If your cluster resources (computing and storage resources) are insufficient, the cluster can be expanded horizontally. Only core and task nodes can be expanded. Configurations of expanding a cluster default to be consistent with the ECS instance purchased previously.

Expansion entry

Select the cluster to be expanded on the cluster list page, click More, and select Scale Up/Out. You can also click View Details on the right side of the cluster, and click Scale Up/Out in the upper right corner.

Expansion interface

Note Only expansion is supported. Reduction is not supported.
  • Configuration: Displays configurations of the current instance.
  • Billing Method: Displays the payment method of the current cluster.
  • Current Core Instances: Displays the quantity of all your current core nodes.
  • New Instances: Enter the quantity that you want to add. We recommend that you perform small-scale expansions each time, such as increasing one or two instances.
  • VSwitch: Displays the VSwitch of the current cluster.

Expansion status

The figure of cluster expansion statuses is shown as follows:

To view the expansion status of a cluster, in the Cluster Overview panel, go to the Core Instance Group (CORE) area. The node that is being expanded is displayed as Scaling Up/Out. When the status of an ECS instance changes to Normal, the ECS has been added into the cluster and can provide services normally.

Change password

After a cluster is expanded successfully, you can log on to the expanded node with SSH and change your root password. Follow these steps:
  1. Log on the master host using the following command with SHH and obtain the public IP of the master cluster in the Cluster Overview panel. 
    ssh root@ip.of.master
  2. Switch to the hadoop user.
    su hadoop
  3. Log on to the expanded node and obtain the intranet IP of the expanded node in the Cluster Overview panel.
    ssh ip.of.worker
  4. Change your root password using the following command.
    sudo passwd root