This plugin is used to set the node-selector annotation to the namespace. When the plugin is enabled, pass along a configuration file with the --admission-control-config-file command using the following format:

podNodeSelectorPluginConfig:
  clusterDefaultNodeSelector: <default-node-selectors-  
  labels>
  namespace1: <namespace-node-selectors-labels-1>
  namespace2: <namespace-node-selectors-labels-2>

By doing this, the node-selector annotation will be applied to the namespace. The pods on that namespace will then run on those matched nodes.