docker search, pull, login, push with Docker Hub - public registry

docker HUB是一个公共的image registry, 不注册账号的话, 可以从docker hub下载public image.

docker search, pull操作不需要登录docker hub就可以对public image进行检索和下载.

如果需要将本地的image 推送到docker hub, 那么你需要注册一个docker hub的账号, 登录, 然后执行push即可.

docker hub的免费用户只能保存public image. 也就是说大家都能搜到并下载你的image.

例如 : 

登录docker hub

[root@db-172-16-3-221 ~]# docker login
Username: digoal
Password:
Email: xxx@xx.xx
Login Succeeded

登录后, 会把认证信息保存在.dockercfg文件中.

[root@db-172-16-3-221 ~]# cat ~/.dockercfg
{"https://index.docker.io/v1/":{"auth":"xxxxxxxxxxxx","email":"xxx@xx.xx"}}

查看当前正在运行的container, 例如我们这里有一个名为digoal的container.

[root@db-172-16-3-221 ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS               NAMES
ca64905e843a        postgres:9          /docker-entrypoint.s   3 hours ago         Up 3 hours          5432/tcp            digoal
aab6a732ddbc        postgres:9          /docker-entrypoint.s   20 hours ago        Up 20 hours         5432/tcp            happy_leakey
edae35acc741        postgres:9          /docker-entrypoint.s   20 hours ago        Up 20 hours         5432/tcp            lonely_mcclintock
7c99c4f4a01f        postgres:9          /docker-entrypoint.s   20 hours ago        Up 20 hours         5432/tcp            pensive_hoover
8238bc46c1da        postgres:9          /docker-entrypoint.s   20 hours ago        Up 20 hours         5432/tcp            grave_thompson     

我们把这个container打包成一个image, 把这个image放在digoal用户下.

[root@db-172-16-3-221 ~]# docker commit -a "digoal" -m "this is test" -p digoal digoal/postgres:9.3.5
a7ef5455170da413113de47917b3d4662e46d2835d69b28cfbe9aa919ff28804

查看本地的images, 就能看到刚才打包好的image: digoal/postgres:9.3.5

[root@db-172-16-3-221 ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
digoal/postgres     9.3.5               a7ef5455170d        7 seconds ago       212.9 MB
postgres            9.4-beta3           68b6ddf9ca08        8 days ago          213.6 MB
postgres            9.4                 68b6ddf9ca08        8 days ago          213.6 MB
postgres            9                   935836384c52        8 days ago          212.9 MB
postgres            latest              935836384c52        8 days ago          212.9 MB
postgres            9.3                 935836384c52        8 days ago          212.9 MB
postgres            9.3.5               935836384c52        8 days ago          212.9 MB
postgres            9.2.9               2a9ab0b9fa56        8 days ago          212.7 MB
postgres            9.2                 2a9ab0b9fa56        8 days ago          212.7 MB
postgres            9.1                 ee60947f6805        8 days ago          212.1 MB
postgres            9.1.14              ee60947f6805        8 days ago          212.1 MB
postgres            9.0.18              f29be88283f6        8 days ago          211.5 MB
postgres            9.0                 f29be88283f6        8 days ago          211.5 MB
postgres            8.4                 c57c14beb696        8 days ago          211 MB
postgres            8                   c57c14beb696        8 days ago          211 MB
postgres            8.4.22              c57c14beb696        8 days ago          211 MB
postgres            9.4-beta2           bf872395e1d4        2 weeks ago         213.6 MB

然后我们可以将这个image推送到docker hub. 同样是保存在我们登录的digoal用户下.

[root@db-172-16-3-221 ~]# docker push digoal/postgres:9.3.5
The push refers to a repository [digoal/postgres] (len: 1)
Sending image list
Pushing repository digoal/postgres (1 tags)
511136ea3c5a: Image already pushed, skipping
638fd9704285: Image already pushed, skipping
61f7f4f722fb: Image already pushed, skipping
759ce1ba8521: Image already pushed, skipping
05084fa93ca4: Image already pushed, skipping
b9c3e6ba73da: Image already pushed, skipping
e428b525362f: Image already pushed, skipping
74b9c5a96fe2: Image already pushed, skipping
a40cbed3d918: Image already pushed, skipping
adac4c321716: Image already pushed, skipping
c7dac22233f3: Image already pushed, skipping
b95ec4ff2ae8: Image already pushed, skipping
6d9ec1cd8a6f: Image already pushed, skipping
0778b2e9be29: Image already pushed, skipping
1a351aafeb1c: Image already pushed, skipping
789b1440f38b: Image already pushed, skipping
e849841ed55f: Image already pushed, skipping
ee9cafa51046: Image already pushed, skipping
15d042248df3: Image already pushed, skipping
935836384c52: Image already pushed, skipping
a7ef5455170d: Image successfully pushed
Pushing tag for rev [a7ef5455170d] on {https://cdn-registry-1.docker.io/v1/repositories/digoal/postgres/tags/9.3.5}

现在执行search可以检索到我们刚才提交的image.

[root@db-172-16-3-221 ~]# docker search digoal
NAME              DESCRIPTION   STARS     OFFICIAL   AUTOMATED
digoal/postgres                 0         

[参考]

1. https://docs.docker.com/userguide/dockerrepos/