Adjusting the number of compute nodes in a cluster to meet varying workload demands. This is a core principle of IEC management to ensuring resource efficiency, cost-effectiveness, and system performance.

Adding a Node to the Cluster

Note:

If you initially use Kubernetes with a single node, this function is not supported.

When cluster resources need to be expanded, users can add nodes through the management interface, EonOne for KS. Before adding a new node, please ensure that the FW of the node is consistent with the existing cluster.

In this chapter, the "new node" refers to the specific node that you want to add into the cluster. This node does not have to be a brand-new system. Before adding the new node, make sure that the following:

• The status of every existing node is OK.
• The new node and the existing nodes in the cluster are installed with the same firmware version. If needed, update the firmware of the new node before addition.

Procedure

1. Go to EonOne for KS > Settings > Node > Nodes.
2. Click Add a node. The system starts scanning for available nodes that can join the cluster.
3. (Optional) If the new node requires a firmware update, click the S/N of that node to connect to another page. If not, skip to step 3.
   By clicking the S/N, you will be directed to the node management interface. This page enables you update the firmware of this node. For more information, see Updating the Firmware
4. Select a desired node to join the cluster.
5. To ensure that you select the desired node, enable UID LED to light up the node's LED.
   • Node name: Specify an identifying name.
   • Node role: Select the role as a Control Plane or a Worker.
   • Storage network: Specify two IP addresses of the channels.
   • Host network: Specify two IP addresses of the channels.
6. Choose SSD over-provisioning percentage: 17%, 10%, or Customize. When choosing Customize, specify the percentage from 0 to 50.
7. Check the settings. If the settings are OK, click Next to add the new node to the cluster. To change the settings, click Previous.
8. View the additional progress. When the node is successfully added, click Finish.
9. Back to the Node list, you could double check the node information by clicking Details.

Removing a Computing Node

Note:

If you initially use Kubernetes with a single node, this function is not supported.

When some nodes are no longer needed, users can perform safe node removal operations through EonOne for KS. Before removing a node, it is recommended to migrate all workloads on the node to other nodes or suspend operations to prevent data loss or service interruption. After the node is removed, IEC will automatically adjust the resource allocation in the cluster to ensure stable operation of the system.

Before deleting a node, consider the following:

• Consider the number of Control Planes and Workers:
  • Control Planes: Three Control Planes can ensure the cluster to work properly. Though the cluster can still operate with two Control Planes, it is recommended that you change the node role assignment before deletion or immediately choose one more node to serve as a Control Plane after deletion.
  • Worker: At least one Worker is required.
• A pod running on another node may be using the storage space in this node. Stop the pod before deleting this node.
• If any persistent volume (PV) on this node whose data replicas is still in progress, to prevent data loss, it is recommended that you wait until the process is completed.
• For a PV with the attribute "replica=1," after you delete this node, the data will also be deleted permanently. Make sure that you have backed up the data before deletion.

Procedure

1. Go to EonOne for KS > Settings > Node > Nodes.
2. Go to the Node list section.
3. Select a desired node entry, and click More > Delete.