Taints and Tolerations
Taints and tolerations are used in Kubernetes to restrict or allow pods to be scheduled on certain nodes based on labels. A taint is a label that is applied to a node to indicate certain limitations or requirements. A toleration is a label applied to a pod to indicate that it can tolerate certain taints. When a node has a taint, only pods with the corresponding tolerations can be scheduled on that node. This feature is useful for various purposes, such as ensuring separation of critical and non-critical workloads, reserving nodes for certain tasks, and protecting nodes from overloading.
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