Nexus3 的 group 仓库推送镜像功能属于 Pro 版本权限。为实现私有镜像管理，我们可以通过 Docker API 请求类型区分来转发请求，借助 Nginx 实现不同请求的转发至相应仓库。

仓库配置

以下为仓库配置截图：

nginx配置

client_max_body_size 1G;
proxy_send_timeout 120;
proxy_read_timeout 300;
proxy_buffering    off;
proxy_request_buffering off;
tcp_nodelay        on;

map $request_method $backend {
    default http://nexus/repository/docker-group;
    PUT http://nexus/repository/docker-hosted;
}

server {
    listen 80;
    server_name _;

    # 强制HTTPS
    return 301 https://$host$request_uri;
}

server {

    keepalive_timeout  5 5;

    listen 443 ssl;
    server_name repo.niconi.cn;

    ssl_certificate /etc/nginx/ssl/cert.pem;
    ssl_certificate_key /etc/nginx/ssl/key.pem;

    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

   # 匹配上传请求
   location ~ ^/v2/.+/blobs/uploads/ {
       proxy_set_header Host $host:$server_port;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header X-Forwarded-Proto "https";

       proxy_pass http://nexus/repository/docker-hosted$request_uri;
   }


   location /v2 {
       proxy_set_header Host $host:$server_port;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header X-Forwarded-Proto "https";
       proxy_pass $backend$request_uri;
   }

   location /v1 {
     proxy_set_header Host $host:$server_port;
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto "https";
     proxy_pass $backend$request_uri;
  }


    # Regular Nexus requests
    location / {
        proxy_set_header Host $host:$server_port;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto "https";
        proxy_pass http://nexus/;
    }
}

说明

1. 请求类型映射：通过 $request_method 将 PUT 请求定向至 docker-hosted 仓库，其他请求则转发至 docker-group 仓库。、
2. SSL 配置：采用 TLSv1.2 和 TLSv1.3 协议，使用高强度加密算法，提高传输安全性。
3. 特定请求路径：/v2/.+/blobs/uploads/ 匹配 Docker 上传请求，并将其转发至 docker-hosted 仓库，以保证镜像上传的稳定性。
4. 一般请求：其他所有请求默认转发至 Nexus。