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Scale a Cluster

Once a cluster is operational, you have the option of scaling up the cluster by adding additional nodes, or scale down the cluster by removing nodes from the cluster using Local UI.

tech preview
This is a Tech Preview feature and is subject to change. Do not use this feature in production workloads.

Scale up a Cluster​

To scale up a cluster is to add additional nodes to an active cluster. You can scale up a cluster deployed on hosts installed in airgap mode in Local UI.

Prerequisites​

  • You have an active cluster composed of hosts installed in airgap mode. For more information, refer to Create Local Cluster.

  • The new host you plan to add to the cluster are linked with the host in the existing cluster. For more information, refer to Link Hosts.

  • You have access to the leader node of the cluster. For more information about leader host, refer to Link Hosts.

Procedure​

  1. Log in to Local UI on the leader node where your cluster is deployed.

  2. From the left Main Menu, click Cluster.

  3. On the Cluster page, click Nodes to view the Nodes tab.

  4. Select a node pool you want to edit. You can either edit the control plane or the worker pool.

  5. In the pop-up window,scroll down to Pool Configuration and click on Add Item.

  6. Select a host that you want to add to the node pool.

  7. Click Confirm to confirm your changes. It may take 15 to 25 minutes for the change to take effect, depending on your environment and workload.

Validate​

  1. Log in to Local UI on the leader node where your cluster is deployed.

  2. From the left Main Menu, click Cluster.

  3. On the Cluster page, click Nodes to view the Nodes tab.

  4. Confirm that the new node you added to the cluster is in the Running status.

Scale down a Cluster​

To scale down a cluster is to remove existing nodes from an active cluster. You can scale down a cluster deployed on hosts installed in airgap mode in Local UI.

Prerequisites​

  • You have an active multi-node cluster composed of hosts installed in airgap mode. For more information, refer to Create Local Cluster.

  • You have access to the leader node of the cluster. For more information about leader host, refer to Link Hosts.

Procedure​

  1. Log in to Local UI on the leader node where your cluster is deployed.

  2. From the left Main Menu, click Cluster.

  3. On the Cluster page, click Nodes to view the Nodes tab.

  4. Select a node pool you want to edit. You can either edit the control plane or the worker pool.

  5. In the pop-up window, scroll down to Pool Configuration. Click the Delete button next to the nodes you want to remove.

  6. When you are done removing nodes, Click Confirm to confirm your changes. It may take 15 to 25 minutes for the change to take effect depending on your environment and workload. If you have deleted all nodes in the worker pool, you can remove the pool altogether.

Validate​

  1. Log in to Local UI on the leader node where your cluster is deployed.

  2. From the left Main Menu, click Cluster.

  3. On the Cluster page, click Nodes to view the Nodes tab. Confirm that the node you removed is no longer in the cluster.