@Jacek Dobrowolski 1. HDP2.4.x including Ranger is compatible with RHEL7. When we test and ultimately support any OS version, that is for complete distribution of HDP packages as given below. http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.4.0/bk_installing_manually_book/content/meet-min-system-requirements.html 2. Refer below for database supportability matrix, please ignore other. Ranger Support PostgreSQL 9.1.13+, 9.3. http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.2.0/bk_Installing_HDP_AMB/content/_database_requirements.html ... View more