Use nginx to implement simple load balancing, the configuration is as follows

...

http{
    ...
    
    upstream mytomcatscluster{
        #ip_hash 在同一台服务器部署了2个tomcat，使用不同的端口
        server 127.0.0.1:8080 weight=2;
        server 127.0.0.1:8180 weight=1;
    }
    
    ...
    
    server{
        ...
        
        # 将所有后端请求分发到我定义的集群服务器上
        location /service/fen/{
            proxy_pass http://mytomcatscluster;
        }
        
        ...
    }
}

...

The current problem is: If both tomcats are normal, nginx can distribute requests to the specified server normally. Using polling, the weight can also work, but if I give one of the tomcats If it is turned off, the request will be stuck, because there will be requests distributed by nginx to the failed server. How to deal with this situation? Does ngxin have a corresponding solution strategy? Is there a way for nginx to monitor the running status of cluster servers? How to configure?