feat: add configurable loadbalancer network

Previously when loadbalacer was created it used the same network/subnet as the
control plane nodes for the VIP. This was not always the right assumption as some
users might want to be able to customize this according to their env.

This commit fixes the above by adding two fields into
OpenStackClusterSpec/Status two fields `network` and `subnets` under
`APIServerLoadBalancer` so that user can define which network/subnet
to use for allocation of the loadbalancer.

Fixes: kubernetes-sigs#1809

Signed-off-by: Ondrej Blazek <ondrej.blazek@firma.seznam.cz>

api/v1alpha6/openstackcluster_conversion.go

@@ -203,6 +203,13 @@ func restorev1beta1ClusterSpec(previous *infrav1.OpenStackClusterSpec, dst *infr
 			dst.APIServerLoadBalancer.Enabled = previous.APIServerLoadBalancer.Enabled
 		}
 		optional.RestoreString(&previous.APIServerLoadBalancer.Provider, &dst.APIServerLoadBalancer.Provider)
+
+		if previous.APIServerLoadBalancer.Network != nil {
+			dst.APIServerLoadBalancer.Network = previous.APIServerLoadBalancer.Network
+		}
+		if previous.APIServerLoadBalancer.Subnets != nil {
+			dst.APIServerLoadBalancer.Subnets = previous.APIServerLoadBalancer.Subnets
+		}
 	}
 	if dst.APIServerLoadBalancer.IsZero() {
 		dst.APIServerLoadBalancer = previous.APIServerLoadBalancer
@@ -287,6 +294,21 @@ func Convert_v1alpha6_OpenStackClusterSpec_To_v1beta1_OpenStackClusterSpec(in *O
 	return nil
 }
 
+func Convert_v1beta1_APIServerLoadBalancer_To_v1alpha6_APIServerLoadBalancer(in *infrav1.APIServerLoadBalancer, out *APIServerLoadBalancer, s apiconversion.Scope) error {
+	return autoConvert_v1beta1_APIServerLoadBalancer_To_v1alpha6_APIServerLoadBalancer(in, out, s)
+}
+
+func Convert_v1beta1_LoadBalancer_To_v1alpha6_LoadBalancer(in *infrav1.LoadBalancer, out *LoadBalancer, s apiconversion.Scope) error {
+	return autoConvert_v1beta1_LoadBalancer_To_v1alpha6_LoadBalancer(in, out, s)
+}
+
+func Convert_v1alpha6_APIServerLoadBalancer_To_v1beta1_APIServerLoadBalancer(in *APIServerLoadBalancer, out *infrav1.APIServerLoadBalancer, s apiconversion.Scope) error {
+	err := autoConvert_v1alpha6_APIServerLoadBalancer_To_v1beta1_APIServerLoadBalancer(in, out, s)
+	out.Subnets = nil
+	out.Network = nil
+	return err
+}
+
 func Convert_v1beta1_OpenStackClusterSpec_To_v1alpha6_OpenStackClusterSpec(in *infrav1.OpenStackClusterSpec, out *OpenStackClusterSpec, s apiconversion.Scope) error {
 	err := autoConvert_v1beta1_OpenStackClusterSpec_To_v1alpha6_OpenStackClusterSpec(in, out, s)
 	if err != nil {
@@ -373,6 +395,9 @@ func restorev1beta1ClusterStatus(previous *infrav1.OpenStackClusterStatus, dst *
 	if previous.Bastion != nil && previous.Bastion.DependentResources.Ports != nil {
 		dst.Bastion.DependentResources.Ports = previous.Bastion.DependentResources.Ports
 	}
+	if previous.APIServerLoadBalancer != nil && previous.APIServerLoadBalancer.LoadBalancerNetwork != nil {
+		dst.APIServerLoadBalancer.LoadBalancerNetwork = previous.APIServerLoadBalancer.LoadBalancerNetwork
+	}
 }
 
 func Convert_v1beta1_OpenStackClusterStatus_To_v1alpha6_OpenStackClusterStatus(in *infrav1.OpenStackClusterStatus, out *OpenStackClusterStatus, s apiconversion.Scope) error {
@@ -388,7 +413,16 @@ func Convert_v1beta1_OpenStackClusterStatus_To_v1alpha6_OpenStackClusterStatus(i
 		}
 
 		out.Network.Router = (*Router)(in.Router)
-		out.Network.APIServerLoadBalancer = (*LoadBalancer)(in.APIServerLoadBalancer)
+		if in.APIServerLoadBalancer != nil {
+			out.Network.APIServerLoadBalancer = &LoadBalancer{
+				Name:         in.APIServerLoadBalancer.Name,
+				ID:           in.APIServerLoadBalancer.ID,
+				IP:           in.APIServerLoadBalancer.IP,
+				InternalIP:   in.APIServerLoadBalancer.InternalIP,
+				AllowedCIDRs: in.APIServerLoadBalancer.AllowedCIDRs,
+				Tags:         in.APIServerLoadBalancer.Tags,
+			}
+		}
 	}
 
 	return nil
@@ -403,7 +437,16 @@ func Convert_v1alpha6_OpenStackClusterStatus_To_v1beta1_OpenStackClusterStatus(i
 	// Router and APIServerLoadBalancer have been moved out of Network in v1beta1
 	if in.Network != nil {
 		out.Router = (*infrav1.Router)(in.Network.Router)
-		out.APIServerLoadBalancer = (*infrav1.LoadBalancer)(in.Network.APIServerLoadBalancer)
+		if in.Network.APIServerLoadBalancer != nil {
+			out.APIServerLoadBalancer = &infrav1.LoadBalancer{
+				Name:         in.Network.APIServerLoadBalancer.Name,
+				ID:           in.Network.APIServerLoadBalancer.ID,
+				IP:           in.Network.APIServerLoadBalancer.IP,
+				InternalIP:   in.Network.APIServerLoadBalancer.InternalIP,
+				AllowedCIDRs: in.Network.APIServerLoadBalancer.AllowedCIDRs,
+				Tags:         in.Network.APIServerLoadBalancer.Tags,
+			}
+		}
 	}
 
 	return nil

api/v1alpha7/openstackcluster_conversion.go

@@ -205,6 +205,14 @@ func restorev1beta1ClusterSpec(previous *infrav1.OpenStackClusterSpec, dst *infr
 			dst.APIServerLoadBalancer.Enabled = previous.APIServerLoadBalancer.Enabled
 		}
 		optional.RestoreString(&previous.APIServerLoadBalancer.Provider, &dst.APIServerLoadBalancer.Provider)
+
+		if previous.APIServerLoadBalancer.Network != nil {
+			dst.APIServerLoadBalancer.Network = previous.APIServerLoadBalancer.Network
+		}
+
+		if previous.APIServerLoadBalancer.Subnets != nil {
+			dst.APIServerLoadBalancer.Subnets = previous.APIServerLoadBalancer.Subnets
+		}
 	}
 	if dst.APIServerLoadBalancer.IsZero() {
 		dst.APIServerLoadBalancer = previous.APIServerLoadBalancer
@@ -289,6 +297,21 @@ func Convert_v1alpha7_OpenStackClusterSpec_To_v1beta1_OpenStackClusterSpec(in *O
 	return nil
 }
 
+func Convert_v1beta1_LoadBalancer_To_v1alpha7_LoadBalancer(in *infrav1.LoadBalancer, out *LoadBalancer, s apiconversion.Scope) error {
+	return autoConvert_v1beta1_LoadBalancer_To_v1alpha7_LoadBalancer(in, out, s)
+}
+
+func Convert_v1beta1_APIServerLoadBalancer_To_v1alpha7_APIServerLoadBalancer(in *infrav1.APIServerLoadBalancer, out *APIServerLoadBalancer, s apiconversion.Scope) error {
+	return autoConvert_v1beta1_APIServerLoadBalancer_To_v1alpha7_APIServerLoadBalancer(in, out, s)
+}
+
+func Convert_v1alpha7_APIServerLoadBalancer_To_v1beta1_APIServerLoadBalancer(in *APIServerLoadBalancer, out *infrav1.APIServerLoadBalancer, s apiconversion.Scope) error {
+	err := autoConvert_v1alpha7_APIServerLoadBalancer_To_v1beta1_APIServerLoadBalancer(in, out, s)
+	out.Subnets = nil
+	out.Network = nil
+	return err
+}
+
 func Convert_v1beta1_OpenStackClusterSpec_To_v1alpha7_OpenStackClusterSpec(in *infrav1.OpenStackClusterSpec, out *OpenStackClusterSpec, s apiconversion.Scope) error {
 	err := autoConvert_v1beta1_OpenStackClusterSpec_To_v1alpha7_OpenStackClusterSpec(in, out, s)
 	if err != nil {
@@ -358,6 +381,10 @@ func restorev1beta1ClusterStatus(previous *infrav1.OpenStackClusterStatus, dst *
 	if previous.Bastion != nil && previous.Bastion.DependentResources.Ports != nil {
 		dst.Bastion.DependentResources.Ports = previous.Bastion.DependentResources.Ports
 	}
+
+	if previous.APIServerLoadBalancer != nil && previous.APIServerLoadBalancer.LoadBalancerNetwork != nil {
+		dst.APIServerLoadBalancer.LoadBalancerNetwork = previous.APIServerLoadBalancer.LoadBalancerNetwork
+	}
 }
 
 func Convert_v1beta1_OpenStackClusterStatus_To_v1alpha7_OpenStackClusterStatus(in *infrav1.OpenStackClusterStatus, out *OpenStackClusterStatus, s apiconversion.Scope) error {