====== Solr ======
  * http://webikon.com/cases/installing-apache-solr-4-7-multicore-on-ubuntu-12-04-and-tomcat7
  * https://cwiki.apache.org/confluence/display/solr/Getting+Started+with+SolrCloud
  * http://www.installationpage.com/solr/solr-admin-core-commands/
  * http://docs.ckan.org/en/ckan-2.2/appendices/solr-multicore.html#creating-another-solr-core
  * https://degreesofzero.com/article/how-to-configure-apache-solr-to-run-with-multiple-cores.html
  * http://pietervogelaar.nl/ubuntu-12-04-install-jetty-9

  * ''java7'' telepítése
  * Solr telepítése: <code bash>
cd /opt
wget 'http://xenia.sote.hu/ftp/mirrors/www.apache.org/lucene/solr/4.10.2/solr-4.10.2.tgz'
tar xvzf solr-4.10.2.tgz
mv solr-4.10.2 solr
rm solr-4.10.2.tgz
</code>