kubevirt

Kubevirt

Kubevirt wraps QEMU and provides a Kubernetes-Native way to deploy virtual machines as code.

Manually deploy to ArgoCD

---
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: kubevirt-app-of-apps
  namespace: argocd
  annotations:
    argocd.argoproj.io/sync-wave: "1"
spec:
  project: kubevirt
  destination:
    server: "https://kubernetes.default.svc"
    namespace: kubevirt
  source:
    repoURL: https://github.com/small-hack/argocd-apps.git
    path: kubevirt/
  syncPolicy:
    syncOptions:
      - ApplyOutOfSyncOnly=true
    automated:
      selfHeal: true

Check host features

• Install libvirt-clients

  sudo apt-get install -y libvirt-clients

• Check host config

  virt-host-validate qemu
  QEMU: Checking for hardware virtualization                                 : PASS
  QEMU: Checking if device /dev/kvm exists                                   : PASS
  QEMU: Checking if device /dev/kvm is accessible                            : PASS
  QEMU: Checking if device /dev/vhost-net exists                             : PASS
  QEMU: Checking if device /dev/net/tun exists                               : PASS

Install virtctl

• Install from github

  export VERSION=v0.41.0
  wget https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/virtctl-${VERSION}-linux-amd64

• Install as a krew plugin

  kubectl krew install virt

Software Emulation / Nested virtualization

Enable nested virtualization if desired

kubectl -n kubevirt patch kubevirt kubevirt \
  --type=merge \
  --patch '{"spec":{"configuration":{"developerConfiguration":{"useEmulation":true}}}}'

Uninstalling

export RELEASE=v0.17.0

# --wait=true should anyway be default
kubectl delete -n kubevirt kubevirt kubevirt --wait=true 

# this needs to be deleted to avoid stuck terminating namespaces
kubectl delete apiservices v1.subresources.kubevirt.io 

# not blocking but would be left over
kubectl delete mutatingwebhookconfigurations virt-api-mutator 

# not blocking but would be left over
kubectl delete validatingwebhookconfigurations virt-operator-validator 

# not blocking but would be left over
kubectl delete validatingwebhookconfigurations virt-api-validator 

kubectl delete -f https://github.com/kubevirt/kubevirt/releases/download/${RELEASE}/kubevirt-operator.yaml --wait=false

Using the CDI to manage images

• https://kubevirt.io/2018/containerized-data-importer.html

Metrics

• https://kubevirt.io/user-guide/operations/component_monitoring/
• use the prometheus-helm-chart-kube-prometheus service account created by kube-prometheus-stack
• dashboard: https://grafana.com/grafana/dashboards/11748-kubevirt/