Setting Reasonable Req and Limit Without Req and Limit set, when an application’s CPU or MEM spikes, it harms other Pods on the same node, and can even cause cluster nodes to be crushed one after another. Req and Limit have four values in total. If only some of them are set, then when node resource usage reaches the threshold preset by Kubelet, Kubelet evicts Pods in the order Guaranteed > Burstable > Best-Effort