Our cluster will need a networking layer for the pods to communicate on. Note that kubeadm requires a CNI compatible network fabric. The list of plugins currently available can be found here: http://kubernetes.io/docs/admin/addons/.

For our example, we will use calico. We will need to create the calico components on our cluster using the following yaml. For convenience, you can download it here: http://docs.projectcalico.org/v1.6/getting-started/kubernetes/installation/hosted/kubeadm/calico.yaml.

Once you have this file on your master, create the components with the following command:

$ kubectl apply -f calico.yaml

Give this a minute to run setup and then list the kube-system nodes in order to check this:

$ kubectl get pods --namespace=kube-system

You should get a listing similar to the following one with three new calico pods and one completed job that is not shown: