[Feature] [Gateway] Dynamic Configuration (#1718)

CHANGELOG.md

@@ -26,6 +26,7 @@
 - (Feature) (Gateway) ArangoDB JWT Auth Integration
 - (Feature) Scheduler Handler
 - (Feature) (Gateway) ArangoDB Auth Token
+- (Feature) (Gateway) Dynamic Configuration
 
 ## [1.2.42](https://github.com/arangodb/kube-arangodb/tree/1.2.42) (2024-07-23)
 - (Maintenance) Go 1.22.4 & Kubernetes 1.29.6 libraries

docs/api/ArangoDeployment.V1.md

@@ -3043,6 +3043,17 @@ Type: `boolean` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.
 
 ***
 
+### .spec.gateway.dynamic
+
+Type: `boolean` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.42/pkg/apis/deployment/v1/deployment_spec_gateway.go#L38)</sup>
+
+Dynamic setting enables/disables support dynamic configuration of the gateway in the cluster.
+When enabled, gateway config will be reloaded by ConfigMap live updates.
+
+Default Value: `false`
+
+***
+
 ### .spec.gateway.enabled
 
 Type: `boolean` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.42/pkg/apis/deployment/v1/deployment_spec_gateway.go#L33)</sup>
@@ -3056,7 +3067,7 @@ Default Value: `false`
 
 ### .spec.gateway.image
 
-Type: `string` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.42/pkg/apis/deployment/v1/deployment_spec_gateway.go#L37)</sup>
+Type: `string` <sup>[\[ref\]](https://github.com/arangodb/kube-arangodb/blob/1.2.42/pkg/apis/deployment/v1/deployment_spec_gateway.go#L42)</sup>
 
 Image is the image to use for the gateway.
 By default, the image is determined by the operator.

pkg/apis/deployment/v1/deployment_spec_gateway.go

@@ -32,6 +32,11 @@ type DeploymentSpecGateway struct {
 	// +doc/default: false
 	Enabled *bool `json:"enabled,omitempty"`
 
+	// Dynamic setting enables/disables support dynamic configuration of the gateway in the cluster.
+	// When enabled, gateway config will be reloaded by ConfigMap live updates.
+	// +doc/default: false
+	Dynamic *bool `json:"dynamic,omitempty"`
+
 	// Image is the image to use for the gateway.
 	// By default, the image is determined by the operator.
 	Image *string `json:"image"`
@@ -49,6 +54,15 @@ func (d *DeploymentSpecGateway) IsEnabled() bool {
 	return *d.Enabled
 }
 
+// IsDynamic returns whether the gateway dynamic config is enabled.
+func (d *DeploymentSpecGateway) IsDynamic() bool {
+	if d == nil || d.Dynamic == nil {
+		return false
+	}
+
+	return *d.Dynamic
+}
+
 func (d *DeploymentSpecGateway) GetSidecar() *schedulerApi.IntegrationSidecar {
 	if d == nil || d.Sidecar == nil {
 		return nil

pkg/apis/deployment/v1/zz_generated.deepcopy.go

@@ -1180,6 +1180,11 @@ func (in *DeploymentSpecGateway) DeepCopyInto(out *DeploymentSpecGateway) {
 		*out = new(bool)
 		**out = **in
 	}
+	if in.Dynamic != nil {
+		in, out := &in.Dynamic, &out.Dynamic
+		*out = new(bool)
+		**out = **in
+	}
 	if in.Image != nil {
 		in, out := &in.Image, &out.Image
 		*out = new(string)

pkg/apis/deployment/v2alpha1/deployment_spec_gateway.go

@@ -32,6 +32,11 @@ type DeploymentSpecGateway struct {
 	// +doc/default: false
 	Enabled *bool `json:"enabled,omitempty"`
 
+	// Dynamic setting enables/disables support dynamic configuration of the gateway in the cluster.
+	// When enabled, gateway config will be reloaded by ConfigMap live updates.
+	// +doc/default: false
+	Dynamic *bool `json:"dynamic,omitempty"`
+
 	// Image is the image to use for the gateway.
 	// By default, the image is determined by the operator.
 	Image *string `json:"image"`
@@ -49,6 +54,15 @@ func (d *DeploymentSpecGateway) IsEnabled() bool {
 	return *d.Enabled
 }
 
+// IsDynamic returns whether the gateway dynamic config is enabled.
+func (d *DeploymentSpecGateway) IsDynamic() bool {
+	if d == nil || d.Dynamic == nil {
+		return false
+	}
+
+	return *d.Dynamic
+}
+
 func (d *DeploymentSpecGateway) GetSidecar() *schedulerApi.IntegrationSidecar {
 	if d == nil || d.Sidecar == nil {
 		return nil

pkg/apis/deployment/v2alpha1/zz_generated.deepcopy.go

@@ -1180,6 +1180,11 @@ func (in *DeploymentSpecGateway) DeepCopyInto(out *DeploymentSpecGateway) {
 		*out = new(bool)
 		**out = **in
 	}
+	if in.Dynamic != nil {
+		in, out := &in.Dynamic, &out.Dynamic
+		*out = new(bool)
+		**out = **in
+	}
 	if in.Image != nil {
 		in, out := &in.Image, &out.Image
 		*out = new(string)

pkg/crd/crds/database-deployment.schema.generated.yaml

@@ -6567,6 +6567,11 @@ v1:
           gateway:
             description: Gateway defined main Gateway configuration.
             properties:
+              dynamic:
+                description: |-
+                  Dynamic setting enables/disables support dynamic configuration of the gateway in the cluster.
+                  When enabled, gateway config will be reloaded by ConfigMap live updates.
+                type: boolean
               enabled:
                 description: |-
                   Enabled setting enables/disables support for gateway in the cluster.
@@ -23084,6 +23089,11 @@ v1alpha:
           gateway:
             description: Gateway defined main Gateway configuration.
             properties:
+              dynamic:
+                description: |-
+                  Dynamic setting enables/disables support dynamic configuration of the gateway in the cluster.
+                  When enabled, gateway config will be reloaded by ConfigMap live updates.
+                type: boolean
               enabled:
                 description: |-
                   Enabled setting enables/disables support for gateway in the cluster.

pkg/deployment/resources/config_map_gateway.go

@@ -55,7 +55,26 @@ func (r *Resources) ensureGatewayConfig(ctx context.Context, cachedStatus inspec
 		return errors.WithStack(errors.Wrapf(err, "Failed to generate gateway config"))
 	}
 
-	gatewayCfgYaml, gatewayCfgChecksum, _, err := cfg.RenderYAML()
+	gatewayCfgYaml, _, _, err := cfg.RenderYAML()
+	if err != nil {
+		return errors.WithStack(errors.Wrapf(err, "Failed to render gateway config"))
+	}
+
+	gatewayCfgCDSYaml, _, _, err := cfg.RenderCDSYAML()
+	if err != nil {
+		return errors.WithStack(errors.Wrapf(err, "Failed to render gateway cds config"))
+	}
+
+	gatewayCfgLDSYaml, _, _, err := cfg.RenderLDSYAML()
+	if err != nil {
+		return errors.WithStack(errors.Wrapf(err, "Failed to render gateway lds config"))
+	}
+
+	elements, err := r.renderConfigMap(map[string]string{
+		GatewayConfigFileName:    string(gatewayCfgYaml),
+		GatewayCDSConfigFileName: string(gatewayCfgCDSYaml),
+		GatewayLDSConfigFileName: string(gatewayCfgLDSYaml),
+	})
 	if err != nil {
 		return errors.WithStack(errors.Wrapf(err, "Failed to render gateway config"))
 	}
@@ -66,10 +85,7 @@ func (r *Resources) ensureGatewayConfig(ctx context.Context, cachedStatus inspec
 			ObjectMeta: meta.ObjectMeta{
 				Name: configMapName,
 			},
-			Data: map[string]string{
-				GatewayConfigFileName:         string(gatewayCfgYaml),
-				GatewayConfigChecksumFileName: gatewayCfgChecksum,
-			},
+			Data: elements,
 		}
 
 		owner := r.context.GetAPIObject().AsOwner()
@@ -88,17 +104,14 @@ func (r *Resources) ensureGatewayConfig(ctx context.Context, cachedStatus inspec
 		return errors.Reconcile()
 	} else {
 		// CM Exists, checks checksum - if key is not in the map we return empty string
-		if existingSha, existingChecksumSha := util.SHA256FromString(cm.Data[GatewayConfigFileName]), cm.Data[GatewayConfigChecksumFileName]; existingSha != gatewayCfgChecksum || existingChecksumSha != gatewayCfgChecksum {
+		if currentSha, expectedSha := util.Optional(cm.Data, ConfigMapChecksumKey, ""), util.Optional(elements, ConfigMapChecksumKey, ""); currentSha != expectedSha || currentSha == "" {
 			// We need to do the update
 			if _, changed, err := patcher.Patcher[*core.ConfigMap](ctx, cachedStatus.ConfigMapsModInterface().V1(), cm, meta.PatchOptions{},
-				patcher.PatchConfigMapData(map[string]string{
-					GatewayConfigFileName:         string(gatewayCfgYaml),
-					GatewayConfigChecksumFileName: gatewayCfgChecksum,
-				})); err != nil {
+				patcher.PatchConfigMapData(elements)); err != nil {
 				log.Err(err).Debug("Failed to patch GatewayConfig ConfigMap")
 				return errors.WithStack(err)
 			} else if changed {
-				log.Str("service", cm.GetName()).Str("before", existingSha).Str("after", gatewayCfgChecksum).Info("Updated GatewayConfig")
+				log.Str("configmap", cm.GetName()).Str("before", currentSha).Str("after", expectedSha).Info("Updated GatewayConfig")
 			}
 		}
 	}

pkg/deployment/resources/config_map_gateway_member.go

@@ -0,0 +1,50 @@
+//
+// DISCLAIMER
+//
+// Copyright 2024 ArangoDB GmbH, Cologne, Germany
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+
+package resources
+
+import (
+	"context"
+
+	api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1"
+	"github.com/arangodb/kube-arangodb/pkg/deployment/resources/gateway"
+	inspectorInterface "github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector"
+)
+
+func (r *Resources) ensureMemberConfigGatewayConfig(ctx context.Context, cachedStatus inspectorInterface.Inspector, member api.DeploymentStatusMemberElement) (map[string]string, error) {
+	if member.Group != api.ServerGroupGateways {
+		return nil, nil
+	}
+
+	data, _, _, err := gateway.NodeDynamicConfig("arangodb", member.Member.ID, &gateway.DynamicConfig{
+		Path: GatewayVolumeMountDir,
+		File: GatewayCDSConfigFileName,
+	}, &gateway.DynamicConfig{
+		Path: GatewayVolumeMountDir,
+		File: GatewayLDSConfigFileName,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return map[string]string{
+		GatewayDynamicConfigFileName: string(data),
+	}, nil
+}

pkg/deployment/resources/config_maps.go

@@ -54,6 +54,9 @@ func (r *Resources) EnsureConfigMaps(ctx context.Context, cachedStatus inspector
 		if err := reconcileRequired.WithError(r.ensureGatewayConfig(ctx, cachedStatus, configMaps)); err != nil {
 			return errors.Section(err, "Gateway ConfigMap")
 		}
+		if err := reconcileRequired.WithError(r.ensureMemberConfig(ctx, cachedStatus, configMaps)); err != nil {
+			return errors.Section(err, "Member ConfigMap")
+		}
 	}
 	return reconcileRequired.Reconcile(ctx)
 }

pkg/deployment/resources/config_maps_member.go

@@ -0,0 +1,172 @@
+//
+// DISCLAIMER
+//
+// Copyright 2024 ArangoDB GmbH, Cologne, Germany
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+
+package resources
+
+import (
+	"context"
+
+	core "k8s.io/api/core/v1"
+	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1"
+	"github.com/arangodb/kube-arangodb/pkg/util"
+	"github.com/arangodb/kube-arangodb/pkg/util/assertion"
+	"github.com/arangodb/kube-arangodb/pkg/util/errors"
+	"github.com/arangodb/kube-arangodb/pkg/util/globals"
+	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
+	inspectorInterface "github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector"
+	configMapsV1 "github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector/configmap/v1"
+	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil/kerrors"
+	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil/patcher"
+)
+
+const (
+	ConfigMapChecksumKey = "CHECKSUM"
+
+	MemberConfigVolumeMountDir = "/etc/member/"
+	MemberConfigVolumeName     = "member-config"
+
+	MemberConfigChecksumENV = "MEMBER_CONFIG_CHECKSUM"
+)
+
+type memberConfigMapRenderer func(ctx context.Context, cachedStatus inspectorInterface.Inspector, member api.DeploymentStatusMemberElement) (map[string]string, error)
+
+func (r *Resources) ensureMemberConfig(ctx context.Context, cachedStatus inspectorInterface.Inspector, configMaps configMapsV1.ModInterface) error {
+	status := r.context.GetStatus()
+
+	log := r.log.Str("section", "member-config-render")
+
+	reconcileRequired := k8sutil.NewReconcile(cachedStatus)
+
+	members := status.Members.AsList()
+
+	if err := reconcileRequired.ParallelAll(len(members), func(id int) error {
+		memberName := members[id].Member.ArangoMemberName(r.context.GetAPIObject().GetName(), members[id].Group)
+
+		am, ok := cachedStatus.ArangoMember().V1().GetSimple(memberName)
+		if !ok {
+			return errors.Errorf("ArangoMember %s not found", memberName)
+		}
+
+		switch members[id].Group.Type() {
+		case api.ServerGroupTypeGateway, api.ServerGroupTypeArangoSync, api.ServerGroupTypeArangoD:
+			elements, err := r.renderMemberConfigElements(ctx, cachedStatus, members[id], r.ensureMemberConfigGatewayConfig)
+			if err != nil {
+				return err
+			}
+
+			if len(elements) == 0 {
+				// CM should be gone
+				if obj, ok := cachedStatus.ConfigMap().V1().GetSimple(memberName); !ok {
+					return nil
+				} else {
+					if err := cachedStatus.ConfigMapsModInterface().V1().Delete(ctx, memberName, meta.DeleteOptions{
+						Preconditions: meta.NewUIDPreconditions(string(obj.GetUID())),
+					}); err != nil {
+						if !kerrors.IsNotFound(err) {
+							return err
+						}
+					}
+				}
+			} else {
+				// We expect CM
+				if obj, ok := cachedStatus.ConfigMap().V1().GetSimple(memberName); !ok {
+					// Let's Create ConfigMap
+					obj = &core.ConfigMap{
+						ObjectMeta: meta.ObjectMeta{
+							Name: memberName,
+						},
+						Data: elements,
+					}
+
+					err = globals.GetGlobalTimeouts().Kubernetes().RunWithTimeout(ctx, func(ctxChild context.Context) error {
+						return k8sutil.CreateConfigMap(ctxChild, configMaps, obj, util.NewType(am.AsOwner()))
+					})
+					if kerrors.IsAlreadyExists(err) {
+						// CM added while we tried it also
+						return nil
+					} else if err != nil {
+						// Failed to create
+						return errors.WithStack(err)
+					}
+
+					return errors.Reconcile()
+				} else {
+					// CM Exists, checks checksum - if key is not in the map we return empty string
+					if currentSha, expectedSha := util.Optional(obj.Data, ConfigMapChecksumKey, ""), util.Optional(elements, ConfigMapChecksumKey, ""); currentSha != expectedSha || currentSha == "" {
+						// We need to do the update
+						if _, changed, err := patcher.Patcher[*core.ConfigMap](ctx, cachedStatus.ConfigMapsModInterface().V1(), obj, meta.PatchOptions{},
+							patcher.PatchConfigMapData(elements)); err != nil {
+							log.Err(err).Debug("Failed to patch GatewayConfig ConfigMap")
+							return errors.WithStack(err)
+						} else if changed {
+							log.Str("service", obj.GetName()).Str("before", currentSha).Str("after", expectedSha).Info("Updated Member Config")
+						}
+					}
+				}
+			}
+			return nil
+		default:
+			assertion.InvalidGroupKey.Assert(true, "Unable to create Member ConfigMap an unknown group: %s", members[id].Group.AsRole())
+			return nil
+		}
+	}); err != nil {
+		return errors.Section(err, "Member ConfigMap")
+	}
+
+	return nil
+}
+
+func (r *Resources) renderConfigMap(elements ...map[string]string) (map[string]string, error) {
+	result := map[string]string{}
+
+	for _, r := range elements {
+		for k, v := range r {
+			if _, ok := result[k]; ok {
+				return nil, errors.Errorf("Key %s already defined", k)
+			}
+
+			result[k] = v
+		}
+	}
+
+	if len(result) == 0 {
+		return nil, nil
+	}
+
+	result[ConfigMapChecksumKey] = util.SHA256FromStringMap(result)
+
+	return result, nil
+}
+
+func (r *Resources) renderMemberConfigElements(ctx context.Context, cachedStatus inspectorInterface.Inspector, member api.DeploymentStatusMemberElement, renders ...memberConfigMapRenderer) (map[string]string, error) {
+	var elements = make([]map[string]string, len(renders))
+
+	for _, r := range renders {
+		if els, err := r(ctx, cachedStatus, member); err != nil {
+			return nil, errors.Wrapf(err, "Unable to render CM for %s", member.Member.ID)
+		} else {
+			elements = append(elements, els)
+		}
+	}
+
+	return r.renderConfigMap(elements...)
+}

pkg/deployment/resources/gateway/dynamic.go

@@ -0,0 +1,93 @@
+//
+// DISCLAIMER
+//
+// Copyright 2024 ArangoDB GmbH, Cologne, Germany
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+
+package gateway
+
+import (
+	"path"
+
+	bootstrapAPI "github.com/envoyproxy/go-control-plane/envoy/config/bootstrap/v3"
+	coreAPI "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
+	discoveryApi "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
+	proto "google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/anypb"
+)
+
+type DynamicConfig struct {
+	Path, File string
+}
+
+func (d *DynamicConfig) AsConfigSource() *coreAPI.ConfigSource {
+	if d == nil {
+		return nil
+	}
+
+	return &coreAPI.ConfigSource{
+		ConfigSourceSpecifier: &coreAPI.ConfigSource_PathConfigSource{
+			PathConfigSource: &coreAPI.PathConfigSource{
+				Path: path.Join(d.Path, d.File),
+				WatchedDirectory: &coreAPI.WatchedDirectory{
+					Path: d.Path,
+				},
+			},
+		},
+	}
+}
+
+func NodeDynamicConfig(cluster, id string, cds, lds *DynamicConfig) ([]byte, string, *bootstrapAPI.Bootstrap, error) {
+	var b = bootstrapAPI.Bootstrap{
+		Node: &coreAPI.Node{
+			Id:      id,
+			Cluster: cluster,
+		},
+	}
+
+	if v := cds; v != nil {
+		if b.DynamicResources == nil {
+			b.DynamicResources = &bootstrapAPI.Bootstrap_DynamicResources{}
+		}
+
+		b.DynamicResources.CdsConfig = v.AsConfigSource()
+	}
+
+	if v := lds; v != nil {
+		if b.DynamicResources == nil {
+			b.DynamicResources = &bootstrapAPI.Bootstrap_DynamicResources{}
+		}
+
+		b.DynamicResources.LdsConfig = v.AsConfigSource()
+	}
+
+	return Marshal(&b)
+}
+
+func DynamicConfigResponse[T proto.Message](in ...T) (*discoveryApi.DiscoveryResponse, error) {
+	resources := make([]*anypb.Any, len(in))
+	for id := range in {
+		if a, err := anypb.New(in[id]); err != nil {
+			return nil, err
+		} else {
+			resources[id] = a
+		}
+	}
+	return &discoveryApi.DiscoveryResponse{
+		Resources: resources,
+	}, nil
+}

pkg/deployment/resources/gateway/gateway_config.go

@@ -36,11 +36,11 @@ import (
 	tlsInspectorApi "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/listener/tls_inspector/v3"
 	httpConnectionManagerAPI "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/http_connection_manager/v3"
 	upstreamHttpApi "github.com/envoyproxy/go-control-plane/envoy/extensions/upstreams/http/v3"
+	discoveryApi "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
 	"github.com/golang/protobuf/ptypes/any"
-	"google.golang.org/protobuf/encoding/protojson"
+	"github.com/golang/protobuf/ptypes/wrappers"
 	"google.golang.org/protobuf/types/known/anypb"
 	"google.golang.org/protobuf/types/known/durationpb"
-	"sigs.k8s.io/yaml"
 
 	shared "github.com/arangodb/kube-arangodb/pkg/apis/shared"
 	"github.com/arangodb/kube-arangodb/pkg/util"
@@ -74,15 +74,51 @@ func (c Config) RenderYAML() ([]byte, string, *bootstrapAPI.Bootstrap, error) {
 		return nil, "", nil, err
 	}
 
-	data, err := protojson.MarshalOptions{
-		UseProtoNames: true,
-	}.Marshal(cfg)
+	return Marshal(cfg)
+}
+
+func (c Config) RenderCDSYAML() ([]byte, string, *discoveryApi.DiscoveryResponse, error) {
+	cfg, err := c.RenderCDS()
 	if err != nil {
 		return nil, "", nil, err
 	}
 
-	data, err = yaml.JSONToYAML(data)
-	return data, util.SHA256(data), cfg, err
+	return Marshal(cfg)
+}
+
+func (c Config) RenderLDSYAML() ([]byte, string, *discoveryApi.DiscoveryResponse, error) {
+	cfg, err := c.RenderLDS()
+	if err != nil {
+		return nil, "", nil, err
+	}
+
+	return Marshal(cfg)
+}
+
+func (c Config) RenderCDS() (*discoveryApi.DiscoveryResponse, error) {
+	if err := c.Validate(); err != nil {
+		return nil, errors.Wrapf(err, "Validation failed")
+	}
+
+	clusters, err := c.RenderClusters()
+	if err != nil {
+		return nil, errors.Wrapf(err, "Unable to render clusters")
+	}
+
+	return DynamicConfigResponse(clusters...)
+}
+
+func (c Config) RenderLDS() (*discoveryApi.DiscoveryResponse, error) {
+	if err := c.Validate(); err != nil {
+		return nil, errors.Wrapf(err, "Validation failed")
+	}
+
+	listener, err := c.RenderListener()
+	if err != nil {
+		return nil, errors.Wrapf(err, "Unable to render listener")
+	}
+
+	return DynamicConfigResponse(listener)
 }
 
 func (c Config) Render() (*bootstrapAPI.Bootstrap, error) {
@@ -268,6 +304,9 @@ func (c Config) RenderFilters() ([]*listenerAPI.Filter, error) {
 						Routes:  routes,
 					},
 				},
+				ValidateClusters: &wrappers.BoolValue{
+					Value: false,
+				},
 			},
 		},
 		HttpFilters: append(httpFilters, &httpConnectionManagerAPI.HttpFilter{

pkg/deployment/resources/gateway/marshal.go

@@ -0,0 +1,41 @@
+//
+// DISCLAIMER
+//
+// Copyright 2024 ArangoDB GmbH, Cologne, Germany
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+
+package gateway
+
+import (
+	"google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
+	"sigs.k8s.io/yaml"
+
+	"github.com/arangodb/kube-arangodb/pkg/util"
+)
+
+func Marshal[T proto.Message](in T) ([]byte, string, T, error) {
+	data, err := protojson.MarshalOptions{
+		UseProtoNames: true,
+	}.Marshal(in)
+	if err != nil {
+		return nil, "", util.Default[T](), err
+	}
+
+	data, err = yaml.JSONToYAML(data)
+	return data, util.SHA256(data), in, err
+}

pkg/deployment/resources/pod_creator.go

@@ -26,6 +26,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net"
+	"path"
 	"path/filepath"
 	"strconv"
 	"sync"
@@ -288,7 +289,11 @@ func createArangoSyncArgs(apiObject meta.Object, spec api.DeploymentSpec, group
 
 func createArangoGatewayArgs(input pod.Input, additionalOptions ...k8sutil.OptionPair) []string {
 	options := k8sutil.CreateOptionPairs(64)
-	options.Add("--config-path", GatewayConfigFilePath)
+	if input.Deployment.Gateway.IsDynamic() {
+		options.Add("--config-path", path.Join(MemberConfigVolumeMountDir, GatewayDynamicConfigFileName))
+	} else {
+		options.Add("--config-path", path.Join(GatewayVolumeMountDir, GatewayConfigFileName))
+	}
 
 	options.Append(additionalOptions...)
 

pkg/deployment/resources/pod_creator_gateway.go

@@ -30,13 +30,14 @@ import (
 )
 
 const (
-	ArangoGatewayExecutor         string = "/usr/local/bin/envoy"
+	ArangoGatewayExecutor        = "/usr/local/bin/envoy"
 	GatewayVolumeMountDir        = "/etc/gateway/"
 	GatewayVolumeName            = "gateway"
 	GatewayConfigFileName        = "gateway.yaml"
-	GatewayConfigChecksumFileName        = "gateway.checksum"
+	GatewayDynamicConfigFileName = "gateway.dynamic.yaml"
+	GatewayCDSConfigFileName     = "gateway.dynamic.cds.yaml"
+	GatewayLDSConfigFileName     = "gateway.dynamic.lds.yaml"
 	GatewayConfigChecksumENV     = "GATEWAY_CONFIG_CHECKSUM"
-	GatewayConfigFilePath                = GatewayVolumeMountDir + GatewayConfigFileName
 )
 
 func GetGatewayConfigMapName(name string) string {
@@ -47,7 +48,17 @@ func createGatewayVolumes(input pod.Input) pod.Volumes {
 	volumes := pod.NewVolumes()
 
 	volumes.AddVolume(k8sutil.CreateVolumeWithConfigMap(GatewayVolumeName, GetGatewayConfigMapName(input.ApiObject.GetName())))
-	volumes.AddVolumeMount(GatewayVolumeMount())
+	volumes.AddVolume(k8sutil.CreateVolumeWithConfigMap(MemberConfigVolumeName, input.ArangoMember.GetName()))
+	volumes.AddVolumeMount(core.VolumeMount{
+		Name:      GatewayVolumeName,
+		MountPath: GatewayVolumeMountDir,
+		ReadOnly:  true,
+	})
+	volumes.AddVolumeMount(core.VolumeMount{
+		Name:      MemberConfigVolumeName,
+		MountPath: MemberConfigVolumeMountDir,
+		ReadOnly:  true,
+	})
 
 	// TLS
 	volumes.Append(pod.TLS(), input)
@@ -57,11 +68,3 @@ func createGatewayVolumes(input pod.Input) pod.Volumes {
 
 	return volumes
 }
-
-func GatewayVolumeMount() core.VolumeMount {
-	return core.VolumeMount{
-		Name:      GatewayVolumeName,
-		MountPath: GatewayVolumeMountDir,
-		ReadOnly:  true,
-	}
-}

pkg/deployment/resources/pod_creator_gateway_container.go

@@ -131,18 +131,26 @@ func (a *ArangoGatewayContainer) GetEnvs() ([]core.EnvVar, []core.EnvFromSource)
 
 	envs.Add(true, k8sutil.GetLifecycleEnv()...)
 
-	var cmChecksum = ""
+	if cm, ok := a.cachedStatus.ConfigMap().V1().GetSimple(GetGatewayConfigMapName(a.input.ArangoMember.GetName())); ok {
+		if v, ok := cm.Data[ConfigMapChecksumKey]; ok {
+			envs.Add(true, core.EnvVar{
+				Name:  MemberConfigChecksumENV,
+				Value: v,
+			})
+		}
+	}
 
+	if !a.spec.Gateway.IsDynamic() {
 		if cm, ok := a.cachedStatus.ConfigMap().V1().GetSimple(GetGatewayConfigMapName(a.input.ApiObject.GetName())); ok {
-		if v, ok := cm.Data[GatewayConfigChecksumFileName]; ok {
-			cmChecksum = v
-		}
-	}
-
+			if v, ok := cm.Data[ConfigMapChecksumKey]; ok {
 				envs.Add(true, core.EnvVar{
 					Name:  GatewayConfigChecksumENV,
-		Value: cmChecksum,
+					Value: v,
 				})
+			}
+		}
+
+	}
 
 	if len(a.groupSpec.Envs) > 0 {
 		for _, env := range a.groupSpec.Envs {

pkg/generated/timezones/timezones_test.go

@@ -1,7 +1,7 @@
 //
 // DISCLAIMER
 //
-// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
+// Copyright 2016-2024 ArangoDB GmbH, Cologne, Germany
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -28,6 +28,10 @@ import (
 )
 
 func Test_Timezone(t *testing.T) {
+	// Ensure we use static time for comparison
+	testTime, err := time.Parse(time.RFC3339, "2024-09-01T00:00:00Z")
+	require.NoError(t, err)
+
 	for tz, tq := range timezones {
 		t.Run(tz, func(t *testing.T) {
 			t.Run("Check fields", func(t *testing.T) {
@@ -49,7 +53,7 @@ func Test_Timezone(t *testing.T) {
 				l, err := time.LoadLocationFromTZData("", tz)
 				require.NoError(t, err)
 
-				z, offset := time.Now().In(l).Zone()
+				z, offset := testTime.In(l).Zone()
 				require.Equal(t, tq.Zone, z)
 
 				require.Equal(t, int(tq.Offset/time.Second), offset)

pkg/util/checksum.go

@@ -50,6 +50,14 @@ func SHA256FromStringArray(data ...string) string {
 	return SHA256FromString(strings.Join(data, "|"))
 }
 
+func SHA256FromStringMap(data map[string]string) string {
+	return SHA256FromExtract(func(t KV[string, string]) string {
+		return fmt.Sprintf("%s:%s", t.K, SHA256FromString(t.V))
+	}, ExtractWithSort(data, func(i, j string) bool {
+		return i < j
+	})...)
+}
+
 func SHA256FromString(data string) string {
 	return SHA256([]byte(data))
 }

pkg/util/dict.go

@@ -43,6 +43,12 @@ func Extract[K comparable, V any](in map[K]V) []KV[K, V] {
 	return r
 }
 
+func ExtractWithSort[K comparable, V any](in map[K]V, cmp func(i, j K) bool) []KV[K, V] {
+	return Sort(Extract(in), func(i, j KV[K, V]) bool {
+		return cmp(i.K, j.K)
+	})
+}
+
 func Sort[IN any](in []IN, cmp func(i, j IN) bool) []IN {
 	r := make([]IN, len(in))
 	copy(r, in)