（一）registry定义和功能
1、registry注册中心是镜像存储的位置。
2、功能：集中的存储、分发镜像的服务，docker registry就是这样的服务。
3、Docker Registry组成：由三个部分组成：index，registry，registry client。
- Index：是负责登录、负责认证、负责存储镜像信息和负责对外显示的外部实现。
- repository：是负责存储镜像的内部实现 。 每个仓库可以包含多个 标签（Tag）；每个标签对应一个镜像。通常，一个仓库会包含同一个软件不同版本的镜像，而标签就常用于对应该软件的各个版本。 我们可以通过 <仓库名>:<标签> 的格式来指定具体是这个软件哪个版本的镜像。如果不给出标签，将以 latest 作为默认标签
- Registry Client：是docker客户端。
（二）、docker registry包括公共的 docker registry 和私有的docker registry
2.1 Docker Registry 公开服务是开放给用户使用、允许用户管理镜像的 Registry 服务。一般这类公开服务允许用户免费上传、下载公开的镜像，并可能提供收费服务供用户管理私有镜像。 最常用的是官方的Docker Hub也是默认的Registry,并拥有高质量的官方镜像。国内的是阿里云
2.2、私有 Docker Registry。用户还可以在本地搭建私有 Docker Registry。私有仓库优势： 1、节省带宽。 2、更加安全。 3、内部镜像统一管理。
备注：拉取镜像仓库镜像的格式：
docker pull [:]/[/]:
registry：仓库服务器地址：不指定默认是docker hub
port：端口；默认是443，因为是https协议
namespace：名称空间，指是哪个用户的仓库，如果是顶层仓库，可省
name：仓库名
tag：标签名；默认是latest版本
（三）、搭建私有仓库
1、下载
[root@otrs004097 ~]# docker pull registry
Using default tag: latest
latest: Pulling from library/registry
c87736221ed0: Pulling fs layer
1cc8e0bb44df: Pulling fs layer
54d33bcb37f5: Pulling fs layer
e8afc091c171: Waiting
b4541f6d3db6: Waiting
latest: Pulling from library/registry
c87736221ed0: Pull complete
1cc8e0bb44df: Pull complete
54d33bcb37f5: Pull complete
e8afc091c171: Pull complete
b4541f6d3db6: Pull complete
Digest: sha256:8004747f1e8cd820a148fb7499d71a76d45ff66bac6a29129bfdbfdc0154d146
Status: Downloaded newer image for registry:latest
docker.io/library/registry:latest2、通过registry镜像启动一个容器
[root@otrs004097 ~]# docker run -d -v /opt/docker-registry:/var/lib/registry -p 5000:5000 --name registry registry
6c01265a36274493fd362ab76819f262e344f8259b9a7b3ae056140ec11d1ec8
-itd：在容器中打开一个伪终端进行交互操作，并在后台运行；
-v：把宿主机的/data/registry目录绑定 到 容器/var/lib/registry目录(这个目录是registry容器中存放镜像文件的目录)，来实现数据的持久化；
-p：映射端口；访问宿主机的5000端口就访问到registry容器的服务了；
--restart=always：这是重启的策略，假如这个容器异常退出会自动重启容器；
--name registry：创建容器命名为registry，你可以随便命名；
registry:latest：这个是刚才pull下来的镜像； 3、查看运行状况
root@otrs004097 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6c01265a3627 registry "/entrypoint.sh /etc…" 4 seconds ago Up 2 seconds 0.0.0.0:5000->5000/tcp registry4、在浏览器输入改地址：http://192.168.4.97:5000/v2/，说明正常
{}
5、上传出现报错的时候 Get https://192.168.10.102:5000/v1/_ping: http: server gave HTTP response to HTTPS client
解决方法有两种：
方法一：修改注册中心文件/etc/docker/daemon.json，并重启docker
[root@otrs004097 ~]# vim /etc/docker/daemon.json
{ "registry-mirrors": ["http://hub-mirror.c.163.com"], "insecure-registries": ["192.168.4.97:5000"] }
[root@otrs004097 ~]# systemctl restart docker
注释： insecure-registries----->开放注册https协议 registry-mirrors----->仓库源
方法二、通过创建证书自带的TLS认证
5.1、生成自签名证书
[root@otrs004097 ~]# mkdir -p /opt/docker/registry/certs
[root@otrs004097 ~]# openssl req -newkey rsa:4096 -nodes -sha256 -keyout /opt/docker/registry/certs/domain.key -x509 -days 365 -out /opt/docker/registry/certs/domain.crt
Generating a 4096 bit RSA private key
.....................++
.....++
writing new private key to '/opt/docker/registry/certs/domain.key'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:shanghai
Locality Name (eg, city) [Default City]:shanghai
Organization Name (eg, company) [Default Company Ltd]:kj
Organizational Unit Name (eg, section) []:it
Common Name (eg, your name or your server's hostname) []:
Email Address []:
[root@otrs004097 ~]# ll /opt/docker/registry/certs/
total 8
-rw-r--r-- 1 root root 1944 Aug 20 11:04 domain.crt
-rw-r--r-- 1 root root 3272 Aug 20 11:04 domain.key
5.2.创建带有TLS认证的registry容器
[root@otrs004097 ~]# docker run -d --name registry2 -p 5000:5000 -v /opt/docker-registry/:/var/lib/registry -v /opt/docker/registry/certs:/certs -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/domain.crt -e REGISTRY_HTTP_TLS_KEY=/certs/domain.key registry:2
0ae56ecfbcd015e59503f01ec8e3f52143753d1137aab530a823d1461b989a01
5.3、通过浏览器输入进行访问
6.[root@otrs004097 certs.d]# curl -X GET https://192.168.4.97:5000/v2/ -k
{}
5.4、在其他服务器进行上传镜像。
[root@DEV004019 ~]# docker push 192.168.4.97:5000/lqb_nginx:v1
The push refers to repository [192.168.4.97:5000/lqb_nginx]
fe6a7a3b3f27: Pushed
d0673244f7d4: Pushed
d8a33133e477: Pushed
v1: digest: sha256:dc85890ba9763fe38b178b337d4ccc802874afe3c02e6c98c304f65b08af958f size: 948
5.5、查看上传的镜像
[root@otrs004097 certs.d]# curl -X GET https://192.168.4.97:5000/v2/_catalog -k
{"repositories":["lqb_nginx"]}
6、把需要上传的镜像，修改tag,为本地镜像，然后push。
[root@otrs004097 ~]# docker tag lqb2:v2.0 localhost:5000/lqb2v1:v1
[root@otrs004097 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
localhost:5000/yz v1.0 0011d86948f4 26 hours ago 346MB
localhost:5000/yzv1 v1 0011d86948f4 26 hours ago 346MB
lqb2 v2.0 62226ff8a5bc 27 hours ago 346MB
localhost:5000/lqb2v1 v1 62226ff8a5bc 27 hours ago 346MB
t1 latest ee097386456f 27 hours ago 380MB
[root@otrs004097 ~]# docker push localhost:5000/lqb2v1:v1
The push refers to repository [localhost:5000/lqb2v1]
fd214f756b32: Mounted from yzv1
v1: digest: sha256:dc7415d74223057a91d6525473e0aa7e1a8edd89ea63e9ec2166b2deeccb4fe2 size: 5297、打开浏览器输入：以下，会显示上传的镜像列表
http://192.168.4.97:5000/v2/_catalog
{"repositories":["lqb2v1","myubuntu","yzv1"]}
[root@otrs004097 ~]# curl -XGET HTTP://192.168.4.97:5000/v2/_catalog
{"repositories":["lqb2v1","myubuntu","yzv1"]}8、测试下载镜像，首先删除镜像，然后在下载
[root@otrs004097 ~]# docker rmi localhost:5000/lqb2v1:v1
Untagged: localhost:5000/lqb2v1:v1
Untagged: localhost:5000/lqb2v1@sha256:dc7415d74223057a91d6525473e0aa7e1a8edd89ea63e9ec2166b2deeccb4fe2
[root@otrs004097 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
localhost:5000/yzv1 v1 0011d86948f4 27 hours ago 346MB
localhost:5000/yz v1.0 0011d86948f4 27 hours ago 346MB
lqb2 v2.0 62226ff8a5bc 27 hours ago 346MB
t1 latest ee097386456f 27 hours ago 380MB
lqb1 v1.0 add4aac9e719 27 hours ago 369MB
[root@otrs004097 ~]# docker pull localhost:5000/lqb2v1:v1
v1: Pulling from lqb2v1
Digest: sha256:dc7415d74223057a91d6525473e0aa7e1a8edd89ea63e9ec2166b2deeccb4fe2
Status: Downloaded newer image for localhost:5000/lqb2v1:v1
localhost:5000/lqb2v1:v1
[root@otrs004097 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
localhost:5000/yz v1.0 0011d86948f4 27 hours ago 346MB
localhost:5000/yzv1 v1 0011d86948f4 27 hours ago 346MB
lqb2 v2.0 62226ff8a5bc 27 hours ago 346MB
localhost:5000/lqb2v1 v1 62226ff8a5bc 27 hours ago 346MB
pull和push都正常上传下载了
备注：
docker push :5000/:;上传镜像至私有仓库
docker pull :5000/:;从私有仓库pull镜像
docker run -d --name registry2 -p 5000:5000 -v /opt/docker-registry/:/var/lib/registry -v /opt/dcerts/:/certs -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/domain.crt -e REGISTRY_HTTP_TLS_KEY=/certs/domain.key registry:2