title: multiple varnish servers with haproxy
body: <p>We're planning to add a second varnish server to our infraestructure. </p>
  
  <p>What it's the better method to balance the traffic throw the two servers? I think we can use haproxy in front of the two servers, but how to configure it to load balance the traffic between the 2 varnish? The ideal solution is that if one varnish is down all the traffic goes to the other.</p>
  
  <p>Edit: The ideal behaviour is an active/active conf, with 50% load each and if one goes down haproxy sends 100% load to the other.</p>