You can use a single engine to connect to multiple clouds, or you can install multiple engines to spread out the work. You must connect each engine to at least one Keystone server, but you can connect an engine to multiple Keystone servers. If you connect to an OpenStack cloud, then the version of your cloud must match the version of your Heat engine. For example, if you use the Heat engine that is provided with IBM UrbanCode Deploy version 6.2.1.1 or later, you can connect to only Kilo-level OpenStack clouds.
You can install engines in interactive mode or in silent mode, or you can extend existing engines that you use with OpenStack. If you do not currently use an engine with OpenStack, you must install an engine by using the provided installer. You must not extend a new stand-alone engine that you installed by using your Yum repository.