使用docker的login命令之後，可以使用push命令將映象推送到dockerhub上，但是dockerhub畢竟在公網上，免費的帳戶只有一個private 的repository是免費的，剩下的就都只能做成public的。由於種種限制，企業私有倉庫的建立就有了各種應用場景。本文將從使用registry的方式簡單介紹如何搭建私有的repository.

pull registry映象

使用到的registry映象

[[email protected] ~]# docker search registry |head -n2
NAME                                      DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
registry                                  Containerized docker registry                   1123
 
      [OK]
[[email protected] ~]# 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
[[email protected] ~]#

docker run建立私有倉庫

registry的介紹提到的最佳實踐建議將registry作為容器執行起來。

[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 ~]#

向私有倉庫push一個映象

準備：pull一個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 ~]#

準備：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推送到私有倉庫

[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 ~]#

結果確認

[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 ~]#

從私庫中pull映象

事前準備：將其他映象都刪除，以便確認該映象確實是從私有倉庫中pull出來的

[root@liumiaocn ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
registry            latest              541a6732eadb        3 weeks ago         33.27 MB
[root@liumiaocn ~]# 

pull 私庫映象

[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 ~]#

確認：
pull下來的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可以用來建立私有倉庫，但是其使用者管理/圖形介面等等方面的功能幾乎沒有，很不友好， 之前我們也介紹過habor，habor也是建立在registry基礎之上的，在接下來的文章中我們會介紹一下如何使用habor。