Unikernel-on-K8s

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

Requirements

• xz (sudo apt-get install xz-utils)
• docker
• kind
• kubectl
• Ops
• Virtctl

Build

1. Run and test the image

GOOS=linux go build main.go
ops run -n -p 8083 main

2. Move and put image in format for K8s to understand

cp $HOME/.ops/images/main.img .
xz main.img

3. 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

2. 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

2. 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