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controlplane.go
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controlplane.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 awsbotanist
import (
"fmt"
"path/filepath"
"github.com/gardener/gardener/pkg/operation/common"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
apierrors "k8s.io/apimachinery/pkg/api/errors"
)
const cloudProviderConfigTemplate = `
[Global]
VPC=%q
SubnetID=%q
DisableSecurityGroupIngress=true
KubernetesClusterTag=%q
KubernetesClusterID=%q
Zone=%q
`
// GenerateCloudProviderConfig generates the AWS cloud provider config.
// See this for more details:
// https://github.com/kubernetes/kubernetes/blob/master/pkg/cloudprovider/providers/aws/aws.go
func (b *AWSBotanist) GenerateCloudProviderConfig() (string, error) {
var (
vpcID = "vpc_id"
subnetID = "subnet_public_utility_z0"
)
tf, err := b.NewShootTerraformer(common.TerraformerPurposeInfra)
if err != nil {
return "", err
}
stateVariables, err := tf.GetStateOutputVariables(vpcID, subnetID)
if err != nil {
return "", err
}
return fmt.Sprintf(
cloudProviderConfigTemplate,
stateVariables[vpcID],
stateVariables[subnetID],
b.Shoot.SeedNamespace,
b.Shoot.SeedNamespace,
b.Shoot.Info.Spec.Cloud.AWS.Zones[0],
), nil
}
// RefreshCloudProviderConfig refreshes the cloud provider credentials in the existing cloud
// provider config.
// Not needed on AWS (cloud provider config does not contain the credentials), hence, the
// original is returned back.
func (b *AWSBotanist) RefreshCloudProviderConfig(currentConfig map[string]string) map[string]string {
return currentConfig
}
// GenerateKubeAPIServerServiceConfig generates the cloud provider specific values which are required to render the
// Service manifest of the kube-apiserver-service properly.
func (b *AWSBotanist) GenerateKubeAPIServerServiceConfig() (map[string]interface{}, error) {
return map[string]interface{}{
"annotations": map[string]interface{}{
"service.beta.kubernetes.io/aws-load-balancer-connection-idle-timeout": "3600",
"service.beta.kubernetes.io/aws-load-balancer-backend-protocol": "ssl",
"service.beta.kubernetes.io/aws-load-balancer-ssl-ports": "443",
"service.beta.kubernetes.io/aws-load-balancer-healthcheck-timeout": "5",
"service.beta.kubernetes.io/aws-load-balancer-healthcheck-interval": "30",
"service.beta.kubernetes.io/aws-load-balancer-healthcheck-healthy-threshold": "2",
"service.beta.kubernetes.io/aws-load-balancer-healthcheck-unhealthy-threshold": "2",
"service.beta.kubernetes.io/aws-load-balancer-ssl-negotiation-policy": "ELBSecurityPolicy-TLS-1-2-2017-01",
},
}, nil
}
// GenerateKubeAPIServerExposeConfig defines the cloud provider specific values which configure how the kube-apiserver
// is exposed to the public.
func (b *AWSBotanist) GenerateKubeAPIServerExposeConfig() (map[string]interface{}, error) {
// For older versions of Gardener the old readvertiser would be deployed which is incompatible with the way we
// configure the kube-apiserver now, therefore, we need to check if the version is < 0.4.0.
mustDeleteOldReadvertiser := false
readvertiserDeployment, err := b.K8sSeedClient.GetDeployment(b.Shoot.SeedNamespace, common.AWSLBReadvertiserDeploymentName)
if err == nil {
mustDeleteOldReadvertiser = true
} else if !apierrors.IsNotFound(err) {
return nil, err
}
if mustDeleteOldReadvertiser {
validDeploymentVersion, err := kutil.ValidDeploymentContainerImageVersion(readvertiserDeployment, "aws-lb-readvertiser", "0.4.0")
if err != nil {
return nil, err
}
// If the version is less than the 0.4.0, delete the old readvertiser deployment to prevent modifications of the kube-apiserver deployment.
if !validDeploymentVersion {
b.Logger.Info("Detected an old version of the aws-lb-readvertiser, deleting it")
if err := b.K8sSeedClient.DeleteDeployment(b.Shoot.SeedNamespace, common.AWSLBReadvertiserDeploymentName); err != nil && !apierrors.IsNotFound(err) {
return nil, err
}
}
}
return map[string]interface{}{
"endpointReconcilerType": "none",
}, nil
}
// GenerateKubeAPIServerConfig generates the cloud provider specific values which are required to render the
// Deployment manifest of the kube-apiserver properly.
func (b *AWSBotanist) GenerateKubeAPIServerConfig() (map[string]interface{}, error) {
return nil, nil
}
// GenerateCloudControllerManagerConfig generates the cloud provider specific values which are required to
// render the Deployment manifest of the cloud-controller-manager properly.
func (b *AWSBotanist) GenerateCloudControllerManagerConfig() (map[string]interface{}, string, error) {
return map[string]interface{}{
"configureRoutes": false,
"environment": getAWSCredentialsEnvironment(),
}, common.CloudControllerManagerDeploymentName, nil
}
// GenerateKubeControllerManagerConfig generates the cloud provider specific values which are required to
// render the Deployment manifest of the kube-controller-manager properly.
func (b *AWSBotanist) GenerateKubeControllerManagerConfig() (map[string]interface{}, error) {
return map[string]interface{}{
"environment": getAWSCredentialsEnvironment(),
}, nil
}
// GenerateKubeSchedulerConfig generates the cloud provider specific values which are required to render the
// Deployment manifest of the kube-scheduler properly.
func (b *AWSBotanist) GenerateKubeSchedulerConfig() (map[string]interface{}, error) {
return nil, nil
}
// GenerateCSIConfig generates the configuration for CSI charts
func (b *AWSBotanist) GenerateCSIConfig() (map[string]interface{}, error) {
return nil, nil
}
// maps are mutable, so it's safer to create a new instance
func getAWSCredentialsEnvironment() []map[string]interface{} {
return []map[string]interface{}{
{
"name": "AWS_ACCESS_KEY_ID",
"valueFrom": map[string]interface{}{
"secretKeyRef": map[string]interface{}{
"key": AccessKeyID,
"name": common.CloudProviderSecretName,
},
},
},
{
"name": "AWS_SECRET_ACCESS_KEY",
"valueFrom": map[string]interface{}{
"secretKeyRef": map[string]interface{}{
"key": SecretAccessKey,
"name": common.CloudProviderSecretName,
},
},
},
}
}
// GenerateEtcdBackupConfig returns the etcd backup configuration for the etcd Helm chart.
func (b *AWSBotanist) GenerateEtcdBackupConfig() (map[string][]byte, map[string]interface{}, error) {
bucketName := "bucketName"
tf, err := b.NewBackupInfrastructureTerraformer()
if err != nil {
return nil, nil, err
}
stateVariables, err := tf.GetStateOutputVariables(bucketName)
if err != nil {
return nil, nil, err
}
secretData := map[string][]byte{
Region: []byte(b.Seed.Info.Spec.Cloud.Region),
AccessKeyID: b.Seed.Secret.Data[AccessKeyID],
SecretAccessKey: b.Seed.Secret.Data[SecretAccessKey],
}
backupConfigData := map[string]interface{}{
"schedule": b.Operation.ShootBackup.Schedule,
"storageProvider": "S3",
"storageContainer": stateVariables[bucketName],
"backupSecret": common.BackupSecretName,
"env": []map[string]interface{}{
{
"name": "AWS_REGION",
"valueFrom": map[string]interface{}{
"secretKeyRef": map[string]interface{}{
"name": common.BackupSecretName,
"key": Region,
},
},
},
{
"name": "AWS_SECRET_ACCESS_KEY",
"valueFrom": map[string]interface{}{
"secretKeyRef": map[string]interface{}{
"name": common.BackupSecretName,
"key": SecretAccessKey,
},
},
},
{
"name": "AWS_ACCESS_KEY_ID",
"valueFrom": map[string]interface{}{
"secretKeyRef": map[string]interface{}{
"name": common.BackupSecretName,
"key": AccessKeyID,
},
},
},
},
"volumeMount": []map[string]interface{}{},
}
return secretData, backupConfigData, nil
}
// DeployCloudSpecificControlPlane updates the AWS ELB health check to SSL and deploys the aws-lb-readvertiser.
// https://github.com/gardener/aws-lb-readvertiser
func (b *AWSBotanist) DeployCloudSpecificControlPlane() error {
var (
name = "aws-lb-readvertiser"
defaultValues = map[string]interface{}{
"domain": b.APIServerAddress,
"replicas": b.Shoot.GetReplicas(1),
"podAnnotations": map[string]interface{}{
"checksum/secret-aws-lb-readvertiser": b.CheckSums[name],
},
}
)
values, err := b.InjectImages(defaultValues, b.SeedVersion(), b.ShootVersion(), common.AWSLBReadvertiserImageName)
if err != nil {
return err
}
return b.ApplyChartSeed(filepath.Join(common.ChartPath, "seed-controlplane", "charts", name), name, b.Shoot.SeedNamespace, nil, values)
}