A multi-cluster networking operator for Kubernetes on Azure. The project is still under DRAFT status, and please do not use it in production.

• All member clusters should support service annotation service.beta.kubernetes.io/azure-additional-public-ips (requires out-of-tree cloud provider Azure v0.7.5+, v1.0.2+ or above).

Create Azure service principal, assign Contributor role to LoadBalancer and Public IP Address for all member clusters, and then create the following cloud-config file:

{
  "cloud": "AzurePublicCloud",
  "tenantId": "<tenantId>",
  "subscriptionId": "<subscriptionId>",
  "aadClientId": "<aadClientId>",
  "aadClientSecret": "<aadClientSecret>",
  "globalLoadBalancerName": "<glbName>",
  "globalVIPLocation": "<region>",
  "globalLoadBalancerResourceGroup": "<resourceGroup>"
}

Finally, create a secret in MCN cluster (it could be any Kubernetes cluster) based on above config file:

kubectl create secret generic azure-mcn-config --from-file=cloud-config --namespace mcn-system

After secret setup, build the image and deploy the MCN operator in the same MCN cluster:

IMG=<your-image-registry/image-name> make docker-build docker-push
IMG=<your-image-registry/image-name> make deploy

Create AKSCluster from existing kubeconfig file and ClusterSet:

kubectl create secret generic aks-cluster --from-file=kubeconfig

# create AKSCluster
cat <<EOF | kubectl apply -f -
apiVersion: networking.aks.io/v1alpha1
kind: AKSCluster
metadata:
  name: aks-cluster
  namespace: default
spec:
  kubeConfigSecret: aks-cluster
EOF

# create ClusterSet
cat <<EOF | kubectl apply -f -
apiVersion: networking.aks.io/v1alpha1
kind: ClusterSet
metadata:
  name: clusterset-sample
spec:
  clusters: ["aks-cluster"]
EOF

Create a GlobalService and bound it to the above ClusterSet:

cat <<EOF | kubectl apply -f -
apiVersion: networking.aks.io/v1alpha1
kind: GlobalService
metadata:
  name: nginx
  namespace: default
spec:
  clusterSet: clusterset-sample
  ports:
  - name: http
    port: 80
    targetPort: 80
    protocol: TCP
EOF

Then create nginx service in member clusters (the MCN operator assumes the service names and namespaces are same by default in all member clusters):

kubectx aks-cluster
kubectl create deployment nginx --image nginx --save-config
kubectl expose deploy nginx --port=80 --type=LoadBalancer
kubectl get service nginx

Switch kubeconfig back to MCN cluster and then verify the VIP for the global service:

$ kubectl get globalservice
NAME    PORTS   VIP            STATE
nginx   80      x.x.x.x        ACTIVE

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