If your cluster does not have enough resources, you can expand it horizontally. Only core and task nodes can be expanded. When expanding a cluster, configurations default to be consistent with the ECS instance purchased previously.

Enter expansion interface

  1. On the Cluster Management page, click Details in the Actions column for the cluster that you want to upgrade node specification for.
  2. On the Cluster Overview page, click Change Configuration. From the drop-down list, select Scale Out.

Expansion interface

Expansion interface
Note Although expansion is supported, reduction is not.
  • Configuration: Displays the configurations of the current instance.
  • Billing Method: Displays the payment method of the current cluster.
  • Current Core Instances: Displays the total number of your current core nodes.
  • New Instances: Enter the quantity of instances that you want to add.
  • VSwitch: Displays the VSwitch of the current cluster.

Expansion status

In the following figure, the statuses of the cluster expansions are shown.
Expansion status

To view the expansion status of a cluster, click Core Instance Group (CORE) in the Cluster Overview panel. Nodes that are being expanded are displayed as Scaling Up/Out. When the status of an ECS instance changes to Normal, ECS has been added to the cluster and can now provide services.

Change password

After you expand a cluster, you can log on to the expanded node with SSH and change your root password. To do so, follow these steps:
  1. Log on the master host with SHH using the following command and obtain the public IP of the master cluster in the Cluster details 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 details panel. 
    ssh ip.of.worker
  4. Change your root password using the following command. 
    sudo passwd root