Let's say something like this is being return when attempting create a pod. Check out my article Run a pod on a specific node using taint and tolerations.

0/10 nodes are available: 1 node(s) had taint {region: east}, that the pod didn't tolerate, 1 node(s) had taint {region: west}, that the pod didn't tolerate, 3 node(s) had taint {node-role.kubernetes.io/master: }, that the pod didn't tolerate, 5 node(s) didn't match Pod's node affinity/selector.