support multi region cluster

docs/openstack-cloud-controller-manager/using-openstack-cloud-controller-manager.md

@@ -114,6 +114,8 @@ The options in `Global` section are used for openstack-cloud-controller-manager
   Keystone user password. If you are using [Keystone application credential](https://docs.openstack.org/keystone/latest/user/application_credentials.html), this option is not required.
 * `region`
   Required. Keystone region name.
+* `regions`
+  Optional. Keystone region name, witch is used to specify regions for the cloud provider where the instance is running. Region is default region name. Can be specified multiple times.
 * `domain-id`
   Keystone user domain ID. If you are using [Keystone application credential](https://docs.openstack.org/keystone/latest/user/application_credentials.html), this option is not required.
 * `domain-name`
@@ -207,7 +209,7 @@ Although the openstack-cloud-controller-manager was initially implemented with N
     * `ROUND_ROBIN` (default)
     * `LEAST_CONNECTIONS`
     * `SOURCE_IP`
-    
+
   If `lb-provider` is set to "ovn" the value must be set to `SOURCE_IP_PORT`.
 
 * `lb-provider`
@@ -300,7 +302,7 @@ Although the openstack-cloud-controller-manager was initially implemented with N
   call](https://docs.openstack.org/api-ref/load-balancer/v2/?expanded=create-a-load-balancer-detail#creating-a-fully-populated-load-balancer).
   Setting this option to true will create loadbalancers using serial API calls which first create an unpopulated
   loadbalancer, then populate its listeners, pools and members. This is a compatibility option at the expense of
-  increased load on the OpenStack API. Default: false 
+  increased load on the OpenStack API. Default: false
 
 NOTE:
 

pkg/client/client.go

@@ -54,6 +54,7 @@ type AuthOpts struct {
 	UserDomainID     string                   `gcfg:"user-domain-id" mapstructure:"user-domain-id" name:"os-userDomainID" value:"optional"`
 	UserDomainName   string                   `gcfg:"user-domain-name" mapstructure:"user-domain-name" name:"os-userDomainName" value:"optional"`
 	Region           string                   `name:"os-region"`
+	Regions          []string                 `name:"os-regions" value:"optional"`
 	EndpointType     gophercloud.Availability `gcfg:"os-endpoint-type" mapstructure:"os-endpoint-type" name:"os-endpointType" value:"optional"`
 	CAFile           string                   `gcfg:"ca-file" mapstructure:"ca-file" name:"os-certAuthorityPath" value:"optional"`
 	TLSInsecure      string                   `gcfg:"tls-insecure" mapstructure:"tls-insecure" name:"os-TLSInsecure" value:"optional" matches:"^true|false$"`
@@ -88,6 +89,7 @@ func LogCfg(authOpts AuthOpts) {
 	klog.V(5).Infof("UserDomainID: %s", authOpts.UserDomainID)
 	klog.V(5).Infof("UserDomainName: %s", authOpts.UserDomainName)
 	klog.V(5).Infof("Region: %s", authOpts.Region)
+	klog.V(5).Infof("Regions: %s", authOpts.Regions)
 	klog.V(5).Infof("EndpointType: %s", authOpts.EndpointType)
 	klog.V(5).Infof("CAFile: %s", authOpts.CAFile)
 	klog.V(5).Infof("CertFile: %s", authOpts.CertFile)
@@ -233,6 +235,20 @@ func ReadClouds(authOpts *AuthOpts) error {
 	authOpts.ApplicationCredentialName = replaceEmpty(authOpts.ApplicationCredentialName, cloud.AuthInfo.ApplicationCredentialName)
 	authOpts.ApplicationCredentialSecret = replaceEmpty(authOpts.ApplicationCredentialSecret, cloud.AuthInfo.ApplicationCredentialSecret)
 
+	regions := strings.Split(authOpts.Region, ",")
+	if len(regions) > 1 {
+		authOpts.Region = regions[0]
+	}
+
+	for _, r := range cloud.Regions {
+		// Support only single auth section in clouds.yaml
+		if r.Values.AuthInfo == nil && r.Name != authOpts.Region {
+			regions = append(regions, r.Name)
+		}
+	}
+
+	authOpts.Regions = regions
+
 	return nil
 }
 

pkg/openstack/instancesv2.go

@@ -20,6 +20,8 @@ import (
 	"context"
 	"fmt"
 	sysos "os"
+	"slices"
+	"strings"
 
 	"github.com/gophercloud/gophercloud"
 	"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
@@ -33,9 +35,9 @@ import (
 
 // InstancesV2 encapsulates an implementation of InstancesV2 for OpenStack.
 type InstancesV2 struct {
-	compute          *gophercloud.ServiceClient
-	network          *gophercloud.ServiceClient
-	region           string
+	compute          map[string]*gophercloud.ServiceClient
+	network          map[string]*gophercloud.ServiceClient
+	regions          []string
 	regionProviderID bool
 	networkingOpts   NetworkingOpts
 }
@@ -51,16 +53,25 @@ func (os *OpenStack) InstancesV2() (cloudprovider.InstancesV2, bool) {
 func (os *OpenStack) instancesv2() (*InstancesV2, bool) {
 	klog.V(4).Info("openstack.Instancesv2() called")
 
-	compute, err := client.NewComputeV2(os.provider, os.epOpts)
-	if err != nil {
-		klog.Errorf("unable to access compute v2 API : %v", err)
-		return nil, false
-	}
+	var err error
+	compute := make(map[string]*gophercloud.ServiceClient, len(os.regions))
+	network := make(map[string]*gophercloud.ServiceClient, len(os.regions))
 
-	network, err := client.NewNetworkV2(os.provider, os.epOpts)
-	if err != nil {
-		klog.Errorf("unable to access network v2 API : %v", err)
-		return nil, false
+	for _, region := range os.regions {
+		opt := os.epOpts
+		opt.Region = region
+
+		compute[region], err = client.NewComputeV2(os.provider, opt)
+		if err != nil {
+			klog.Errorf("unable to access compute v2 API : %v", err)
+			return nil, false
+		}
+
+		network[region], err = client.NewNetworkV2(os.provider, opt)
+		if err != nil {
+			klog.Errorf("unable to access network v2 API : %v", err)
+			return nil, false
+		}
 	}
 
 	regionalProviderID := false
@@ -71,17 +82,23 @@ func (os *OpenStack) instancesv2() (*InstancesV2, bool) {
 	return &InstancesV2{
 		compute:          compute,
 		network:          network,
-		region:           os.epOpts.Region,
+		regions:          os.regions,
 		regionProviderID: regionalProviderID,
 		networkingOpts:   os.networkingOpts,
 	}, true
 }
 
 // InstanceExists indicates whether a given node exists according to the cloud provider
 func (i *InstancesV2) InstanceExists(ctx context.Context, node *v1.Node) (bool, error) {
-	_, err := i.getInstance(ctx, node)
+	klog.V(4).InfoS("openstack.InstanceExists() called", "node", klog.KObj(node),
+		"providerID", node.Spec.ProviderID,
+		"region", node.Labels[v1.LabelTopologyRegion])
+
+	_, _, err := i.getInstance(ctx, node)
 	if err == cloudprovider.InstanceNotFound {
-		klog.V(6).Infof("instance not found for node: %s", node.Name)
+		klog.V(6).InfoS("Node is not found in cloud provider", "node", klog.KObj(node),
+			"providerID", node.Spec.ProviderID,
+			"region", node.Labels[v1.LabelTopologyRegion])
 		return false, nil
 	}
 
@@ -94,7 +111,11 @@ func (i *InstancesV2) InstanceExists(ctx context.Context, node *v1.Node) (bool,
 
 // InstanceShutdown returns true if the instance is shutdown according to the cloud provider.
 func (i *InstancesV2) InstanceShutdown(ctx context.Context, node *v1.Node) (bool, error) {
-	server, err := i.getInstance(ctx, node)
+	klog.V(4).InfoS("openstack.InstanceShutdown() called", "node", klog.KObj(node),
+		"providerID", node.Spec.ProviderID,
+		"region", node.Labels[v1.LabelTopologyRegion])
+
+	server, _, err := i.getInstance(ctx, node)
 	if err != nil {
 		return false, err
 	}
@@ -109,7 +130,7 @@ func (i *InstancesV2) InstanceShutdown(ctx context.Context, node *v1.Node) (bool
 
 // InstanceMetadata returns the instance's metadata.
 func (i *InstancesV2) InstanceMetadata(ctx context.Context, node *v1.Node) (*cloudprovider.InstanceMetadata, error) {
-	srv, err := i.getInstance(ctx, node)
+	srv, region, err := i.getInstance(ctx, node)
 	if err != nil {
 		return nil, err
 	}
@@ -118,79 +139,124 @@ func (i *InstancesV2) InstanceMetadata(ctx context.Context, node *v1.Node) (*clo
 		server = *srv
 	}
 
-	instanceType, err := srvInstanceType(i.compute, &server.Server)
+	instanceType, err := srvInstanceType(i.compute[region], &server.Server)
 	if err != nil {
 		return nil, err
 	}
 
-	ports, err := getAttachedPorts(i.network, server.ID)
+	ports, err := getAttachedPorts(i.network[region], server.ID)
 	if err != nil {
 		return nil, err
 	}
 
-	addresses, err := nodeAddresses(&server.Server, ports, i.network, i.networkingOpts)
+	addresses, err := nodeAddresses(&server.Server, ports, i.network[region], i.networkingOpts)
 	if err != nil {
 		return nil, err
 	}
 
 	return &cloudprovider.InstanceMetadata{
-		ProviderID:    i.makeInstanceID(&server.Server),
+		ProviderID:    i.makeInstanceID(&server.Server, region),
 		InstanceType:  instanceType,
 		NodeAddresses: addresses,
 		Zone:          server.AvailabilityZone,
-		Region:        i.region,
+		Region:        region,
 	}, nil
 }
 
-func (i *InstancesV2) makeInstanceID(srv *servers.Server) string {
+func (i *InstancesV2) makeInstanceID(srv *servers.Server, region string) string {
 	if i.regionProviderID {
-		return fmt.Sprintf("%s://%s/%s", ProviderName, i.region, srv.ID)
+		return fmt.Sprintf("%s://%s/%s", ProviderName, region, srv.ID)
 	}
 	return fmt.Sprintf("%s:///%s", ProviderName, srv.ID)
 }
 
-func (i *InstancesV2) getInstance(ctx context.Context, node *v1.Node) (*ServerAttributesExt, error) {
-	if node.Spec.ProviderID == "" {
-		opt := servers.ListOpts{
-			Name: fmt.Sprintf("^%s$", node.Name),
+func (i *InstancesV2) getInstance(ctx context.Context, node *v1.Node) (*ServerAttributesExt, string, error) {
+	klog.V(4).InfoS("openstack.getInstance() called", "node", klog.KObj(node),
+		"providerID", node.Spec.ProviderID,
+		"region", node.Labels[v1.LabelTopologyRegion])
+
+	instanceID, instanceRegion, err := instanceIDFromProviderID(node.Spec.ProviderID)
+	if err == nil && instanceRegion != "" {
+		if slices.Contains(i.regions, instanceRegion) {
+			return i.getInstanceByID(instanceID, []string{instanceRegion})
+		}
+
+		return nil, "", fmt.Errorf("getInstance: ProviderID \"%s\" didn't match supported regions \"%s\"", node.Spec.ProviderID, strings.Join(i.regions, ","))
+	}
+
+	// At this point we know that ProviderID is not properly set or it doesn't contain region information
+	// We need to search for the instance in all regions
+	var searchRegions []string
+
+	// We cannot trust the region label, so we need to check the region
+	instanceRegion = node.Labels[v1.LabelTopologyRegion]
+	if slices.Contains(i.regions, instanceRegion) {
+		searchRegions = []string{instanceRegion}
+	}
+
+	for _, r := range i.regions {
+		if r != instanceRegion {
+			searchRegions = append(searchRegions, r)
 		}
-		mc := metrics.NewMetricContext("server", "list")
-		allPages, err := servers.List(i.compute, opt).AllPages()
+	}
+
+	klog.V(6).InfoS("openstack.getInstance() trying to find the instance in regions", "node", klog.KObj(node),
+		"instanceID", instanceID,
+		"regions", strings.Join(searchRegions, ","))
+
+	if instanceID == "" {
+		return i.getInstanceByName(node, searchRegions)
+	}
+
+	return i.getInstanceByID(instanceID, searchRegions)
+}
+
+func (i *InstancesV2) getInstanceByID(instanceID string, searchRegions []string) (*ServerAttributesExt, string, error) {
+	server := ServerAttributesExt{}
+
+	mc := metrics.NewMetricContext("server", "get")
+	for _, r := range searchRegions {
+		err := servers.Get(i.compute[r], instanceID).ExtractInto(&server)
 		if mc.ObserveRequest(err) != nil {
-			return nil, fmt.Errorf("error listing servers %v: %v", opt, err)
+			if errors.IsNotFound(err) {
+				continue
+			}
+
+			return nil, "", err
+		}
+
+		return &server, r, nil
+	}
+
+	return nil, "", cloudprovider.InstanceNotFound
+}
+
+func (i *InstancesV2) getInstanceByName(node *v1.Node, searchRegions []string) (*ServerAttributesExt, string, error) {
+	opt := servers.ListOpts{
+		Name: fmt.Sprintf("^%s$", node.Name),
+	}
+	mc := metrics.NewMetricContext("server", "list")
+	serverList := []ServerAttributesExt{}
+
+	for _, r := range searchRegions {
+		allPages, err := servers.List(i.compute[r], opt).AllPages()
+		if mc.ObserveRequest(err) != nil {
+			return nil, "", fmt.Errorf("error listing servers %v: %v", opt, err)
 		}
 
-		serverList := []ServerAttributesExt{}
 		err = servers.ExtractServersInto(allPages, &serverList)
 		if err != nil {
-			return nil, fmt.Errorf("error extracting servers from pages: %v", err)
+			return nil, "", fmt.Errorf("error extracting servers from pages: %v", err)
 		}
 		if len(serverList) == 0 {
-			return nil, cloudprovider.InstanceNotFound
+			continue
 		}
 		if len(serverList) > 1 {
-			return nil, fmt.Errorf("getInstance: multiple instances found")
+			return nil, "", fmt.Errorf("getInstanceByName: multiple instances found")
 		}
-		return &serverList[0], nil
-	}
-
-	instanceID, instanceRegion, err := instanceIDFromProviderID(node.Spec.ProviderID)
-	if err != nil {
-		return nil, err
-	}
 
-	if instanceRegion != "" && instanceRegion != i.region {
-		return nil, fmt.Errorf("ProviderID \"%s\" didn't match supported region \"%s\"", node.Spec.ProviderID, i.region)
+		return &serverList[0], r, nil
 	}
 
-	server := ServerAttributesExt{}
-	mc := metrics.NewMetricContext("server", "get")
-	err = servers.Get(i.compute, instanceID).ExtractInto(&server)
-	if mc.ObserveRequest(err) != nil {
-		if errors.IsNotFound(err) {
-			return nil, cloudprovider.InstanceNotFound
-		}
-		return nil, err
-	}
-	return &server, nil
+	return nil, "", cloudprovider.InstanceNotFound
 }

pkg/openstack/openstack.go

@@ -37,7 +37,7 @@ import (
 	cloudprovider "k8s.io/cloud-provider"
 	"k8s.io/klog/v2"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	"k8s.io/client-go/informers"
 	coreinformers "k8s.io/client-go/informers/core/v1"
 	"k8s.io/client-go/kubernetes/scheme"
@@ -159,6 +159,7 @@ type ServerAttributesExt struct {
 
 // OpenStack is an implementation of cloud provider Interface for OpenStack.
 type OpenStack struct {
+	regions        []string
 	provider       *gophercloud.ProviderClient
 	epOpts         *gophercloud.EndpointOpts
 	lbOpts         LoadBalancerOpts
@@ -257,6 +258,11 @@ func ReadConfig(config io.Reader) (Config, error) {
 		klog.V(5).Infof("Config, loaded from the %s:", cfg.Global.CloudsFile)
 		client.LogCfg(cfg.Global)
 	}
+
+	if len(cfg.Global.Regions) == 0 {
+		cfg.Global.Regions = []string{cfg.Global.Region}
+	}
+
 	// Set the default values for search order if not set
 	if cfg.Metadata.SearchOrder == "" {
 		cfg.Metadata.SearchOrder = fmt.Sprintf("%s,%s", metadata.ConfigDriveID, metadata.MetadataID)
@@ -309,6 +315,7 @@ func NewOpenStack(cfg Config) (*OpenStack, error) {
 	}
 
 	os := OpenStack{
+		regions:  cfg.Global.Regions,
 		provider: provider,
 		epOpts: &gophercloud.EndpointOpts{
 			Region:       cfg.Global.Region,