Pod fails with message "ErrImagePull: "pull QPS exceeded"" in OpenShift

Issue

• Why does a pod fail to start with the message "ErrImagePull: pull QPS exceeded" in OpenShift Container Platform?

• There are messages like the following one:

  Failed to pull image "image-registry.openshift-image-registry.svc:5000/prod/apiprod:abcd": pull QPS exceeded
  

• The node's journal logs show an error similar to the following:

  msg="Trying to access \"image-registry.openshift-image-registry.svc:5000/prod/apiprod:abcd\""
  msg="Image image-registry.openshift-image-registry.svc:5000/prod/apiprod:abcd not found" id=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx name=/runtime.v1alpha2.ImageService/ImageStatus
  pod_workers.go:190] "Error syncing pod, skipping" err="failed to \"StartContainer\" for \"returnsapi\" with ErrImagePull: \"pull QPS exceeded\"" pod="prod/apiprod-abcd" podUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx