Keep http://kubernetes.io/v1.0/ open in a browser, you'll need it.
Make sure you're in $DCOS_CLI_HOME. The, follow the instructions in https://docs.mesosphere.com/services/kubernetes/ to install Kubernetes:
$ dcos config prepend package.sources https://github.com/mesosphere/multiverse/archive/version-1.x.zip
$ dcos package update --validate
$ dcos package install kubernetes
... and then kubectl from there as well.
Once you have Kubernetes as a service installed and kubectl the CLI on your local laptop, do:
export KUBERNETES_MASTER=http://$DCOS_DASHBOARD_FQHN/service/kubernetes/api
... with $DCOS_DASHBOARD_FQHN being the FQHN of the DCOS dashboard URL.
Visit http://$DCOS_DASHBOARD_FQHN/service/kubernetes/api/v1/proxy/namespaces/kube-system/services/kube-ui/
$ cd $DCOS_CLI_HOME
$ kubectl run mh9-nginx --image=nginx --replicas=2 --port=80
$ kubectl get pods
$ kubectl delete rc mh9-nginx
$ cd $DCOS_CLI_HOME
$ kubectl create -f velocity-training/kubernetes/k8s-webserver-pod.json
$ kubectl get pods
$ kubectl create -f velocity-training/kubernetes/k8s-webserver-service.json
$ kubectl get services
NAME LABELS SELECTOR IP(S) PORT(S)
k8sm-scheduler component=scheduler,provider=k8sm <none> 10.10.10.9 10251/TCP
kubernetes component=apiserver,provider=kubernetes <none> 10.10.10.1 443/TCP
nginx-service name=nginx name=nginx 10.10.10.12 80/TCP
$ cd $DCOS_CLI_HOME
$ kubectl delete service nginx-service
$ kubectl delete pod nginx