##Docker基于Nexus构建私有镜像仓库##

       安装Nexus Nexus是Sonatype提供的仓库管理平台，Nuexus Repository OSS3能够支持Maven、npm、Docker、YUM、Helm等格式数据的存储和发布；并且能够与Jekins、SonaQube和Eclipse等工具进行集成。

查看docker 并安装docker 启动docker服务

[root@localhost yum.repos.d]# yum list docker-ce.x86_64 --showduplicates | sort -r    

已加载插件：fastestmirror, langpacks
可安装的软件包
Loading mirror speeds from cached hostfile
docker-ce.x86_64                     3:20.10.5-3.el7                      docker
docker-ce.x86_64                     3:20.10.5-3.el7                      docker
docker-ce.x86_64                     3:19.03.13-3.el7                     docker
[root@localhost yum.repos.d]# 
[root@localhost yum.repos.d]# yum install docker-ce.x86_64 3:20.10.5-3.el7  -y 
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
.....
.....
.....
[root@localhost yum.repos.d]# systemctl start docker

创建目录nexus

[root@localhost /]# mkdir /home/nexus-data && chown -R 200 /home/nexus-data

 pull   sonatype/nexus3  镜像

[root@localhost /]# docker run -d --name nexus3 --restart=always -p 8081:8081 -p 8082:8082  -v  /home/nexus-data:/nexus-data sonatype/nexus3
Unable to find image 'sonatype/nexus3:latest' locally
latest: Pulling from sonatype/nexus3
1b890c73c3cf: Pull complete 
de63ba066b7c: Pull complete 
b96fec3b344c: Pull complete 
9139abc9b143: Pull complete 
Digest: sha256:4267d43f2fd71d2f70f210fe6a5a21eb4db2f2079f9cf8008f66194221d68cc6
Status: Downloaded newer image for sonatype/nexus3:latest
caa930455d0676bf382558a2342a9f11caa5897993846b1cc4ee039d0bb193f8
[root@localhost /]# 

参数说明

-d：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/root/nexus-data目录挂载到容器/var/nexus-data目录,来实现数据的持久化
-p：映射端口,访问宿主机的8081端口就访问到nexus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 nexus：创建容器命名为nexus,你可以随便命名
sonatype/nexus3：pull下来的镜像

访问nexus

   在浏览器输入：http://ip:8081即可看到以下页面：(ip为远程主机的ip地址)

 构建私有镜像仓库

在nexus部署成功后，在浏览器中通过http://{host_ip}:8081地址访问nexus应用。通过管理员帐户登录admin，

[root@localhost /]# find / -name 'admin.password'
/home/nexus-data/admin.password
[root@localhost /]# cd /home/nexus-data/
[root@localhost nexus-data]# cat admin.password 
dc334427-c688-4978-b005-01fdc5266c55

更改密码

设置 匿名用户登陆允许与不允许

admin登陆成功

先创建Blos Store 

 创建为docker的镜像仓库的主页

在创建镜像仓库的页面中，设置镜像仓库的相关信息，包括名称、HTTP端口、是否允许匿名拉取镜像等信息。这里需要注意的是，此处的HTTP端口(此处的值为1008)很重要，后续拉取和推送进行是使用此端口进行的，而不是nexus本身对外暴露的端口。另外，如果允许设置通过匿名的方式拉取镜像。

 点击 Create repository 创建仓库

 选docker（hosted）

group 代表组的概念
hosted 代表本地仓库
proxy 代表代理库

 创建docker成功

配置私有仓库地址

vim  /etc/docker/daemon.json

{
"insecure-registries":["192.168.100.201:8082"]
}

重启dockers服务

[root@localhost /]# systemctl restart docker

通过ip登录nexus的docker仓库:

root@localhost /]# docker login -u admin -p admin123 192.168.100.201:8082
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded

外网拉取一个nginx镜像  然后打包上传到仓库里

[root@localhost /]# docker pull nginx
Using default tag: latest
latest: Pulling from library/nginx
461246efe0a7: Pull complete 
a96aaf9a9ec3: Pull complete 
650d8b758441: Pull complete 
b138da793ac8: Pull complete 
bb1705539683: Pull complete 
b9ed43dcc388: Pull complete 
Digest: sha256:dbe677093f569cc0afe2a149c529645f255aac959490ef11fb19ac6418b815d3
Status: Downloaded newer image for nginx:latest
docker.io/library/nginx:latest
[root@localhost /]# docker tag nginx 192.168.100.201:8082/nginx:latest
[root@localhost /]# docker push 192.168.100.201:8082/nginx:latest
The push refers to repository [192.168.100.201:8082/nginx]
de100bd247e0: Pushed 
1d561d938628: Pushed 
c03189a5ef70: Pushed 
305b0db3a210: Pushed 
1c99a7efe9d9: Pushed 
43b3c4e3001c: Pushed 
latest: digest: sha256:33cef86aae4e8487ff23a6ca16012fac28ff9e7a5e9759d291a7da06e36ac958 size: 1570
[root@localhost /]# docker images
REPOSITORY                  TAG       IMAGE ID       CREATED        SIZE
192.168.100.201:8082/nginx   latest    41b0e86104ba   28 hours ago   142MB
nginx                       latest    41b0e86104ba   28 hours ago   142MB
sonatype/nexus3             latest    be6da324b885   2 weeks ago    691MB

删除本地拉取的nginx镜像

[root@localhost /]# docker rmi  nginx -f
Untagged: nginx:latest
Untagged: nginx@sha256:dbe677093f569cc0afe2a149c529645f255aac959490ef11fb19ac6418b815d3
[root@localhost /]# docker images 
REPOSITORY                  TAG       IMAGE ID       CREATED        SIZE
192.168.100.201:8082/nginx   latest    41b0e86104ba   28 hours ago   142MB
sonatype/nexus3             latest    be6da324b885   2 weeks ago    691MB
[root@localhost /]# docker rmi  41b0e86104ba  -f
Untagged: 192.168.100.201:8082/nginx:latest
Untagged: 192.168.100.201:8082/nginx@sha256:33cef86aae4e8487ff23a6ca16012fac28ff9e7a5e9759d291a7da06e36ac958
Deleted: sha256:41b0e86104ba681811bf60b4d6970ed24dd59e282b36c352b8a55823bbb5e14a
Deleted: sha256:5b8db2b837c760a16b7601957d396e54cb3f380afebdbbe470c196b893595c13
Deleted: sha256:16853b6287c4a49ee01cdb339551006a7f0d44998e3f34d96d278c9bb1231a3b
Deleted: sha256:f7fda29b37af8235a59ddb4605022f5dd11159e691416e107bafce7d1ba9ad8e
Deleted: sha256:7bf023646dc1734fedf0cb2d126ba2012ded08d54f3bc2e53eea922a464632f2
Deleted: sha256:8330aef2496d3fdb47b47c02b9041f29fe572eacb11a028e20c3542242200429
Deleted: sha256:43b3c4e3001c662d1c264ffb132f4e52950893452b15508df810214f1d3f124b
[root@localhost /]# docker images 
REPOSITORY        TAG       IMAGE ID       CREATED       SIZE
sonatype/nexus3   latest    be6da324b885   2 weeks ago   691MB
[root@localhost /]# 

进入网页Nexus仓库

查看nginx镜像成功

 镜像pull下载成功:

[root@localhost /]# docker pull 192.168.100.201:8082/nginx:latest
latest: Pulling from nginx
461246efe0a7: Pull complete 
a96aaf9a9ec3: Pull complete 
650d8b758441: Pull complete 
b138da793ac8: Pull complete 
bb1705539683: Pull complete 
b9ed43dcc388: Pull complete 
Digest: sha256:33cef86aae4e8487ff23a6ca16012fac28ff9e7a5e9759d291a7da06e36ac958
Status: Downloaded newer image for 192.168.100.201:8082/nginx:latest
192.168.100.201:8082/nginx:latest

[root@localhost /]# docker images 
REPOSITORY                  TAG       IMAGE ID       CREATED        SIZE
192.168.100.201:8082/nginx   latest    41b0e86104ba   29 hours ago   142MB
sonatype/nexus3             latest    be6da324b885   2 weeks ago    691MB