No target backends present for the internal load balancer

[feiskyer]

Is this a BUG REPORT or FEATURE REQUEST?:

Uncomment only one, leave it on its own line:

/kind bug

/kind feature

What happened:

When creating an internal loadbalancer, e.g.

cat << EOF | kubectl create -f -
apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  annotations:
    service.beta.kubernetes.io/azure-load-balancer-internal: "true"
spec:
  type: LoadBalancer
  ports:
  - name: http
    port: 80
    targetPort: 80
    protocol: TCP
  - name: https
    port: 443
    targetPort: 443
    protocol: TCP
  selector:
    app: ingress-nginx
EOF

Then wait a while, and no target backends present for the internal load balancer even after 15 mins.

Refer Azure/acs-engine#2151 (comment).

What you expected to happen:

Target backends created for internal load balancers.

How to reproduce it (as minimally and precisely as possible):

Create an internal load balancer and check lb's backends.

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version): 1.9.3
• Cloud provider or hardware configuration: Azure
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: