Virtualization

Overview

Users requiring virtualization services are speaking to the Virtualization API (Based on the KubeVirt project) which in turn is speaking to the Kubernetes cluster to schedule requested Virtual Machine Instances (VMIs). Scheduling, networking, and storage are all delegated to Kubernetes, while KubeVirt/KVM provides the virtualization functionality.

Deploy a sample VM

The following will simulate a basic ubuntu 22.04 LTS base image deployment.

Download:

curl -O https://cloud-images.ubuntu.com/daily/server/jammy/current/jammy-server-cloudimg-amd64.img

Upload to the internal KOSMOS registry:

curl -v --user atheaadmin:atheaadmin --upload-file jammy-server-cloudimg-amd64.img https://gitea.kosmos.wip/api/packages/athea/generic/ubuntu/22.04/jammy-server-cloudimg-amd64.img

Create a namespace for your VMs:

kubectl apply -f - <<EOF
apiVersion: v1
kind: Namespace
metadata:
  labels:
    pod-security.kubernetes.io/enforce: "privileged"
  name: mytenant-vm
EOF

Create the VM:

kubectl apply -f - <<EOF
apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  labels:
    kubevirt.io/vm: ubuntu
  name: ubuntu
  namespace: mytenant-vm
spec:
  runStrategy: Always
  template:
    metadata:
      labels:
        kubevirt.io/vm: ubuntu
    spec:
      domain:
        devices:
          disks:
          - disk:
              bus: virtio
            name: datavolumedisk1
        resources:
          requests:
            memory: 2048M
            cpu: 2
      volumes:
      - dataVolume:
          name: ubuntu-dv
        name: datavolumedisk1
      - cloudInitNoCloud:
          userData: |-
            #cloud-config
            chpasswd:
              expire: false
            password: kosmos
            user: kosmos
        name: cloudinitdisk
  dataVolumeTemplates:
  - metadata:
      name: ubuntu-dv
    spec:
      storage:
        volumeMode: Block
        resources:
          requests:
            storage: 3Gi
      source:
        http:
          url: http://gitea-http.kosmos-dev-restricted:3000/api/packages/athea/generic/ubuntu/22.04/jammy-server-cloudimg-amd64.img
EOF