使用docker的login命令之后，可以使用push命令将镜像推送到dockerhub上，但是dockerhub毕竟在公网上，免费的帐户只有一个private 的repository是免费的，剩下的就都只能做成public的。由于种种限制，企业私有仓库的创建就有了各种应用场景。本文将从使用registry的方式简单介绍如何搭建私有的repository.
pull registry镜像
使用到的registry镜像
[root@liumiaocn ~]# docker search registry |head -n2
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
registry Containerized docker registry 1123 [OK]
[root@liumiaocn ~]# docker pull registry
Using default tag: latest
latest: Pulling from library/registry
c0cb142e4345: Pull complete
a5002dfce871: Pull complete
df53ce740974: Pull complete
9ce080a7bfae: Pull complete
517dc3530502: Pull complete
Digest: sha256:1cfcd718fd8a49fec9ef16496940b962e30e3927012e851f99905db55f1f4199
Status: Downloaded newer image for registry:latest
[root@liumiaocn ~]#docker run创建私有仓库
registry的介绍提到的最佳实践建议将registry作为容器运行起来。
[root@liumiaocn ~]# docker run -d -p 5000:5000 registry
badf822f34751979e4f7fc513b40177f941b227c7385245ad2f391737587b117
[root@liumiaocn ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
badf822f3475 registry "/entrypoint.sh /etc/" 3 seconds ago Up 2 seconds 0.0.0.0:5000->5000/tcp sharp_khorana
[root@liumiaocn ~]#向私有仓库push一个镜像
准备：pull一个busybox
[root@liumiaocn ~]# docker pull busybox
Using default tag: latest
latest: Pulling from library/busybox
56bec22e3559: Pull complete
Digest: sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912
Status: Downloaded newer image for busybox:latest
[root@liumiaocn ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
busybox latest e02e811dd08f 9 days ago 1.093 MB
registry latest 541a6732eadb 3 weeks ago 33.27 MB
[root@liumiaocn ~]#准备：tag busybox
[root@liumiaocn ~]# docker tag busybox localhost:5000/busybox
[root@liumiaocn ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
busybox latest e02e811dd08f 9 days ago 1.093 MB
localhost:5000/busybox latest e02e811dd08f 9 days ago 1.093 MB
registry latest 541a6732eadb 3 weeks ago 33.27 MB
[root@liumiaocn ~]#push推送到私有仓库
[root@liumiaocn ~]# docker push localhost:5000/busybox
The push refers to a repository [localhost:5000/busybox]
e88b3f82283b: Pushed
latest: digest: sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912 size: 527
[root@liumiaocn ~]#结果确认
[root@liumiaocn ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
busybox latest e02e811dd08f 9 days ago 1.093 MB
localhost:5000/busybox latest e02e811dd08f 9 days ago 1.093 MB
registry latest 541a6732eadb 3 weeks ago 33.27 MB
[root@liumiaocn ~]#从私库中pull镜像
事前准备：将其他镜像都删除，以便确认该镜像确实是从私有仓库中pull出来的
[root@liumiaocn ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
registry latest 541a6732eadb 3 weeks ago 33.27 MB
[root@liumiaocn ~]# pull 私库镜像
[root@liumiaocn ~]# docker pull localhost:5000/busybox
Using default tag: latest
latest: Pulling from busybox
56bec22e3559: Pull complete
Digest: sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912
Status: Downloaded newer image for localhost:5000/busybox:latest
[root@liumiaocn ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
localhost:5000/busybox latest e02e811dd08f 9 days ago 1.093 MB
registry latest 541a6732eadb 3 weeks ago 33.27 MB
[root@liumiaocn ~]#确认：
pull下来的image可以正常使用
[root@liumiaocn ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
localhost:5000/busybox latest e02e811dd08f 9 days ago 1.093 MB
registry latest 541a6732eadb 3 weeks ago 33.27 MB
[root@liumiaocn ~]# docker run -it localhost:5000/busybox /bin/sh
/ # hostname
24976e98919e
/ #registry可以用来创建私有仓库，但是其用户管理/图形界面等等方面的功能几乎没有，很不友好， 之前我们也介绍过habor，habor也是建立在registry基础之上的，在接下来的文章中我们会介绍一下如何使用habor。