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bootstrap.go
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// Copyright (c) 2020 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 etcd
import (
"context"
"fmt"
"time"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/operation/botanist/component"
"github.com/gardener/gardener/pkg/utils"
gutil "github.com/gardener/gardener/pkg/utils/gardener"
"github.com/gardener/gardener/pkg/utils/imagevector"
"github.com/gardener/gardener/pkg/utils/managedresources"
"github.com/Masterminds/semver"
druidv1alpha1 "github.com/gardener/etcd-druid/api/v1alpha1"
appsv1 "k8s.io/api/apps/v1"
autoscalingv1 "k8s.io/api/autoscaling/v1"
coordinationv1 "k8s.io/api/coordination/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
apiextensionsv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
autoscalingv1beta2 "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/apis/autoscaling.k8s.io/v1beta2"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
// Druid is a constant for the name of the etcd-druid.
Druid = "etcd-druid"
druidRBACName = "gardener.cloud:system:" + Druid
druidServiceAccountName = Druid
druidVPAName = Druid + "-vpa"
druidConfigMapImageVectorOverwriteName = Druid + "-imagevector-overwrite"
druidDeploymentName = Druid
managedResourceControlName = Druid
druidConfigMapImageVectorOverwriteDataKey = "images_overwrite.yaml"
druidDeploymentVolumeMountPathImageVectorOverwrite = "/charts_overwrite"
druidDeploymentVolumeNameImageVectorOverwrite = "imagevector-overwrite"
)
// NewBootstrapper creates a new instance of DeployWaiter for the etcd bootstrapper.
func NewBootstrapper(
client client.Client,
namespace string,
image string,
kubernetesVersion *semver.Version,
imageVectorOverwrite *string,
) component.DeployWaiter {
return &bootstrapper{
client: client,
namespace: namespace,
image: image,
kubernetesVersion: kubernetesVersion,
imageVectorOverwrite: imageVectorOverwrite,
}
}
type bootstrapper struct {
client client.Client
namespace string
image string
kubernetesVersion *semver.Version
imageVectorOverwrite *string
}
func (b *bootstrapper) Deploy(ctx context.Context) error {
var (
registry = managedresources.NewRegistry(kubernetes.SeedScheme, kubernetes.SeedCodec, kubernetes.SeedSerializer)
labels = func() map[string]string { return map[string]string{v1beta1constants.GardenRole: Druid} }
serviceAccount = &corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: druidServiceAccountName,
Namespace: b.namespace,
Labels: labels(),
},
}
clusterRole = &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: druidRBACName,
Labels: labels(),
},
Rules: []rbacv1.PolicyRule{
{
APIGroups: []string{corev1.GroupName},
Resources: []string{"pods"},
Verbs: []string{"list", "watch", "delete"},
},
{
APIGroups: []string{corev1.GroupName},
Resources: []string{"secrets", "endpoints"},
Verbs: []string{"get", "list", "patch", "update", "watch"},
},
{
APIGroups: []string{corev1.GroupName},
Resources: []string{"events"},
Verbs: []string{"create", "get", "list", "watch", "patch", "update"},
},
{
APIGroups: []string{corev1.GroupName, appsv1.GroupName},
Resources: []string{"services", "configmaps", "statefulsets"},
Verbs: []string{"get", "list", "patch", "update", "watch", "create", "delete"},
},
{
APIGroups: []string{druidv1alpha1.GroupVersion.Group},
Resources: []string{"etcds"},
Verbs: []string{"get", "list", "watch", "update", "patch"},
},
{
APIGroups: []string{druidv1alpha1.GroupVersion.Group},
Resources: []string{"etcds/status", "etcds/finalizers"},
Verbs: []string{"get", "update", "patch", "create"},
},
{
APIGroups: []string{coordinationv1.GroupName},
Resources: []string{"leases"},
Verbs: []string{"create"},
},
{
APIGroups: []string{coordinationv1.GroupName},
Resources: []string{"leases"},
ResourceNames: []string{"druid-leader-election"},
Verbs: []string{"get", "update", "patch"},
},
{
APIGroups: []string{corev1.GroupName},
Resources: []string{"persistentvolumeclaims"},
Verbs: []string{"get", "list", "watch"},
},
},
}
clusterRoleBinding = &rbacv1.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: druidRBACName,
Labels: labels(),
},
RoleRef: rbacv1.RoleRef{
APIGroup: rbacv1.GroupName,
Kind: "ClusterRole",
Name: druidRBACName,
},
Subjects: []rbacv1.Subject{
{
Kind: rbacv1.ServiceAccountKind,
Name: druidServiceAccountName,
Namespace: b.namespace,
},
},
}
configMapImageVectorOverwrite = &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: druidConfigMapImageVectorOverwriteName,
Namespace: b.namespace,
Labels: labels(),
},
}
vpaUpdateMode = autoscalingv1beta2.UpdateModeAuto
vpa = &autoscalingv1beta2.VerticalPodAutoscaler{
ObjectMeta: metav1.ObjectMeta{
Name: druidVPAName,
Namespace: b.namespace,
Labels: labels(),
},
Spec: autoscalingv1beta2.VerticalPodAutoscalerSpec{
TargetRef: &autoscalingv1.CrossVersionObjectReference{
APIVersion: appsv1.SchemeGroupVersion.String(),
Kind: "Deployment",
Name: druidDeploymentName,
},
UpdatePolicy: &autoscalingv1beta2.PodUpdatePolicy{
UpdateMode: &vpaUpdateMode,
},
ResourcePolicy: &autoscalingv1beta2.PodResourcePolicy{
ContainerPolicies: []autoscalingv1beta2.ContainerResourcePolicy{{
ContainerName: autoscalingv1beta2.DefaultContainerResourcePolicy,
MinAllowed: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("50m"),
corev1.ResourceMemory: resource.MustParse("100M"),
},
}},
},
},
}
deployment = &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: druidDeploymentName,
Namespace: b.namespace,
Labels: labels(),
},
Spec: appsv1.DeploymentSpec{
Replicas: pointer.Int32(1),
RevisionHistoryLimit: pointer.Int32(1),
Selector: &metav1.LabelSelector{
MatchLabels: labels(),
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: labels(),
},
Spec: corev1.PodSpec{
ServiceAccountName: druidServiceAccountName,
Containers: []corev1.Container{
{
Name: Druid,
Image: b.image,
ImagePullPolicy: corev1.PullIfNotPresent,
Command: []string{
"/bin/etcd-druid",
"--enable-leader-election=true",
"--ignore-operation-annotation=false",
"--workers=50",
},
Resources: corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("50m"),
corev1.ResourceMemory: resource.MustParse("128Mi"),
},
Limits: corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("300m"),
corev1.ResourceMemory: resource.MustParse("512Mi"),
},
},
Ports: []corev1.ContainerPort{{
ContainerPort: 9569,
}},
},
},
},
},
},
}
resourcesToAdd = []client.Object{
serviceAccount,
clusterRole,
clusterRoleBinding,
vpa,
}
)
if b.imageVectorOverwrite != nil {
configMapImageVectorOverwrite.Data = map[string]string{druidConfigMapImageVectorOverwriteDataKey: *b.imageVectorOverwrite}
resourcesToAdd = append(resourcesToAdd, configMapImageVectorOverwrite)
metav1.SetMetaDataAnnotation(&deployment.Spec.Template.ObjectMeta, "checksum/configmap-imagevector-overwrite", utils.ComputeChecksum(configMapImageVectorOverwrite.Data))
deployment.Spec.Template.Spec.Volumes = append(deployment.Spec.Template.Spec.Volumes, corev1.Volume{
Name: druidDeploymentVolumeNameImageVectorOverwrite,
VolumeSource: corev1.VolumeSource{
ConfigMap: &corev1.ConfigMapVolumeSource{
LocalObjectReference: corev1.LocalObjectReference{
Name: druidConfigMapImageVectorOverwriteName,
},
},
},
})
deployment.Spec.Template.Spec.Containers[0].VolumeMounts = append(deployment.Spec.Template.Spec.Containers[0].VolumeMounts, corev1.VolumeMount{
Name: druidDeploymentVolumeNameImageVectorOverwrite,
MountPath: druidDeploymentVolumeMountPathImageVectorOverwrite,
ReadOnly: true,
})
deployment.Spec.Template.Spec.Containers[0].Env = append(deployment.Spec.Template.Spec.Containers[0].Env, corev1.EnvVar{
Name: imagevector.OverrideEnv,
Value: druidDeploymentVolumeMountPathImageVectorOverwrite + "/" + druidConfigMapImageVectorOverwriteDataKey,
})
}
resources, err := registry.AddAllAndSerialize(append(resourcesToAdd, deployment)...)
if err != nil {
return err
}
resources["crd.yaml"] = []byte(crdYAML)
return managedresources.CreateForSeed(ctx, b.client, b.namespace, managedResourceControlName, false, resources)
}
func (b *bootstrapper) Destroy(ctx context.Context) error {
etcdList := &druidv1alpha1.EtcdList{}
// Need to check for both error types. The DynamicRestMapper can hold a stale cache returning a path to a non-existing api-resource leading to a NotFound error.
if err := b.client.List(ctx, etcdList); err != nil && !meta.IsNoMatchError(err) && !apierrors.IsNotFound(err) {
return err
}
if len(etcdList.Items) > 0 {
return fmt.Errorf("cannot debootstrap etcd-druid because there are still druidv1alpha1.Etcd resources left in the cluster")
}
if err := gutil.ConfirmDeletion(ctx, b.client, &apiextensionsv1beta1.CustomResourceDefinition{ObjectMeta: metav1.ObjectMeta{Name: crdName}}); client.IgnoreNotFound(err) != nil {
return err
}
return managedresources.DeleteForSeed(ctx, b.client, b.namespace, managedResourceControlName)
}
// TimeoutWaitForManagedResource is the timeout used while waiting for the ManagedResources to become healthy
// or deleted.
var TimeoutWaitForManagedResource = 2 * time.Minute
func (b *bootstrapper) Wait(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilHealthy(timeoutCtx, b.client, b.namespace, managedResourceControlName)
}
func (b *bootstrapper) WaitCleanup(ctx context.Context) error {
timeoutCtx, cancel := context.WithTimeout(ctx, TimeoutWaitForManagedResource)
defer cancel()
return managedresources.WaitUntilDeleted(timeoutCtx, b.client, b.namespace, managedResourceControlName)
}
const (
crdName = "etcds.druid.gardener.cloud"
crdYAML = `apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: ` + crdName + `
annotations:
controller-gen.kubebuilder.io/version: v0.2.4
labels:
` + gutil.DeletionProtected + `: "true"
spec:
group: druid.gardener.cloud
names:
kind: Etcd
listKind: EtcdList
plural: etcds
singular: etcd
scope: Namespaced
subresources:
scale:
labelSelectorPath: .status.labelSelector
specReplicasPath: .spec.replicas
statusReplicasPath: .status.replicas
status: {}
preserveUnknownFields: false
validation:
openAPIV3Schema:
description: Etcd is the Schema for the etcds API
properties:
apiVersion:
description: 'APIVersion defines the versioned schema of this representation
of an object. Servers should convert recognized schemas to the latest
internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
type: string
kind:
description: 'Kind is a string value representing the REST resource this
object represents. Servers may infer this from the endpoint the client
submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
type: string
metadata:
type: object
spec:
description: EtcdSpec defines the desired state of Etcd
properties:
annotations:
additionalProperties:
type: string
type: object
backup:
description: BackupSpec defines parametes associated with the full and
delta snapshots of etcd
properties:
compression:
description: SnapshotCompression defines the specification for compression of Snapshots.
properties:
enabled:
type: boolean
policy:
type: string
type: object
deltaSnapshotMemoryLimit:
description: DeltaSnapshotMemoryLimit defines the memory limit after
which delta snapshots will be taken
type: string
deltaSnapshotPeriod:
description: DeltaSnapshotPeriod defines the period after which
delta snapshots will be taken
type: string
fullSnapshotSchedule:
description: FullSnapshotSchedule defines the cron standard schedule
for full snapshots.
type: string
garbageCollectionPeriod:
description: GarbageCollectionPeriod defines the period for garbage
collecting old backups
type: string
garbageCollectionPolicy:
description: GarbageCollectionPolicy defines the policy for garbage
collecting old backups
enum:
- Exponential
- LimitBased
type: string
image:
description: Image defines the etcd container image and tag
type: string
port:
description: Port define the port on which etcd-backup-restore server
will exposed.
type: integer
resources:
description: 'Resources defines the compute Resources required by
backup-restore container. More info: https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/'
properties:
limits:
additionalProperties:
type: string
description: 'Limits describes the maximum amount of compute
resources allowed. More info: https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/'
type: object
requests:
additionalProperties:
type: string
description: 'Requests describes the minimum amount of compute
resources required. If Requests is omitted for a container,
it defaults to Limits if that is explicitly specified, otherwise
to an implementation-defined value. More info: https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/'
type: object
type: object
store:
description: Store defines the specification of object store provider
for storing backups.
properties:
container:
type: string
prefix:
type: string
provider:
description: StorageProvider defines the type of object store
provider for storing backups.
type: string
secretRef:
description: SecretReference represents a Secret Reference.
It has enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the
secret name must be unique.
type: string
type: object
required:
- prefix
type: object
tls:
description: TLSConfig hold the TLS configuration details.
properties:
clientTLSSecretRef:
description: SecretReference represents a Secret Reference.
It has enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the
secret name must be unique.
type: string
type: object
serverTLSSecretRef:
description: SecretReference represents a Secret Reference.
It has enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the
secret name must be unique.
type: string
type: object
tlsCASecretRef:
description: SecretReference represents a Secret Reference.
It has enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the
secret name must be unique.
type: string
type: object
required:
- clientTLSSecretRef
- serverTLSSecretRef
- tlsCASecretRef
type: object
type: object
etcd:
description: EtcdConfig defines parametes associated etcd deployed
properties:
authSecretRef:
description: SecretReference represents a Secret Reference. It has
enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the secret
name must be unique.
type: string
type: object
clientPort:
type: integer
defragmentationSchedule:
description: DefragmentationSchedule defines the cron standard schedule
for defragmentation of etcd.
type: string
image:
description: Image defines the etcd container image and tag
type: string
metrics:
description: Metrics defines the level of detail for exported metrics
of etcd, specify 'extensive' to include histogram metrics.
enum:
- basic
- extensive
type: string
quota:
description: Quota defines the etcd DB quota.
type: string
resources:
description: 'Resources defines the compute Resources required by
etcd container. More info: https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/'
properties:
limits:
additionalProperties:
type: string
description: 'Limits describes the maximum amount of compute
resources allowed. More info: https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/'
type: object
requests:
additionalProperties:
type: string
description: 'Requests describes the minimum amount of compute
resources required. If Requests is omitted for a container,
it defaults to Limits if that is explicitly specified, otherwise
to an implementation-defined value. More info: https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/'
type: object
type: object
serverPort:
type: integer
tls:
description: TLSConfig hold the TLS configuration details.
properties:
clientTLSSecretRef:
description: SecretReference represents a Secret Reference.
It has enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the
secret name must be unique.
type: string
type: object
serverTLSSecretRef:
description: SecretReference represents a Secret Reference.
It has enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the
secret name must be unique.
type: string
type: object
tlsCASecretRef:
description: SecretReference represents a Secret Reference.
It has enough information to retrieve secret in any namespace
properties:
name:
description: Name is unique within a namespace to reference
a secret resource.
type: string
namespace:
description: Namespace defines the space within which the
secret name must be unique.
type: string
type: object
required:
- clientTLSSecretRef
- serverTLSSecretRef
- tlsCASecretRef
type: object
type: object
labels:
additionalProperties:
type: string
type: object
priorityClassName:
description: PriorityClassName is the name of a priority class that
shall be used for the etcd pods.
type: string
replicas:
type: integer
selector:
description: 'selector is a label query over pods that should match
the replica count. It must match the pod template''s labels. More
info: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors'
properties:
matchExpressions:
description: matchExpressions is a list of label selector requirements.
The requirements are ANDed.
items:
description: A label selector requirement is a selector that contains
values, a key, and an operator that relates the key and values.
properties:
key:
description: key is the label key that the selector applies
to.
type: string
operator:
description: operator represents a key's relationship to a
set of values. Valid operators are In, NotIn, Exists and
DoesNotExist.
type: string
values:
description: values is an array of string values. If the operator
is In or NotIn, the values array must be non-empty. If the
operator is Exists or DoesNotExist, the values array must
be empty. This array is replaced during a strategic merge
patch.
items:
type: string
type: array
required:
- key
- operator
type: object
type: array
matchLabels:
additionalProperties:
type: string
description: matchLabels is a map of {key,value} pairs. A single
{key,value} in the matchLabels map is equivalent to an element
of matchExpressions, whose key field is "key", the operator is
"In", and the values array contains only "value". The requirements
are ANDed.
type: object
type: object
storageCapacity:
description: StorageCapacity defines the size of persistent volume.
type: string
storageClass:
description: 'StorageClass defines the name of the StorageClass required
by the claim. More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#class-1'
type: string
volumeClaimTemplate:
description: VolumeClaimTemplate defines the volume claim template to
be created
type: string
required:
- backup
- etcd
- replicas
- selector
type: object
status:
description: EtcdStatus defines the observed state of Etcd
properties:
conditions:
items:
description: Condition holds the information about the state of a
resource.
properties:
lastTransitionTime:
description: Last time the condition transitioned from one status
to another.
format: date-time
type: string
lastUpdateTime:
description: Last time the condition was updated.
format: date-time
type: string
message:
description: A human readable message indicating details about
the transition.
type: string
reason:
description: The reason for the condition's last transition.
type: string
status:
description: Status of the condition, one of True, False, Unknown.
type: string
type:
description: Type of the Etcd condition.
type: string
type: object
type: array
currentReplicas:
format: int32
type: integer
etcd:
description: CrossVersionObjectReference contains enough information
to let you identify the referred resource.
properties:
apiVersion:
description: API version of the referent
type: string
kind:
description: Kind of the referent
type: string
name:
description: Name of the referent
type: string
type: object
labelSelector:
description: selector is a label query over pods that should match the
replica count. It must match the pod template's labels.
properties:
matchExpressions:
description: matchExpressions is a list of label selector requirements.
The requirements are ANDed.
items:
description: A label selector requirement is a selector that contains
values, a key, and an operator that relates the key and values.
properties:
key:
description: key is the label key that the selector applies
to.
type: string
operator:
description: operator represents a key's relationship to a
set of values. Valid operators are In, NotIn, Exists and
DoesNotExist.
type: string
values:
description: values is an array of string values. If the operator
is In or NotIn, the values array must be non-empty. If the
operator is Exists or DoesNotExist, the values array must
be empty. This array is replaced during a strategic merge
patch.
items:
type: string
type: array
required:
- key
- operator
type: object
type: array
matchLabels:
additionalProperties:
type: string
description: matchLabels is a map of {key,value} pairs. A single
{key,value} in the matchLabels map is equivalent to an element
of matchExpressions, whose key field is "key", the operator is
"In", and the values array contains only "value". The requirements
are ANDed.
type: object
type: object
lastError:
type: string
observedGeneration:
description: ObservedGeneration is the most recent generation observed
for this resource.
format: int64
type: integer
ready:
type: boolean
readyReplicas:
format: int32
type: integer
replicas:
format: int32
type: integer
serviceName:
type: string
updatedReplicas:
format: int32
type: integer
type: object
type: object
additionalPrinterColumns:
- name: Ready
type: string
JSONPath: .status.ready
- name: Age
type: date
JSONPath: .metadata.creationTimestamp
version: v1alpha1
versions:
- name: v1alpha1
served: true
storage: true
`
)