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+---
+prelude: >
+    In Newton cycle we included means to change various things in Kolla images
+    using override file. Full customization guide can be found here
+    http://docs.openstack.org/developer/kolla/image-building.html#dockerfile-customisation
+features:
+    - Customization mechanism for dockerfile
+    - Customization implemented in most of OpenStack services
+    - Ability to modify repositories, packages installed and keys installed
+    - Ability to inject or override code in certain placess across dockerfiles