Don't fail fast if LoadBalancer section is missing

We should allow scenarios where cinder can be used even if the
operator does not want to use the openstack load balancer. So
let's warn in the beginning if subnet-id is missing but fail only
if they try to use the load balancer

pkg/cloudprovider/providers/openstack/openstack.go

@@ -222,7 +222,8 @@ func checkOpenStackOpts(openstackOpts *OpenStack) error {
 
 	// subnet-id is required
 	if len(lbOpts.SubnetId) == 0 {
-		return fmt.Errorf("subnet-id not set in cloud provider config")
+		glog.Warningf("subnet-id not set in cloud provider config. " +
+			"OpenStack Load balancer will not work.")
 	}
 
 	// if need to create health monitor for Neutron LB,

pkg/cloudprovider/providers/openstack/openstack_loadbalancer.go

@@ -589,6 +589,10 @@ func nodeAddressForLB(node *v1.Node) (string, error) {
 func (lbaas *LbaasV2) EnsureLoadBalancer(clusterName string, apiService *v1.Service, nodes []*v1.Node) (*v1.LoadBalancerStatus, error) {
 	glog.V(4).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v, %v, %v)", clusterName, apiService.Namespace, apiService.Name, apiService.Spec.LoadBalancerIP, apiService.Spec.Ports, nodes, apiService.Annotations)
 
+	if len(lbaas.opts.SubnetId) == 0 {
+		return nil, fmt.Errorf("subnet-id not set in cloud provider config")
+	}
+
 	ports := apiService.Spec.Ports
 	if len(ports) == 0 {
 		return nil, fmt.Errorf("no ports provided to openstack load balancer")
@@ -950,6 +954,10 @@ func (lbaas *LbaasV2) UpdateLoadBalancer(clusterName string, service *v1.Service
 	loadBalancerName := cloudprovider.GetLoadBalancerName(service)
 	glog.V(4).Infof("UpdateLoadBalancer(%v, %v, %v)", clusterName, loadBalancerName, nodes)
 
+	if len(lbaas.opts.SubnetId) == 0 {
+		return fmt.Errorf("subnet-id not set in cloud provider config")
+	}
+
 	ports := service.Spec.Ports
 	if len(ports) == 0 {
 		return fmt.Errorf("no ports provided to openstack load balancer")
@@ -1225,6 +1233,10 @@ func (lb *LbaasV1) GetLoadBalancer(clusterName string, service *v1.Service) (*v1
 func (lb *LbaasV1) EnsureLoadBalancer(clusterName string, apiService *v1.Service, nodes []*v1.Node) (*v1.LoadBalancerStatus, error) {
 	glog.V(4).Infof("EnsureLoadBalancer(%v, %v, %v, %v, %v, %v, %v)", clusterName, apiService.Namespace, apiService.Name, apiService.Spec.LoadBalancerIP, apiService.Spec.Ports, nodes, apiService.Annotations)
 
+	if len(lb.opts.SubnetId) == 0 {
+		return nil, fmt.Errorf("subnet-id not set in cloud provider config")
+	}
+
 	ports := apiService.Spec.Ports
 	if len(ports) > 1 {
 		return nil, fmt.Errorf("multiple ports are not supported in openstack v1 load balancers")

pkg/cloudprovider/providers/openstack/openstack_test.go

@@ -188,7 +188,7 @@ func TestCheckOpenStackOpts(t *testing.T) {
 					NodeSecurityGroupID:  "b41d28c2-d02f-4e1e-8ffb-23b8e4f5c144",
 				},
 			},
-			expectedError: fmt.Errorf("subnet-id not set in cloud provider config"),
+			expectedError: nil,
 		},
 		{
 			name: "test3",