Introduction to KubeVirt - Running virtual machines on Kubernetes

Configure KubeVirt

kubectl create -f "https://github.com/kubevirt/kubevirt/releases/download/v1.5.0/kubevirt-operator.yaml"

kubectl create -f "https://github.com/kubevirt/kubevirt/releases/download/v1.5.0/kubevirt-cr.yaml"

Configure CDI

kubectl create -f "https://github.com/kubevirt/containerized-data-importer/releases/download/v1.61.2/cdi-operator.yaml"

kubectl create -f "https://github.com/kubevirt/containerized-data-importer/releases/download/v1.61.2/cdi-cr.yaml"

Install virtctl

curl -L -o virtctl https://github.com/kubevirt/kubevirt/releases/download/v1.5.0/virtctl-v1.5.0-linux-amd64

chmod +x virtctl

cp virtctl ~/.local/bin/

Deploy Normal VM in the cluster

cd normal_vm

1. Create VM

kubectl apply -f vm-normal.yaml

kubectl get vm, vmi
kubectl get pods

2. Access VM (console)

virtctl console ubuntu-focal

(use ubuntu:ubuntu)

3. Access VM (ssh)

Create service:

kubectl apply -f svc-vm-ssh.yaml

Get node IP and port:

kubectl get nodes -o wide
kubectl get svc
kubectl get ep

SSH using the IP and port:

ssh ubuntu@172.18.0.2 -p 31028

4. Check Spec

From VM:

df -h 

free -h

From VM definition:

kubectl get vmi ubuntu-focal -o jsonpath='{.status.memory}'

5. Install nginx

In vm:

sudo apt update
sudo apt install nginx -y

There is not enough space to install anything in the VM.

df -h

5. Stop VM

Use virtctl to stop the VM:

virtctl stop ubuntu-focal

5. Delete VM

kubectl delete -f vm-normal.yaml
kubectl delete -f svc-vm-ssh.yaml

Deploy VM that uses CDI

cd use_cdi

1. Create DataVolume

kubectl apply -f dv-ubuntu-containerdisk.yaml

kubectl get dv

kubectl get pv,pvc    

kubectl get pods
kubectl logs importer-dv-ubuntu-focal -f

2. Create VM that uses DataVolume

kubectl apply -f vm-ubuntu-dv.yaml

kubectl get pods
kubectl get vm, vmi

3. Access VM (ssh)

Create service:

kubectl apply -f svc-vm-ssh.yaml

Get node IP and port:

kubectl get nodes -o wide
kubectl get svc
kubectl get ep

SSH using the IP and port:

ssh ubuntu@172.18.0.2 -p 31028

4. Check spec

From VM:

df -h 

free -h

5. Install nginx in VM and Access it externally

Install nginx in VM:

sudo apt update
sudo apt install nginx -y

sudo systemctl start nginx
sudo systemctl status nginx

curl -I http://localhost:80

Access that nginx externally from client machine:

kubectl get vmi

virtctl port-forward ubuntu-focal 8080:80

curl -I http://localhost:8080

References

• Configure kubevirt: https://kubevirt.io/quickstart_kind/
• Configure CDI: https://kubevirt.io/labs/kubernetes/lab2.html
• Ubuntu container disk images: https://hub.docker.com/r/tedezed/ubuntu-container-disk/tags