/
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"
"strings"
"time"
"github.com/gardener/gardener/pkg/apis/core"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/features"
gardenletfeatures "github.com/gardener/gardener/pkg/gardenlet/features"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/operation/botanist/extensions/dns"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
dnsv1alpha1 "github.com/gardener/external-dns-management/pkg/apis/dns/v1alpha1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
)
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"
// DNSProviderRoleAdditional is a constant for additionally managed DNS providers.
DNSProviderRoleAdditional = "managed-dns-provider"
)
// 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 ""
}
}
// DeployExternalDNS deploys the external DNSProvider and DNSEntry.
func (b *Botanist) DeployExternalDNS(ctx context.Context) error {
return b.ExternalDNS().Deploy(ctx)
}
// ExternalDNS returns the external DNSProvider which deploys / destroys
// the external DNSProvider and DNSEntry.
func (b *Botanist) ExternalDNS() component.Deployer {
if b.NeedsExternalDNS() {
return component.OpWaiter(
b.Shoot.Components.DNS.ExternalProvider,
b.Shoot.Components.DNS.ExternalEntry,
)
}
return component.OpWaiter(
b.Shoot.Components.DNS.ExternalEntry,
b.Shoot.Components.DNS.ExternalProvider,
)
}
// DeployInternalDNS deploys the internal DNSProvider and DNSEntry.
func (b *Botanist) DeployInternalDNS(ctx context.Context) error {
return b.InternalDNS().Deploy(ctx)
}
// InternalDNS returns the internal DNSProvider which deploys / destroys
// the internal DNSProvider and DNSEntry.
func (b *Botanist) InternalDNS() component.Deployer {
if b.NeedsInternalDNS() {
return component.OpWaiter(
b.Shoot.Components.DNS.InternalProvider,
b.Shoot.Components.DNS.InternalEntry,
)
}
return component.OpWaiter(
b.Shoot.Components.DNS.InternalEntry,
b.Shoot.Components.DNS.InternalProvider,
)
}
// DefaultExternalDNSProvider returns the external DNSProvider if external DNS is
// enabled and if not DeployWaiter which removes the external DNSProvider.
func (b *Botanist) DefaultExternalDNSProvider(seedClient client.Client) component.DeployWaiter {
if b.NeedsExternalDNS() {
return dns.NewDNSProvider(
&dns.ProviderValues{
Name: DNSExternalName,
Purpose: DNSExternalName,
Provider: b.Shoot.ExternalDomain.Provider,
SecretData: b.Shoot.ExternalDomain.SecretData,
Domains: &dns.IncludeExclude{
Include: sets.NewString(append(b.Shoot.ExternalDomain.IncludeDomains, *b.Shoot.ExternalClusterDomain)...).List(),
Exclude: b.Shoot.ExternalDomain.ExcludeDomains,
},
Zones: &dns.IncludeExclude{
Include: b.Shoot.ExternalDomain.IncludeZones,
Exclude: b.Shoot.ExternalDomain.ExcludeZones,
},
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
)
}
return component.OpDestroy(dns.NewDNSProvider(
&dns.ProviderValues{
Name: DNSExternalName,
Purpose: DNSExternalName,
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
))
}
// DefaultExternalDNSEntry returns DeployWaiter which removes the external DNSEntry.
func (b *Botanist) DefaultExternalDNSEntry(seedClient client.Client) component.DeployWaiter {
return component.OpDestroy(dns.NewDNSEntry(
&dns.EntryValues{
Name: DNSExternalName,
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
))
}
// DefaultInternalDNSProvider returns the internal DNSProvider if internal DNS is
// enabled and if not, DeployWaiter which removes the internal DNSProvider.
func (b *Botanist) DefaultInternalDNSProvider(seedClient client.Client) component.DeployWaiter {
if b.NeedsInternalDNS() {
return dns.NewDNSProvider(
&dns.ProviderValues{
Name: DNSInternalName,
Purpose: DNSInternalName,
Provider: b.Garden.InternalDomain.Provider,
SecretData: b.Garden.InternalDomain.SecretData,
Domains: &dns.IncludeExclude{
Include: []string{b.Shoot.InternalClusterDomain},
},
Zones: &dns.IncludeExclude{
Include: b.Garden.InternalDomain.IncludeZones,
Exclude: b.Garden.InternalDomain.ExcludeZones,
},
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
)
}
return component.OpDestroy(dns.NewDNSProvider(
&dns.ProviderValues{
Name: DNSInternalName,
Purpose: DNSInternalName,
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
))
}
// DefaultInternalDNSEntry returns DeployWaiter which removes the internal DNSEntry.
func (b *Botanist) DefaultInternalDNSEntry(seedClient client.Client) component.DeployWaiter {
return component.OpDestroy(dns.NewDNSEntry(
&dns.EntryValues{
Name: DNSInternalName,
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
))
}
// AdditionalDNSProviders returns a map containing DNSProviders where the key is the provider name.
// Providers and DNSEntries which are no longer needed / or in use, contain a DeployWaiter which removes
// said DNSEntry / DNSProvider.
func (b *Botanist) AdditionalDNSProviders(ctx context.Context, gardenClient, seedClient client.Client) (map[string]component.DeployWaiter, error) {
additionalProviders := map[string]component.DeployWaiter{}
if b.NeedsAdditionalDNSProviders() {
for i, provider := range b.Shoot.Info.Spec.DNS.Providers {
p := provider
if p.Primary != nil && *p.Primary {
continue
}
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 nil, fmt.Errorf("dns provider[%d] doesn't specify a type", i)
}
if *providerType == core.DNSUnmanaged {
b.Logger.Infof("Skipping deployment of DNS provider[%d] since it specifies type %q", i, core.DNSUnmanaged)
continue
}
secretName := p.SecretName
if secretName == nil {
return nil, fmt.Errorf("dns provider[%d] doesn't specify a secretName", i)
}
secret := &corev1.Secret{}
if err := gardenClient.Get(
ctx,
kutil.Key(b.Shoot.Info.Namespace, *secretName),
secret,
); err != nil {
return nil, fmt.Errorf("could not get dns provider secret %q: %+v", *secretName, err)
}
providerName := GenerateDNSProviderName(*secretName, *providerType)
additionalProviders[providerName] = dns.NewDNSProvider(
&dns.ProviderValues{
Name: providerName,
Purpose: providerName,
Labels: map[string]string{v1beta1constants.GardenRole: DNSProviderRoleAdditional},
SecretData: secret.Data,
Provider: *p.Type,
Domains: &dns.IncludeExclude{
Include: includeDomains,
Exclude: excludeDomains,
},
Zones: &dns.IncludeExclude{
Include: includeZones,
Exclude: excludeZones,
},
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
)
}
}
// Clean-up old providers
providerList := &dnsv1alpha1.DNSProviderList{}
if err := seedClient.List(
ctx,
providerList,
client.InNamespace(b.Shoot.SeedNamespace),
client.MatchingLabels{v1beta1constants.GardenRole: DNSProviderRoleAdditional},
); err != nil {
return nil, err
}
for _, p := range providerList.Items {
if _, ok := additionalProviders[p.Name]; !ok {
additionalProviders[p.Name] = component.OpDestroy(dns.NewDNSProvider(
&dns.ProviderValues{
Name: p.Name,
Purpose: p.Name,
Labels: map[string]string{v1beta1constants.GardenRole: DNSProviderRoleAdditional},
},
b.Shoot.SeedNamespace,
b.K8sSeedClient.ChartApplier(),
b.ChartsRootPath,
b.Logger,
seedClient,
nil,
))
}
}
return additionalProviders, nil
}
// NeedsExternalDNS returns true if the Shoot cluster needs external DNS.
func (b *Botanist) NeedsExternalDNS() bool {
return !b.Shoot.DisableDNS &&
b.Shoot.Info.Spec.DNS != nil &&
b.Shoot.Info.Spec.DNS.Domain != nil &&
b.Shoot.ExternalClusterDomain != nil &&
!strings.HasSuffix(*b.Shoot.ExternalClusterDomain, ".nip.io") &&
b.Shoot.ExternalDomain != nil &&
b.Shoot.ExternalDomain.Provider != "unmanaged"
}
// NeedsInternalDNS returns true if the Shoot cluster needs internal DNS.
func (b *Botanist) NeedsInternalDNS() bool {
return !b.Shoot.DisableDNS &&
b.Garden.InternalDomain != nil &&
b.Garden.InternalDomain.Provider != "unmanaged"
}
// NeedsAdditionalDNSProviders returns true if additional DNS providers
// are needed.
func (b *Botanist) NeedsAdditionalDNSProviders() bool {
return !b.Shoot.DisableDNS &&
b.Shoot.Info.Spec.DNS != nil &&
len(b.Shoot.Info.Spec.DNS.Providers) > 0
}
// APIServerSNIEnabled returns true if APIServerSNI feature gate is enabled and
// the shoot uses internal and external DNS.
func (b *Botanist) APIServerSNIEnabled() bool {
return gardenletfeatures.FeatureGate.Enabled(features.APIServerSNI) && b.NeedsInternalDNS() && b.NeedsExternalDNS()
}
// 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
}
return kutil.WaitUntilResourcesDeleted(
ctx,
b.K8sSeedClient.Client(),
&dnsv1alpha1.DNSProviderList{},
5*time.Second,
client.InNamespace(b.Shoot.SeedNamespace),
)
}