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ensurer.go
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ensurer.go
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// Copyright (c) 2019 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 controlplane
import (
"context"
"github.com/gardener/gardener-extension-provider-openstack/pkg/openstack"
"github.com/coreos/go-systemd/v22/unit"
"github.com/gardener/gardener/extensions/pkg/controller/csimigration"
extensionswebhook "github.com/gardener/gardener/extensions/pkg/webhook"
"github.com/gardener/gardener/extensions/pkg/webhook/controlplane"
"github.com/gardener/gardener/extensions/pkg/webhook/controlplane/genericmutator"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/go-logr/logr"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
kubeletconfigv1beta1 "k8s.io/kubelet/config/v1beta1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const csiMigrationVersion = "1.19"
// NewEnsurer creates a new controlplane ensurer.
func NewEnsurer(logger logr.Logger) genericmutator.Ensurer {
return &ensurer{
logger: logger.WithName("openstack-controlplane-ensurer"),
}
}
type ensurer struct {
genericmutator.NoopEnsurer
client client.Client
logger logr.Logger
}
// InjectClient injects the given client into the ensurer.
func (e *ensurer) InjectClient(client client.Client) error {
e.client = client
return nil
}
// EnsureKubeAPIServerDeployment ensures that the kube-apiserver deployment conforms to the provider requirements.
func (e *ensurer) EnsureKubeAPIServerDeployment(ctx context.Context, ectx genericmutator.EnsurerContext, new, _ *appsv1.Deployment) error {
template := &new.Spec.Template
ps := &template.Spec
cluster, err := ectx.GetCluster(ctx)
if err != nil {
return err
}
csiEnabled, csiMigrationComplete, err := csimigration.CheckCSIConditions(cluster, csiMigrationVersion)
if err != nil {
return err
}
if c := extensionswebhook.ContainerWithName(ps.Containers, "kube-apiserver"); c != nil {
ensureKubeAPIServerCommandLineArgs(c, csiEnabled, csiMigrationComplete)
ensureKubeAPIServerVolumeMounts(c, csiEnabled, csiMigrationComplete)
}
ensureKubeAPIServerVolumes(ps, csiEnabled, csiMigrationComplete)
return e.ensureChecksumAnnotations(ctx, &new.Spec.Template, new.Namespace, csiEnabled, csiMigrationComplete)
}
// EnsureKubeControllerManagerDeployment ensures that the kube-controller-manager deployment conforms to the provider requirements.
func (e *ensurer) EnsureKubeControllerManagerDeployment(ctx context.Context, ectx genericmutator.EnsurerContext, new, _ *appsv1.Deployment) error {
template := &new.Spec.Template
ps := &template.Spec
cluster, err := ectx.GetCluster(ctx)
if err != nil {
return err
}
csiEnabled, csiMigrationComplete, err := csimigration.CheckCSIConditions(cluster, csiMigrationVersion)
if err != nil {
return err
}
if c := extensionswebhook.ContainerWithName(ps.Containers, "kube-controller-manager"); c != nil {
ensureKubeControllerManagerCommandLineArgs(c, csiEnabled, csiMigrationComplete)
ensureKubeControllerManagerVolumeMounts(c, csiEnabled, csiMigrationComplete)
}
ensureKubeControllerManagerLabels(template, csiEnabled, csiMigrationComplete)
ensureKubeControllerManagerVolumes(ps, csiEnabled, csiMigrationComplete)
return e.ensureChecksumAnnotations(ctx, &new.Spec.Template, new.Namespace, csiEnabled, csiMigrationComplete)
}
// EnsureKubeSchedulerDeployment ensures that the kube-scheduler deployment conforms to the provider requirements.
func (e *ensurer) EnsureKubeSchedulerDeployment(ctx context.Context, ectx genericmutator.EnsurerContext, new, _ *appsv1.Deployment) error {
template := &new.Spec.Template
ps := &template.Spec
cluster, err := ectx.GetCluster(ctx)
if err != nil {
return err
}
csiEnabled, csiMigrationComplete, err := csimigration.CheckCSIConditions(cluster, csiMigrationVersion)
if err != nil {
return err
}
if c := extensionswebhook.ContainerWithName(ps.Containers, "kube-scheduler"); c != nil {
ensureKubeSchedulerCommandLineArgs(c, csiEnabled, csiMigrationComplete)
}
return nil
}
func ensureKubeAPIServerCommandLineArgs(c *corev1.Container, csiEnabled, csiMigrationComplete bool) {
if csiEnabled {
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigration=true", ",")
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigrationOpenStack=true", ",")
if csiMigrationComplete {
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigrationOpenStackComplete=true", ",")
c.Command = extensionswebhook.EnsureNoStringWithPrefix(c.Command, "--cloud-provider=")
c.Command = extensionswebhook.EnsureNoStringWithPrefix(c.Command, "--cloud-config=")
c.Command = extensionswebhook.EnsureNoStringWithPrefixContains(c.Command, "--enable-admission-plugins=",
"PersistentVolumeLabel", ",")
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--disable-admission-plugins=",
"PersistentVolumeLabel", ",")
return
}
}
c.Command = extensionswebhook.EnsureStringWithPrefix(c.Command, "--cloud-provider=", "openstack")
c.Command = extensionswebhook.EnsureStringWithPrefix(c.Command, "--cloud-config=",
"/etc/kubernetes/cloudprovider/cloudprovider.conf")
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--enable-admission-plugins=",
"PersistentVolumeLabel", ",")
c.Command = extensionswebhook.EnsureNoStringWithPrefixContains(c.Command, "--disable-admission-plugins=",
"PersistentVolumeLabel", ",")
}
func ensureKubeControllerManagerCommandLineArgs(c *corev1.Container, csiEnabled, csiMigrationComplete bool) {
c.Command = extensionswebhook.EnsureStringWithPrefix(c.Command, "--cloud-provider=", "external")
if csiEnabled {
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigration=true", ",")
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigrationOpenStack=true", ",")
if csiMigrationComplete {
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigrationOpenStackComplete=true", ",")
c.Command = extensionswebhook.EnsureNoStringWithPrefix(c.Command, "--cloud-config=")
c.Command = extensionswebhook.EnsureNoStringWithPrefix(c.Command, "--external-cloud-volume-plugin=")
return
}
}
c.Command = extensionswebhook.EnsureStringWithPrefix(c.Command, "--cloud-config=",
"/etc/kubernetes/cloudprovider/cloudprovider.conf")
c.Command = extensionswebhook.EnsureStringWithPrefix(c.Command, "--external-cloud-volume-plugin=", "openstack")
}
func ensureKubeSchedulerCommandLineArgs(c *corev1.Container, csiEnabled, csiMigrationComplete bool) {
if csiEnabled {
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigration=true", ",")
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigrationOpenStack=true", ",")
if csiMigrationComplete {
c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
"CSIMigrationOpenStackComplete=true", ",")
return
}
}
}
func ensureKubeControllerManagerLabels(t *corev1.PodTemplateSpec, csiEnabled, csiMigrationComplete bool) {
// TODO: This can be removed in a future version.
delete(t.Labels, v1beta1constants.LabelNetworkPolicyToBlockedCIDRs)
if csiEnabled && csiMigrationComplete {
delete(t.Labels, v1beta1constants.LabelNetworkPolicyToPublicNetworks)
delete(t.Labels, v1beta1constants.LabelNetworkPolicyToPrivateNetworks)
return
}
t.Labels = extensionswebhook.EnsureAnnotationOrLabel(t.Labels, v1beta1constants.LabelNetworkPolicyToPublicNetworks, v1beta1constants.LabelNetworkPolicyAllowed)
t.Labels = extensionswebhook.EnsureAnnotationOrLabel(t.Labels, v1beta1constants.LabelNetworkPolicyToPrivateNetworks, v1beta1constants.LabelNetworkPolicyAllowed)
}
var (
etcSSLName = "etc-ssl"
etcSSLVolumeMount = corev1.VolumeMount{
Name: etcSSLName,
MountPath: "/etc/ssl",
ReadOnly: true,
}
directoryOrCreate = corev1.HostPathDirectoryOrCreate
etcSSLVolume = corev1.Volume{
Name: etcSSLName,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: "/etc/ssl",
Type: &directoryOrCreate,
},
},
}
usrShareCACertificatesName = "usr-share-ca-certificates"
usrShareCACertificatesVolumeMount = corev1.VolumeMount{
Name: usrShareCACertificatesName,
MountPath: "/usr/share/ca-certificates",
ReadOnly: true,
}
usrShareCACertificatesVolume = corev1.Volume{
Name: usrShareCACertificatesName,
VolumeSource: corev1.VolumeSource{
HostPath: &corev1.HostPathVolumeSource{
Path: "/usr/share/ca-certificates",
},
},
}
cloudProviderDiskConfigVolumeMount = corev1.VolumeMount{
Name: openstack.CloudProviderDiskConfigName,
MountPath: "/etc/kubernetes/cloudprovider",
}
cloudProviderDiskConfigVolume = corev1.Volume{
Name: openstack.CloudProviderDiskConfigName,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{
SecretName: openstack.CloudProviderDiskConfigName,
},
},
}
)
func ensureKubeAPIServerVolumeMounts(c *corev1.Container, csiEnabled, csiMigrationComplete bool) {
if csiEnabled && csiMigrationComplete {
c.VolumeMounts = extensionswebhook.EnsureNoVolumeMountWithName(c.VolumeMounts, cloudProviderDiskConfigVolumeMount.Name)
return
}
c.VolumeMounts = extensionswebhook.EnsureVolumeMountWithName(c.VolumeMounts, cloudProviderDiskConfigVolumeMount)
// TODO: remove this in a future version.
// previous openstack versions (no CSI) ensure a volume mount with name `usr-share-ca-certificates` with path `/usr/share/ca-certificates`
// however Gardener version > 1.10.0 adds (if feature flag `MountHostCADirectories` is enabled) an API Server volume with name `usr-share-cacerts` also with path `/usr/share/ca-certificates`
// volume mount `usr-share-ca-certificates` needs to be removed to not have a duplicate `/usr/share/ca-certificates` mount
c.VolumeMounts = extensionswebhook.EnsureNoVolumeMountWithName(c.VolumeMounts, usrShareCACertificatesVolumeMount.Name)
}
func ensureKubeControllerManagerVolumeMounts(c *corev1.Container, csiEnabled, csiMigrationComplete bool) {
if csiEnabled && csiMigrationComplete {
c.VolumeMounts = extensionswebhook.EnsureNoVolumeMountWithName(c.VolumeMounts, cloudProviderDiskConfigVolumeMount.Name)
c.VolumeMounts = extensionswebhook.EnsureNoVolumeMountWithName(c.VolumeMounts, etcSSLVolumeMount.Name)
c.VolumeMounts = extensionswebhook.EnsureNoVolumeMountWithName(c.VolumeMounts, usrShareCACertificatesVolumeMount.Name)
return
}
c.VolumeMounts = extensionswebhook.EnsureVolumeMountWithName(c.VolumeMounts, cloudProviderDiskConfigVolumeMount)
// Host certificates are mounted to accommodate OpenStack endpoints that might be served with a certificate
// signed by a CA that is not globally trusted.
c.VolumeMounts = extensionswebhook.EnsureVolumeMountWithName(c.VolumeMounts, etcSSLVolumeMount)
c.VolumeMounts = extensionswebhook.EnsureVolumeMountWithName(c.VolumeMounts, usrShareCACertificatesVolumeMount)
}
func ensureKubeAPIServerVolumes(ps *corev1.PodSpec, csiEnabled, csiMigrationComplete bool) {
if csiEnabled && csiMigrationComplete {
ps.Volumes = extensionswebhook.EnsureNoVolumeWithName(ps.Volumes, cloudProviderDiskConfigVolume.Name)
return
}
ps.Volumes = extensionswebhook.EnsureVolumeWithName(ps.Volumes, cloudProviderDiskConfigVolume)
// TODO: remove this in a future version.
// previous openstack versions (no CSI) ensure a volume with name `usr-share-ca-certificates` with path `/usr/share/ca-certificates`
// however Gardener version > 1.10.0 adds (if feature flag `MountHostCADirectories` is enabled) an API Server volume with name `usr-share-cacerts` also with path `/usr/share/ca-certificates`
// volume `usr-share-ca-certificates` needs to be removed to not have a duplicate `/usr/share/ca-certificates` mount
ps.Volumes = extensionswebhook.EnsureNoVolumeWithName(ps.Volumes, usrShareCACertificatesVolume.Name)
}
func ensureKubeControllerManagerVolumes(ps *corev1.PodSpec, csiEnabled, csiMigrationComplete bool) {
if csiEnabled && csiMigrationComplete {
ps.Volumes = extensionswebhook.EnsureNoVolumeWithName(ps.Volumes, cloudProviderDiskConfigVolume.Name)
ps.Volumes = extensionswebhook.EnsureNoVolumeWithName(ps.Volumes, etcSSLVolume.Name)
ps.Volumes = extensionswebhook.EnsureNoVolumeWithName(ps.Volumes, usrShareCACertificatesVolume.Name)
return
}
ps.Volumes = extensionswebhook.EnsureVolumeWithName(ps.Volumes, cloudProviderDiskConfigVolume)
// Host certificates are mounted to accommodate OpenStack endpoints that might be served with a certificate
// signed by a CA that is not globally trusted.
ps.Volumes = extensionswebhook.EnsureVolumeWithName(ps.Volumes, etcSSLVolume)
ps.Volumes = extensionswebhook.EnsureVolumeWithName(ps.Volumes, usrShareCACertificatesVolume)
}
func (e *ensurer) ensureChecksumAnnotations(ctx context.Context, template *corev1.PodTemplateSpec, namespace string, csiEnabled, csiMigrationComplete bool) error {
if csiEnabled && csiMigrationComplete {
delete(template.Annotations, "checksum/secret-"+v1beta1constants.SecretNameCloudProvider)
delete(template.Annotations, "checksum/secret-"+openstack.CloudProviderConfigName)
return nil
}
return controlplane.EnsureSecretChecksumAnnotation(ctx, template, e.client, namespace, openstack.CloudProviderConfigName)
}
// EnsureKubeletServiceUnitOptions ensures that the kubelet.service unit options conform to the provider requirements.
func (e *ensurer) EnsureKubeletServiceUnitOptions(ctx context.Context, ectx genericmutator.EnsurerContext, new, _ []*unit.UnitOption) ([]*unit.UnitOption, error) {
cluster, err := ectx.GetCluster(ctx)
if err != nil {
return nil, err
}
csiEnabled, _, err := csimigration.CheckCSIConditions(cluster, csiMigrationVersion)
if err != nil {
return nil, err
}
if opt := extensionswebhook.UnitOptionWithSectionAndName(new, "Service", "ExecStart"); opt != nil {
command := extensionswebhook.DeserializeCommandLine(opt.Value)
command = ensureKubeletCommandLineArgs(command, csiEnabled)
opt.Value = extensionswebhook.SerializeCommandLine(command, 1, " \\\n ")
}
new = extensionswebhook.EnsureUnitOption(new, &unit.UnitOption{
Section: "Service",
Name: "ExecStartPre",
Value: `/bin/sh -c 'hostnamectl set-hostname $(cat /etc/hostname | cut -d '.' -f 1)'`,
})
return new, nil
}
func ensureKubeletCommandLineArgs(command []string, csiEnabled bool) []string {
if csiEnabled {
command = extensionswebhook.EnsureStringWithPrefix(command, "--cloud-provider=", "external")
command = extensionswebhook.EnsureStringWithPrefix(command, "--enable-controller-attach-detach=", "true")
} else {
command = extensionswebhook.EnsureStringWithPrefix(command, "--cloud-provider=", "openstack")
command = extensionswebhook.EnsureStringWithPrefix(command, "--cloud-config=", "/var/lib/kubelet/cloudprovider.conf")
}
return command
}
// EnsureKubeletConfiguration ensures that the kubelet configuration conforms to the provider requirements.
func (e *ensurer) EnsureKubeletConfiguration(ctx context.Context, ectx genericmutator.EnsurerContext, new, old *kubeletconfigv1beta1.KubeletConfiguration) error {
cluster, err := ectx.GetCluster(ctx)
if err != nil {
return err
}
csiEnabled, _, err := csimigration.CheckCSIConditions(cluster, csiMigrationVersion)
if err != nil {
return err
}
if csiEnabled {
if new.FeatureGates == nil {
new.FeatureGates = make(map[string]bool)
}
new.FeatureGates["CSIMigration"] = true
new.FeatureGates["CSIMigrationOpenStack"] = true
// kubelets of new worker nodes can directly be started with the the `CSIMigrationOpenStackComplete` feature gate
new.FeatureGates["CSIMigrationOpenStackComplete"] = true
}
return nil
}
// ShouldProvisionKubeletCloudProviderConfig returns true if the cloud provider config file should be added to the kubelet configuration.
func (e *ensurer) ShouldProvisionKubeletCloudProviderConfig(ctx context.Context, ectx genericmutator.EnsurerContext) bool {
cluster, err := ectx.GetCluster(ctx)
if err != nil {
return false
}
csiEnabled, _, err := csimigration.CheckCSIConditions(cluster, csiMigrationVersion)
if err != nil {
return false
}
return !csiEnabled
}
// EnsureKubeletCloudProviderConfig ensures that the cloud provider config file conforms to the provider requirements.
func (e *ensurer) EnsureKubeletCloudProviderConfig(ctx context.Context, ectx genericmutator.EnsurerContext, data *string, namespace string) error {
secret := corev1.Secret{}
if err := e.client.Get(ctx, kutil.Key(namespace, openstack.CloudProviderDiskConfigName), &secret); err != nil {
if apierrors.IsNotFound(err) {
e.logger.Info("secret not found", "name", openstack.CloudProviderDiskConfigName, "namespace", namespace)
return nil
}
return errors.Wrapf(err, "could not get secret '%s/%s'", namespace, openstack.CloudProviderDiskConfigName)
}
if secret.Data == nil || secret.Data[openstack.CloudProviderConfigDataKey] == nil {
return nil
}
*data = string(secret.Data[openstack.CloudProviderConfigDataKey])
return nil
}