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Kubernetes Taints and Toleration

Taints and toleration A taint is applied to a node that indicates only specific pods can be scheduled on them. A toleration is then applied to a pod that allows them to tolerate a node's taint. Taint is on Node. BY default master node has a taint to prevent pods to be scheduled on master nodes Toleration is on POD. By default PODs don't have any toleration You taint the node that particular type of PODS which have tolerance for those nodes are placed on those nodes. POD which needs to be placed on tainted nodes should have a toleration parameter so that they are placed on tainted nodes Generally if you want pod to go on a particular node, you use combination of node affinity and taints/toleration There are 3 taint effects NoSchedule then Kubernetes will not schedule the pod onto that node PreferNoSchedule then Kubernetes will try to not schedule the pod onto the node NoExecute then the pod will be evicted from the node (if it is already running on the node), and will not be scheduled onto the node (if it is not yet running on the node).