Node Cordon

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Cordoning a node marks or taints the node as unschedulable. This prevents the scheduler from deploying new resources on that node. However, the resources that were deployed prior to cordoning off the node will remain intact.

This feature is in line with the node-cordon functionality of Kubernetes.

To add a label and cordon a node, execute:

kubectl-mayastor cordon node <node_name> <label>

To get the list of cordoned nodes, execute:

kubectl-mayastor get cordon nodes

To view the labels associated with a cordoned node, execute:

kubectl-mayastor get cordon node <node_name>

How to uncordon a node?

In order to make a node schedulable again, execute:

kubectl-mayastor uncordon node <node_name> <label>

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The above command allows the Kubernetes scheduler to deploy resources on the node.