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 able to be scheduled on nodes with specific taints.

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

Sure! If you have a node with a taint like key=value:NoSchedule, you can add a toleration to your pod spec 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 taint on a node, it won't be scheduled on that node. Instead, it will remain in a pending state until a suitable node is available.

Are there different types of taints?

Yes, there are three types of taints: NoSchedule, PreferNoSchedule, and NoExecute. Each type has different scheduling behaviors for pods.