Ambari Serve and Agent on the same host machine

[#1]

For evaluation purpose, I am planning to install everything on the same host machine. Do I have to install Ambari-Agent also before I can add the host machine as a node in the cluster ??

Thanks

[#2]

Yes, install both server and agent on same node.  Be careful with trying to do too many components/services on a single node with small ram/cores.   If you try to run/install all of them you will have troubles getting cluster stable.  Minimal install is like Hdfs, Yarn, MapReduce, AmbariMetrics, Zookeeper, Hive/Tez, Ranger.