How to create Service type LoadBalancer with private ip address from assigned vnet-subnet

Use-case - To expose the service within virtual network as Internal LoadBalancer

By default, when we create service type LoadBalancer without customized annotations in AKS(Azure Kubernetes Service), then AKS will create Load Balancer with Public IP attached to it, through which application can be accessible to internet world.

However, it is possible that we may need to create service to be exposed within virtual network only, however with service type Load Balancer.

For this, we need to add service.beta.kubernetes.io/azure-load-balancer-internal: "true" in annotations in kubernetes service manifest file.

Create an Internal LoadBalancer

            
apiVersion: v1
kind: Service
metadata:
  name: nameOfService
  annotations:
    service.beta.kubernetes.io/azure-load-balancer-internal: "true"
spec:
  type: LoadBalancer
  ports:
  - port: 8080
    targetPort: 8080
  selector:
    app: nameOfApplication               
            
        

Define particular private ip address

For this, we need to add loadBalancerIP in spec with required IP address from the same subnet of AKS.

Ex.

            
apiVersion: v1
kind: Service
metadata:
  name: nameOfService
  annotations:
    service.beta.kubernetes.io/azure-load-balancer-internal: "true"
spec:
  type: LoadBalancer
  loadBalancerIP: 10.10.10.10
  ports:
  - port: 8080
    targetPort: 8080
  selector:
    app: nameOfApplication                 
            
        

Define particular subnet

For this, we need to add service.beta.kubernetes.io/azure-load-balancer-internal-subnet: "subnetName" in annotations

Ex.

            
apiVersion: v1
kind: Service
metadata:
  name: nameOfService
  annotations:
    service.beta.kubernetes.io/azure-load-balancer-internal: "true"
    service.beta.kubernetes.io/azure-load-balancer-internal-subnet: "subnetName"
spec:
  type: LoadBalancer
  loadBalancerIP: 10.10.10.10
  ports:
  - port: 8080
    targetPort: 8080
  selector:
    app: nameOfApplication