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infrastructure.go
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infrastructure.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"
"time"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/operation/terraformer"
"github.com/gardener/gardener/pkg/utils/flow"
apierrors "k8s.io/apimachinery/pkg/api/errors"
)
// DeployInfrastructure kicks off a Terraform job which deploys the infrastructure.
func (b *AWSBotanist) DeployInfrastructure() error {
var (
createVPC = true
vpcID = "${aws_vpc.vpc.id}"
internetGatewayID = "${aws_internet_gateway.igw.id}"
vpcCIDR = ""
)
// check if we should use an existing VPC or create a new one
if b.Shoot.Info.Spec.Cloud.AWS.Networks.VPC.ID != nil {
createVPC = false
vpcID = *b.Shoot.Info.Spec.Cloud.AWS.Networks.VPC.ID
igwID, err := b.AWSClient.GetInternetGateway(vpcID)
if err != nil {
return err
}
internetGatewayID = igwID
} else if b.Shoot.Info.Spec.Cloud.AWS.Networks.VPC.CIDR != nil {
vpcCIDR = string(*b.Shoot.Info.Spec.Cloud.AWS.Networks.VPC.CIDR)
}
tf, err := b.NewShootTerraformer(common.TerraformerPurposeInfra)
if err != nil {
return err
}
return tf.
SetVariablesEnvironment(b.generateTerraformInfraVariablesEnvironment()).
InitializeWith(b.ChartInitializer("aws-infra", b.generateTerraformInfraConfig(createVPC, vpcID, internetGatewayID, vpcCIDR))).
Apply()
}
// DestroyInfrastructure kicks off a Terraform job which destroys the infrastructure.
func (b *AWSBotanist) DestroyInfrastructure() error {
tf, err := b.NewShootTerraformer(common.TerraformerPurposeInfra)
if err != nil {
return err
}
configExists, err := tf.ConfigExists()
if err != nil {
return err
}
var (
g = flow.NewGraph("AWS infrastructure destruction")
destroyKubernetesLoadBalancersAndSecurityGroups = g.Add(flow.Task{
Name: "Destroying Kubernetes load balancers and security groups",
Fn: flow.SimpleTaskFn(b.destroyKubernetesLoadBalancersAndSecurityGroups).RetryUntilTimeout(10*time.Second, 5*time.Minute).DoIf(configExists),
})
_ = g.Add(flow.Task{
Name: "Destroying Shoot infrastructure",
Fn: flow.SimpleTaskFn(tf.SetVariablesEnvironment(b.generateTerraformInfraVariablesEnvironment()).Destroy),
Dependencies: flow.NewTaskIDs(destroyKubernetesLoadBalancersAndSecurityGroups),
})
f = g.Compile()
)
return f.Run(flow.Opts{Logger: b.Logger})
}
// generateTerraformInfraVariablesEnvironment generates the environment containing the credentials which
// are required to validate/apply/destroy the Terraform configuration. These environment must contain
// Terraform variables which are prefixed with TF_VAR_.
func (b *AWSBotanist) generateTerraformInfraVariablesEnvironment() map[string]string {
return common.GenerateTerraformVariablesEnvironment(b.Shoot.Secret, map[string]string{
"ACCESS_KEY_ID": AccessKeyID,
"SECRET_ACCESS_KEY": SecretAccessKey,
})
}
// generateTerraformInfraConfig creates the Terraform variables and the Terraform config (for the infrastructure)
// and returns them (these values will be stored as a ConfigMap and a Secret in the Garden cluster.
func (b *AWSBotanist) generateTerraformInfraConfig(createVPC bool, vpcID, internetGatewayID, vpcCIDR string) map[string]interface{} {
var (
sshSecret = b.Secrets["ssh-keypair"]
dhcpDomainName = "ec2.internal"
zones = []map[string]interface{}{}
)
if b.Shoot.Info.Spec.Cloud.Region != "us-east-1" {
dhcpDomainName = fmt.Sprintf("%s.compute.internal", b.Shoot.Info.Spec.Cloud.Region)
}
for zoneIndex, zone := range b.Shoot.Info.Spec.Cloud.AWS.Zones {
zones = append(zones, map[string]interface{}{
"name": zone,
"cidr": map[string]interface{}{
"worker": b.Shoot.Info.Spec.Cloud.AWS.Networks.Workers[zoneIndex],
"public": b.Shoot.Info.Spec.Cloud.AWS.Networks.Public[zoneIndex],
"internal": b.Shoot.Info.Spec.Cloud.AWS.Networks.Internal[zoneIndex],
},
})
}
return map[string]interface{}{
"aws": map[string]interface{}{
"region": b.Shoot.Info.Spec.Cloud.Region,
},
"create": map[string]interface{}{
"vpc": createVPC,
},
"sshPublicKey": string(sshSecret.Data["id_rsa.pub"]),
"vpc": map[string]interface{}{
"id": vpcID,
"cidr": vpcCIDR,
"dhcpDomainName": dhcpDomainName,
"internetGatewayID": internetGatewayID,
},
"clusterName": b.Shoot.SeedNamespace,
"zones": zones,
}
}
func (b *AWSBotanist) destroyKubernetesLoadBalancersAndSecurityGroups() error {
t, err := b.NewShootTerraformer(common.TerraformerPurposeInfra)
if err != nil {
return err
}
if _, err := t.GetState(); err != nil {
if apierrors.IsNotFound(err) {
return nil
}
return err
}
vpcIDKey := "vpc_id"
stateVariables, err := t.GetStateOutputVariables(vpcIDKey)
if err != nil {
if terraformer.IsVariablesNotFoundError(err) {
b.Logger.Infof("Skipping explicit AWS load balancer and security group deletion because not all variables have been found in the Terraform state.")
return nil
}
return err
}
vpcID := stateVariables[vpcIDKey]
// Find load balancers and security groups.
loadBalancers, err := b.AWSClient.ListKubernetesELBs(vpcID, b.Shoot.SeedNamespace)
if err != nil {
return err
}
securityGroups, err := b.AWSClient.ListKubernetesSecurityGroups(vpcID, b.Shoot.SeedNamespace)
if err != nil {
return err
}
// Destroy load balancers and security groups.
for _, loadBalancerName := range loadBalancers {
if err := b.AWSClient.DeleteELB(loadBalancerName); err != nil {
return err
}
}
for _, securityGroupID := range securityGroups {
if err := b.AWSClient.DeleteSecurityGroup(securityGroupID); err != nil {
return err
}
}
return nil
}
// DeployBackupInfrastructure kicks off a Terraform job which deploys the infrastructure resources for backup.
// It sets up the User and the Bucket to store the backups. Allocate permission to the User to access the bucket.
func (b *AWSBotanist) DeployBackupInfrastructure() error {
tf, err := b.NewBackupInfrastructureTerraformer()
if err != nil {
return err
}
return tf.
SetVariablesEnvironment(b.generateTerraformBackupVariablesEnvironment()).
InitializeWith(b.ChartInitializer("aws-backup", b.generateTerraformBackupConfig())).
Apply()
}
// DestroyBackupInfrastructure kicks off a Terraform job which destroys the infrastructure for etcd backup.
func (b *AWSBotanist) DestroyBackupInfrastructure() error {
tf, err := b.NewBackupInfrastructureTerraformer()
if err != nil {
return err
}
return tf.
SetVariablesEnvironment(b.generateTerraformBackupVariablesEnvironment()).
Destroy()
}
// generateTerraformBackupVariablesEnvironment generates the environment containing the credentials which
// are required to validate/apply/destroy the Terraform configuration. These environment must contain
// Terraform variables which are prefixed with TF_VAR_.
func (b *AWSBotanist) generateTerraformBackupVariablesEnvironment() map[string]string {
return common.GenerateTerraformVariablesEnvironment(b.Seed.Secret, map[string]string{
"ACCESS_KEY_ID": AccessKeyID,
"SECRET_ACCESS_KEY": SecretAccessKey,
})
}
// generateTerraformBackupConfig creates the Terraform variables and the Terraform config (for the backup)
// and returns them.
func (b *AWSBotanist) generateTerraformBackupConfig() map[string]interface{} {
return map[string]interface{}{
"aws": map[string]interface{}{
"region": b.Seed.Info.Spec.Cloud.Region,
},
"bucket": map[string]interface{}{
"name": b.Operation.BackupInfrastructure.Name,
},
"clusterName": b.Operation.BackupInfrastructure.Name,
}
}