Removing or Repairing Hosts in a Cluster

Cloudera Director can reduce the size of a cluster by removing hosts that contain worker or gateway roles.

To shrink a cluster:

1. Log in to Cloudera Director at http://director-server-hostname:7189.

   Cloudera Director opens with a list of clusters.

2. If the cluster has a status of Ready, click the Actions list box to the right of the cluster to shrink and select Modify Cluster.

   The Modify Cluster page appears, displaying the number of gateways, workers, and masters.

3. To remove all instances for a role type:
   • On the Modify Cluster page, click Delete Group.

   To remove individual instances (that is, individual hosts for a role instance group):

   • Click Edit next to the instance count for workers or gateways, select the hosts you want to remove, and click the Delete button above the list of instances. The instances you selected display an action status of To be deleted.
4. Click OK to continue, Reset to unselect the selected instances and make a new selection, or Cancel to stop editing the instance group without making any changes.
5. Click Continue to confirm and delete the selected instances.

To repair hosts in a cluster:

1. Log in to Cloudera Director at http://director-server-hostname:7189.

   Cloudera Director opens with a list of clusters.

2. If the cluster has a status of Ready, click the Actions list box to the right of the cluster to repair and select Modify Cluster.

   The Modify Cluster page appears, displaying the number of gateways, workers, and masters.

3. Click Edit next to the instance count for workers or gateways you want to repair, and select the hosts you want to repair.
4. Click the Repair button above the list of instances. The hosts you selected display an action status of To be repaired.
5. Click OK to continue, Reset to unselect the selected instances and make a new selection, or Cancel to stop editing the instance group without making any changes.
6. Click Continue to confirm and repair the selected instances.