Managing Clusters
Cloudera Manager can manage multiple clusters. Once you have successfully installed your first cluster, you can add additional clusters, running the same or a different version of CDH. You can then manage each cluster and its services independently.
On the Home page you can access many cluster-wide actions by selecting 
to the right of the cluster
name: add a service, start, stop, restart, deploy client configurations, enable Kerberos, and perform cluster refresh, rename, upgrade, and maintenance mode actions.
The Cloudera Manager configuration screens offer two layout options: classic and new. The classic layout is the default; however, on each configuration page you can easily switch
between the classic and new layouts using the Switch to XXX layout link at the top right of the page. All the configuration
procedures described in the Cloudera Manager documentation assume the classic layout.
- classic - pages are organized by role group and categories within the role group. For example, to display the JournalNode maximum log size property (JournalNode Max Log Size), select . When a configuration property has been set to a value different from the default, a Reset to the default value link displays.
- new - pages contain controls that allow you filter configuration properties based on configuration status, category, and group.For example, to display the JournalNode maximum log size property (JournalNode Max Log Size), click the and filters. When a configuration property has been set to a value different from the default, a reset to default value icon displays.