VMs auf Kubernetes betreiben: Wann KubeVirt für dich die richtige VMware-Alternative ist

# Auf jedem Node, der VMs tragen soll
grep -Ec 'vmx|svm' /proc/cpuinfo
ls -l /dev/kvm

# Ausführlicher Check aus den libvirt-Tools
sudo dnf install -y libvirt-client     # RHEL/Rocky/Alma
sudo apt install -y libvirt-clients    # Debian/Ubuntu
sudo virt-host-validate qemu

KV=$(curl -s https://api.github.com/repos/kubevirt/kubevirt/releases/latest | jq -r .tag_name)
kubectl apply -f https://github.com/kubevirt/kubevirt/releases/download/${KV}/kubevirt-operator.yaml
kubectl apply -f https://github.com/kubevirt/kubevirt/releases/download/${KV}/kubevirt-cr.yaml
kubectl -n kubevirt wait kv kubevirt --for condition=Available --timeout=900s

# Containerized Data Importer für den Disk-Import
CDI=$(curl -s https://api.github.com/repos/kubevirt/containerized-data-importer/releases/latest | jq -r .tag_name)
kubectl apply -f https://github.com/kubevirt/containerized-data-importer/releases/download/${CDI}/cdi-operator.yaml
kubectl apply -f https://github.com/kubevirt/containerized-data-importer/releases/download/${CDI}/cdi-cr.yaml

curl -L -o virtctl \
  https://github.com/kubevirt/kubevirt/releases/download/${KV}/virtctl-${KV}-linux-amd64
sudo install -m 0755 virtctl /usr/local/bin/virtctl
virtctl version

# Welche Nodes dürfen VMs aufnehmen?
kubectl get nodes -l kubevirt.io/schedulable=true

apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: srv01-root
spec:
  source:
    http:
      url: "http://depot.intern.example.com/images/srv01.qcow2"
  storage:
    storageClassName: ceph-rbd
    accessModes:
      - ReadWriteMany
    volumeMode: Block
    resources:
      requests:
        storage: 80Gi

apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: vlan120
spec:
  config: '{
    "cniVersion": "0.3.1",
    "name": "vlan120",
    "type": "bridge",
    "bridge": "br-vlan120",
    "ipam": {}
  }'

spec:
  template:
    spec:
      domain:
        devices:
          interfaces:
            - name: vlan120
              bridge: {}
              macAddress: "52:54:00:1a:2b:3c"
      networks:
        - name: vlan120
          multus:
            networkName: vlan120

# VMware-Tools deinstallieren, qemu-guest-agent installieren
sudo dnf install -y qemu-guest-agent    # RHEL/Rocky/Alma
sudo apt install -y qemu-guest-agent    # Debian/Ubuntu
sudo systemctl enable qemu-guest-agent

# virtio-Treiber müssen in die Initramfs, sonst findet der Kernel die Rootdisk nicht
sudo dracut --regenerate-all --force            # RHEL/Rocky/Alma
sudo update-initramfs -u -k all                 # Debian/Ubuntu

# Kontrolle
lsinitrd | grep -E 'virtio_(blk|scsi|net)'                       # RHEL/Rocky/Alma
lsinitramfs /boot/initrd.img-$(uname -r) | grep -E 'virtio'      # Debian/Ubuntu

# VMDK in qcow2 wandeln, -p zeigt den Fortschritt
qemu-img convert -p -f vmdk -O qcow2 srv01.vmdk srv01.qcow2
qemu-img info srv01.qcow2

# Upload in ein DataVolume, der cdi-uploadproxy muss erreichbar sein
virtctl image-upload dv srv01-root \
  --size=80Gi \
  --storage-class=ceph-rbd \
  --image-path=./srv01.qcow2 \
  --uploadproxy-url=https://cdi-uploadproxy.apps.intern.example.com

virtctl migrate srv01
kubectl get vmim -w                  # VirtualMachineInstanceMigration
kubectl get vmi -o wide              # auf welchem Node läuft die VM jetzt?

virtctl console srv01                # serielle Konsole, Abbruch mit Strg+]
virtctl vnc srv01                    # grafische Konsole
virtctl stop srv01 && virtctl start srv01

apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  name: srv01
spec:
  running: true
  template:
    spec:
      evictionStrategy: LiveMigrate
      domain:
        cpu:
          cores: 4
        memory:
          guest: 8Gi