b5124b2768        5 weeks ago         1.84 kB
docker/whalesay            latest              6b362a9f73eb        21 months ago       247 MB

root@iZ23ldh8kudZ:~/code/mydockerbuild# docker image remove efb18db73358
Error response from daemon: conflict: unable to delete efb18db73358 (must be forced) - image is referenced in multiple repositories

通过镜像ID删除一个本地镜像，可能会报错，如果此时你又两个ID一样的镜像，另外也可以通过镜像标签删除镜像。

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker image remove docker-whale2
Untagged: docker-whale2:latest

root@iZ23ldh8kudZ:~/code/mydockerbuild# docker images 
REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE
docker-whale               latest              efb18db73358        2 hours ago         275 MB
kangyonggan/docker-whale   latest              efb18db73358        2 hours ago         275 MB
hello-world                latest              48b5124b2768        5 weeks ago         1.84 kB
docker/whalesay            latest              6b362a9f73eb        21 months ago       247 MB

用docker run命令从Docker Hub拉取镜像，当你本地没这个镜像的时候。

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root@iZ23ldh8kudZ:~/code/mydockerbuild# docker run kangyonggan/docker-whale

更多用法请移步:https://docs.docker.com/engine/getstarted/last_page/