/
dependency_watchdog.go
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/
dependency_watchdog.go
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// Copyright (c) 2021 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 kubeapiserver
import (
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/operation/botanist/component/dependencywatchdog"
restarterapi "github.com/gardener/dependency-watchdog/pkg/restarter/api"
scalerapi "github.com/gardener/dependency-watchdog/pkg/scaler/api"
appsv1 "k8s.io/api/apps/v1"
autoscalingv1 "k8s.io/api/autoscaling/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/pointer"
)
// DependencyWatchdogEndpointConfiguration returns the configuration for the dependency watchdog (endpoint role)
// ensuring that its dependant pods are restarted as soon as it recovers from a crash loop.
func DependencyWatchdogEndpointConfiguration() (map[string]restarterapi.Service, error) {
return map[string]restarterapi.Service{
v1beta1constants.DeploymentNameKubeAPIServer: {
Dependants: []restarterapi.DependantPods{
{
Name: v1beta1constants.GardenRoleControlPlane,
Selector: &metav1.LabelSelector{
MatchExpressions: []metav1.LabelSelectorRequirement{
{
Key: v1beta1constants.GardenRole,
Operator: metav1.LabelSelectorOpIn,
Values: []string{v1beta1constants.GardenRoleControlPlane},
},
{
Key: v1beta1constants.LabelRole,
Operator: metav1.LabelSelectorOpNotIn,
Values: []string{v1beta1constants.ETCDRoleMain, v1beta1constants.LabelAPIServer},
},
},
},
},
},
},
}, nil
}
// DependencyWatchdogProbeConfiguration returns the configuration for the dependency watchdog (probe role)
// ensuring that its dependant pods are scaled as soon a probe fails.
func DependencyWatchdogProbeConfiguration() ([]scalerapi.ProbeDependants, error) {
return []scalerapi.ProbeDependants{{
Name: "shoot-" + v1beta1constants.DeploymentNameKubeAPIServer,
Probe: &scalerapi.ProbeConfig{
External: &scalerapi.ProbeDetails{KubeconfigSecretName: dependencywatchdog.ExternalProbeSecretName},
Internal: &scalerapi.ProbeDetails{KubeconfigSecretName: dependencywatchdog.InternalProbeSecretName},
PeriodSeconds: pointer.Int32(30),
},
DependantScales: []*scalerapi.DependantScaleDetails{
{
ScaleRef: autoscalingv1.CrossVersionObjectReference{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: v1beta1constants.DeploymentNameKubeControllerManager,
},
ScaleUpDelaySeconds: pointer.Int32(120),
},
{
ScaleRef: autoscalingv1.CrossVersionObjectReference{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: v1beta1constants.DeploymentNameMachineControllerManager,
},
ScaleUpDelaySeconds: pointer.Int32(60),
ScaleRefDependsOn: []autoscalingv1.CrossVersionObjectReference{
{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: v1beta1constants.DeploymentNameKubeControllerManager,
},
},
},
{
ScaleRef: autoscalingv1.CrossVersionObjectReference{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: v1beta1constants.DeploymentNameClusterAutoscaler,
},
ScaleRefDependsOn: []autoscalingv1.CrossVersionObjectReference{
{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: v1beta1constants.DeploymentNameMachineControllerManager,
},
},
},
},
}}, nil
}