Cloudera Manager can manage multiple clusters. Furthermore, the clusters do not need to run the same version of CDH; you can manage both CDH 4 and CDH 5 clusters with Cloudera
Manager.
Adding a Cluster
Action
Procedure
New Hosts
On the Home > Status tab, click
and select Add Cluster. This begins the Installation Wizard, just as if
you were installing a cluster for the first time. (See Step 7: Set Up a Cluster Using the Wizard for detailed
instructions.)
To find new hosts, not currently managed by Cloudera Manager, where you want to install CDH, enter the hostnames or IP addresses, and click Search.
Cloudera Manager lists the hosts you can use to configure a new cluster. Managed hosts that already have services installed will not be selectable.
Click Continue to install the new cluster. At this point the installation continues through the wizard the same as it did when you installed your
first cluster. You will be asked to select the version of CDH to install, which services you want and so on, just as previously.
Restart the Reports Manager role.
Managed Hosts
You may have hosts that are already "managed" but are not part of a cluster. You can have managed hosts that are not
part of a cluster when you have added hosts to Cloudera Manager either through the Add Host wizard, or by manually installing the Cloudera Manager agent onto hosts where you have not install any
other services. This will also be the case if you remove all services from a host so that it no longer is part of a cluster.
On the Home > Status tab, click and select Add Cluster. This begins the Installation Wizard, just as if you were installing a
cluster for the first time. (See Step 7: Set Up a Cluster Using the Wizard for detailed instructions.)
To see the list of the currently managed hosts, click the Currently Managed Hosts tab. This tab does not appear if you have no currently managed hosts
that are not part of a cluster.
To perform the installation, click Continue. Instead of searching for hosts, this will attempt to install onto any hosts managed by Cloudera Manager
that are not already part of a cluster. It will proceed with the installation wizard as for a new cluster installation.
and select Add Cluster. This begins the Installation Wizard, just as if
you were installing a cluster for the first time. (See 
to the right of the cluster name and select Delete.