Merge pull request #16957 from rifelpet/automated-cherry-pick-of-#16948-origin-release-1.30

Automated cherry pick of #16948: openstack: add external dns support

Author: k8s-ci-robot

upup/models/cloudup/resources/addons/external-dns.addons.k8s.io/k8s-1.19.yaml.template

@@ -63,6 +63,10 @@ spec:
           value: "127.0.0.1"
         - name: KUBERNETES_SERVICE_PORT
           value: "443"
+{{ range $name, $value := DNSControllerEnvs }}
+        - name: {{ $name }}
+          value: {{ $value }}
+{{ end }}
         ports:
         - name: http
           protocol: TCP

upup/pkg/fi/cloudup/template_functions.go

@@ -811,6 +811,8 @@ func (tf *TemplateFunctions) ExternalDNSArgv() ([]string, error) {
 	switch cloudProvider {
 	case kops.CloudProviderAWS:
 		argv = append(argv, "--provider=aws")
+	case kops.CloudProviderOpenstack:
+		argv = append(argv, "--provider=designate")
 	case kops.CloudProviderGCE:
 		project := cluster.Spec.CloudProvider.GCE.Project
 		argv = append(argv, "--provider=google")