Delete outdated deployments.

cluster-autoscaler/cloudprovider/azure/azure_agent_pool.go

@@ -34,10 +34,13 @@ import (
 	"k8s.io/autoscaler/cluster-autoscaler/config/dynamic"
 	"k8s.io/klog"
 	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
 )
 
-var (
-	vmInstancesRefreshPeriod = 5 * time.Minute
+const (
+	vmInstancesRefreshPeriod                                = 5 * time.Minute
+	clusterAutoscalerDeploymentPrefix                       = `cluster-autoscaler-`
+	defaultMaxDeploymentsCount = 10
 )
 
 var virtualMachinesStatusCache struct {
@@ -209,6 +212,62 @@ func (as *AgentPool) TargetSize() (int, error) {
 	return int(size), nil
 }
 
+func (as *AgentPool) getAllSucceededAndFailedDeployments() (succeededAndFailedDeployments []resources.DeploymentExtended, err error) {
+	ctx, cancel := getContextWithCancel()
+	defer cancel()
+
+	deploymentsFilter := "provisioningState eq 'Succeeded' or provisioningState eq 'Failed'"
+	succeededAndFailedDeployments, err = as.manager.azClient.deploymentsClient.List(ctx, as.manager.config.ResourceGroup, deploymentsFilter, nil)
+	if err != nil {
+		klog.Errorf("getAllSucceededAndFailedDeployments: failed to list succeeded or failed deployments with error: %v", err)
+		return nil, err
+	}
+
+	return succeededAndFailedDeployments, err
+}
+
+// deleteOutdatedDeployments keeps the newest deployments in the resource group and delete others,
+// since Azure resource group deployments have a hard cap of 800, outdated deployments must be deleted
+// to prevent the `DeploymentQuotaExceeded` error. see: issue #2154.
+func (as *AgentPool) deleteOutdatedDeployments() (err error) {
+	deployments, err := as.getAllSucceededAndFailedDeployments()
+	if err != nil {
+		return err
+	}
+
+	for i := len(deployments) - 1; i >= 0; i-- {
+		klog.V(4).Infof("deleteOutdatedDeployments: found deployments[i].Name: %s", *deployments[i].Name)
+		if deployments[i].Name != nil && !strings.HasPrefix(*deployments[i].Name, clusterAutoscalerDeploymentPrefix) {
+			deployments = append(deployments[:i], deployments[i+1:]...)
+		}
+	}
+
+	if int64(len(deployments)) <= as.manager.config.MaxDeploymentsCount {
+		klog.V(4).Infof("deleteOutdatedDeployments: the number of deployments (%d) is under threshold, skip deleting", len(deployments))
+		return err
+	}
+
+	sort.Slice(deployments, func(i, j int) bool {
+		return deployments[i].Properties.Timestamp.Time.After(deployments[j].Properties.Timestamp.Time)
+	})
+
+	toBeDeleted := deployments[as.manager.config.MaxDeploymentsCount:]
+
+	ctx, cancel := getContextWithCancel()
+	defer cancel()
+
+	errList := make([]error, 0)
+	for _, deployment := range toBeDeleted {
+		klog.V(4).Infof("deleteOutdatedDeployments: starts deleting outdated deployment (%s)", *deployment.Name)
+		_, err := as.manager.azClient.deploymentsClient.Delete(ctx, as.manager.config.ResourceGroup, *deployment.Name)
+		if err != nil {
+			errList = append(errList, err)
+		}
+	}
+
+	return utilerrors.NewAggregate(errList)
+}
+
 // IncreaseSize increases agent pool size
 func (as *AgentPool) IncreaseSize(delta int) error {
 	as.mutex.Lock()
@@ -218,6 +277,11 @@ func (as *AgentPool) IncreaseSize(delta int) error {
 		return fmt.Errorf("size increase must be positive")
 	}
 
+	err := as.deleteOutdatedDeployments()
+	if err != nil {
+		klog.Warningf("IncreaseSize: failed to cleanup outdated deployments with err: %v.", err)
+	}
+
 	indexes, _, err := as.GetVMIndexes()
 	if err != nil {
 		return err
@@ -404,6 +468,11 @@ func (as *AgentPool) DeleteNodes(nodes []*apiv1.Node) error {
 		refs = append(refs, ref)
 	}
 
+	err = as.deleteOutdatedDeployments()
+	if err != nil {
+		klog.Warningf("DeleteNodes: failed to cleanup outdated deployments with err: %v.", err)
+	}
+
 	return as.DeleteInstances(refs)
 }
 

cluster-autoscaler/cloudprovider/azure/azure_agent_pool_test.go

@@ -0,0 +1,121 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+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.
+*/
+
+package azure
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/Azure/azure-sdk-for-go/services/resources/mgmt/2017-05-10/resources"
+	"github.com/Azure/go-autorest/autorest/date"
+	"github.com/Azure/go-autorest/autorest/to"
+	"github.com/stretchr/testify/assert"
+)
+
+func newTestAgentPool(manager *AzureManager, name string) *AgentPool {
+	return &AgentPool{
+		azureRef: azureRef{
+			Name: name,
+		},
+		manager: manager,
+		minSize: 1,
+		maxSize: 5,
+	}
+}
+
+func TestDeleteOutdatedDeployments(t *testing.T) {
+	timeLayout := "2006-01-02 15:04:05"
+	timeBenchMark, _ := time.Parse(timeLayout, "2000-01-01 00:00:00")
+
+	testCases := []struct {
+		deployments         map[string]resources.DeploymentExtended
+		expectedDeployments []resources.DeploymentExtended
+		expectedErr         error
+		desc                string
+	}{
+		{
+			deployments: map[string]resources.DeploymentExtended{
+				"non-cluster-autoscaler-0000": {
+					Name: to.StringPtr("non-cluster-autoscaler-0000"),
+					Properties: &resources.DeploymentPropertiesExtended{
+						ProvisioningState: to.StringPtr("Succeeded"),
+						Timestamp:         &date.Time{Time: timeBenchMark.Add(2 * time.Minute)},
+					},
+				},
+				"cluster-autoscaler-0000": {
+					Name: to.StringPtr("cluster-autoscaler-0000"),
+					Properties: &resources.DeploymentPropertiesExtended{
+						ProvisioningState: to.StringPtr("Succeeded"),
+						Timestamp:         &date.Time{Time: timeBenchMark},
+					},
+				},
+				"cluster-autoscaler-0001": {
+					Name: to.StringPtr("cluster-autoscaler-0001"),
+					Properties: &resources.DeploymentPropertiesExtended{
+						ProvisioningState: to.StringPtr("Succeeded"),
+						Timestamp:         &date.Time{Time: timeBenchMark.Add(time.Minute)},
+					},
+				},
+				"cluster-autoscaler-0002": {
+					Name: to.StringPtr("cluster-autoscaler-0002"),
+					Properties: &resources.DeploymentPropertiesExtended{
+						ProvisioningState: to.StringPtr("Succeeded"),
+						Timestamp:         &date.Time{Time: timeBenchMark.Add(2 * time.Minute)},
+					},
+				},
+			},
+			expectedDeployments: []resources.DeploymentExtended{
+				{
+					Name: to.StringPtr("non-cluster-autoscaler-0000"),
+					Properties: &resources.DeploymentPropertiesExtended{
+						ProvisioningState: to.StringPtr("Succeeded"),
+						Timestamp:         &date.Time{Time: timeBenchMark.Add(2 * time.Minute)},
+					},
+				},
+				{
+					Name: to.StringPtr("cluster-autoscaler-0001"),
+					Properties: &resources.DeploymentPropertiesExtended{
+						ProvisioningState: to.StringPtr("Succeeded"),
+						Timestamp:         &date.Time{Time: timeBenchMark.Add(time.Minute)},
+					},
+				},
+				{
+					Name: to.StringPtr("cluster-autoscaler-0002"),
+					Properties: &resources.DeploymentPropertiesExtended{
+						ProvisioningState: to.StringPtr("Succeeded"),
+						Timestamp:         &date.Time{Time: timeBenchMark.Add(2 * time.Minute)},
+					},
+				},
+			},
+			expectedErr: nil,
+			desc:        "cluster autoscaler provider azure should delete outdated deployments created by cluster autoscaler",
+		},
+	}
+
+	for _, test := range testCases {
+		testAS := newTestAgentPool(newTestAzureManager(t), "testAS")
+		testAS.manager.azClient.deploymentsClient = &DeploymentsClientMock{
+			FakeStore: test.deployments,
+		}
+
+		err := testAS.deleteOutdatedDeployments()
+		assert.Equal(t, test.expectedErr, err, test.desc)
+		existedDeployments, err := testAS.manager.azClient.deploymentsClient.List(context.Background(), "", "", to.Int32Ptr(0))
+		assert.Equal(t, test.expectedDeployments, existedDeployments, test.desc)
+	}
+}

cluster-autoscaler/cloudprovider/azure/azure_client.go

@@ -63,8 +63,10 @@ type InterfacesClient interface {
 // DeploymentsClient defines needed functions for azure network.DeploymentsClient.
 type DeploymentsClient interface {
 	Get(ctx context.Context, resourceGroupName string, deploymentName string) (result resources.DeploymentExtended, err error)
+	List(ctx context.Context, resourceGroupName string, filter string, top *int32) (result []resources.DeploymentExtended, err error)
 	ExportTemplate(ctx context.Context, resourceGroupName string, deploymentName string) (result resources.DeploymentExportResult, err error)
 	CreateOrUpdate(ctx context.Context, resourceGroupName string, deploymentName string, parameters resources.Deployment) (resp *http.Response, err error)
+	Delete(ctx context.Context, resourceGroupName string, deploymentName string) (resp *http.Response, err error)
 }
 
 // DisksClient defines needed functions for azure disk.DisksClient.
@@ -349,6 +351,44 @@ func (az *azDeploymentsClient) CreateOrUpdate(ctx context.Context, resourceGroup
 	return future.Response(), err
 }
 
+func (az *azDeploymentsClient) List(ctx context.Context, resourceGroupName, filter string, top *int32) (result []resources.DeploymentExtended, err error) {
+	klog.V(10).Infof("azDeploymentsClient.List(%q): start", resourceGroupName)
+	defer func() {
+		klog.V(10).Infof("azDeploymentsClient.List(%q): end", resourceGroupName)
+	}()
+
+	iterator, err := az.client.ListByResourceGroupComplete(ctx, resourceGroupName, filter, top)
+	if err != nil {
+		return nil, err
+	}
+
+	result = make([]resources.DeploymentExtended, 0)
+	for ; iterator.NotDone(); err = iterator.Next() {
+		if err != nil {
+			return nil, err
+		}
+
+		result = append(result, iterator.Value())
+	}
+
+	return result, err
+}
+
+func (az *azDeploymentsClient) Delete(ctx context.Context, resourceGroupName, deploymentName string) (resp *http.Response, err error) {
+	klog.V(10).Infof("azDeploymentsClient.Delete(%q,%q): start", resourceGroupName, deploymentName)
+	defer func() {
+		klog.V(10).Infof("azDeploymentsClient.Delete(%q,%q): end", resourceGroupName, deploymentName)
+	}()
+
+	future, err := az.client.Delete(ctx, resourceGroupName, deploymentName)
+	if err != nil {
+		return future.Response(), err
+	}
+
+	err = future.WaitForCompletionRef(ctx, az.client.Client)
+	return future.Response(), err
+}
+
 type azDisksClient struct {
 	client compute.DisksClient
 }

cluster-autoscaler/cloudprovider/azure/azure_cloud_provider_test.go

@@ -39,6 +39,7 @@ func newTestAzureManager(t *testing.T) *AzureManager {
 		config: &Config{
 			ResourceGroup: "test",
 			VMType:        vmTypeVMSS,
+			MaxDeploymentsCount: 2,
 		},
 
 		azClient: &azClient{

cluster-autoscaler/cloudprovider/azure/azure_fakes.go

@@ -258,3 +258,30 @@ func (m *DeploymentsClientMock) CreateOrUpdate(ctx context.Context, resourceGrou
 	deploy.Properties.Template = parameters.Properties.Template
 	return nil, nil
 }
+
+// List gets all the deployments for a resource group.
+func (m *DeploymentsClientMock) List(ctx context.Context, resourceGroupName, filter string, top *int32) (result []resources.DeploymentExtended, err error) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	result = make([]resources.DeploymentExtended, 0)
+	for i := range m.FakeStore {
+		result = append(result, m.FakeStore[i])
+	}
+
+	return result, nil
+}
+
+// Delete deletes the given deployment
+func (m *DeploymentsClientMock) Delete(ctx context.Context, resourceGroupName, deploymentName string) (resp *http.Response, err error) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	if _, ok := m.FakeStore[deploymentName]; !ok {
+		return nil, fmt.Errorf("there is no such a deployment with name %s", deploymentName)
+	}
+
+	delete(m.FakeStore, deploymentName)
+
+	return
+}

cluster-autoscaler/cloudprovider/azure/azure_manager.go

@@ -106,6 +106,9 @@ type Config struct {
 
 	// ASG cache TTL in seconds
 	AsgCacheTTL int64 `json:"asgCacheTTL" yaml:"asgCacheTTL"`
+
+	// number of latest deployments that will not be deleted
+	MaxDeploymentsCount int64 `json:"clusterAutoscalerDeploymentOutdateCountThreshold" yaml:"ClusterAutoscalerDeploymentOutdateCountThreshold"`
 }
 
 // TrimSpace removes all leading and trailing white spaces.
@@ -171,6 +174,13 @@ func CreateAzureManager(configReader io.Reader, discoveryOpts cloudprovider.Node
 				return nil, fmt.Errorf("failed to parse AZURE_ASG_CACHE_TTL %q: %v", asgCacheTTL, err)
 			}
 		}
+
+		if threshold := os.Getenv("AZURE_MAX_DEPLOYMENT_COUNT"); threshold != "" {
+			cfg.MaxDeploymentsCount, err = strconv.ParseInt(threshold, 10, 0)
+			if err != nil {
+				return nil, fmt.Errorf("failed to parse AZURE_MAX_DEPLOYMENT_COUNT %q: %v", threshold, err)
+			}
+		}
 	}
 	cfg.TrimSpace()
 
@@ -194,6 +204,10 @@ func CreateAzureManager(configReader io.Reader, discoveryOpts cloudprovider.Node
 		cfg.AsgCacheTTL = int64(defaultAsgCacheTTL)
 	}
 
+	if cfg.MaxDeploymentsCount == 0 {
+		cfg.MaxDeploymentsCount = int64(defaultMaxDeploymentsCount)
+	}
+
 	// Defaulting env to Azure Public Cloud.
 	env := azure.PublicCloud
 	if cfg.Cloud != "" {

cluster-autoscaler/cloudprovider/azure/azure_manager_test.go

@@ -37,14 +37,15 @@ const validAzureCfg = `{
 	"vnetName": "fakeName",
 	"routeTableName": "fakeName",
 	"primaryAvailabilitySetName": "fakeName",
-	"asgCacheTTL": 900}`
+	"asgCacheTTL": 900,
+	"MaxDeploymentsCount": 8}`
 
 const invalidAzureCfg = `{{}"cloud": "AzurePublicCloud",}`
 
 func TestCreateAzureManagerValidConfig(t *testing.T) {
 	manager, err := CreateAzureManager(strings.NewReader(validAzureCfg), cloudprovider.NodeGroupDiscoveryOptions{})
 
-	expectdConfig := &Config{
+	expectedConfig := &Config{
 		Cloud:           "AzurePublicCloud",
 		TenantID:        "fakeId",
 		SubscriptionID:  "fakeId",
@@ -53,10 +54,11 @@ func TestCreateAzureManagerValidConfig(t *testing.T) {
 		AADClientID:     "fakeId",
 		AADClientSecret: "fakeId",
 		AsgCacheTTL:     900,
+		MaxDeploymentsCount: 8,
 	}
 
 	assert.NoError(t, err)
-	assert.Equal(t, expectdConfig, manager.config, "unexpected azure manager configuration")
+	assert.Equal(t, expectedConfig, manager.config, "unexpected azure manager configuration")
 }
 
 func TestCreateAzureManagerInvalidConfig(t *testing.T) {