How to retry image pull in a kubernetes Pods?
Usually in case of "ImagePullBackOff" it's retried after few seconds/minutes. In case you want to try again manually you can delete the old pod and recreate the pod. The one line command to delete and recreate the pod would be:
kubectl replace --force -f <yml_file_describing_pod>
In case of not having the yaml file:
kubectl get pod PODNAME -n NAMESPACE -o yaml | kubectl replace --force -f -