Nginx Reverse Proxy for Nexus Docker Registries

nginx.conf

### Credits
# https://visibilityspots.org/nexus-oss-repository-manager.html

user nginx;
worker_processes auto;

events {
    worker_connections 1024;
}

http {
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    proxy_buffering        off;
    proxy_send_timeout     120;
    proxy_read_timeout     300;
    proxy_intercept_errors off;
    keepalive_timeout      5 5;
    types_hash_max_size    2048;
    client_max_body_size   0;
  
    upstream nexus {
	server 0.0.0.0:8081;
    }
    
    upstream docker-private {
        server 0.0.0.0:8083;
    }
    
    # Docker Hosted and Docker Proxy
    upstream docker-group {
        server 0.0.0.0:8082;
    }
    
    map $request_method $docker {
        default "docker-private";
	"~GET" "docker-group";
    }
  
    server {
        listen       80;
	server_name  nexus.example.com;
	return 301 https://$server_name$request_uri;
    }
  
    server {
        listen       443 ssl http2;
        server_name  nexus.example.com;
	ssl_certificate      /etc/nginx/ssl/star_example_com.pem;
        ssl_certificate_key  /etc/nginx/ssl/star_example_com.key;
        
        location / {
          # 'docker' and 'Docker' for docker-cli
          # 'Go-http-client', 'go-containerregistry', 'kaniko' for kaniko project
          if ($http_user_agent ~ (docker|Docker|Go-http-client|go-containerregistry|kaniko)) {
            proxy_pass http://$docker;
          }
		
          proxy_pass http://nexus;
          proxy_set_header Host $host;
          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 $scheme;
          proxy_set_header X-Forwarded-Port $server_port;
        }
    }
}