Taints and Tolerations

Taints and tolerations are used to set restrictions on what pods can be shared.Taints and tolerations have nothing to do with security or intrusion on a cluster.

For eg; Assume we have dedicated resources on node 1 for a particular Application A.Then we dont want pods with any other applications on Node 1, so you place a taint on node 1. To allow the pods with A we add a Toleration to nodes which have A.

kubectl taint nodes node1 key1=value1:NoSchedule

tolerations:
- key: "key1"
  operator: "Equal"
  value: "value1"
  effect: "NoSchedule"