Docker镜像的获取和推送

　　查找镜像

　　查找镜像的方法有主要有两种，一种是在Docker Hub官方网站查找，网址为https://hub.docker.com/

　　另一种方法是在命令行界面中通过docker serach <image>来查找相关的镜像。

　　docker search命令说明：

docker search [options] TERM
    --authomated=false    Only show automated builds
    --no-trunc=false    Don't truncate output
    -s,--stars=0    Only displays with at least x stars
    最多返回25个结果

　　docker search ubuntu结果：

[root@docker ~]# docker search ubuntu
NAME                       DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
ubuntu                     Ubuntu is a Debian-based Linux operating s...   6281      [OK]
rastasheep/ubuntu-sshd     Dockerized SSH service, built on top of of...   91                   [OK]
ubuntu-upstart             Upstart is an event-based replacement for ...   74        [OK]
neurodebian                NeuroDebian provides neuroscience research...   37        [OK]
ubuntu-debootstrap         debootstrap --variant=minbase --components...   30        [OK]
32bit/ubuntu               Ubuntu for i386 (32bit)                         30
armhf/ubuntu               Ubuntu is a Debian-based Linux operating s...   27
nuagebec/ubuntu            Simple always updated Ubuntu docker images...   22                   [OK]
tutum/ubuntu               Simple Ubuntu docker images with SSH access     18
ppc64le/ubuntu             Ubuntu is a Debian-based Linux operating s...   10
aarch64/ubuntu             Ubuntu is a Debian-based Linux operating s...   9
sameersbn/ubuntu                                                           9                    [OK]
i386/ubuntu                Ubuntu is a Debian-based Linux operating s...   7
nimmis/ubuntu              This is a docker images different LTS vers...   7                    [OK]
darksheer/ubuntu           Base Ubuntu Image -- Updated hourly             3                    [OK]
libmesos/ubuntu                                                            3
scaleway/ubuntu            Ubuntu image on Scaleway                        2
webhippie/ubuntu           Docker images for ubuntu                        1                    [OK]
vcatechnology/ubuntu       A Ubuntu image that is updated daily            1                    [OK]
s390x/ubuntu               Ubuntu is a Debian-based Linux operating s...   1
konstruktoid/ubuntu        Ubuntu base image                               0                    [OK]
smartentry/ubuntu          ubuntu with smartentry                          0                    [OK]
ossobv/ubuntu              Custom ubuntu image from scratch (based on...   0
defensative/socat-ubuntu                                                   0                    [OK]
pivotaldata/ubuntu         A quick freshening-up of the base Ubuntu d...   0
[root@docker ~]#

　　查找3星以上的ubuntu镜像：

[root@docker ~]# docker search -s 3 ubuntu
Flag --stars has been deprecated, use --filter=stars=3 instead
NAME                     DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
ubuntu                   Ubuntu is a Debian-based Linux operating s...   6281      [OK]
rastasheep/ubuntu-sshd   Dockerized SSH service, built on top of of...   91                   [OK]
ubuntu-upstart           Upstart is an event-based replacement for ...   74        [OK]
neurodebian              NeuroDebian provides neuroscience research...   37        [OK]
ubuntu-debootstrap       debootstrap --variant=minbase --components...   30        [OK]
32bit/ubuntu             Ubuntu for i386 (32bit)                         30
armhf/ubuntu             Ubuntu is a Debian-based Linux operating s...   27
nuagebec/ubuntu          Simple always updated Ubuntu docker images...   22                   [OK]
tutum/ubuntu             Simple Ubuntu docker images with SSH access     18
ppc64le/ubuntu           Ubuntu is a Debian-based Linux operating s...   10
aarch64/ubuntu           Ubuntu is a Debian-based Linux operating s...   9
sameersbn/ubuntu                                                         9                    [OK]
i386/ubuntu              Ubuntu is a Debian-based Linux operating s...   7
nimmis/ubuntu            This is a docker images different LTS vers...   7                    [OK]
darksheer/ubuntu         Base Ubuntu Image -- Updated hourly             3                    [OK]
libmesos/ubuntu                                                          3
[root@docker ~]#

　　拉取镜像

　　镜像通过"docker pull <image>"拉取。

　　docker pull命令简单说明：

docker pull [options] NAME[:TAG]
    -a,--all-tags=false    Download all tagged images in the repository

　　拉取ubuntu:14.04镜像：

[root@CentOS7 ~]# docker pull ubuntu:14.04
14.04: Pulling from library/ubuntu
cb56c90f0b30: Pull complete
0acc551e5716: Pull complete
8956dcd35143: Pull complete
908242721214: Pull complete
b44ff14dd3bb: Pull complete
Digest: sha256:5faf6cb681da2be979a177b60d8c18497f962e3d82268c49db6c74008d0c294d
Status: Downloaded newer image for ubuntu:14.04
[root@CentOS7 ~]#

　　拉取成功后可以通过docker images查看本地镜像：

[root@CentOS7 ~]# docker images
REPOSITORY                              TAG                 IMAGE ID            CREATED             SIZE
jie/df_test1                            latest              cd7c340503bc        3 hours ago         214MB
centos/nginx                            latest              e5faa74eeb5d        5 hours ago         401MB
php                                     latest              2dbd5ab1d9f5        4 days ago          370MB
nginx                                   latest              e4e6d42c70b3        5 days ago          107MB
centos                                  latest              36540f359ca3        11 days ago         193MB
registry                                latest              c2a449c9f834        2 weeks ago         33.2MB
mysql                                   latest              44a8e1a5c0b2        3 weeks ago         407MB
ubuntu                                  latest              d355ed3537e9        3 weeks ago         119MB
ubuntu                                  14.04               4a2820e686c4        3 weeks ago         188MB
daocloud.io/daocloud/daocloud-toolset   latest              bbdc71e950ea        4 months ago        147MB
[root@CentOS7 ~]#

　　由于国内的特殊原因，镜像拉取特别慢，很容易下载失败。所以我们可以使用加速器来加速下载，提高下载成功率，现有的比如网易蜂巢加速器、阿里云加速器和daocloud加速器等。可以根据自己喜好选用。

　　推送镜像（需要拥有Docker Hub的账号）

　　我们自己构建镜像之后可以通过docker push <image>将自己的镜像推送至Docker Hub仓库中，前提是需要有自己的Docker Hub账号。免费的账号只能有一个存储空间，当然Docker Hub支持付费服务，增加可用空间。

[root@docker ~]# docker push jie/df_test1
The push refers to a repository [docker.io/jie/df_test1]
sending image list
 
please login prior to push:
Username:staryjie
Password:
Email:fngje0128@163.com
Login Successed
The push refers to a repository [docker.io/jie/df_test1]
f5456bfd299d: Pushing
8f2ab3b3ad55: Waiting
0566c118947e: Preparing
6f9cf951edf5: Waiting
182d2a55830d: Preparing
5a4c2c9a24fc: Preparing
cb11ba605400: Waiting

　　等待push完成，上传完成之后即可在Docker Hub中自己的仓库中看到，也可以通过网页搜索查看，如果不想公开，也可以设置镜像为个人，这样别人就无法查看到你的镜像了。