Docker支持采用仓库（本处指的是registry）来支持镜像的分发和更新管理。这极大的便利了用户。
官方提供了dockerhub网站来作为一个公开的集中仓库。然而，本地访问dockerhub速度往往很慢，并且很多时候我们需要一个本地的私有仓库只供网内使用。
关于如何创建和使用本地仓库，其实已经有很多文章介绍了。但是这些文章要么内容已经过时，要么给出了错误的配置，导致无法正常创建仓库。 本文以CoreOS系统为基础，讲解如何通过register镜像创建一个本地Repo
1 使用registry启动私有仓库的容器
docker run -d -p 5000:5000 -v /root/my_registry:/tmp/registry registry
说明：若之前没有安装registry容器则会自动下载并启动一个registry容器，创建本地的私有仓库服务。默认情况下，会将仓库创建在容器的/tmp/registry目录下，可以通过 -v 参数来将镜像文件存放在本地的指定路径上（例如，放在本地目录/root/my_registry下）。
2 向私有仓库push镜像
启动完register的镜像后，将register镜像上传到本地仓库上作为测试
说明：根据第一步启动的registry容器所在宿主主机的IP和Port，push某环境的本地容器。
localhost images # docker push 10.0.0.142:5000/register
The push refers to a repository [10.0.0.142:5000/register] (len: 1)
Sending image list
Pushing repository 10.0.0.142:5000/register (1 tags)
e9e06b06e14c: Image successfully pushed
a82efea989f9: Image successfully pushed
37bea4ee0c81: Image successfully pushed
07f8e8c5e660: Image successfully pushed
1f4ab7282e19: Image successfully pushed
0e4483abe66b: Image successfully pushed
c6153b5d8f1f: Image successfully pushed
2bc4611f2ed7: Image successfully pushed
30887473610f: Image successfully pushed
3f8e22c413b1: Image successfully pushed
22b1c756fa19: Image successfully pushed
90607d8d09d1: Image successfully pushed
4f4a5acb19eb: Image successfully pushed
204704ce3137: Image successfully pushed
Pushing tag for rev [204704ce3137] on {:5000/v1/repositories/register/tags/latest}
宿主主机my_registry的目录结构
localhost my_registry # ls -R
.:
images repositories
./images:
07f8e8c5e66084bef8f848877857537ffe1c47edd01a93af27e7161672ad0e95 2bc4611f2ed7611f46c4aaee05e34b7a490671c79c41b827dc168377da95b041 90607d8d09d11e65ed8f4e4f5b20d99ecc1db1539b7c96ef28884dcebb1cbee6
0e4483abe66bcc57ffe504a9baf65432f4931e5f91da3d5257e9990580d4beb0 30887473610f3f9354a34931cc43b8dd744d93375d6d95704d45313f843008dd a82efea989f94b1d9fac76e26e37b0bbde11047a3afcaa47064949dfa3b3209b
1f4ab7282e19ba4c80106bb4f6adf631c7d7ac7f48dd05bcb10b42768eb57913 37bea4ee0c816e3a3fa025f36127ef8ef0817b3f8fcd7b49eb7b26064f647bb0 c6153b5d8f1ff7de06410275d26bed8163e39cee970d052d457aef2d1658c383
204704ce31375bcf4afecf672563b4881bbef0d59135c68d273235bb7254fb4b 3f8e22c413b1783145e785a4729c4d5f98f9baca025b74d73774ed438ac82ba2 e9e06b06e14c2f7d8df0251e3bb852c3a10a70639498163d4f180a823c18fdfc
22b1c756fa19552df56cee7d7dc685ba2411878dbfda0950e849941af91a7f43 4f4a5acb19eb919eac7b507368e36b9a1d55b79974c20704de9b3ed32d258429
./images/07f8e8c5e66084bef8f848877857537ffe1c47edd01a93af27e7161672ad0e95:
_checksum ancestry json layer
./images/0e4483abe66bcc57ffe504a9baf65432f4931e5f91da3d5257e9990580d4beb0:
_checksum ancestry json layer
./images/1f4ab7282e19ba4c80106bb4f6adf631c7d7ac7f48dd05bcb10b42768eb57913:
_checksum ancestry json layer
./images/204704ce31375bcf4afecf672563b4881bbef0d59135c68d273235bb7254fb4b:
_checksum ancestry json layer
./images/22b1c756fa19552df56cee7d7dc685ba2411878dbfda0950e849941af91a7f43:
_checksum ancestry json layer
./images/2bc4611f2ed7611f46c4aaee05e34b7a490671c79c41b827dc168377da95b041:
_checksum ancestry json layer
./images/30887473610f3f9354a34931cc43b8dd744d93375d6d95704d45313f843008dd:
_checksum ancestry json layer
./images/37bea4ee0c816e3a3fa025f36127ef8ef0817b3f8fcd7b49eb7b26064f647bb0:
_checksum ancestry json layer
./images/3f8e22c413b1783145e785a4729c4d5f98f9baca025b74d73774ed438ac82ba2:
_checksum ancestry json layer
./images/4f4a5acb19eb919eac7b507368e36b9a1d55b79974c20704de9b3ed32d258429:
_checksum ancestry json layer
./images/90607d8d09d11e65ed8f4e4f5b20d99ecc1db1539b7c96ef28884dcebb1cbee6:
_checksum ancestry json layer
./images/a82efea989f94b1d9fac76e26e37b0bbde11047a3afcaa47064949dfa3b3209b:
_checksum ancestry json layer
./images/c6153b5d8f1ff7de06410275d26bed8163e39cee970d052d457aef2d1658c383:
_checksum ancestry json layer
./images/e9e06b06e14c2f7d8df0251e3bb852c3a10a70639498163d4f180a823c18fdfc:
_checksum ancestry json layer
./repositories:
library
./repositories/library:
register
./repositories/library/register:
_index_images json tag_latest taglatest_json
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