diff --git a/profiles/preview/preview/containerservice/mgmt/containerservice/models.go b/profiles/preview/preview/containerservice/mgmt/containerservice/models.go
index debe076b5cee..86486ede0e38 100644
--- a/profiles/preview/preview/containerservice/mgmt/containerservice/models.go
+++ b/profiles/preview/preview/containerservice/mgmt/containerservice/models.go
@@ -66,8 +66,39 @@ const (
 type OpenShiftContainerServiceVMSize = original.OpenShiftContainerServiceVMSize
 
 const (
-	StandardD2sV3 OpenShiftContainerServiceVMSize = original.StandardD2sV3
-	StandardD4sV3 OpenShiftContainerServiceVMSize = original.StandardD4sV3
+	StandardD16sV3 OpenShiftContainerServiceVMSize = original.StandardD16sV3
+	StandardD2sV3  OpenShiftContainerServiceVMSize = original.StandardD2sV3
+	StandardD32sV3 OpenShiftContainerServiceVMSize = original.StandardD32sV3
+	StandardD4sV3  OpenShiftContainerServiceVMSize = original.StandardD4sV3
+	StandardD64sV3 OpenShiftContainerServiceVMSize = original.StandardD64sV3
+	StandardD8sV3  OpenShiftContainerServiceVMSize = original.StandardD8sV3
+	StandardDS12V2 OpenShiftContainerServiceVMSize = original.StandardDS12V2
+	StandardDS13V2 OpenShiftContainerServiceVMSize = original.StandardDS13V2
+	StandardDS14V2 OpenShiftContainerServiceVMSize = original.StandardDS14V2
+	StandardDS15V2 OpenShiftContainerServiceVMSize = original.StandardDS15V2
+	StandardDS4V2  OpenShiftContainerServiceVMSize = original.StandardDS4V2
+	StandardDS5V2  OpenShiftContainerServiceVMSize = original.StandardDS5V2
+	StandardE16sV3 OpenShiftContainerServiceVMSize = original.StandardE16sV3
+	StandardE20sV3 OpenShiftContainerServiceVMSize = original.StandardE20sV3
+	StandardE32sV3 OpenShiftContainerServiceVMSize = original.StandardE32sV3
+	StandardE4sV3  OpenShiftContainerServiceVMSize = original.StandardE4sV3
+	StandardE64sV3 OpenShiftContainerServiceVMSize = original.StandardE64sV3
+	StandardE8sV3  OpenShiftContainerServiceVMSize = original.StandardE8sV3
+	StandardF16s   OpenShiftContainerServiceVMSize = original.StandardF16s
+	StandardF16sV2 OpenShiftContainerServiceVMSize = original.StandardF16sV2
+	StandardF32sV2 OpenShiftContainerServiceVMSize = original.StandardF32sV2
+	StandardF64sV2 OpenShiftContainerServiceVMSize = original.StandardF64sV2
+	StandardF72sV2 OpenShiftContainerServiceVMSize = original.StandardF72sV2
+	StandardF8s    OpenShiftContainerServiceVMSize = original.StandardF8s
+	StandardF8sV2  OpenShiftContainerServiceVMSize = original.StandardF8sV2
+	StandardGS2    OpenShiftContainerServiceVMSize = original.StandardGS2
+	StandardGS3    OpenShiftContainerServiceVMSize = original.StandardGS3
+	StandardGS4    OpenShiftContainerServiceVMSize = original.StandardGS4
+	StandardGS5    OpenShiftContainerServiceVMSize = original.StandardGS5
+	StandardL16s   OpenShiftContainerServiceVMSize = original.StandardL16s
+	StandardL32s   OpenShiftContainerServiceVMSize = original.StandardL32s
+	StandardL4s    OpenShiftContainerServiceVMSize = original.StandardL4s
+	StandardL8s    OpenShiftContainerServiceVMSize = original.StandardL8s
 )
 
 type OrchestratorTypes = original.OrchestratorTypes
@@ -311,6 +342,9 @@ type OpenShiftManagedClusterAgentPoolProfile = original.OpenShiftManagedClusterA
 type OpenShiftManagedClusterAuthProfile = original.OpenShiftManagedClusterAuthProfile
 type OpenShiftManagedClusterBaseIdentityProvider = original.OpenShiftManagedClusterBaseIdentityProvider
 type OpenShiftManagedClusterIdentityProvider = original.OpenShiftManagedClusterIdentityProvider
+type OpenShiftManagedClusterListResult = original.OpenShiftManagedClusterListResult
+type OpenShiftManagedClusterListResultIterator = original.OpenShiftManagedClusterListResultIterator
+type OpenShiftManagedClusterListResultPage = original.OpenShiftManagedClusterListResultPage
 type OpenShiftManagedClusterMasterPoolProfile = original.OpenShiftManagedClusterMasterPoolProfile
 type OpenShiftManagedClusterProperties = original.OpenShiftManagedClusterProperties
 type OpenShiftManagedClustersClient = original.OpenShiftManagedClustersClient
@@ -364,6 +398,12 @@ func NewManagedClustersClient(subscriptionID string) ManagedClustersClient {
 func NewManagedClustersClientWithBaseURI(baseURI string, subscriptionID string) ManagedClustersClient {
 	return original.NewManagedClustersClientWithBaseURI(baseURI, subscriptionID)
 }
+func NewOpenShiftManagedClusterListResultIterator(page OpenShiftManagedClusterListResultPage) OpenShiftManagedClusterListResultIterator {
+	return original.NewOpenShiftManagedClusterListResultIterator(page)
+}
+func NewOpenShiftManagedClusterListResultPage(getNextPage func(context.Context, OpenShiftManagedClusterListResult) (OpenShiftManagedClusterListResult, error)) OpenShiftManagedClusterListResultPage {
+	return original.NewOpenShiftManagedClusterListResultPage(getNextPage)
+}
 func NewOpenShiftManagedClustersClient(subscriptionID string) OpenShiftManagedClustersClient {
 	return original.NewOpenShiftManagedClustersClient(subscriptionID)
 }
diff --git a/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/containerserviceapi/interfaces.go b/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/containerserviceapi/interfaces.go
index 2999df5625fb..5193ed31fafc 100644
--- a/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/containerserviceapi/interfaces.go
+++ b/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/containerserviceapi/interfaces.go
@@ -27,6 +27,8 @@ type OpenShiftManagedClustersClientAPI interface {
 	CreateOrUpdate(ctx context.Context, resourceGroupName string, resourceName string, parameters containerservice.OpenShiftManagedCluster) (result containerservice.OpenShiftManagedClustersCreateOrUpdateFuture, err error)
 	Delete(ctx context.Context, resourceGroupName string, resourceName string) (result containerservice.OpenShiftManagedClustersDeleteFuture, err error)
 	Get(ctx context.Context, resourceGroupName string, resourceName string) (result containerservice.OpenShiftManagedCluster, err error)
+	List(ctx context.Context) (result containerservice.OpenShiftManagedClusterListResultPage, err error)
+	ListByResourceGroup(ctx context.Context, resourceGroupName string) (result containerservice.OpenShiftManagedClusterListResultPage, err error)
 	UpdateTags(ctx context.Context, resourceGroupName string, resourceName string, parameters containerservice.TagsObject) (result containerservice.OpenShiftManagedClustersUpdateTagsFuture, err error)
 }
 
diff --git a/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/models.go b/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/models.go
index 482dfa1b1cd4..f63940436b60 100644
--- a/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/models.go
+++ b/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/models.go
@@ -107,15 +107,77 @@ func PossibleOpenShiftAgentPoolProfileRoleValues() []OpenShiftAgentPoolProfileRo
 type OpenShiftContainerServiceVMSize string
 
 const (
+	// StandardD16sV3 ...
+	StandardD16sV3 OpenShiftContainerServiceVMSize = "Standard_D16s_v3"
 	// StandardD2sV3 ...
 	StandardD2sV3 OpenShiftContainerServiceVMSize = "Standard_D2s_v3"
+	// StandardD32sV3 ...
+	StandardD32sV3 OpenShiftContainerServiceVMSize = "Standard_D32s_v3"
 	// StandardD4sV3 ...
 	StandardD4sV3 OpenShiftContainerServiceVMSize = "Standard_D4s_v3"
+	// StandardD64sV3 ...
+	StandardD64sV3 OpenShiftContainerServiceVMSize = "Standard_D64s_v3"
+	// StandardD8sV3 ...
+	StandardD8sV3 OpenShiftContainerServiceVMSize = "Standard_D8s_v3"
+	// StandardDS12V2 ...
+	StandardDS12V2 OpenShiftContainerServiceVMSize = "Standard_DS12_v2"
+	// StandardDS13V2 ...
+	StandardDS13V2 OpenShiftContainerServiceVMSize = "Standard_DS13_v2"
+	// StandardDS14V2 ...
+	StandardDS14V2 OpenShiftContainerServiceVMSize = "Standard_DS14_v2"
+	// StandardDS15V2 ...
+	StandardDS15V2 OpenShiftContainerServiceVMSize = "Standard_DS15_v2"
+	// StandardDS4V2 ...
+	StandardDS4V2 OpenShiftContainerServiceVMSize = "Standard_DS4_v2"
+	// StandardDS5V2 ...
+	StandardDS5V2 OpenShiftContainerServiceVMSize = "Standard_DS5_v2"
+	// StandardE16sV3 ...
+	StandardE16sV3 OpenShiftContainerServiceVMSize = "Standard_E16s_v3"
+	// StandardE20sV3 ...
+	StandardE20sV3 OpenShiftContainerServiceVMSize = "Standard_E20s_v3"
+	// StandardE32sV3 ...
+	StandardE32sV3 OpenShiftContainerServiceVMSize = "Standard_E32s_v3"
+	// StandardE4sV3 ...
+	StandardE4sV3 OpenShiftContainerServiceVMSize = "Standard_E4s_v3"
+	// StandardE64sV3 ...
+	StandardE64sV3 OpenShiftContainerServiceVMSize = "Standard_E64s_v3"
+	// StandardE8sV3 ...
+	StandardE8sV3 OpenShiftContainerServiceVMSize = "Standard_E8s_v3"
+	// StandardF16s ...
+	StandardF16s OpenShiftContainerServiceVMSize = "Standard_F16s"
+	// StandardF16sV2 ...
+	StandardF16sV2 OpenShiftContainerServiceVMSize = "Standard_F16s_v2"
+	// StandardF32sV2 ...
+	StandardF32sV2 OpenShiftContainerServiceVMSize = "Standard_F32s_v2"
+	// StandardF64sV2 ...
+	StandardF64sV2 OpenShiftContainerServiceVMSize = "Standard_F64s_v2"
+	// StandardF72sV2 ...
+	StandardF72sV2 OpenShiftContainerServiceVMSize = "Standard_F72s_v2"
+	// StandardF8s ...
+	StandardF8s OpenShiftContainerServiceVMSize = "Standard_F8s"
+	// StandardF8sV2 ...
+	StandardF8sV2 OpenShiftContainerServiceVMSize = "Standard_F8s_v2"
+	// StandardGS2 ...
+	StandardGS2 OpenShiftContainerServiceVMSize = "Standard_GS2"
+	// StandardGS3 ...
+	StandardGS3 OpenShiftContainerServiceVMSize = "Standard_GS3"
+	// StandardGS4 ...
+	StandardGS4 OpenShiftContainerServiceVMSize = "Standard_GS4"
+	// StandardGS5 ...
+	StandardGS5 OpenShiftContainerServiceVMSize = "Standard_GS5"
+	// StandardL16s ...
+	StandardL16s OpenShiftContainerServiceVMSize = "Standard_L16s"
+	// StandardL32s ...
+	StandardL32s OpenShiftContainerServiceVMSize = "Standard_L32s"
+	// StandardL4s ...
+	StandardL4s OpenShiftContainerServiceVMSize = "Standard_L4s"
+	// StandardL8s ...
+	StandardL8s OpenShiftContainerServiceVMSize = "Standard_L8s"
 )
 
 // PossibleOpenShiftContainerServiceVMSizeValues returns an array of possible values for the OpenShiftContainerServiceVMSize const type.
 func PossibleOpenShiftContainerServiceVMSizeValues() []OpenShiftContainerServiceVMSize {
-	return []OpenShiftContainerServiceVMSize{StandardD2sV3, StandardD4sV3}
+	return []OpenShiftContainerServiceVMSize{StandardD16sV3, StandardD2sV3, StandardD32sV3, StandardD4sV3, StandardD64sV3, StandardD8sV3, StandardDS12V2, StandardDS13V2, StandardDS14V2, StandardDS15V2, StandardDS4V2, StandardDS5V2, StandardE16sV3, StandardE20sV3, StandardE32sV3, StandardE4sV3, StandardE64sV3, StandardE8sV3, StandardF16s, StandardF16sV2, StandardF32sV2, StandardF64sV2, StandardF72sV2, StandardF8s, StandardF8sV2, StandardGS2, StandardGS3, StandardGS4, StandardGS5, StandardL16s, StandardL32s, StandardL4s, StandardL8s}
 }
 
 // OrchestratorTypes enumerates the values for orchestrator types.
@@ -560,6 +622,7 @@ type AgentPoolProfile struct {
 
 // CloudError an error response from the Container service.
 type CloudError struct {
+	// Error - Details about the error.
 	Error *CloudErrorBody `json:"error,omitempty"`
 }
 
@@ -1831,9 +1894,9 @@ func (osmcaip OpenShiftManagedClusterAADIdentityProvider) AsBasicOpenShiftManage
 type OpenShiftManagedClusterAgentPoolProfile struct {
 	// Name - Unique name of the pool profile in the context of the subscription and resource group.
 	Name *string `json:"name,omitempty"`
-	// Count - Number of agents (VMs) to host docker containers. Allowed values must be in the range of 1 to 5 (inclusive). The default value is 2.
+	// Count - Number of agents (VMs) to host docker containers.
 	Count *int32 `json:"count,omitempty"`
-	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3'
+	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3', 'StandardD8sV3', 'StandardD16sV3', 'StandardD32sV3', 'StandardD64sV3', 'StandardDS4V2', 'StandardDS5V2', 'StandardF8sV2', 'StandardF16sV2', 'StandardF32sV2', 'StandardF64sV2', 'StandardF72sV2', 'StandardF8s', 'StandardF16s', 'StandardE4sV3', 'StandardE8sV3', 'StandardE16sV3', 'StandardE20sV3', 'StandardE32sV3', 'StandardE64sV3', 'StandardGS2', 'StandardGS3', 'StandardGS4', 'StandardGS5', 'StandardDS12V2', 'StandardDS13V2', 'StandardDS14V2', 'StandardDS15V2', 'StandardL4s', 'StandardL8s', 'StandardL16s', 'StandardL32s'
 	VMSize OpenShiftContainerServiceVMSize `json:"vmSize,omitempty"`
 	// SubnetCidr - Subnet CIDR for the peering.
 	SubnetCidr *string `json:"subnetCidr,omitempty"`
@@ -1965,6 +2028,153 @@ func (osmcip *OpenShiftManagedClusterIdentityProvider) UnmarshalJSON(body []byte
 	return nil
 }
 
+// OpenShiftManagedClusterListResult the response from the List OpenShift Managed Clusters operation.
+type OpenShiftManagedClusterListResult struct {
+	autorest.Response `json:"-"`
+	// Value - The list of OpenShift managed clusters.
+	Value *[]OpenShiftManagedCluster `json:"value,omitempty"`
+	// NextLink - The URL to get the next set of OpenShift managed cluster results.
+	NextLink *string `json:"nextLink,omitempty"`
+}
+
+// OpenShiftManagedClusterListResultIterator provides access to a complete listing of
+// OpenShiftManagedCluster values.
+type OpenShiftManagedClusterListResultIterator struct {
+	i    int
+	page OpenShiftManagedClusterListResultPage
+}
+
+// NextWithContext advances to the next value.  If there was an error making
+// the request the iterator does not advance and the error is returned.
+func (iter *OpenShiftManagedClusterListResultIterator) NextWithContext(ctx context.Context) (err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClusterListResultIterator.NextWithContext")
+		defer func() {
+			sc := -1
+			if iter.Response().Response.Response != nil {
+				sc = iter.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	iter.i++
+	if iter.i < len(iter.page.Values()) {
+		return nil
+	}
+	err = iter.page.NextWithContext(ctx)
+	if err != nil {
+		iter.i--
+		return err
+	}
+	iter.i = 0
+	return nil
+}
+
+// Next advances to the next value.  If there was an error making
+// the request the iterator does not advance and the error is returned.
+// Deprecated: Use NextWithContext() instead.
+func (iter *OpenShiftManagedClusterListResultIterator) Next() error {
+	return iter.NextWithContext(context.Background())
+}
+
+// NotDone returns true if the enumeration should be started or is not yet complete.
+func (iter OpenShiftManagedClusterListResultIterator) NotDone() bool {
+	return iter.page.NotDone() && iter.i < len(iter.page.Values())
+}
+
+// Response returns the raw server response from the last page request.
+func (iter OpenShiftManagedClusterListResultIterator) Response() OpenShiftManagedClusterListResult {
+	return iter.page.Response()
+}
+
+// Value returns the current value or a zero-initialized value if the
+// iterator has advanced beyond the end of the collection.
+func (iter OpenShiftManagedClusterListResultIterator) Value() OpenShiftManagedCluster {
+	if !iter.page.NotDone() {
+		return OpenShiftManagedCluster{}
+	}
+	return iter.page.Values()[iter.i]
+}
+
+// Creates a new instance of the OpenShiftManagedClusterListResultIterator type.
+func NewOpenShiftManagedClusterListResultIterator(page OpenShiftManagedClusterListResultPage) OpenShiftManagedClusterListResultIterator {
+	return OpenShiftManagedClusterListResultIterator{page: page}
+}
+
+// IsEmpty returns true if the ListResult contains no values.
+func (osmclr OpenShiftManagedClusterListResult) IsEmpty() bool {
+	return osmclr.Value == nil || len(*osmclr.Value) == 0
+}
+
+// openShiftManagedClusterListResultPreparer prepares a request to retrieve the next set of results.
+// It returns nil if no more results exist.
+func (osmclr OpenShiftManagedClusterListResult) openShiftManagedClusterListResultPreparer(ctx context.Context) (*http.Request, error) {
+	if osmclr.NextLink == nil || len(to.String(osmclr.NextLink)) < 1 {
+		return nil, nil
+	}
+	return autorest.Prepare((&http.Request{}).WithContext(ctx),
+		autorest.AsJSON(),
+		autorest.AsGet(),
+		autorest.WithBaseURL(to.String(osmclr.NextLink)))
+}
+
+// OpenShiftManagedClusterListResultPage contains a page of OpenShiftManagedCluster values.
+type OpenShiftManagedClusterListResultPage struct {
+	fn     func(context.Context, OpenShiftManagedClusterListResult) (OpenShiftManagedClusterListResult, error)
+	osmclr OpenShiftManagedClusterListResult
+}
+
+// NextWithContext advances to the next page of values.  If there was an error making
+// the request the page does not advance and the error is returned.
+func (page *OpenShiftManagedClusterListResultPage) NextWithContext(ctx context.Context) (err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClusterListResultPage.NextWithContext")
+		defer func() {
+			sc := -1
+			if page.Response().Response.Response != nil {
+				sc = page.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	next, err := page.fn(ctx, page.osmclr)
+	if err != nil {
+		return err
+	}
+	page.osmclr = next
+	return nil
+}
+
+// Next advances to the next page of values.  If there was an error making
+// the request the page does not advance and the error is returned.
+// Deprecated: Use NextWithContext() instead.
+func (page *OpenShiftManagedClusterListResultPage) Next() error {
+	return page.NextWithContext(context.Background())
+}
+
+// NotDone returns true if the page enumeration should be started or is not yet complete.
+func (page OpenShiftManagedClusterListResultPage) NotDone() bool {
+	return !page.osmclr.IsEmpty()
+}
+
+// Response returns the raw server response from the last page request.
+func (page OpenShiftManagedClusterListResultPage) Response() OpenShiftManagedClusterListResult {
+	return page.osmclr
+}
+
+// Values returns the slice of values for the current page or nil if there are no values.
+func (page OpenShiftManagedClusterListResultPage) Values() []OpenShiftManagedCluster {
+	if page.osmclr.IsEmpty() {
+		return nil
+	}
+	return *page.osmclr.Value
+}
+
+// Creates a new instance of the OpenShiftManagedClusterListResultPage type.
+func NewOpenShiftManagedClusterListResultPage(getNextPage func(context.Context, OpenShiftManagedClusterListResult) (OpenShiftManagedClusterListResult, error)) OpenShiftManagedClusterListResultPage {
+	return OpenShiftManagedClusterListResultPage{fn: getNextPage}
+}
+
 // OpenShiftManagedClusterMasterPoolProfile openShiftManagedClusterMaterPoolProfile contains configuration
 // for OpenShift master VMs.
 type OpenShiftManagedClusterMasterPoolProfile struct {
@@ -1972,7 +2182,7 @@ type OpenShiftManagedClusterMasterPoolProfile struct {
 	Name *string `json:"name,omitempty"`
 	// Count - Number of masters (VMs) to host docker containers. The default value is 3.
 	Count *int32 `json:"count,omitempty"`
-	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3'
+	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3', 'StandardD8sV3', 'StandardD16sV3', 'StandardD32sV3', 'StandardD64sV3', 'StandardDS4V2', 'StandardDS5V2', 'StandardF8sV2', 'StandardF16sV2', 'StandardF32sV2', 'StandardF64sV2', 'StandardF72sV2', 'StandardF8s', 'StandardF16s', 'StandardE4sV3', 'StandardE8sV3', 'StandardE16sV3', 'StandardE20sV3', 'StandardE32sV3', 'StandardE64sV3', 'StandardGS2', 'StandardGS3', 'StandardGS4', 'StandardGS5', 'StandardDS12V2', 'StandardDS13V2', 'StandardDS14V2', 'StandardDS15V2', 'StandardL4s', 'StandardL8s', 'StandardL16s', 'StandardL32s'
 	VMSize OpenShiftContainerServiceVMSize `json:"vmSize,omitempty"`
 	// SubnetCidr - Subnet CIDR for the peering.
 	SubnetCidr *string `json:"subnetCidr,omitempty"`
diff --git a/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/openshiftmanagedclusters.go b/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/openshiftmanagedclusters.go
index eb827294b6fd..e3de6e2f08c1 100644
--- a/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/openshiftmanagedclusters.go
+++ b/services/preview/containerservice/mgmt/2018-08-01-preview/containerservice/openshiftmanagedclusters.go
@@ -63,11 +63,7 @@ func (client OpenShiftManagedClustersClient) CreateOrUpdate(ctx context.Context,
 			Constraints: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties", Name: validation.Null, Rule: false,
 				Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.OpenShiftVersion", Name: validation.Null, Rule: true, Chain: nil},
 					{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile", Name: validation.Null, Rule: false,
-						Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.Null, Rule: true,
-							Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.InclusiveMaximum, Rule: int64(10), Chain: nil},
-								{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.InclusiveMinimum, Rule: 1, Chain: nil},
-							}},
-						}},
+						Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.Null, Rule: true, Chain: nil}}},
 				}}}}}); err != nil {
 		return result, validation.NewError("containerservice.OpenShiftManagedClustersClient", "CreateOrUpdate", err.Error())
 	}
@@ -289,6 +285,231 @@ func (client OpenShiftManagedClustersClient) GetResponder(resp *http.Response) (
 	return
 }
 
+// List gets a list of OpenShift managed clusters in the specified subscription. The operation returns properties of
+// each OpenShift managed cluster.
+func (client OpenShiftManagedClustersClient) List(ctx context.Context) (result OpenShiftManagedClusterListResultPage, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.List")
+		defer func() {
+			sc := -1
+			if result.osmclr.Response.Response != nil {
+				sc = result.osmclr.Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.fn = client.listNextResults
+	req, err := client.ListPreparer(ctx)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "List", nil, "Failure preparing request")
+		return
+	}
+
+	resp, err := client.ListSender(req)
+	if err != nil {
+		result.osmclr.Response = autorest.Response{Response: resp}
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "List", resp, "Failure sending request")
+		return
+	}
+
+	result.osmclr, err = client.ListResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "List", resp, "Failure responding to request")
+	}
+
+	return
+}
+
+// ListPreparer prepares the List request.
+func (client OpenShiftManagedClustersClient) ListPreparer(ctx context.Context) (*http.Request, error) {
+	pathParameters := map[string]interface{}{
+		"subscriptionId": autorest.Encode("path", client.SubscriptionID),
+	}
+
+	const APIVersion = "2018-09-30-preview"
+	queryParameters := map[string]interface{}{
+		"api-version": APIVersion,
+	}
+
+	preparer := autorest.CreatePreparer(
+		autorest.AsGet(),
+		autorest.WithBaseURL(client.BaseURI),
+		autorest.WithPathParameters("/subscriptions/{subscriptionId}/providers/Microsoft.ContainerService/openShiftManagedClusters", pathParameters),
+		autorest.WithQueryParameters(queryParameters))
+	return preparer.Prepare((&http.Request{}).WithContext(ctx))
+}
+
+// ListSender sends the List request. The method will close the
+// http.Response Body if it receives an error.
+func (client OpenShiftManagedClustersClient) ListSender(req *http.Request) (*http.Response, error) {
+	return autorest.SendWithSender(client, req,
+		azure.DoRetryWithRegistration(client.Client))
+}
+
+// ListResponder handles the response to the List request. The method always
+// closes the http.Response Body.
+func (client OpenShiftManagedClustersClient) ListResponder(resp *http.Response) (result OpenShiftManagedClusterListResult, err error) {
+	err = autorest.Respond(
+		resp,
+		client.ByInspecting(),
+		azure.WithErrorUnlessStatusCode(http.StatusOK),
+		autorest.ByUnmarshallingJSON(&result),
+		autorest.ByClosing())
+	result.Response = autorest.Response{Response: resp}
+	return
+}
+
+// listNextResults retrieves the next set of results, if any.
+func (client OpenShiftManagedClustersClient) listNextResults(ctx context.Context, lastResults OpenShiftManagedClusterListResult) (result OpenShiftManagedClusterListResult, err error) {
+	req, err := lastResults.openShiftManagedClusterListResultPreparer(ctx)
+	if err != nil {
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listNextResults", nil, "Failure preparing next results request")
+	}
+	if req == nil {
+		return
+	}
+	resp, err := client.ListSender(req)
+	if err != nil {
+		result.Response = autorest.Response{Response: resp}
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listNextResults", resp, "Failure sending next results request")
+	}
+	result, err = client.ListResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listNextResults", resp, "Failure responding to next results request")
+	}
+	return
+}
+
+// ListComplete enumerates all values, automatically crossing page boundaries as required.
+func (client OpenShiftManagedClustersClient) ListComplete(ctx context.Context) (result OpenShiftManagedClusterListResultIterator, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.List")
+		defer func() {
+			sc := -1
+			if result.Response().Response.Response != nil {
+				sc = result.page.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.page, err = client.List(ctx)
+	return
+}
+
+// ListByResourceGroup lists OpenShift managed clusters in the specified subscription and resource group. The operation
+// returns properties of each OpenShift managed cluster.
+// Parameters:
+// resourceGroupName - the name of the resource group.
+func (client OpenShiftManagedClustersClient) ListByResourceGroup(ctx context.Context, resourceGroupName string) (result OpenShiftManagedClusterListResultPage, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.ListByResourceGroup")
+		defer func() {
+			sc := -1
+			if result.osmclr.Response.Response != nil {
+				sc = result.osmclr.Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.fn = client.listByResourceGroupNextResults
+	req, err := client.ListByResourceGroupPreparer(ctx, resourceGroupName)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "ListByResourceGroup", nil, "Failure preparing request")
+		return
+	}
+
+	resp, err := client.ListByResourceGroupSender(req)
+	if err != nil {
+		result.osmclr.Response = autorest.Response{Response: resp}
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "ListByResourceGroup", resp, "Failure sending request")
+		return
+	}
+
+	result.osmclr, err = client.ListByResourceGroupResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "ListByResourceGroup", resp, "Failure responding to request")
+	}
+
+	return
+}
+
+// ListByResourceGroupPreparer prepares the ListByResourceGroup request.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupPreparer(ctx context.Context, resourceGroupName string) (*http.Request, error) {
+	pathParameters := map[string]interface{}{
+		"resourceGroupName": autorest.Encode("path", resourceGroupName),
+		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
+	}
+
+	const APIVersion = "2018-09-30-preview"
+	queryParameters := map[string]interface{}{
+		"api-version": APIVersion,
+	}
+
+	preparer := autorest.CreatePreparer(
+		autorest.AsGet(),
+		autorest.WithBaseURL(client.BaseURI),
+		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ContainerService/openShiftManagedClusters", pathParameters),
+		autorest.WithQueryParameters(queryParameters))
+	return preparer.Prepare((&http.Request{}).WithContext(ctx))
+}
+
+// ListByResourceGroupSender sends the ListByResourceGroup request. The method will close the
+// http.Response Body if it receives an error.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupSender(req *http.Request) (*http.Response, error) {
+	return autorest.SendWithSender(client, req,
+		azure.DoRetryWithRegistration(client.Client))
+}
+
+// ListByResourceGroupResponder handles the response to the ListByResourceGroup request. The method always
+// closes the http.Response Body.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupResponder(resp *http.Response) (result OpenShiftManagedClusterListResult, err error) {
+	err = autorest.Respond(
+		resp,
+		client.ByInspecting(),
+		azure.WithErrorUnlessStatusCode(http.StatusOK),
+		autorest.ByUnmarshallingJSON(&result),
+		autorest.ByClosing())
+	result.Response = autorest.Response{Response: resp}
+	return
+}
+
+// listByResourceGroupNextResults retrieves the next set of results, if any.
+func (client OpenShiftManagedClustersClient) listByResourceGroupNextResults(ctx context.Context, lastResults OpenShiftManagedClusterListResult) (result OpenShiftManagedClusterListResult, err error) {
+	req, err := lastResults.openShiftManagedClusterListResultPreparer(ctx)
+	if err != nil {
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listByResourceGroupNextResults", nil, "Failure preparing next results request")
+	}
+	if req == nil {
+		return
+	}
+	resp, err := client.ListByResourceGroupSender(req)
+	if err != nil {
+		result.Response = autorest.Response{Response: resp}
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listByResourceGroupNextResults", resp, "Failure sending next results request")
+	}
+	result, err = client.ListByResourceGroupResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listByResourceGroupNextResults", resp, "Failure responding to next results request")
+	}
+	return
+}
+
+// ListByResourceGroupComplete enumerates all values, automatically crossing page boundaries as required.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupComplete(ctx context.Context, resourceGroupName string) (result OpenShiftManagedClusterListResultIterator, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.ListByResourceGroup")
+		defer func() {
+			sc := -1
+			if result.Response().Response.Response != nil {
+				sc = result.page.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.page, err = client.ListByResourceGroup(ctx, resourceGroupName)
+	return
+}
+
 // UpdateTags updates an openshift managed cluster with the specified tags.
 // Parameters:
 // resourceGroupName - the name of the resource group.
diff --git a/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/containerserviceapi/interfaces.go b/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/containerserviceapi/interfaces.go
index 3c79fca5e7e7..5481a5117356 100644
--- a/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/containerserviceapi/interfaces.go
+++ b/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/containerserviceapi/interfaces.go
@@ -27,6 +27,8 @@ type OpenShiftManagedClustersClientAPI interface {
 	CreateOrUpdate(ctx context.Context, resourceGroupName string, resourceName string, parameters containerservice.OpenShiftManagedCluster) (result containerservice.OpenShiftManagedClustersCreateOrUpdateFuture, err error)
 	Delete(ctx context.Context, resourceGroupName string, resourceName string) (result containerservice.OpenShiftManagedClustersDeleteFuture, err error)
 	Get(ctx context.Context, resourceGroupName string, resourceName string) (result containerservice.OpenShiftManagedCluster, err error)
+	List(ctx context.Context) (result containerservice.OpenShiftManagedClusterListResultPage, err error)
+	ListByResourceGroup(ctx context.Context, resourceGroupName string) (result containerservice.OpenShiftManagedClusterListResultPage, err error)
 	UpdateTags(ctx context.Context, resourceGroupName string, resourceName string, parameters containerservice.TagsObject) (result containerservice.OpenShiftManagedClustersUpdateTagsFuture, err error)
 }
 
diff --git a/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/models.go b/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/models.go
index b9c917e0ed37..041a676eb814 100644
--- a/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/models.go
+++ b/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/models.go
@@ -92,15 +92,77 @@ func PossibleOpenShiftAgentPoolProfileRoleValues() []OpenShiftAgentPoolProfileRo
 type OpenShiftContainerServiceVMSize string
 
 const (
+	// StandardD16sV3 ...
+	StandardD16sV3 OpenShiftContainerServiceVMSize = "Standard_D16s_v3"
 	// StandardD2sV3 ...
 	StandardD2sV3 OpenShiftContainerServiceVMSize = "Standard_D2s_v3"
+	// StandardD32sV3 ...
+	StandardD32sV3 OpenShiftContainerServiceVMSize = "Standard_D32s_v3"
 	// StandardD4sV3 ...
 	StandardD4sV3 OpenShiftContainerServiceVMSize = "Standard_D4s_v3"
+	// StandardD64sV3 ...
+	StandardD64sV3 OpenShiftContainerServiceVMSize = "Standard_D64s_v3"
+	// StandardD8sV3 ...
+	StandardD8sV3 OpenShiftContainerServiceVMSize = "Standard_D8s_v3"
+	// StandardDS12V2 ...
+	StandardDS12V2 OpenShiftContainerServiceVMSize = "Standard_DS12_v2"
+	// StandardDS13V2 ...
+	StandardDS13V2 OpenShiftContainerServiceVMSize = "Standard_DS13_v2"
+	// StandardDS14V2 ...
+	StandardDS14V2 OpenShiftContainerServiceVMSize = "Standard_DS14_v2"
+	// StandardDS15V2 ...
+	StandardDS15V2 OpenShiftContainerServiceVMSize = "Standard_DS15_v2"
+	// StandardDS4V2 ...
+	StandardDS4V2 OpenShiftContainerServiceVMSize = "Standard_DS4_v2"
+	// StandardDS5V2 ...
+	StandardDS5V2 OpenShiftContainerServiceVMSize = "Standard_DS5_v2"
+	// StandardE16sV3 ...
+	StandardE16sV3 OpenShiftContainerServiceVMSize = "Standard_E16s_v3"
+	// StandardE20sV3 ...
+	StandardE20sV3 OpenShiftContainerServiceVMSize = "Standard_E20s_v3"
+	// StandardE32sV3 ...
+	StandardE32sV3 OpenShiftContainerServiceVMSize = "Standard_E32s_v3"
+	// StandardE4sV3 ...
+	StandardE4sV3 OpenShiftContainerServiceVMSize = "Standard_E4s_v3"
+	// StandardE64sV3 ...
+	StandardE64sV3 OpenShiftContainerServiceVMSize = "Standard_E64s_v3"
+	// StandardE8sV3 ...
+	StandardE8sV3 OpenShiftContainerServiceVMSize = "Standard_E8s_v3"
+	// StandardF16s ...
+	StandardF16s OpenShiftContainerServiceVMSize = "Standard_F16s"
+	// StandardF16sV2 ...
+	StandardF16sV2 OpenShiftContainerServiceVMSize = "Standard_F16s_v2"
+	// StandardF32sV2 ...
+	StandardF32sV2 OpenShiftContainerServiceVMSize = "Standard_F32s_v2"
+	// StandardF64sV2 ...
+	StandardF64sV2 OpenShiftContainerServiceVMSize = "Standard_F64s_v2"
+	// StandardF72sV2 ...
+	StandardF72sV2 OpenShiftContainerServiceVMSize = "Standard_F72s_v2"
+	// StandardF8s ...
+	StandardF8s OpenShiftContainerServiceVMSize = "Standard_F8s"
+	// StandardF8sV2 ...
+	StandardF8sV2 OpenShiftContainerServiceVMSize = "Standard_F8s_v2"
+	// StandardGS2 ...
+	StandardGS2 OpenShiftContainerServiceVMSize = "Standard_GS2"
+	// StandardGS3 ...
+	StandardGS3 OpenShiftContainerServiceVMSize = "Standard_GS3"
+	// StandardGS4 ...
+	StandardGS4 OpenShiftContainerServiceVMSize = "Standard_GS4"
+	// StandardGS5 ...
+	StandardGS5 OpenShiftContainerServiceVMSize = "Standard_GS5"
+	// StandardL16s ...
+	StandardL16s OpenShiftContainerServiceVMSize = "Standard_L16s"
+	// StandardL32s ...
+	StandardL32s OpenShiftContainerServiceVMSize = "Standard_L32s"
+	// StandardL4s ...
+	StandardL4s OpenShiftContainerServiceVMSize = "Standard_L4s"
+	// StandardL8s ...
+	StandardL8s OpenShiftContainerServiceVMSize = "Standard_L8s"
 )
 
 // PossibleOpenShiftContainerServiceVMSizeValues returns an array of possible values for the OpenShiftContainerServiceVMSize const type.
 func PossibleOpenShiftContainerServiceVMSizeValues() []OpenShiftContainerServiceVMSize {
-	return []OpenShiftContainerServiceVMSize{StandardD2sV3, StandardD4sV3}
+	return []OpenShiftContainerServiceVMSize{StandardD16sV3, StandardD2sV3, StandardD32sV3, StandardD4sV3, StandardD64sV3, StandardD8sV3, StandardDS12V2, StandardDS13V2, StandardDS14V2, StandardDS15V2, StandardDS4V2, StandardDS5V2, StandardE16sV3, StandardE20sV3, StandardE32sV3, StandardE4sV3, StandardE64sV3, StandardE8sV3, StandardF16s, StandardF16sV2, StandardF32sV2, StandardF64sV2, StandardF72sV2, StandardF8s, StandardF8sV2, StandardGS2, StandardGS3, StandardGS4, StandardGS5, StandardL16s, StandardL32s, StandardL4s, StandardL8s}
 }
 
 // OrchestratorTypes enumerates the values for orchestrator types.
@@ -545,6 +607,7 @@ type AgentPoolProfile struct {
 
 // CloudError an error response from the Container service.
 type CloudError struct {
+	// Error - Details about the error.
 	Error *CloudErrorBody `json:"error,omitempty"`
 }
 
@@ -1810,9 +1873,9 @@ func (osmcaip OpenShiftManagedClusterAADIdentityProvider) AsBasicOpenShiftManage
 type OpenShiftManagedClusterAgentPoolProfile struct {
 	// Name - Unique name of the pool profile in the context of the subscription and resource group.
 	Name *string `json:"name,omitempty"`
-	// Count - Number of agents (VMs) to host docker containers. Allowed values must be in the range of 1 to 5 (inclusive). The default value is 2.
+	// Count - Number of agents (VMs) to host docker containers.
 	Count *int32 `json:"count,omitempty"`
-	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3'
+	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3', 'StandardD8sV3', 'StandardD16sV3', 'StandardD32sV3', 'StandardD64sV3', 'StandardDS4V2', 'StandardDS5V2', 'StandardF8sV2', 'StandardF16sV2', 'StandardF32sV2', 'StandardF64sV2', 'StandardF72sV2', 'StandardF8s', 'StandardF16s', 'StandardE4sV3', 'StandardE8sV3', 'StandardE16sV3', 'StandardE20sV3', 'StandardE32sV3', 'StandardE64sV3', 'StandardGS2', 'StandardGS3', 'StandardGS4', 'StandardGS5', 'StandardDS12V2', 'StandardDS13V2', 'StandardDS14V2', 'StandardDS15V2', 'StandardL4s', 'StandardL8s', 'StandardL16s', 'StandardL32s'
 	VMSize OpenShiftContainerServiceVMSize `json:"vmSize,omitempty"`
 	// SubnetCidr - Subnet CIDR for the peering.
 	SubnetCidr *string `json:"subnetCidr,omitempty"`
@@ -1944,6 +2007,153 @@ func (osmcip *OpenShiftManagedClusterIdentityProvider) UnmarshalJSON(body []byte
 	return nil
 }
 
+// OpenShiftManagedClusterListResult the response from the List OpenShift Managed Clusters operation.
+type OpenShiftManagedClusterListResult struct {
+	autorest.Response `json:"-"`
+	// Value - The list of OpenShift managed clusters.
+	Value *[]OpenShiftManagedCluster `json:"value,omitempty"`
+	// NextLink - The URL to get the next set of OpenShift managed cluster results.
+	NextLink *string `json:"nextLink,omitempty"`
+}
+
+// OpenShiftManagedClusterListResultIterator provides access to a complete listing of
+// OpenShiftManagedCluster values.
+type OpenShiftManagedClusterListResultIterator struct {
+	i    int
+	page OpenShiftManagedClusterListResultPage
+}
+
+// NextWithContext advances to the next value.  If there was an error making
+// the request the iterator does not advance and the error is returned.
+func (iter *OpenShiftManagedClusterListResultIterator) NextWithContext(ctx context.Context) (err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClusterListResultIterator.NextWithContext")
+		defer func() {
+			sc := -1
+			if iter.Response().Response.Response != nil {
+				sc = iter.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	iter.i++
+	if iter.i < len(iter.page.Values()) {
+		return nil
+	}
+	err = iter.page.NextWithContext(ctx)
+	if err != nil {
+		iter.i--
+		return err
+	}
+	iter.i = 0
+	return nil
+}
+
+// Next advances to the next value.  If there was an error making
+// the request the iterator does not advance and the error is returned.
+// Deprecated: Use NextWithContext() instead.
+func (iter *OpenShiftManagedClusterListResultIterator) Next() error {
+	return iter.NextWithContext(context.Background())
+}
+
+// NotDone returns true if the enumeration should be started or is not yet complete.
+func (iter OpenShiftManagedClusterListResultIterator) NotDone() bool {
+	return iter.page.NotDone() && iter.i < len(iter.page.Values())
+}
+
+// Response returns the raw server response from the last page request.
+func (iter OpenShiftManagedClusterListResultIterator) Response() OpenShiftManagedClusterListResult {
+	return iter.page.Response()
+}
+
+// Value returns the current value or a zero-initialized value if the
+// iterator has advanced beyond the end of the collection.
+func (iter OpenShiftManagedClusterListResultIterator) Value() OpenShiftManagedCluster {
+	if !iter.page.NotDone() {
+		return OpenShiftManagedCluster{}
+	}
+	return iter.page.Values()[iter.i]
+}
+
+// Creates a new instance of the OpenShiftManagedClusterListResultIterator type.
+func NewOpenShiftManagedClusterListResultIterator(page OpenShiftManagedClusterListResultPage) OpenShiftManagedClusterListResultIterator {
+	return OpenShiftManagedClusterListResultIterator{page: page}
+}
+
+// IsEmpty returns true if the ListResult contains no values.
+func (osmclr OpenShiftManagedClusterListResult) IsEmpty() bool {
+	return osmclr.Value == nil || len(*osmclr.Value) == 0
+}
+
+// openShiftManagedClusterListResultPreparer prepares a request to retrieve the next set of results.
+// It returns nil if no more results exist.
+func (osmclr OpenShiftManagedClusterListResult) openShiftManagedClusterListResultPreparer(ctx context.Context) (*http.Request, error) {
+	if osmclr.NextLink == nil || len(to.String(osmclr.NextLink)) < 1 {
+		return nil, nil
+	}
+	return autorest.Prepare((&http.Request{}).WithContext(ctx),
+		autorest.AsJSON(),
+		autorest.AsGet(),
+		autorest.WithBaseURL(to.String(osmclr.NextLink)))
+}
+
+// OpenShiftManagedClusterListResultPage contains a page of OpenShiftManagedCluster values.
+type OpenShiftManagedClusterListResultPage struct {
+	fn     func(context.Context, OpenShiftManagedClusterListResult) (OpenShiftManagedClusterListResult, error)
+	osmclr OpenShiftManagedClusterListResult
+}
+
+// NextWithContext advances to the next page of values.  If there was an error making
+// the request the page does not advance and the error is returned.
+func (page *OpenShiftManagedClusterListResultPage) NextWithContext(ctx context.Context) (err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClusterListResultPage.NextWithContext")
+		defer func() {
+			sc := -1
+			if page.Response().Response.Response != nil {
+				sc = page.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	next, err := page.fn(ctx, page.osmclr)
+	if err != nil {
+		return err
+	}
+	page.osmclr = next
+	return nil
+}
+
+// Next advances to the next page of values.  If there was an error making
+// the request the page does not advance and the error is returned.
+// Deprecated: Use NextWithContext() instead.
+func (page *OpenShiftManagedClusterListResultPage) Next() error {
+	return page.NextWithContext(context.Background())
+}
+
+// NotDone returns true if the page enumeration should be started or is not yet complete.
+func (page OpenShiftManagedClusterListResultPage) NotDone() bool {
+	return !page.osmclr.IsEmpty()
+}
+
+// Response returns the raw server response from the last page request.
+func (page OpenShiftManagedClusterListResultPage) Response() OpenShiftManagedClusterListResult {
+	return page.osmclr
+}
+
+// Values returns the slice of values for the current page or nil if there are no values.
+func (page OpenShiftManagedClusterListResultPage) Values() []OpenShiftManagedCluster {
+	if page.osmclr.IsEmpty() {
+		return nil
+	}
+	return *page.osmclr.Value
+}
+
+// Creates a new instance of the OpenShiftManagedClusterListResultPage type.
+func NewOpenShiftManagedClusterListResultPage(getNextPage func(context.Context, OpenShiftManagedClusterListResult) (OpenShiftManagedClusterListResult, error)) OpenShiftManagedClusterListResultPage {
+	return OpenShiftManagedClusterListResultPage{fn: getNextPage}
+}
+
 // OpenShiftManagedClusterMasterPoolProfile openShiftManagedClusterMaterPoolProfile contains configuration
 // for OpenShift master VMs.
 type OpenShiftManagedClusterMasterPoolProfile struct {
@@ -1951,7 +2161,7 @@ type OpenShiftManagedClusterMasterPoolProfile struct {
 	Name *string `json:"name,omitempty"`
 	// Count - Number of masters (VMs) to host docker containers. The default value is 3.
 	Count *int32 `json:"count,omitempty"`
-	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3'
+	// VMSize - Size of agent VMs. Possible values include: 'StandardD2sV3', 'StandardD4sV3', 'StandardD8sV3', 'StandardD16sV3', 'StandardD32sV3', 'StandardD64sV3', 'StandardDS4V2', 'StandardDS5V2', 'StandardF8sV2', 'StandardF16sV2', 'StandardF32sV2', 'StandardF64sV2', 'StandardF72sV2', 'StandardF8s', 'StandardF16s', 'StandardE4sV3', 'StandardE8sV3', 'StandardE16sV3', 'StandardE20sV3', 'StandardE32sV3', 'StandardE64sV3', 'StandardGS2', 'StandardGS3', 'StandardGS4', 'StandardGS5', 'StandardDS12V2', 'StandardDS13V2', 'StandardDS14V2', 'StandardDS15V2', 'StandardL4s', 'StandardL8s', 'StandardL16s', 'StandardL32s'
 	VMSize OpenShiftContainerServiceVMSize `json:"vmSize,omitempty"`
 	// SubnetCidr - Subnet CIDR for the peering.
 	SubnetCidr *string `json:"subnetCidr,omitempty"`
diff --git a/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/openshiftmanagedclusters.go b/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/openshiftmanagedclusters.go
index eb827294b6fd..e3de6e2f08c1 100644
--- a/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/openshiftmanagedclusters.go
+++ b/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice/openshiftmanagedclusters.go
@@ -63,11 +63,7 @@ func (client OpenShiftManagedClustersClient) CreateOrUpdate(ctx context.Context,
 			Constraints: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties", Name: validation.Null, Rule: false,
 				Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.OpenShiftVersion", Name: validation.Null, Rule: true, Chain: nil},
 					{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile", Name: validation.Null, Rule: false,
-						Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.Null, Rule: true,
-							Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.InclusiveMaximum, Rule: int64(10), Chain: nil},
-								{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.InclusiveMinimum, Rule: 1, Chain: nil},
-							}},
-						}},
+						Chain: []validation.Constraint{{Target: "parameters.OpenShiftManagedClusterProperties.MasterPoolProfile.Count", Name: validation.Null, Rule: true, Chain: nil}}},
 				}}}}}); err != nil {
 		return result, validation.NewError("containerservice.OpenShiftManagedClustersClient", "CreateOrUpdate", err.Error())
 	}
@@ -289,6 +285,231 @@ func (client OpenShiftManagedClustersClient) GetResponder(resp *http.Response) (
 	return
 }
 
+// List gets a list of OpenShift managed clusters in the specified subscription. The operation returns properties of
+// each OpenShift managed cluster.
+func (client OpenShiftManagedClustersClient) List(ctx context.Context) (result OpenShiftManagedClusterListResultPage, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.List")
+		defer func() {
+			sc := -1
+			if result.osmclr.Response.Response != nil {
+				sc = result.osmclr.Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.fn = client.listNextResults
+	req, err := client.ListPreparer(ctx)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "List", nil, "Failure preparing request")
+		return
+	}
+
+	resp, err := client.ListSender(req)
+	if err != nil {
+		result.osmclr.Response = autorest.Response{Response: resp}
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "List", resp, "Failure sending request")
+		return
+	}
+
+	result.osmclr, err = client.ListResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "List", resp, "Failure responding to request")
+	}
+
+	return
+}
+
+// ListPreparer prepares the List request.
+func (client OpenShiftManagedClustersClient) ListPreparer(ctx context.Context) (*http.Request, error) {
+	pathParameters := map[string]interface{}{
+		"subscriptionId": autorest.Encode("path", client.SubscriptionID),
+	}
+
+	const APIVersion = "2018-09-30-preview"
+	queryParameters := map[string]interface{}{
+		"api-version": APIVersion,
+	}
+
+	preparer := autorest.CreatePreparer(
+		autorest.AsGet(),
+		autorest.WithBaseURL(client.BaseURI),
+		autorest.WithPathParameters("/subscriptions/{subscriptionId}/providers/Microsoft.ContainerService/openShiftManagedClusters", pathParameters),
+		autorest.WithQueryParameters(queryParameters))
+	return preparer.Prepare((&http.Request{}).WithContext(ctx))
+}
+
+// ListSender sends the List request. The method will close the
+// http.Response Body if it receives an error.
+func (client OpenShiftManagedClustersClient) ListSender(req *http.Request) (*http.Response, error) {
+	return autorest.SendWithSender(client, req,
+		azure.DoRetryWithRegistration(client.Client))
+}
+
+// ListResponder handles the response to the List request. The method always
+// closes the http.Response Body.
+func (client OpenShiftManagedClustersClient) ListResponder(resp *http.Response) (result OpenShiftManagedClusterListResult, err error) {
+	err = autorest.Respond(
+		resp,
+		client.ByInspecting(),
+		azure.WithErrorUnlessStatusCode(http.StatusOK),
+		autorest.ByUnmarshallingJSON(&result),
+		autorest.ByClosing())
+	result.Response = autorest.Response{Response: resp}
+	return
+}
+
+// listNextResults retrieves the next set of results, if any.
+func (client OpenShiftManagedClustersClient) listNextResults(ctx context.Context, lastResults OpenShiftManagedClusterListResult) (result OpenShiftManagedClusterListResult, err error) {
+	req, err := lastResults.openShiftManagedClusterListResultPreparer(ctx)
+	if err != nil {
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listNextResults", nil, "Failure preparing next results request")
+	}
+	if req == nil {
+		return
+	}
+	resp, err := client.ListSender(req)
+	if err != nil {
+		result.Response = autorest.Response{Response: resp}
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listNextResults", resp, "Failure sending next results request")
+	}
+	result, err = client.ListResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listNextResults", resp, "Failure responding to next results request")
+	}
+	return
+}
+
+// ListComplete enumerates all values, automatically crossing page boundaries as required.
+func (client OpenShiftManagedClustersClient) ListComplete(ctx context.Context) (result OpenShiftManagedClusterListResultIterator, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.List")
+		defer func() {
+			sc := -1
+			if result.Response().Response.Response != nil {
+				sc = result.page.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.page, err = client.List(ctx)
+	return
+}
+
+// ListByResourceGroup lists OpenShift managed clusters in the specified subscription and resource group. The operation
+// returns properties of each OpenShift managed cluster.
+// Parameters:
+// resourceGroupName - the name of the resource group.
+func (client OpenShiftManagedClustersClient) ListByResourceGroup(ctx context.Context, resourceGroupName string) (result OpenShiftManagedClusterListResultPage, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.ListByResourceGroup")
+		defer func() {
+			sc := -1
+			if result.osmclr.Response.Response != nil {
+				sc = result.osmclr.Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.fn = client.listByResourceGroupNextResults
+	req, err := client.ListByResourceGroupPreparer(ctx, resourceGroupName)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "ListByResourceGroup", nil, "Failure preparing request")
+		return
+	}
+
+	resp, err := client.ListByResourceGroupSender(req)
+	if err != nil {
+		result.osmclr.Response = autorest.Response{Response: resp}
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "ListByResourceGroup", resp, "Failure sending request")
+		return
+	}
+
+	result.osmclr, err = client.ListByResourceGroupResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "ListByResourceGroup", resp, "Failure responding to request")
+	}
+
+	return
+}
+
+// ListByResourceGroupPreparer prepares the ListByResourceGroup request.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupPreparer(ctx context.Context, resourceGroupName string) (*http.Request, error) {
+	pathParameters := map[string]interface{}{
+		"resourceGroupName": autorest.Encode("path", resourceGroupName),
+		"subscriptionId":    autorest.Encode("path", client.SubscriptionID),
+	}
+
+	const APIVersion = "2018-09-30-preview"
+	queryParameters := map[string]interface{}{
+		"api-version": APIVersion,
+	}
+
+	preparer := autorest.CreatePreparer(
+		autorest.AsGet(),
+		autorest.WithBaseURL(client.BaseURI),
+		autorest.WithPathParameters("/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ContainerService/openShiftManagedClusters", pathParameters),
+		autorest.WithQueryParameters(queryParameters))
+	return preparer.Prepare((&http.Request{}).WithContext(ctx))
+}
+
+// ListByResourceGroupSender sends the ListByResourceGroup request. The method will close the
+// http.Response Body if it receives an error.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupSender(req *http.Request) (*http.Response, error) {
+	return autorest.SendWithSender(client, req,
+		azure.DoRetryWithRegistration(client.Client))
+}
+
+// ListByResourceGroupResponder handles the response to the ListByResourceGroup request. The method always
+// closes the http.Response Body.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupResponder(resp *http.Response) (result OpenShiftManagedClusterListResult, err error) {
+	err = autorest.Respond(
+		resp,
+		client.ByInspecting(),
+		azure.WithErrorUnlessStatusCode(http.StatusOK),
+		autorest.ByUnmarshallingJSON(&result),
+		autorest.ByClosing())
+	result.Response = autorest.Response{Response: resp}
+	return
+}
+
+// listByResourceGroupNextResults retrieves the next set of results, if any.
+func (client OpenShiftManagedClustersClient) listByResourceGroupNextResults(ctx context.Context, lastResults OpenShiftManagedClusterListResult) (result OpenShiftManagedClusterListResult, err error) {
+	req, err := lastResults.openShiftManagedClusterListResultPreparer(ctx)
+	if err != nil {
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listByResourceGroupNextResults", nil, "Failure preparing next results request")
+	}
+	if req == nil {
+		return
+	}
+	resp, err := client.ListByResourceGroupSender(req)
+	if err != nil {
+		result.Response = autorest.Response{Response: resp}
+		return result, autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listByResourceGroupNextResults", resp, "Failure sending next results request")
+	}
+	result, err = client.ListByResourceGroupResponder(resp)
+	if err != nil {
+		err = autorest.NewErrorWithError(err, "containerservice.OpenShiftManagedClustersClient", "listByResourceGroupNextResults", resp, "Failure responding to next results request")
+	}
+	return
+}
+
+// ListByResourceGroupComplete enumerates all values, automatically crossing page boundaries as required.
+func (client OpenShiftManagedClustersClient) ListByResourceGroupComplete(ctx context.Context, resourceGroupName string) (result OpenShiftManagedClusterListResultIterator, err error) {
+	if tracing.IsEnabled() {
+		ctx = tracing.StartSpan(ctx, fqdn+"/OpenShiftManagedClustersClient.ListByResourceGroup")
+		defer func() {
+			sc := -1
+			if result.Response().Response.Response != nil {
+				sc = result.page.Response().Response.Response.StatusCode
+			}
+			tracing.EndSpan(ctx, sc, err)
+		}()
+	}
+	result.page, err = client.ListByResourceGroup(ctx, resourceGroupName)
+	return
+}
+
 // UpdateTags updates an openshift managed cluster with the specified tags.
 // Parameters:
 // resourceGroupName - the name of the resource group.