title: Single slave - multiple master MySQL replication
body: <p>I need to replicate <em>different</em> MySQL databases from multiple servers into a single slave server. How can this be done? Do I need a separate MySQL instance on the slave for each master server? Or is there a way to define multiple master hosts?</p>
  
  <p>We're basically using the slave as a hot backup for multiple websites. Should we be thinking about clustering instead of replication?</p>