title: Which load balancer supports Master/Slave configuration?
body: <p>I am looking for load balancer for my web application that will support master-slave kind of configuration or algorithm support.</p>
  
  <p>For now I am using apache proxy but with round robin LB method.</p>
  
  <p>I am not sure if apache load balancer has master-slave support or any module?</p>
  
  <p>Here is what I want exactly: Forward all request to one back end server and once the master server is down the slave or other server will act as hot stub.</p>
  
  <p>Please suggest if any open source load balancer I can use w.r.t to my above requirement.</p>