I was having a bit of trouble building kubernetes based on Vagrant on Mac OSX.
Seems like the issue is mainly due to wget complains about HTTPS certificates. So tweaked the scripts a bit to fix the error to successfully load the Kubernetes example.
KUBERNETES_PROVIDER=vagrant curl -sS https://raw.githubusercontent.com/tykoh/kubernetes/master/k8s.sh bash
Use the above instead of the example from Kubernetes' documents.
export KUBERNETES_PROVIDER=vagrant curl -sS https://get.k8s.io | bash
You can check out the tweaked to the script at GitHub. Basically, just add a flag to wget command so as not to check cert.