When your cluster resources (computing and storage resources) are insufficient, the cluster can be expanded horizontally. Only the Core node can be expanded. The hardware configuration is defaulted to be consistent with the ECS purchased previously.

Expansion entry

Find the clusters to be expanded on the cluster list page. Click Adjust scale to enter the cluster expansion page. You can also click View details to enter the cluster details page, and click Adjust cluster scale at the Core node information position on the details page.

Expansion interface

Note: Only expansion is supported, reduction is not supported.

• Quantity of current Master node: By default, the quantity is 1 and cannot be adjusted.

• Quantity of current Core: Displays the quantity of all your current Core nodes.

• Increase Core: Enter the quantity that you need to increase by. The total cost of the expanded cluster is displayed on the right side. Click Confirm to start expansion. For safety reasons, we strongly recommend that you expand small batches consisting of 1 or 2, rather than expanding a large quantity each time.

Expansion status

You can view the cluster expansion status through the Core node information on the details page. The node being expanded is displayed as “Expanding”. When the status of this ECS changes to “Normal”, the ECS has been added into the cluster and can provide services normally.