I've been able to successfully install Kubernetes in a CentOS 7 testing environment using the "virt7-testing" repo as described in the CentOS "Getting Started Guide" in the Kubernetes github repo. My production environment will be running on Oracle Linux 7, and so far enabling "virt7-testing" on OL7 hasn't been working.
Are there any other yum repositories out there that are compatible with OL7 and include Kubernetes?
A good start would be the rapidly updated fedora / epel kubernetes repositories.
Something like (untested)
yum --enablerepo=updates-testing install kubernetes kubernetes-devel flanneld docker
Should do it for you.