1、域名转发 

upstream tomcat_taobao {
	server 192.168.71.129:8081;	#访问的tomcat的IP
}

server {
	listen       80; #监听的对外端口
	server_name  www.taobao.com; #域名

	location / {
		proxy_pass   http://tomcat_taobao; #必须与服务器上对应的tomcat的upstream tomcat_taobao相对应
		index  index.html index.htm;
	}
}
	
upstream tomcat_sina {
	server 192.168.71.129:8082;	#访问的tomcat的IP
}

server {
	listen       80;#监听的对外端口
	server_name  www.sina.com;#域名

	location / {
		proxy_pass   http://tomcat_sina; #必须与服务器上对应的tomcat的upstream tomcat_sina相对应
		index  index.html index.htm;
	}
}

 2、端口转发

server {
    listen 80;
    autoindex on;
    server_name www.port.com;
    access_log c:/access.log combined;
    index index.html index.htm index.jsp index.php;
    #error_page 404 /404.html;
    if ( $query_string ~* ".*[\;'\<\>].*" ) {
        return 404;
    }

    location / {
        proxy_pass http://127.0.0.1:8080;
        add_header Access-COntrol-Allow-Origin *;
    }
}

3、目录转发 

server {
    listen 80;
    autoindex on;
    server_name www.stzg.com;
    access_log c:/access.log combined;
    index index.html index.htm index.jsp index.php;
    #error_page 404 /404.html;
    if ( $query_string ~* ".*[\;'\<\>].*" ) {
        return 404;
    }

    location / {
        root C:\file\img; # \是Windows /是Linux
        add_header Access-Control-Allow-Origin *;
    }
}

4、负载均衡

//简单的负载均衡，nginx支持ip_hash等分流，也支持插件自定义规则分流
upstream  model{ 
　　server 127.0.0.1:8080
　　server 127.0.0.1:8081
　　server 127.0.0.1:8082
}     
server {  
　　　　listen       80;
　　　　server_name  localhost;
　　　　location / {  
            proxy_pass model;  
            proxy_redirect default;  
　　　　} 
}

参考文章

https://blog.csdn.net/weixin_44550490/article/details/93369580

https://blog.csdn.net/kuaizisong/article/details/82790745

https://www.cnblogs.com/meetzy/p/8565507.html

https://www.jianshu.com/p/38810b49bc29

https://my.oschina.net/u/3703522/blog/1603984