3.1. Gather Hadoop Cluster Information

Before deploying your HDP installation, collect the host name or IPv4 address of each the following cluster components:

Required components:
- NameNode and optional Secondary NameNode
- ResourceManager
- Hive Server
- SlaveNode
- WebHCat
- Client Host
Optional components:
- Zookeeper
- HBase Master
- Flume
- Knox Gateway
- Ranger (requires MySQL client)
- Microsoft SQL Server configured with a Hive and Oozie database instance
- system account names and passwords

	Note
	The installer fails if it cannot resolve the host name of each cluster node. To determine the host name for a particular cluster node, open the command line interface on that system. Execute `hostname` and then `nslookup hostname`to verify that the name resolves to the correct IP address.