Hadoop is made up of a number of components. You must at a minimum install HDFS, but you can decide which of the other services you want to install. See Understand the Basics for more information on your options.
Select all to preselect all items or minimum to preselect only HDFS.
Use the checkboxes to unselect (if you have used all) or select (if you have used minimum) to arrive at your desired list of components.
![[Note]](../common/images/admon/note.png)
Note If you want to use Ambari for monitoring your cluster, make sure you select Nagios and Ganglia. If you do not select them, you get a warning popup when you finish this section. If you are using other monitoring tools, you can ignore the warning.
When you have made your selections, click Next.
