If you are not familiar with the oc command, refer to OpenShift - Getting Started with the oc command.
A node contains one or more pods, and each pod contains one or more containers.
The oc label pod command can be used to apply one or more labels to a pod. In this example, label region=east is applied to the pod named my-app-c4v5h.
~]$ oc label pod my-app-c4v5h region=east pod/my-app-c4v5h labeled
And the oc describe pod command can be used to see the labels that have been applied to the pod.
~]$ oc describe pod my-app-c4v5h Name: my-app-c4v5h Namespace: foo Priority: 0 Node: worker-hsjrp/10.84.188.68 Start Time: Tue, 26 Jul 2022 07:22:41 -0500 Labels: region=east
And here is how you can remove a label. In this example, the region label will be removed.
~]$ oc label pod my-app-c4v5h region- pod/my-app-c4v5h labeled