/
logging.go
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/
logging.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"
"github.com/gardener/gardener/charts"
gardencore "github.com/gardener/gardener/pkg/apis/core"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/features"
gardenlethelper "github.com/gardener/gardener/pkg/gardenlet/apis/config/helper"
gardenletfeatures "github.com/gardener/gardener/pkg/gardenlet/features"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/operation/seed"
"github.com/gardener/gardener/pkg/utils/images"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/secrets"
secretsmanager "github.com/gardener/gardener/pkg/utils/secrets/manager"
corev1 "k8s.io/api/core/v1"
extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
networkingv1 "k8s.io/api/networking/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// DeploySeedLogging will install the Helm release "seed-bootstrap/charts/loki" in the Seed clusters.
func (b *Botanist) DeploySeedLogging(ctx context.Context) error {
// check if loki is enabled in gardenlet config, default is true
var lokiEnabled = gardenlethelper.IsLokiEnabled(b.Config)
if !b.Shoot.IsShootControlPlaneLoggingEnabled(b.Config) || !lokiEnabled {
return b.destroyShootLoggingStack(ctx)
}
if err := b.Shoot.Components.Logging.ShootRBACProxy.Deploy(ctx); err != nil {
return err
}
seedImages, err := b.InjectSeedSeedImages(map[string]interface{}{},
images.ImageNameLoki,
images.ImageNameLokiCurator,
images.ImageNameKubeRbacProxy,
images.ImageNameTelegraf,
)
if err != nil {
return err
}
lokiValues := map[string]interface{}{
"global": seedImages,
"replicas": b.Shoot.GetReplicas(1),
}
hvpaValues := make(map[string]interface{})
hvpaEnabled := gardenletfeatures.FeatureGate.Enabled(features.HVPA)
if b.ManagedSeed != nil {
hvpaEnabled = gardenletfeatures.FeatureGate.Enabled(features.HVPAForShootedSeed)
}
ingressClass, err := seed.ComputeNginxIngressClass(b.Seed, b.Seed.GetInfo().Status.KubernetesVersion)
if err != nil {
return err
}
genericTokenKubeconfigSecret, found := b.SecretsManager.Get(v1beta1constants.SecretNameGenericTokenKubeconfig)
if !found {
return fmt.Errorf("secret %q not found", v1beta1constants.SecretNameGenericTokenKubeconfig)
}
if b.isShootNodeLoggingEnabled() {
ingressTLSSecret, err := b.SecretsManager.Generate(ctx, &secrets.CertificateSecretConfig{
Name: "loki-tls",
CommonName: b.ComputeLokiHost(),
Organization: []string{"gardener.cloud:monitoring:ingress"},
DNSNames: b.ComputeLokiHosts(),
CertType: secrets.ServerCert,
Validity: &ingressTLSCertificateValidity,
SkipPublishingCACertificate: true,
}, secretsmanager.SignedByCA(v1beta1constants.SecretNameCACluster))
if err != nil {
return err
}
lokiValues["rbacSidecarEnabled"] = true
lokiValues["ingress"] = map[string]interface{}{
"class": ingressClass,
"hosts": []map[string]interface{}{
{
"hostName": b.ComputeLokiHost(),
"secretName": ingressTLSSecret.Name,
"serviceName": "loki",
"servicePort": 8080,
"backendPath": "/loki/api/v1/push",
},
},
}
lokiValues["genericTokenKubeconfigSecretName"] = genericTokenKubeconfigSecret.Name
} else {
if err := b.destroyShootNodeLogging(ctx); err != nil {
return err
}
}
hvpaValues["enabled"] = hvpaEnabled
lokiValues["hvpa"] = hvpaValues
if hvpaEnabled {
currentResources, err := kutil.GetContainerResourcesInStatefulSet(ctx, b.K8sSeedClient.Client(), kutil.Key(b.Shoot.SeedNamespace, "loki"))
if err != nil {
return err
}
if len(currentResources) != 0 && currentResources["loki"] != nil {
lokiValues["resources"] = map[string]interface{}{
// Copy requests only, effectively removing limits
"loki": &corev1.ResourceRequirements{Requests: currentResources["loki"].Requests},
}
}
}
if err := b.K8sSeedClient.ChartApplier().Apply(ctx, filepath.Join(charts.Path, "seed-bootstrap", "charts", "loki"), b.Shoot.SeedNamespace, fmt.Sprintf("%s-logging", b.Shoot.SeedNamespace), kubernetes.Values(lokiValues)); err != nil {
return err
}
// TODO(rfranzke): Remove in a future release.
return kutil.DeleteObjects(ctx, b.K8sSeedClient.Client(),
&corev1.Secret{ObjectMeta: metav1.ObjectMeta{Namespace: b.Shoot.SeedNamespace, Name: "loki-tls"}},
)
}
func (b *Botanist) destroyShootLoggingStack(ctx context.Context) error {
if err := b.destroyShootNodeLogging(ctx); err != nil {
return err
}
return common.DeleteLoki(ctx, b.K8sSeedClient.Client(), b.Shoot.SeedNamespace)
}
func (b *Botanist) destroyShootNodeLogging(ctx context.Context) error {
if err := b.Shoot.Components.Logging.ShootRBACProxy.Destroy(ctx); err != nil {
return err
}
return kutil.DeleteObjects(ctx, b.K8sSeedClient.Client(),
&extensionsv1beta1.Ingress{ObjectMeta: metav1.ObjectMeta{Name: "loki", Namespace: b.Shoot.SeedNamespace}},
&networkingv1.Ingress{ObjectMeta: metav1.ObjectMeta{Name: "loki", Namespace: b.Shoot.SeedNamespace}},
&networkingv1.NetworkPolicy{ObjectMeta: metav1.ObjectMeta{Name: "allow-from-prometheus-to-loki-telegraf", Namespace: b.Shoot.SeedNamespace}},
&corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: "telegraf-config", Namespace: b.Shoot.SeedNamespace}},
)
}
func (b *Botanist) isShootNodeLoggingEnabled() bool {
if b.Shoot != nil && b.Shoot.IsShootControlPlaneLoggingEnabled(b.Config) &&
gardenlethelper.IsLokiEnabled(b.Config) && b.Config != nil &&
b.Config.Logging != nil && b.Config.Logging.ShootNodeLogging != nil {
for _, purpose := range b.Config.Logging.ShootNodeLogging.ShootPurposes {
if gardencore.ShootPurpose(b.Shoot.Purpose) == purpose {
return true
}
}
}
return false
}