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Unikernel-on-K8s

Strongly inspired by https://hackernoon.com/running-linux-applications-as-unikernels-with-k8s-gl2p3yfr

Requirements

Build

  1. Run and test the image
GOOS=linux go build main.go
ops run -n -p 8083 main
  1. Move and put image in format for K8s to understand
cp $HOME/.ops/images/main.img .
xz main.img
  1. Upload image to a bucket, CDN or something similar

Installation

K8s cluster

kind create cluster --name unikernel-k8s

KubeVirt

  1. Install
export VERSION=$(curl -s https://api.github.com/repos/kubevirt/kubevirt/releases | grep tag_name | grep -v -- '-rc' | sort -r | head -1 | awk -F': ' '{print $2}' | sed 's/,//' | xargs)
echo $VERSION
kubectl create -f https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-operator.yaml
kubectl create -f https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-cr.yaml
  1. Verify
kubectl get kubevirt.kubevirt.io/kubevirt -n kubevirt -o=jsonpath="{.status.phase}"
kubectl get all -n kubevirt

Containerized Data Importer (CDI)

  1. Install
export VERSION=$(curl -sL https://github.com/kubevirt/containerized-data-importer/releases/latest | grep -o -m1 "v[0-9]\.[0-9]*\.[0-9]*")
kubectl create -f https://github.com/kubevirt/containerized-data-importer/releases/download/$VERSION/cdi-operator.yaml
kubectl create -f https://github.com/kubevirt/containerized-data-importer/releases/download/$VERSION/cdi-cr.yaml
  1. Verify
kubectl get cdi cdi -n cdi
kubectl get pods -n cdi

Disk Image

  1. Update cdi.kubevirt.io/storage.import.endpoint to the URL where the image is stored
  2. Optionally change the name of the PVC by modifying name
  3. kubectl create -f manifests/pvc_main_go.yaml
  4. Check if the storage Pod for the PVC could be created: kubectl get pvc main-go -o jsonpath="{.metadata.annotations.cdi\.kubevirt\.io/storage\.pod\.phase}"

Virtual Machine

  1. Change claimName to the name of the PVC (if modified)
  2. kubectl create -f manifests/vm1_pvc.yaml
  3. Check Phase of Virtual Machine by kubectl get vmi and copy the IP address

Access

  1. SSH into the control-plane of the kind cluster
  2. curl <ip-address>:8083