How Do I Change the Node Specifications in a CCE Cluster?

Notes and Constraints

Modifying node specifications is not a best practice recommended by CCE. Certain restrictions may affect subsequent usage, so review this section carefully.

To upgrade node specifications that do not meet requirements, it is advised to add new nodes and then scale in the original nodes.

• After a node's specifications are changed, the maximum number of pods (maxPods configured by kubelet) will not be updated automatically. Ensure that the maximum number of pods configured for the node aligns with your requirements. For details, see Maximum Number of Pods That Can Be Created on a Node. Otherwise, even if the node specifications are increased, additional pods might still fail to run.
• After the specifications of a node in a node pool are modified on the ECS console, some unexpected problems may occur. For details, see What Are the Impacts of Changing the Flavor of a Node in a CCE Node Pool?
• CCE Turbo cluster nodes of certain specifications can be created only on the CCE console and cannot be modified on the ECS console. You can call the ECS API to modify the specifications. For details, see Modifying the Specifications of an ECS.

Solution

If the node whose specifications need to be changed is accepted into the cluster for management, remove the node from the cluster and then change the node specifications to avoid affecting services.

1. Log in to the CCE console and click the cluster. In the navigation pane, choose Nodes. Click the name of the node to display the ECS details page.
2. In the upper right corner of the ECS details page, click Stop. After the ECS is stopped, choose More > Modify Specifications.
3. On the Modify ECS Specifications page, select a flavor name and click Submit to finish the specification modification. Return to ECS list page and choose More > Start to start the ECS.
4. Log in to the CCE console and click the cluster name to access the cluster console. In the navigation pane, choose Nodes. Locate the target node in the node list, and click Sync Server Data in the Operation column. After the synchronization is complete, you can view that the node specifications are the same as the modified specifications of the ECS.

Common Issues

After the specifications of a node configured with CPU management policies are changed, the node may fail to be rebooted or workloads may fail to be created. In this case, rectify the fault by referring to What Should I Do If I Fail to Restart or Create Workloads on a Node After Modifying the Node Specifications?