stream {
    upstream database {
        server db1:5432;
        server db2:5432;
    }

    server {
        listen 5432;
        proxy_pass database;
    }
}

stream {
    upstream dns {
        server 8.8.8.8:53;
        server 1.1.1.1:53;
    }

    server {
        listen 53 udp;
        proxy_pass dns;
    }
}