LB not getting External-IP

A regression was identified creating LoadBalancer services in ARO in new 4.14 clusters (handled for new installations in OCPBUGS-24191)

The same regression has been also confirmed in ARO clusters upgraded to 4.14

4.14.z

On any ARO cluster upgraded to 4.14.z    

    1. Install an ARO cluster
    2. Upgrade to 4.14 from fast channel
    3. oc create svc loadbalancer test-lb -n default --tcp 80:8080

# External-IP stuck in Pending
$ oc get svc test-lb -n default
NAME      TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
test-lb   LoadBalancer   172.30.104.200   <pending>     80:30062/TCP   15m


# Errors in cloud-controller-manager being unable to map VM to nodes
$ oc logs -l infrastructure.openshift.io/cloud-controller-manager=Azure  -n openshift-cloud-controller-manager
I1215 19:34:51.843715       1 azure_loadbalancer.go:1533] reconcileLoadBalancer for service(default/test-lb) - wantLb(true): started
I1215 19:34:51.844474       1 event.go:307] "Event occurred" object="default/test-lb" fieldPath="" kind="Service" apiVersion="v1" type="Normal" reason="EnsuringLoadBalancer" message="Ensuring load balancer"
I1215 19:34:52.253569       1 azure_loadbalancer_repo.go:73] LoadBalancerClient.List(aro-r5iks3dh) success
I1215 19:34:52.253632       1 azure_loadbalancer.go:1557] reconcileLoadBalancer for service(default/test-lb): lb(aro-r5iks3dh/mabad-test-74km6) wantLb(true) resolved load balancer name
I1215 19:34:52.528579       1 azure_vmssflex_cache.go:162] Could not find node () in the existing cache. Forcely freshing the cache to check again...
E1215 19:34:52.714678       1 azure_vmssflex.go:379] fs.GetNodeNameByIPConfigurationID(/subscriptions/fe16a035-e540-4ab7-80d9-373fa9a3d6ae/resourceGroups/aro-r5iks3dh/providers/Microsoft.Network/networkInterfaces/mabad-test-74km6-master0-nic/ipConfigurations/pipConfig) failed. Error: failed to map VM Name to NodeName: VM Name mabad-test-74km6-master-0
E1215 19:34:52.714888       1 azure_loadbalancer.go:126] reconcileLoadBalancer(default/test-lb) failed: failed to map VM Name to NodeName: VM Name mabad-test-74km6-master-0
I1215 19:34:52.714956       1 azure_metrics.go:115] "Observed Request Latency" latency_seconds=0.871261893 request="services_ensure_loadbalancer" resource_group="aro-r5iks3dh" subscription_id="fe16a035-e540-4ab7-80d9-373fa9a3d6ae" source="default/test-lb" result_code="failed_ensure_loadbalancer"
E1215 19:34:52.715005       1 controller.go:291] error processing service default/test-lb (will retry): failed to ensure load balancer: failed to map VM Name to NodeName: VM Name mabad-test-74km6-master-0

# The LoadBalancer gets an External-IP assigned
$ oc get svc test-lb -n default 
NAME         TYPE           CLUSTER-IP       EXTERNAL-IP                            PORT(S)        AGE 
test-lb      LoadBalancer   172.30.193.159   20.242.180.199                         80:31475/TCP   14s

In cloud-provider-config cm in openshift-config namespace, vmType=""

When vmType gets changed to "standard" explicitly, the provisioning of the LoadBalancer completes and an ExternalIP gets assigned without errors.