搭建docker私有仓库

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 搭建docker私仓,可以使用docker官方提供的registry镜像。该镜像目前有2.0,2.3和2.3.1版本。它只与1.6.0以上版本的docker兼容。搭建私仓的步骤如下:

 

一:无代理、无认证的registry

1:下载registry镜像:

docker pull  registry:2

  这里必须加上标签”:2”,否则的话,不加标签的registry,实际上下载的是标签为”latest”的registry镜像,则不能使用下面的nginx代理镜像:containersol/docker-registry-proxy

 

2:创建registry容器:

         在registry:2创建的私有仓库中,上传的镜像保存在容器的/var/lib/registry目录下。创建registry:2的容器时,会自动创建一个数据卷(Data Volumes),数据卷对应的宿主机下的目录一般为:/var/lib/docker/volumes/XXX/_data。

         可以在创建registry:2的容器时,通过-v参数,修改这种对应关系:

docker run -d -p 5000:5000 --restart=always –v  /opt/docker/registry/data:/var/lib/registry --name docker-registry registry:2

   除了可以将数据保存在当前主机的文件系统上,registry也支持其他基于云的存储系统,比如S3,Microsoft Azure, Ceph Rados, OpenStack Swift and Aliyun OSS等。可以在配置文件中进行配置:https://github.com/docker/distribution/blob/master/docs/configuration.md#storage

          以上其实已经创建好了一个docker私有仓库,但是这时候向其push或者pull时还是有问题的:

[@hh_93_197 /]# docker tag hello-world 192.168.1.104:5000/hello-world
[@hh_93_197 /]# docker push 192.168.1.104:5000/hello-world
The push refers to a repository [192.168.1.104:5000/hello-world]
unable to ping registry endpoint https://192.168.1.104:5000/v0/
v2 ping attempt failed with error: Get https://192.168.1.104:5000/v2/: tls: oversized record received with length 20527
 v1 ping attempt failed with error: Get https://192.168.1.104:5000/v1/_ping: tls: oversized record received with length 20527

     这是因为从docker1.3.2版本开始,使用registry时,必须使用TLS保证其安全。

 

         最简单的解决办法是,在需要连接该私有仓库的所有客户端docker宿主机上,修改dockerdaemon的配置文件,增加insecure-registry参数。

       比如,对于Redhat7的宿主机来说,新增文件/etc/systemd/system/docker.service.d/docker.conf,其内容配置如下:

[Service]
ExecStart=
ExecStart=/usr/bin/docker daemon -H fd:// --insecure-registry=192.168.1.104:5000

      然后,重启docker:

[[email protected] /]# systemctl daemon-reload
[[email protected] /]# service docker restart

    此时就可以使用该私有仓库了。

 

         但是,上面这种配置方式既不安全(所有人都可以push或pull),也很不方便(使用该私有仓库的所有宿主机上都这样进行配置)。

         下面是带有认证的registry私仓构建过程:

 

二:无代理,有认证的registry

         使用TLS认证registry容器时,必须有证书。一般情况下,是要去认证机构购买签名证书。这里使用openssl生成自签名的证书。

 

1:生成自签名证书

         一般情况下,证书只支持域名访问,要使其支持IP地址访问,需要修改配置文件openssl.cnf。

         在Redhat7系统中,文件所在位置是/etc/pki/tls/openssl.cnf。在其中的[ v3_ca]部分,添加subjectAltName选项:

[ v3_ca ]
subjectAltName = IP:192.168.1.104

    接下来就是生成自签名的证书:

mkdir -p /opt/docker/registry/certs
 
openssl req -x509 -days 3650 -nodes -newkey rsa:2048 -keyout /opt/docker/registry/certs/domain.key -out /opt/docker/registry/certs/domain.crt

  

Country Name (2 letter code) [XX]:
State or Province Name (full name) []:
Locality Name (eg, city) [Default City]:
Organization Name (eg, company) [Default Company Ltd]:
Organizational Unit Name (eg, section) []:
Common Name (eg, your name or your server‘s hostname) []:192.168.1.104:5000
Email Address []:

   这里的服务器域名写成”192.168.1.104:5000”,后续就使用该地址访问私仓。其余项直接回车即可。

 

2:创建带有TLS认证的registry容器

docker run -d --name docker-registry-no-proxy  --restart=always -v /opt/docker/registry/data:/var/lib/registry -u root -p 192.168.1.104:5000:5000 -v /opt/docker/registry/certs:/certs -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/domain.crt -e REGISTRY_HTTP_TLS_KEY=/certs/domain.key registry:2

 

3:配置客户端宿主机

         目前,已经搭建好了一个registry私有仓库了。但是,访问该私仓还是会报错:

# docker pull 192.168.1.104:5000/redis
Using default tag: latest
Error response from daemon: unable to ping registry endpoint https://192.168.1.104:5000/v0/
v2 ping attempt failed with error: Get https://192.168.1.104:5000/v2/: x509: certificate signed by unknown authority
 v1 ping attempt failed with error: Get https://192.168.1.104:5000/v1/_ping: x509: certificate signed by unknown authority

    这是因为客户端宿主机上没有相应的证书。需要把registry所在主机上,刚生成的证书:

/opt/docker/registry/certs/domain.crt

         复制到客户端宿主机上的:

/etc/docker/certs.d/192.168.1.104:5000/ca.crt

 

         之后,就可以使用该私仓了:

# docker pull 192.168.1.104:5000/redis
Using default tag: latest
latest: Pulling from redis
80ab95908a2b: Pull complete 
a3ed95caeb02: Pull complete 
47a0d79f89b9: Pull complete 
7190081b1686: Pull complete 
fe09c22d81ac: Pull complete 
a5eae2bcc645: Pull complete 
662723161f77: Pull complete 
b568670a8ccd: Pull complete 
a1a961e320bc: Pull complete 
Digest: sha256:769ac80a4711258ec4d6d325f3ad31fbce3bbfa006d5f8aae94c94917dfb0384
Status: Downloaded newer image for 192.168.1.104:5000/redis:latest

   更好的方式是使用nginx代理,由nginx提供https的ssl的认证和basicauthentication。方法如下:

 

三:nginx代理,域名访问的registry

1:生成自签名证书:

mkdir -p /opt/docker/registry/conf
openssl req -x509 -days 3650 -nodes -newkey rsa:2048 -keyout /opt/docker/registry/conf/docker-registry.key -out /opt/docker/registry/conf/docker-registry.crt

  

Country Name (2 letter code) [XX]:
State or Province Name (full name) []:
Locality Name (eg, city) [Default City]:
Organization Name (eg, company) [Default Company Ltd]:
Organizational Unit Name (eg, section) []:
Common Name (eg, your name or your server‘s hostname) []:hh.registry.com
Email Address []:

 

         这里的服务器域名写成”hh.registry.com”,其余项直接回车即可。

 

2:创建能够访问仓库的用户名和密码

htpasswd -b -c -d /opt/docker/registry/conf/docker-registry.htpasswd admin admin

    这里的用户名和密码都是admin

 

3:运行nginx

         这里使用容器containersol/docker-registry-proxy运行nginx:

docker run -d -p 443:443 --name docker-registry-proxy -e REGISTRY_HOST="docker-registry" -e REGISTRY_PORT="5000" -e SERVER_NAME="hh.registry.com" --link docker-registry:docker-registry -v /opt/docker/registry/conf/docker-registry.htpasswd:/etc/nginx/.htpasswd:ro -v /opt/docker/registry/conf:/etc/nginx/ssl:ro containersol/docker-registry-proxy

         注意,这里的环境变量SERVER_NAME也要设置成”hh.registry.com”.

 

         目前,就已经搭建好了一个registry私有仓库了。但是,还需要在使用它的客户端宿主机执行以下的操作。比如在私有仓库所在的主机上使用它,也要执行以下步骤:

 

4:修改/etc/hosts文件,增加以下内容,以使客户端宿主机可以解析域名”hh.registry.com”

192.168.1.104 hh.registry.com

  

5:复制证书

mkdir -p /etc/docker/certs.d/hh.registry.com
cp /opt/docker/registry/conf/docker-registry.crt /etc/docker/certs.d/hh.registry.com/ca.crt

   这里是在registry所在主机上进行的操作。如果是其他docker宿主机,需要远程复制该crt文件。

 

         客户端宿主机配置好以后,通过下面的方式验证私有仓库的可用性:

6:列出私有仓库上的所有镜像

#curl -X GET https://admin:[email protected]/v2/_catalog -k
{"repositories":["hello-world","ubuntu"]}

   

7:登陆

#docker login -u admin -p admin   hh.registry.com
WARNING: login credentials saved in /root/.docker/config.json
Login Succeeded

  

8:pull镜像

#docker pull hh.registry.com/ubuntu
Using default tag: latest
latest: Pulling from ubuntu
5a132a7e7af1: Pull complete 
fd2731e4c50c: Pull complete 
28a2f68d1120: Pull complete 
a3ed95caeb02: Pull complete 
Digest: sha256:9409f5e54fdc68ef3f0aae3c5ffac22bfe2aabd0b363a4bdbe5292c93b75a661
Status: Downloaded newer image for hh.registry.com/ubuntu:latest

 

9:push镜像

# docker tag registry.aliyuncs.com/ddbmh/redis hh.registry.com/redis
# docker push hh.registry.com/redis
The push refers to a repository [hh.registry.com/redis]
5f70bf18a086: Mounted from ubuntu 
7986f971c50f: Pushed 
590d3336f33c: Pushed 
4458b6e6f424: Pushed 
39d2b75cc73d: Pushed 
cbc6c973b349: Pushed 
d53a2702e023: Pushed 
5bca8d976dd8: Pushed 
603fd967d41c: Pushed 
latest: digest: sha256:769ac80a4711258ec4d6d325f3ad31fbce3bbfa006d5f8aae94c94917dfb0384 size: 3823

 

10:再次列出私有仓库中的所有镜像

# curl -X GET https://admin:[email protected]/v2/_catalog -k
{"repositories":["hello-world","redis","ubuntu"]}

 

四:nginx代理,IP访问的registry

         以上的步骤中,访问私仓只能使用域名”hh.registry.com”,如果使用IP访问,则会报错:

#docker login -u admin -p admin -e a 192.168.1.104
Error response from daemon: invalid registry endpoint https://192.168.1.104/v0/: unable to ping registry endpoint https://192.168.1.104/v0/
v2 ping attempt failed with error: Get https://192.168.1.104/v2/: x509: cannot validate certificate for 192.168.1.104 because it doesn‘t contain any IP SANs
...

 

         如果想用IP地址访问,则执行以下的步骤:

1:在文件/etc/pki/tls/openssl.cnf的[ v3_ca ]部分,添加subjectAltName选项

[ v3_ca ]
subjectAltName = IP:192.168.1.104

 

2:重新生成证书

openssl req -x509 -days 3650 -nodes -newkey rsa:2048 -keyout /opt/docker/registry/conf_ip/docker-registry.key -out /opt/docker/registry/conf_ip/docker-registry.crt

 

Country Name (2 letter code) [XX]:
State or Province Name (full name) []:
Locality Name (eg, city) [Default City]:
Organization Name (eg, company) [Default Company Ltd]:
Organizational Unit Name (eg, section) []:
Common Name (eg, your name or your server‘s hostname) []:hh.registry.com
Email Address []:

  

         这里的服务器域名还是写成”hh.registry.com”即可。其余项直接回车即可。

 

3:创建能够访问仓库的用户名和密码

htpasswd -b -c -d /opt/docker/registry/conf_ip/docker-registry.htpasswd admin admin

    这里的用户名和密码都是admin

 

4:运行nginx容器

 

# docker stop docker-registry-proxy
docker-registry-proxy
 
# docker run -d -p 443:443 --name docker-registry-proxy-ip -e REGISTRY_HOST="docker-registry" -e REGISTRY_PORT="5000" -e SERVER_NAME="hh.registry.com" --link docker-registry:docker-registry -v /opt/docker/registry/conf_ip/docker-registry.htpasswd:/etc/nginx/.htpasswd:ro -v /opt/docker/registry/conf_ip:/etc/nginx/ssl:ro containersol/docker-registry-proxy

   

         搭建好registry私有仓库后,在需要访问该私仓的客户端docker宿主机上,无需修改/etc/hosts文件,直接将registry主机上的证书,复制成客户端docker宿主机上的/etc/docker/certs.d/192.168.1.104/ca.crt文件。

         客户端docker宿主机配置好以后,验证步骤如下:

# curl -X GET https://admin:[email protected]/v2/_catalog -k
{"repositories":["hello-world","redis","ubuntu"]}

  

# docker login -u admin -p admin -e a 192.168.1.104
WARNING: login credentials saved in /root/.docker/config.json
Login Succeeded

 

# docker pull 192.168.1.104/redis
Using default tag: latest
latest: Pulling from redis
80ab95908a2b: Pull complete 
a3ed95caeb02: Pull complete 
47a0d79f89b9: Pull complete 
7190081b1686: Pull complete 
fe09c22d81ac: Pull complete 
a5eae2bcc645: Pull complete 
662723161f77: Pull complete 
b568670a8ccd: Pull complete 
a1a961e320bc: Pull complete 
Digest: sha256:769ac80a4711258ec4d6d325f3ad31fbce3bbfa006d5f8aae94c94917dfb0384
Status: Downloaded newer image for 192.168.1.104/redis:latest

 

   

参考:

https://docs.docker.com/registry/

https://hub.docker.com/r/chalimartines/cdh5-pseudo-distributed/

http://www.pangxie.space/docker/353

https://docs.docker.com/registry/insecure/

http://www.tianmaying.com/tutorial/docker-registry

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