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Kubernetes (K8S) Integration

Security Warning

Running unikernels under kubernetes diminishes some of their security benefits, however, a lot of organizations still have heavy kubernetes installations so these are some ways you can still run unikernels in k8s.

Pre-requisites

You need access to hardware virtualization. If you are in the cloud the best way to get that is through NanoVMs Inception available on the AWS market. https://aws.amazon.com/marketplace/pp/prodview-lwk72eg6wfo3i. This will allow you to run kube-virt on plain old normal ec2 instances like an ec2.small without having to resort to expensive metal instances.

If you don't want to do that you'll either need a real physical computer or use metal instances.

Installing K8s / Initial Setup

Install KubeCtl:

  curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
  chmod +x ./kubectl
  mv kubectl /usr/local/bin/.
  sudo mv kubectl /usr/local/bin/.
  kubectl version --client

Install Minikube:

curl -Lo minikube
https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
&& chmod +x minikube
minikube start --vm-driver=kvm2

Install KVM tooling:

sudo apt-get install libvirt-daemon-system libvirt-clients bridge-utils

Ensure you are setup for KVM via libvirt and have associated permissions:

virt-host-validate

groups

Install KubeVirt:

export KUBEVIRT_VERSION=$(curl -s
https://api.github.com/repos/kubevirt/kubevirt/releases | grep tag_name
| grep -v -- - | sort -V | tail -1 | awk -F':' '{print $2}' | sed
's/,//' | xargs)
  echo $KUBEVIRT_VERSION

  kubectl create -f
https://github.com/kubevirt/kubevirt/releases/download/${KUBEVIRT_VERSION}/kubevirt-operator.yaml

Create a Resource:

kubectl create -f https://github.com/kubevirt/kubevirt/releases/download/${KUBEVIRT_VERSION}/kubevirt-cr.yaml

Install Virtctl:

curl -L -o virtctl \
https://github.com/kubevirt/kubevirt/releases/download/${KUBEVIRT_VERSION}/virtctl-${KUBEVIRT_VERSION}-linux-amd64
chmod +x virtctl

Import CDI:

  wget https://raw.githubusercontent.com/kubevirt/kubevirt.github.io/master/labs/manifests/storage-setup.yml
  kubectl create -f storage-setup.yml
  export VERSION=$(curl -s https://github.com/kubevirt/containerized-data-importer/releases/latest | grep -o "v[0-9]\.[0-9]*\.[0-9]*")
  kubectl create -f https://github.com/kubevirt/containerized-data-importer/releases/download/$VERSION/cdi-operator.yaml
  kubectl create -f https://github.com/kubevirt/containerized-data-importer/releases/download/$VERSION/cdi-cr.yaml
  kubectl get pods -n cdi

Building / Deploying

If you have the base kubernetes installation up and running you can move on to the final part.

You need to compress the disk image in question to xz format.

cp .ops/images/goweb.img .
xz goweb.img

Now you need to upload that to a url for k8s to import.

Download a sample PVC template:

wget https://raw.githubusercontent.com/kubevirt/kubevirt.github.io/master/labs/manifests/pvc_fedora.yml

Edit the line to point to your xz'd image:

cdi.kubevirt.io/storage.import.endpoint: "https://storage.googleapis.com/totally-insecure/goweb.img.xz"

Import:

kubectl create -f pvc_fedora.yml
kubectl get pvc fedora -o yaml

Create the Actual VM:

wget https://raw.githubusercontent.com/kubevirt/kubevirt.github.io/master/labs/manifests/vm1_pvc.yml
kubectl create -f vm1_pvc.yml

If you minikube ssh you should now be able to hit up your instance.