Tenginx UDP反向代理实现DNS服务器负载和高可用

worker_processes  auto;
events {
    worker_connections  65535;
}
pid         /var/log/nginx/nginx.pid;
stream {
       upstream dns_servers {
                                  server 192.168.10.11:53  max_fails=5 fail_timeout=10s;
                                  server 192.168.10.6:53  max_fails=5 fail_timeout=10s;
                                              }
                              server {
                                   listen 53 udp;
                                   listen 53;                                                                  
                                   proxy_timeout 5s;
                                   proxy_connect_timeout 1s;
                                   proxy_buffer_size 4096k;
                                   proxy_pass dns_servers;
                                   error_log /var/log/nginx/dns.log ;
                                             }
}