🐛 Fix Provisioning to Unavailable AZs

api/v1alpha6/openstackcluster_webhook.go

@@ -115,6 +115,10 @@ func (r *OpenStackCluster) ValidateUpdate(oldRaw runtime.Object) error {
 		r.Spec.APIServerLoadBalancer.AllowedCIDRs = []string{}
 	}
 
+	// Allow changes to the availability zones.
+	old.Spec.ControlPlaneAvailabilityZones = []string{}
+	r.Spec.ControlPlaneAvailabilityZones = []string{}
+
 	if !reflect.DeepEqual(old.Spec, r.Spec) {
 		allErrs = append(allErrs, field.Forbidden(field.NewPath("spec"), "cannot be modified"))
 	}

api/v1alpha6/openstackcluster_webhook_test.go

@@ -175,6 +175,65 @@ func TestOpenStackCluster_ValidateUpdate(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "Adding OpenStackCluster.Spec.ControlPlaneAvailabilityZones is allowed",
+			oldTemplate: &OpenStackCluster{
+				Spec: OpenStackClusterSpec{
+					CloudName: "foobar",
+				},
+			},
+			newTemplate: &OpenStackCluster{
+				Spec: OpenStackClusterSpec{
+					CloudName: "foobar",
+					ControlPlaneAvailabilityZones: []string{
+						"alice",
+						"bob",
+					},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "Modifying OpenStackCluster.Spec.ControlPlaneAvailabilityZones is allowed",
+			oldTemplate: &OpenStackCluster{
+				Spec: OpenStackClusterSpec{
+					CloudName: "foobar",
+					ControlPlaneAvailabilityZones: []string{
+						"alice",
+						"bob",
+					},
+				},
+			},
+			newTemplate: &OpenStackCluster{
+				Spec: OpenStackClusterSpec{
+					CloudName: "foobar",
+					ControlPlaneAvailabilityZones: []string{
+						"alice",
+						"bob",
+						"eve",
+					},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "Removing OpenStackCluster.Spec.ControlPlaneAvailabilityZones is allowed",
+			oldTemplate: &OpenStackCluster{
+				Spec: OpenStackClusterSpec{
+					CloudName: "foobar",
+					ControlPlaneAvailabilityZones: []string{
+						"alice",
+						"bob",
+					},
+				},
+			},
+			newTemplate: &OpenStackCluster{
+				Spec: OpenStackClusterSpec{
+					CloudName: "foobar",
+				},
+			},
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

pkg/cloud/services/compute/availabilityzone.go

@@ -28,5 +28,13 @@ func (s *Service) GetAvailabilityZones() ([]availabilityzones.AvailabilityZone,
 		return nil, fmt.Errorf("error extracting availability zone list: %v", err)
 	}
 
-	return availabilityZoneList, nil
+	available := make([]availabilityzones.AvailabilityZone, 0, len(availabilityZoneList))
+
+	for _, az := range availabilityZoneList {
+		if az.ZoneState.Available {
+			available = append(available, az)
+		}
+	}
+
+	return available, nil
 }