This page contains common words or phrases in the dev-ops community that will
be useful in understanding and maintaining the mybinder.org deployment.
Kubernetes page on cordoning.
Sometimes you want to ensure that no new pods will be started on a given
node. Usually this is because you suspect the node has a problem with it, or
you wish to remove the node but need it to be free of pods first.
Cordoning the node tells Kubernetes to make it unschedulable, which means new
pods won’t start on the node. It is common to wait several hours, then manually
remove any remaining pods on the node before removing it manually.