# Load balance UDP-based DNS traffic across two servers
stream {
    upstream dns_upstreams {
        server 172.16.16.20:53;
        server 172.16.226.22:53;
    }

    server {
        listen 53 udp;
        proxy_pass dns_upstreams;
        proxy_timeout 1s;
        proxy_responses 1;
        error_log logs/dns.log;
    }
}