title: Solr : replication options
body: <p>I've got a SOLR instance running behind a firewall. I'm about to put up another instance which will not be firewalled. Howevever, SOLR appears to only support pull replication and not push replication.</p>
  
  <p>What are my options with regard to maintaining the same level of security? I'd rather not open too many ports in the firewall. Would HTTP over a SSH tunnel be the best option? Would it also be possible to just replicate the index files using plain old rsync (not using any SOLR specific features) or would this break something?</p>