Master Node Management in Kubernetes: Cordon and Uncordon Explained

 In Kubernetes, the master node is the control plane responsible for managing cluster operations. While workloads like pods generally run on worker nodes, there might be scenarios where you need to manage scheduling on the master node itself. Two essential commands for this are cordon and uncordon, which help control pod scheduling on the node.

This blog post will explain what cordoning and uncordoning mean and how you can use these commands to manage your Kubernetes master node efficiently.

What Is Cordoning and Uncordoning?

• Cordon: This action marks a node as unschedulable, preventing any new pods from being scheduled on it. However, existing pods on the node will continue to run.

• Uncordon: This reverses the cordon operation, making the node schedulable again. New pods can then be scheduled on the node.

These commands are especially useful during maintenance tasks or when troubleshooting node issues.

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