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dns.go
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dns.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 botanist
import (
"context"
"fmt"
"path/filepath"
"strings"
"time"
"github.com/gardener/gardener/pkg/apis/core"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/utils/flow"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/retry"
dnsv1alpha1 "github.com/gardener/external-dns-management/pkg/apis/dns/v1alpha1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
)
var dnsChartPath = filepath.Join(common.ChartPath, "seed-dns")
const (
// DNSInternalName is a constant for a DNS resources used for the internal domain name.
DNSInternalName = "internal"
// DNSExternalName is a constant for a DNS resources used for the external domain name.
DNSExternalName = "external"
// DNSProviderRolePrimary is a constant for a DNS providers used to manage shoot domains.
DNSProviderRolePrimary = "primary-dns-provider"
// DNSProviderRoleAdditional is a constant for additionally managed DNS providers.
DNSProviderRoleAdditional = "managed-dns-provider"
)
// DeployInternalDomainDNSRecord deploys the DNS record for the internal cluster domain.
func (b *Botanist) DeployInternalDomainDNSRecord(ctx context.Context) error {
if err := b.deployDNSProvider(ctx, DNSInternalName, DNSProviderRolePrimary, b.Garden.InternalDomain.Provider, b.Garden.InternalDomain.SecretData, []string{b.Shoot.InternalClusterDomain}, nil, b.Garden.InternalDomain.IncludeZones, b.Garden.InternalDomain.ExcludeZones); err != nil {
return err
}
return b.deployDNSEntry(ctx, DNSInternalName, common.GetAPIServerDomain(b.Shoot.InternalClusterDomain), b.APIServerAddress)
}
// DestroyInternalDomainDNSRecord destroys the DNS record for the internal cluster domain.
func (b *Botanist) DestroyInternalDomainDNSRecord(ctx context.Context) error {
return b.deleteDNSEntry(ctx, DNSInternalName)
}
// DeployExternalDomainDNSRecord deploys the DNS record for the external cluster domain.
func (b *Botanist) DeployExternalDomainDNSRecord(ctx context.Context) error {
if b.Shoot.Info.Spec.DNS == nil || b.Shoot.Info.Spec.DNS.Domain == nil || b.Shoot.ExternalClusterDomain == nil || strings.HasSuffix(*b.Shoot.ExternalClusterDomain, ".nip.io") {
return nil
}
if err := b.deployDNSProvider(ctx, DNSExternalName, DNSProviderRolePrimary, b.Shoot.ExternalDomain.Provider, b.Shoot.ExternalDomain.SecretData, sets.NewString(append(b.Shoot.ExternalDomain.IncludeDomains, *b.Shoot.ExternalClusterDomain)...).List(), b.Shoot.ExternalDomain.ExcludeDomains, b.Shoot.ExternalDomain.IncludeZones, b.Shoot.ExternalDomain.ExcludeZones); err != nil {
return err
}
return b.deployDNSEntry(ctx, DNSExternalName, common.GetAPIServerDomain(*b.Shoot.ExternalClusterDomain), common.GetAPIServerDomain(b.Shoot.InternalClusterDomain))
}
// DestroyExternalDomainDNSRecord destroys the DNS record for the external cluster domain.
func (b *Botanist) DestroyExternalDomainDNSRecord(ctx context.Context) error {
return b.deleteDNSEntry(ctx, DNSExternalName)
}
// DeployAdditionalDNSProviders deploys the additional DNS providers configured in the shoot resource.
func (b *Botanist) DeployAdditionalDNSProviders(ctx context.Context) error {
if b.Shoot.Info.Spec.DNS == nil {
return nil
}
var (
fns []flow.TaskFn
deployedProviders = sets.NewString()
)
for i, provider := range b.Shoot.Info.Spec.DNS.Providers {
p := provider
if p.Primary != nil && *p.Primary {
continue
}
fns = append(fns, func(ctx context.Context) error {
var includeDomains, excludeDomains, includeZones, excludeZones []string
if domains := p.Domains; domains != nil {
includeDomains = domains.Include
excludeDomains = domains.Exclude
}
if zones := p.Zones; zones != nil {
includeZones = zones.Include
excludeZones = zones.Exclude
}
providerType := p.Type
if providerType == nil {
return fmt.Errorf("dns provider[%d] doesn't speify a type", i)
}
if *providerType == core.DNSUnmanaged {
b.Logger.Infof("Skipping deployment of DNS provider[%d] since it specifies type %q", i, core.DNSUnmanaged)
return nil
}
secretName := p.SecretName
if secretName == nil {
return fmt.Errorf("dns provider[%d] doesn't specify a secretName", i)
}
secret := &corev1.Secret{}
if err := b.K8sGardenClient.Client().Get(ctx, kutil.Key(b.Shoot.Info.Namespace, *secretName), secret); err != nil {
return fmt.Errorf("could not get dns provider secret %q: %+v", *secretName, err)
}
providerName := GenerateDNSProviderName(*secretName, *providerType)
if err := b.deployDNSProvider(ctx, providerName, DNSProviderRoleAdditional, *p.Type, secret.Data, includeDomains, excludeDomains, includeZones, excludeZones); err != nil {
return err
}
deployedProviders.Insert(providerName)
return nil
})
}
if err := flow.Parallel(fns...)(ctx); err != nil {
return err
}
// Clean-up old providers
providerList := &dnsv1alpha1.DNSProviderList{}
if err := b.K8sSeedClient.Client().List(ctx, providerList, client.InNamespace(b.Shoot.SeedNamespace), client.MatchingLabels{v1beta1constants.GardenRole: DNSProviderRoleAdditional}); err != nil {
return err
}
fns = nil
for _, provider := range providerList.Items {
p := provider
if !deployedProviders.Has(p.Name) {
fns = append(fns, func(ctx context.Context) error {
return b.deleteDNSProvider(ctx, p.Name)
})
}
}
if err := flow.Parallel(fns...)(ctx); err != nil {
return err
}
fns = nil
for _, provider := range deployedProviders.UnsortedList() {
providerName := provider
fns = append(fns, func(ctx context.Context) error {
return b.waitUntilDNSProviderReady(ctx, providerName)
})
}
return flow.Parallel(fns...)(ctx)
}
// DeleteDNSProviders deletes all DNS providers in the shoot namespace of the seed.
func (b *Botanist) DeleteDNSProviders(ctx context.Context) error {
if err := b.K8sSeedClient.Client().DeleteAllOf(ctx, &dnsv1alpha1.DNSProvider{}, client.InNamespace(b.Shoot.SeedNamespace)); err != nil {
return err
}
providers := &dnsv1alpha1.DNSProviderList{}
return kutil.WaitUntilResourcesDeleted(ctx, b.K8sSeedClient.Client(), providers, 5*time.Second, client.InNamespace(b.Shoot.SeedNamespace))
}
func (b *Botanist) deployDNSProvider(ctx context.Context, name, role, provider string, secretData map[string][]byte, includeDomains, excludeDomains, includeZones, excludeZones []string) error {
values := map[string]interface{}{
"name": name,
"purpose": name,
"provider": provider,
"providerLabels": map[string]interface{}{
v1beta1constants.GardenRole: role,
},
"secretData": secretData,
"domains": map[string]interface{}{
"include": includeDomains,
"exclude": excludeDomains,
},
"zones": map[string]interface{}{
"include": includeZones,
"exclude": excludeZones,
},
}
if err := b.ChartApplierSeed.ApplyChart(ctx, filepath.Join(dnsChartPath, "provider"), b.Shoot.SeedNamespace, name, nil, values); err != nil {
return err
}
return b.waitUntilDNSProviderReady(ctx, name)
}
func (b *Botanist) waitUntilDNSProviderReady(ctx context.Context, name string) error {
var (
status string
message string
)
if err := retry.UntilTimeout(ctx, 5*time.Second, 2*time.Minute, func(ctx context.Context) (done bool, err error) {
provider := &dnsv1alpha1.DNSProvider{}
if err := b.K8sSeedClient.Client().Get(ctx, client.ObjectKey{Name: name, Namespace: b.Shoot.SeedNamespace}, provider); err != nil {
return retry.SevereError(err)
}
if provider.Status.State == dnsv1alpha1.STATE_READY {
return retry.Ok()
}
status = provider.Status.State
if msg := provider.Status.Message; msg != nil {
message = *msg
}
b.Logger.Infof("Waiting for %q DNS provider to be ready... (status=%s, message=%s)", name, status, message)
return retry.MinorError(fmt.Errorf("DNS provider %q is not ready (status=%s, message=%s)", name, status, message))
}); err != nil {
return gardencorev1beta1helper.DetermineError(fmt.Sprintf("Failed to create DNS provider for %q DNS record: %q (status=%s, message=%s)", name, err.Error(), status, message))
}
return nil
}
func (b *Botanist) deleteDNSProvider(ctx context.Context, name string) error {
if err := b.K8sSeedClient.Client().Delete(ctx, &dnsv1alpha1.DNSProvider{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: name}}); err != nil && !apierrors.IsNotFound(err) {
return err
}
ctx, cancel := context.WithTimeout(ctx, 2*time.Minute)
defer cancel()
return kutil.WaitUntilResourceDeleted(ctx, b.K8sSeedClient.Client(), &dnsv1alpha1.DNSProvider{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: name}}, 5*time.Second)
}
func (b *Botanist) deployDNSEntry(ctx context.Context, name, dnsName, target string) error {
values := map[string]interface{}{
"name": name,
"dnsName": dnsName,
"targets": []string{target},
}
if err := b.ChartApplierSeed.ApplyChart(ctx, filepath.Join(dnsChartPath, "entry"), b.Shoot.SeedNamespace, name, nil, values); err != nil {
return err
}
return b.waitUntilDNSEntryReady(ctx, name)
}
func (b *Botanist) waitUntilDNSEntryReady(ctx context.Context, name string) error {
var (
status string
message string
)
if err := retry.UntilTimeout(ctx, 5*time.Second, 2*time.Minute, func(ctx context.Context) (done bool, err error) {
entry := &dnsv1alpha1.DNSEntry{}
if err := b.K8sSeedClient.Client().Get(ctx, client.ObjectKey{Name: name, Namespace: b.Shoot.SeedNamespace}, entry); err != nil {
return retry.SevereError(err)
}
if entry.Status.ObservedGeneration == entry.Generation && entry.Status.State == dnsv1alpha1.STATE_READY {
return retry.Ok()
}
status = entry.Status.State
if msg := entry.Status.Message; msg != nil {
message = *msg
}
b.Logger.Infof("Waiting for %q DNS record to be ready... (status=%s, message=%s)", name, status, message)
return retry.MinorError(fmt.Errorf("DNS record %q is not ready (status=%s, message=%s)", name, status, message))
}); err != nil {
return gardencorev1beta1helper.DetermineError(fmt.Sprintf("Failed to create %q DNS record: %q (status=%s, message=%s)", name, err.Error(), status, message))
}
return nil
}
func (b *Botanist) deleteDNSEntry(ctx context.Context, name string) error {
if err := b.K8sSeedClient.Client().Delete(ctx, &dnsv1alpha1.DNSEntry{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: name}}); err != nil && !apierrors.IsNotFound(err) {
return err
}
ctx, cancel := context.WithTimeout(ctx, 2*time.Minute)
defer cancel()
return kutil.WaitUntilResourceDeleted(ctx, b.K8sSeedClient.Client(), &dnsv1alpha1.DNSEntry{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: name}}, 5*time.Second)
}
// GenerateDNSProviderName creates a name for the dns provider out of the passed `secretName` and `providerType`.
func GenerateDNSProviderName(secretName, providerType string) string {
switch {
case secretName != "" && providerType != "":
return fmt.Sprintf("%s-%s", providerType, secretName)
case secretName != "":
return secretName
case providerType != "":
return providerType
default:
return ""
}
}