How to secure solr collection? I have an active directory server, ranger
You can use Ranger to control which users have access to which collections in Solr. You will need to enable the Solr Ranger plugin in the Ambari -> Ranger -> Configs -> Plugins section for this to work.
Check this article for details: https://community.hortonworks.com/content/kbentry/15159/securing-solr-collections-with-ranger-kerber...