Kubernetes : Create Virtual Machine2025/04/25 |
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Create a virtual machine with KubeVirt. This example is based on the environment like follows.
-----------+---------------------------+--------------------------+------------
| | |
eth0|10.0.0.30 eth0|10.0.0.51 eth0|10.0.0.52
+----------+-----------+ +-----------+----------+ +-----------+----------+
| [ dlp.srv.world ] | | [ node01.srv.world ] | | [ node02.srv.world ] |
| Control Plane | | Worker Node | | Worker Node |
+----------------------+ +----------------------+ +----------------------+
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| [1] |
A Persistent storage is needed to store OS images. |
| [2] | Install Containerized Data Importer to store OS images. |
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[root@dlp ~]#
export TAG=$(curl -s -w %{redirect_url} https://github.com/kubevirt/containerized-data-importer/releases/latest) [root@dlp ~]# export VERSION=$(echo ${TAG##*/}) [root@dlp ~]# wget https://github.com/kubevirt/containerized-data-importer/releases/download/${VERSION}/cdi-operator.yaml [root@dlp ~]# wget https://github.com/kubevirt/containerized-data-importer/releases/download/${VERSION}/cdi-cr.yaml
[root@dlp ~]#
vi cdi-cr.yaml
apiVersion: cdi.kubevirt.io/v1beta1
kind: CDI
metadata:
name: cdi
spec:
config:
# add resource section to expand memory limits
podResourceRequirements:
limits:
cpu: '1'
memory: 4Gi
featureGates:
- HonorWaitForFirstConsumer
imagePullPolicy: IfNotPresent
infra:
nodeSelector:
kubernetes.io/os: linux
tolerations:
- key: CriticalAddonsOnly
operator: Exists
workload:
nodeSelector:
kubernetes.io/os: linux
[root@dlp ~]# kubectl apply -f cdi-operator.yaml namespace/cdi created customresourcedefinition.apiextensions.k8s.io/cdis.cdi.kubevirt.io created clusterrole.rbac.authorization.k8s.io/cdi-operator-cluster created clusterrolebinding.rbac.authorization.k8s.io/cdi-operator created serviceaccount/cdi-operator created role.rbac.authorization.k8s.io/cdi-operator created rolebinding.rbac.authorization.k8s.io/cdi-operator created deployment.apps/cdi-operator created
[root@dlp ~]#
kubectl apply -f cdi-cr.yaml cdi.cdi.kubevirt.io/cdi created # after a few minutes, the pods will start up as follows [root@dlp ~]# kubectl get pods -n cdi NAME READY STATUS RESTARTS AGE cdi-apiserver-5bbd7b4df5-pcpnk 1/1 Running 0 119s cdi-deployment-84d584dbdd-f2prq 1/1 Running 0 118s cdi-operator-7cfb4db845-sstql 1/1 Running 0 2m23s cdi-uploadproxy-856554cb9c-tgjpj 1/1 Running 0 118s |
| [3] | Create a virtual machine. On this example, create it with Fedora 42. |
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[root@dlp ~]# kubectl get sc NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE nfs-client cluster.local/nfs-client-nfs-subdir-external-provisioner Delete Immediate true 24m
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: "fedora-pvc"
labels:
app: containerized-data-importer
annotations:
cdi.kubevirt.io/storage.import.endpoint: "https://download.fedoraproject.org/pub/fedora/linux/releases/42/Cloud/x86_64/images/Fedora-Cloud-Base-Generic-42-1.1.x86_64.qcow2"
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 15Gi
storageClassName: nfs-client
[root@dlp ~]#
[root@dlp ~]# kubectl apply -f fedora-pvc.yml persistentvolumeclaim/fedora-pvc created kubectl get pvc NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS VOLUMEATTRIBUTESCLASS AGE fedora-pvc Bound pvc-e14e1de8-34de-4dd1-981d-05dac8b7aa60 15Gi RWO nfs-client <unset> 6s[root@dlp ~]# kubectl get pods NAME READY STATUS RESTARTS AGE importer-fedora-pvc 1/1 Running 0 18s # possible to see importing logs [root@dlp ~]# kubectl logs -f importer-fedora-pvc
.....
.....
I0425 10:43:09.348408 1 data-processor.go:341] Expanding image size to: 15220080640
E0425 10:43:09.364641 1 prlimit.go:156] failed to kill the process; os: process already finished
I0425 10:43:09.364653 1 data-processor.go:253] Validating image
E0425 10:43:09.367771 1 prlimit.go:156] failed to kill the process; os: process already finished
I0425 10:43:09.379900 1 data-processor.go:247] New phase: Complete
I0425 10:43:09.379999 1 importer.go:231] {"scratchSpaceRequired":false,"preallocationApplied":false,"message":"Import Complete"}
# after finishing importing, importer pod will also finish [root@dlp ~]# kubectl get pods No resources found in default namespace.
apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
name: fedora42
labels:
kubevirt.io/os: linux
spec:
runStrategy: Halted
template:
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: fedora-pvc
- cloudInitNoCloud:
userData: |
#cloud-config
hostname: fedora42
ssh_pwauth: true
disable_root: false
chpasswd:
list: |
root:myrootpassword
fedora:userpassword
expire: False
name: cloudinitdisk
[root@dlp ~]#
[root@dlp ~]# kubectl apply -f fedora-vm.yml virtualmachine.kubevirt.io/fedora42 created kubectl get vms NAME AGE STATUS READY fedora42 8s Stopped False[root@dlp ~]# virtctl start fedora42 VM fedora42 was scheduled to start[root@dlp ~]# kubectl get vmi NAME AGE PHASE IP NODENAME READY fedora42 38s Running 192.168.241.142 node02.srv.world True [root@dlp ~]# virtctl console fedora42 Successfully connected to fedora42 console. The escape sequence is ^] fedora42 login: root Password: [root@fedora42 ~]# # to go back to the Host's console, push Ctrl + ] key # * same operation as virsh command [root@dlp ~]# ssh fedora@192.168.241.142 The authenticity of host '192.168.241.142 (192.168.241.142)' can't be established. ED25519 key fingerprint is SHA256:1Wq0hth05ltZ7rmqZT00hiarkJI1YPox+yZES0ThyEM. This key is not known by any other names. Are you sure you want to continue connecting (yes/no/[fingerprint])? yes Warning: Permanently added '192.168.241.142' (ED25519) to the list of known hosts. fedora@192.168.241.142's password: [fedora@fedora42 ~]$ |
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