What are Kubernetes taints and tolerations?

What are Kubernetes taints and tolerations?

Kubernetes taints are a way to mark a node so that no pods can be scheduled on it unless they tolerate the taint. Tolerations are the way for pods to be allowed to schedule onto nodes with matching taints.

Can you give me an example of how to use taints and tolerations?

Sure! For example, if you have a node that should only run critical workloads, you can taint it with key=value:NoSchedule. Then, only pods with a matching toleration can be scheduled on that node.

How do I apply a toleration to a pod?

You can apply a toleration in your pod specification like this: tolerations: [{ key: "key", operator: "Equal", value: "value", effect: "NoSchedule" }].

What happens if a pod doesn't have the required toleration?

If a pod doesn't have the required toleration for a tainted node, it won't be scheduled on that node.