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Virtlet pod example

In order to try out the example, do the following on a cluster that has nodes with Virtlet on it (see the instructions in deploy/ directory):

  1. Create a sample VM:
kubectl create -f cirros-vm.yaml
  1. Wait for cirros-vm pod to become Running:
kubectl get pods -w
  1. Connect to the VM console:
kubectl attach -it cirros-vm
  1. As soon as the VM has booted, you can use virtletctl tool (available as part of each Virtlet release on GitHub starting from Virtlet 1.0):
virtletctl ssh cirros@cirros-vm -- -i examples/vmkey [command...]

Besides cirros-vm.yaml, there's also ubuntu-vm.yaml that can be used to start an Ubuntu Xenial VM and fedora-vm.yaml that starts a Fedora VM. These VMs can also be accessed using virtletctl ssh after it boots:

virtletctl ssh ubuntu@ubuntu-vm -- -i examples/vmkey [command...]
virtletctl ssh fedora@fedora-vm -- -i examples/vmkey [command...]

Kubernetes on VM-based StatefulSet

Another example involves starting several VMs using StatefulSet and deploying Kubernetes using kubeadm on it.

You can create the cluster like this:

kubectl create -f k8s.yaml

Watch progress of the cluster setup via the VM console:

kubectl attach -it k8s-0

After it's complete you can log into the master node:

virtletctl ssh root@k8s-0 -- -i examples/vmkey

There you can wait a bit for k8s nodes and pods to become ready. You can list them using the following commands inside the VM:

kubectl get nodes -w
# Press Ctrl-C when all 3 nodes are present and Ready
kubectl get pods --all-namespaces -o wide -w
# Press Ctrl-C when all the pods are ready

You can then deploy and test nginx on the inner cluster:

kubectl run nginx --image=nginx --expose --port 80
kubectl get pods -w
# Press Ctrl-C when the pod is ready
kubectl run bbtest --rm --attach --image=docker.io/busybox --restart=Never -- wget -O - http://nginx

After that you can follow the instructions to install Virtlet on the cluster if you want, but note that you'll have to disable KVM because nested virtualization is not yet supported by Virtlet.