Managing Node Labels

You can add different labels to nodes and define different attributes for labels. By using these node labels, you can quickly understand the characteristics of each node.

Node Label Usage Scenario

Node labels are mainly used in the following scenarios:

Node management: Node labels are used to classify nodes.
Node affinity or anti-affinity for workloads: By adding labels to nodes, you can schedule pods to specific nodes through node affinity or prevent pods from being scheduled to specific nodes through node anti-affinity. For details, see Configuring Node Affinity Scheduling (nodeAffinity).

Inherent Label of a Node

After a node is created, some fixed labels exist and cannot be deleted. For details about these labels, see Table 1.

Do not manually change the inherent labels that are automatically added to a node. If the manually changed value conflicts with the system value, the system value is used.

**Table 1** Inherent labels of a node
Key	Description
New: topology.kubernetes.io/region Old: failure-domain.beta.kubernetes.io/region	Region where the node is located
New: topology.kubernetes.io/zone Old: failure-domain.beta.kubernetes.io/zone	AZ where the node is located
New: node.kubernetes.io/baremetal Old: failure-domain.beta.kubernetes.io/is-baremetal	Whether the node is a bare metal node false indicates that the node is not a bare metal node.
node.kubernetes.io/container-engine	Container engine Example: docker or containerd
node.kubernetes.io/instance-type	Node specifications
kubernetes.io/arch	Node processor architecture
kubernetes.io/hostname	Node name
kubernetes.io/os	Node OS type
node.kubernetes.io/subnetid	ID of the subnet where the node is located
os.architecture	Node processor architecture For example, amd64 indicates a AMD64-bit processor.
os.name	Node OS name
os.version	Node OS kernel version
accelerator/huawei-npu	NPU node labels
accelerator	GPU node labels
cce.cloud.com/cce-nodepool	The dedicated label of a node in a node pool

Adding or Deleting a Node Label

Log in to the CCE console and click the cluster name to access the cluster console.
In the navigation pane, choose Nodes. On the displayed page, click the Nodes tab, select the target node and click Labels and Taints in the upper left corner.
In the displayed dialog box, click Add operation under Batch Operation, and then choose Add/Update or Delete.

Enter the key and value of the label to be added or deleted, and click OK.

For example, the key is deploy_qa and the value is true, indicating that the node is used to deploy the QA (test) environment.
After the label is added, check the added label in node data.