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Run Virtual Machine on Kubernetes? | Kubevirt Basic

https://medium.com/@topahadzi/run-virtual-machine-on-kubernetes-kubevirt-basic-bd3a123a6ec7

https://kubevirt-manager.io/

Topahadzi

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3 min read

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.

Benefits are broad and significant. Teams with a reliance on existing virtual machine-based workloads are empowered to rapidly containerize applications. With virtualized workloads placed directly in development workflows, teams can decompose them over time while still leveraging remaining virtualized components as is comfortably desired.

This article will help you to implement kubevirt with basic configuration in your environment

Prerequisites

Before we start, make sure you have the following:

1. A Kubernetes cluster (or Docker setup).
2. kubectl installed (for Kubernetes environments).

Step 1: Deploy Kubevirt

export VERSION=$(curl -s https://storage.googleapis.com/kubevirt-prow/release/kubevirt/kubevirt/stable.txt)

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

Step 2: Install CRD

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

Step 3: Verify Components

kubectl get kubevirt.kubevirt.io/kubevirt -n kubevirt -o=jsonpath="{.status.phase}"

kubectl get all -n kubevirt

Step 4: Virtctl

KubeVirt provides an additional binary called virtctl for quick access to the serial and graphical ports of a VM and also handle start/stop operations.

Install

VERSION=$(kubectl get kubevirt.kubevirt.io/kubevirt -n kubevirt -o=jsonpath="{.status.observedKubeVirtVersion}")
ARCH=$(uname -s | tr A-Z a-z)-$(uname -m | sed 's/x86_64/amd64/') || windows-amd64.exe
echo ${ARCH}
curl -L -o virtctl https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/virtctl-${VERSION}-${ARCH}
chmod +x virtctl
sudo install virtctl /usr/local/bin

Install as krew plugin

kubectl krew install virt

Lets Try !!

Create Test VM

Create vm.yaml

apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  name: testvm
spec:
  running: false
  template:
    metadata:
      labels:
        kubevirt.io/size: small
        kubevirt.io/domain: testvm
    spec:
      domain:
        devices:
          disks:
            - name: containerdisk
              disk:
                bus: virtio
            - name: cloudinitdisk
              disk:
                bus: virtio
          interfaces:
          - name: default
            masquerade: {}
        resources:
          requests:
            memory: 64M
      networks:
      - name: default
        pod: {}
      volumes:
        - name: containerdisk
          containerDisk:
            image: quay.io/kubevirt/cirros-container-disk-demo
        - name: cloudinitdisk
          cloudInitNoCloud:
            userDataBase64: SGkuXG4=

Apply vm

kubectl apply -f vm.yaml

Start VM

virtctl start testvm

Check vm status

Console access to

virtctl console testvm

Additional you can install web virt manager to manage by web console

StorageClass

kubevirt-manager controls and manages disks, so a StorageClass is needed in order for the solution to work. allowVolumeExpansion feature needs to be enabled on the StorageClass that you plan to use:

allowVolumeExpansion: true

If you are using hostpath-provisioner or some local storage you may also need:

volumeBindingMode: WaitForFirstConsumer

CDI

Containerized Data Importer is used by kubevirt-manager to control DataVolume operations for Virtual Machines and Virtual Machine Pools:

config:
        featureGates:
        - HonorWaitForFirstConsumer

Install Kubevirt-Manager

kubectl apply -f https://raw.githubusercontent.com/kubevirt-manager/kubevirt-manager/main/kubernetes/bundled.yaml

Access the console

kubectl port-forward svc/kubevirt-manager 8080:8080 -n kubevirt-manager

Its Done !!!

Explore more on https://kubevirt-manager.io/get_started.html and https://kubevirt.io/user-guide/