Taints and tolerations are used to prevent a set of pods from scheduling running on some nodes. Taints are applied to nodes, while tolerations are specified for pods. The value of taints could be NoSchedule or NoExecute. If pods running one tainted node have no matching toleration, the pods will be evicted.

The DefaultTolerationSeconds plugin is used to set those pods without any toleration set. It will then apply for the default toleration for the taints notready:NoExecute and unreachable:NoExecute for 300 s. If a node is not ready or unreachable, wait for 300 seconds before the pod is evicted from the node.