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Utilizing KubeVirt to run a Fedora VM on top of Kubernetes

Under Development Public Domain




KubeVirt

KubeVirt technology addresses the needs of development teams that have adopted or want to adopt Kubernetes but possess existing Virtual Machine-based workloads that cannot be easily containerized. More specifically, the technology provides a unified development platform where developers can build, modify, and deploy applications residing in both Application Containers as well as Virtual Machines in a common, shared environment.

Project Dependencies

  • Minikube 1.5.2+
  • Kubectl 1.16.2+
  • Docker 19.03.5+

Steps for adding KubeVirt environment

Install Virtctl

chmod +x resources/virtctl
sudo mv resources/virtctl /usr/bin

Create KubeVirt Namespace

kubectl create ns kubevirt

Turn on emulation mode

kubectl create configmap -n kubevirt kubevirt-config --from-literal debug.useEmulation=true

Create and deploy KubeVirt operator to cluster

kubectl create -f resources/v0.24.0/kv-v0.24.0-operator.yaml

kubectl create -f resources/v0.24.0/kv-v0.24.0-cr.yaml

Check status of operator creation

watch -d kubectl get all -n kubevirt

Steps for adding CDI environment

Create and deploy CDI operator to cluster

kubectl create -f resources/v0.24.0/cdi-v1.11.0-operator.yaml

kubectl create -f resources/v0.24.0/cdi-v1.11.0-cr.yaml

Build image into PVC to test VM creation

mkdir fedora && cd $_
vim pvc_fedora1.yml

PVC details

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: fedora1
  labels:
    app: containerized-data-importer
  annotations:
    cdi.kubevirt.io/storage.import.endpoint: "https://download.fedoraproject.org/pub/fedora/linux/releases/30/Cloud/x86_64/images/Fedora-Cloud-Base-30-1.2.x86_64.raw.xz"
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi

Create the PVC with Fedora image

kubectl create -f pvc_fedora1.yml
#optional: watch the image download
kubectl logs -f $(kubectl get all | grep importer | cut -c -28)

Wait for CDI image import to complete

(K8s pod importer-fedora1-xxxxx will run then complete)

watch -d kubectl get all

Check to make sure PVC claim is bound

kubectl get pvc

Create VM and add public key

Add public key to startup-scripts/fedora-startup-script.sh in project.

vim vm_fedora1.yml

VM details

apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
metadata:
  generation: 1
  labels:
    kubevirt.io/os: linux
  name: fedora1
spec:
  running: true
  template:
    metadata:
      creationTimestamp: null
      labels:
        kubevirt.io/domain: fedora1
    spec:
      domain:
        cpu:
          cores: 2
        devices:
          disks:
          - disk:
              bus: virtio
            name: disk0
          - cdrom:
              bus: sata
              readonly: true
            name: cloudinitdisk
        machine:
          type: q35
        resources:
          requests:
            memory: 4096M
      volumes:
      - name: disk0
        persistentVolumeClaim:
          claimName: fedora1
      - name: cloudinitdisk
        cloudInitNoCloud:
          userDataBase64: $(cat ../startup-scripts/fedora-startup-script.sh | base64 -w0)

Note:
If command in userDataBase64 field doesn't produce value, run command outside of yaml and copy/paste into it

Apply to cluster and watch for creation

kubectl create -f vm_fedora1.yml
watch -d kubectl get all
virtctl console fedora1

Create nodeport service for SSH access

virtctl expose vmi fedora1 --name=fedora1-ssh --port=22 --type=NodePort

Grab nodeport created and ssh into box

kubectl get all
ssh fedora@<host machine ip> -p <service nodeport>

Acknowledgments 👍

  • KubeVirt.io. Great tutorials and code usage instructions