stream {
	
	match dig_health_check_txt {
	expect ~ \x7f\x00\x00\x01;
	send \xe7\x56\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x09\x6c\x6f\x63\x61\x6c\x68\x6f\x73\x74\x00\x00\x01\x00\x01;
	}

	server {
		health_check interval=3s fails=1 passes=2;
		server_name dns.example.com;
		listen 17.242.2.7:88;
		listen 17.242.2.7:88 udp;
		proxy_pass my_serivce;
	}

  

	upstream amy_serivce {
		server dns1.my_domain.com:53;
		server dns2.my_domain.com:53;
		least_conn;
		zone dns_my_domain.com 1024k;
	}
}