Change:
}, }, }, <del> expectedDNS: "newdns", </del> <ins> }, { desc:                    "ensurePublicIPExists shall delete DNS from PIP if DNS label is set empty", foundDNSLabelAnnotation: true, existingPIPs: []network.PublicIPAddress{{ Name: to.StringPtr("pip1"), PublicIPAddressPropertiesFormat: &network.PublicIPAddressPropertiesFormat{ DNSSettings: &network.PublicIPAddressDNSSettings{ DomainNameLabel: to.StringPtr("previousdns"), }, }, }}, expectedPIP: &network.PublicIPAddress{ Name: to.StringPtr("pip1"), ID: to.StringPtr("/subscriptions/subscription/resourceGroups/rg" + "/providers/Microsoft.Network/publicIPAddresses/pip1"), PublicIPAddressPropertiesFormat: &network.PublicIPAddressPropertiesFormat{ DNSSettings: nil, }, }, }, { desc:                    "ensurePublicIPExists shall not delete DNS from PIP if DNS label annotation is not set", foundDNSLabelAnnotation: false, existingPIPs: []network.PublicIPAddress{{ Name: to.StringPtr("pip1"), PublicIPAddressPropertiesFormat: &network.PublicIPAddressPropertiesFormat{ DNSSettings: &network.PublicIPAddressDNSSettings{ DomainNameLabel: to.StringPtr("previousdns"), }, }, }}, expectedPIP: &network.PublicIPAddress{ Name: to.StringPtr("pip1"), ID: to.StringPtr("/subscriptions/subscription/resourceGroups/rg" + "/providers/Microsoft.Network/publicIPAddresses/pip1"), PublicIPAddressPropertiesFormat: &network.PublicIPAddressPropertiesFormat{ DNSSettings: &network.PublicIPAddressDNSSettings{ DomainNameLabel: to.StringPtr("previousdns"), }, }, }, </ins> }, }

Discussion:
<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks! If the matter is security related, please disclose it privately via --What happened: After issue is fixed. Cloud provider will automatically reconcile the Azure Public Ip DNS record same as the service annotation. As a result, user finds their DNS record will be deleted if the annotation is not set. Such a change is a block to users who have set the DNS record on their public IP without using this annotation when they upgrade the cluster. Besides, if the public ip is a user's own public ip, it is also not reasonable to delete the DNS record. What you expected to happen: We may need to change the reconcile logic. Maybe only delete the DNS record, when the annotation exists but empty value How to reproduce it (as minimally and precisely as possible): Manually add the DNS label to Azure Public IP resource via Portal Environment: Kubernetes version (use ): 1.15.7 Cloud provider or hardware configuration: Azure
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/sig cloud-provider
/area provider/azure
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/assign
The fix helm install helm-nginx-ingress stable/nginx-ingress  --namespace ingress-nginx-ns  --set controller.replicaCount=2  --set controller.nodeSelector."beta.kubernetes.io/os"=linux  --set controller.service.annotations."service.beta.kubernetes.io/azure-dns-label-name"=MY-AZURE-DNS  --set defaultBackend.nodeSelector."beta.kubernetes.io/os"=linux