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coredns.go
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coredns.go
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// Copyright 2022 Clastix Labs
// SPDX-License-Identifier: Apache-2.0
package addons
import (
"bytes"
"context"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/log"
kamajiv1alpha1 "github.com/clastix/kamaji/api/v1alpha1"
"github.com/clastix/kamaji/internal/kubeadm"
"github.com/clastix/kamaji/internal/resources"
"github.com/clastix/kamaji/internal/resources/utils"
"github.com/clastix/kamaji/internal/utilities"
)
type CoreDNS struct {
Client client.Client
deployment *appsv1.Deployment
configMap *corev1.ConfigMap
service *corev1.Service
clusterRole *rbacv1.ClusterRole
clusterRoleBinding *rbacv1.ClusterRoleBinding
serviceAccount *corev1.ServiceAccount
}
func (c *CoreDNS) Define(context.Context, *kamajiv1alpha1.TenantControlPlane) error {
c.deployment = &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: kubeadm.CoreDNSName,
Namespace: kubeadm.KubeSystemNamespace,
},
}
c.configMap = &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: kubeadm.CoreDNSName,
Namespace: kubeadm.KubeSystemNamespace,
},
}
c.service = &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: kubeadm.CoreDNSServiceName,
Namespace: kubeadm.KubeSystemNamespace,
},
}
c.clusterRole = &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: kubeadm.CoreDNSClusterRoleName,
},
}
c.clusterRoleBinding = &rbacv1.ClusterRoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: kubeadm.CoreDNSClusterRoleBindingName,
},
}
c.serviceAccount = &corev1.ServiceAccount{
ObjectMeta: metav1.ObjectMeta{
Name: kubeadm.CoreDNSName,
Namespace: kubeadm.KubeSystemNamespace,
},
}
return nil
}
func (c *CoreDNS) ShouldCleanup(tcp *kamajiv1alpha1.TenantControlPlane) bool {
return tcp.Spec.Addons.CoreDNS == nil
}
func (c *CoreDNS) CleanUp(ctx context.Context, tcp *kamajiv1alpha1.TenantControlPlane) (bool, error) {
logger := log.FromContext(ctx, "resource", "kubeadm_addons", "addon", c.GetName())
tenantClient, err := utilities.GetTenantClient(ctx, c.Client, tcp)
if err != nil {
logger.Error(err, "cannot generate Tenant client")
return false, err
}
var deleted bool
for _, obj := range []client.Object{c.serviceAccount, c.clusterRoleBinding, c.clusterRole, c.service, c.configMap, c.deployment} {
if err = tenantClient.Delete(ctx, obj); err != nil {
if k8serrors.IsNotFound(err) {
continue
}
return false, err
}
deleted = deleted || err == nil
}
return deleted, nil
}
func (c *CoreDNS) CreateOrUpdate(ctx context.Context, tcp *kamajiv1alpha1.TenantControlPlane) (controllerutil.OperationResult, error) {
logger := log.FromContext(ctx, "addon", c.GetName())
tenantClient, err := utilities.GetTenantClient(ctx, c.Client, tcp)
if err != nil {
logger.Error(err, "cannot generate Tenant client")
return controllerutil.OperationResultNone, err
}
if err = c.decodeManifests(ctx, tcp); err != nil {
logger.Error(err, "manifest decoding failed")
return controllerutil.OperationResultNone, err
}
var operationResult controllerutil.OperationResult
reconciliationResult := controllerutil.OperationResultNone
// ClusterRoleBinding
operationResult, err = c.mutateClusterRoleBinding(ctx, tenantClient)
if err != nil {
logger.Error(err, "ClusterRoleBinding reconciliation failed")
return controllerutil.OperationResultNone, err
}
reconciliationResult = utils.UpdateOperationResult(reconciliationResult, operationResult)
// Deployment
operationResult, err = c.mutateDeployment(ctx, tenantClient)
if err != nil {
logger.Error(err, "Deployment reconciliation failed")
return controllerutil.OperationResultNone, err
}
reconciliationResult = utils.UpdateOperationResult(reconciliationResult, operationResult)
// ConfigMap
operationResult, err = c.mutateConfigMap(ctx, tenantClient)
if err != nil {
logger.Error(err, "ConfigMap reconciliation failed")
return controllerutil.OperationResultNone, err
}
reconciliationResult = utils.UpdateOperationResult(reconciliationResult, operationResult)
// Service
operationResult, err = c.mutateService(ctx, tenantClient)
if err != nil {
logger.Error(err, "Service reconciliation failed")
return controllerutil.OperationResultNone, err
}
reconciliationResult = utils.UpdateOperationResult(reconciliationResult, operationResult)
// ClusterRole
operationResult, err = c.mutateClusterRole(ctx, tenantClient)
if err != nil {
logger.Error(err, "ClusterRole reconciliation failed")
return controllerutil.OperationResultNone, err
}
reconciliationResult = utils.UpdateOperationResult(reconciliationResult, operationResult)
// ServiceAccount
operationResult, err = c.mutateServiceAccount(ctx, tenantClient)
if err != nil {
logger.Error(err, "ServiceAccount reconciliation failed")
return controllerutil.OperationResultNone, err
}
reconciliationResult = utils.UpdateOperationResult(reconciliationResult, operationResult)
return reconciliationResult, nil
}
func (c *CoreDNS) GetName() string {
return "coredns"
}
func (c *CoreDNS) ShouldStatusBeUpdated(_ context.Context, tcp *kamajiv1alpha1.TenantControlPlane) bool {
return tcp.Spec.Addons.CoreDNS != nil && !tcp.Status.Addons.CoreDNS.Enabled
}
func (c *CoreDNS) UpdateTenantControlPlaneStatus(_ context.Context, tcp *kamajiv1alpha1.TenantControlPlane) error {
tcp.Status.Addons.CoreDNS.Enabled = tcp.Spec.Addons.CoreDNS != nil
tcp.Status.Addons.CoreDNS.LastUpdate = metav1.Now()
return nil
}
func (c *CoreDNS) decodeManifests(ctx context.Context, tcp *kamajiv1alpha1.TenantControlPlane) error {
tcpClient, config, err := resources.GetKubeadmManifestDeps(ctx, c.Client, tcp)
if err != nil {
return errors.Wrap(err, "unable to create manifests dependencies")
}
// If CoreDNS addon is enabled and with an override, adding these to the kubeadm init configuration
config.Parameters.CoreDNSOptions = &kubeadm.AddonOptions{}
if len(tcp.Spec.Addons.CoreDNS.ImageRepository) > 0 {
config.Parameters.CoreDNSOptions.Repository = tcp.Spec.Addons.CoreDNS.ImageRepository
}
if len(tcp.Spec.Addons.CoreDNS.ImageRepository) > 0 {
config.Parameters.CoreDNSOptions.Tag = tcp.Spec.Addons.CoreDNS.ImageTag
}
manifests, err := kubeadm.AddCoreDNS(tcpClient, config)
if err != nil {
return errors.Wrap(err, "unable to generate manifests")
}
parts := bytes.Split(manifests, []byte("---"))
if err = utilities.DecodeFromYAML(string(parts[1]), c.deployment); err != nil {
return errors.Wrap(err, "unable to decode Deployment manifest")
}
if err = utilities.DecodeFromYAML(string(parts[2]), c.configMap); err != nil {
return errors.Wrap(err, "unable to decode ConfigMap manifest")
}
if err = utilities.DecodeFromYAML(string(parts[3]), c.service); err != nil {
return errors.Wrap(err, "unable to decode Service manifest")
}
if err = utilities.DecodeFromYAML(string(parts[4]), c.clusterRole); err != nil {
return errors.Wrap(err, "unable to decode ClusterRole manifest")
}
if err = utilities.DecodeFromYAML(string(parts[5]), c.clusterRoleBinding); err != nil {
return errors.Wrap(err, "unable to decode ClusterRoleBinding manifest")
}
if err = utilities.DecodeFromYAML(string(parts[6]), c.serviceAccount); err != nil {
return errors.Wrap(err, "unable to decode ServiceAccount manifest")
}
return nil
}
func (c *CoreDNS) mutateClusterRoleBinding(ctx context.Context, tenantClient client.Client) (controllerutil.OperationResult, error) {
crb := &rbacv1.ClusterRoleBinding{}
crb.SetName(c.clusterRoleBinding.GetName())
defer func() {
c.clusterRoleBinding.SetUID(crb.GetUID())
}()
return utilities.CreateOrUpdateWithConflict(ctx, tenantClient, crb, func() error {
crb.SetLabels(c.clusterRoleBinding.GetLabels())
crb.SetAnnotations(c.clusterRoleBinding.GetAnnotations())
crb.Subjects = c.clusterRoleBinding.Subjects
crb.RoleRef = c.clusterRoleBinding.RoleRef
return nil
})
}
func (c *CoreDNS) mutateDeployment(ctx context.Context, tenantClient client.Client) (controllerutil.OperationResult, error) {
d := &appsv1.Deployment{}
d.SetName(c.deployment.GetName())
d.SetNamespace(c.deployment.GetNamespace())
return utilities.CreateOrUpdateWithConflict(ctx, tenantClient, d, func() error {
d.SetLabels(c.deployment.GetLabels())
d.SetAnnotations(utilities.MergeMaps(d.GetAnnotations(), c.deployment.GetAnnotations()))
d.Spec.Replicas = c.deployment.Spec.Replicas
d.Spec.Selector = c.deployment.Spec.Selector
d.Spec.Template.ObjectMeta.SetLabels(c.deployment.Spec.Template.ObjectMeta.GetLabels())
if len(d.Spec.Template.Spec.Volumes) != 1 {
d.Spec.Template.Spec.Volumes = make([]corev1.Volume, 1)
}
d.Spec.Template.Spec.Volumes[0].Name = c.deployment.Spec.Template.Spec.Volumes[0].Name
if d.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap == nil {
d.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap = &corev1.ConfigMapVolumeSource{}
}
d.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.LocalObjectReference.Name = c.deployment.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.LocalObjectReference.Name
if len(d.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.Items) == 0 {
d.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.Items = make([]corev1.KeyToPath, 1)
}
d.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.Items[0].Key = c.deployment.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.Items[0].Key
d.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.Items[0].Path = c.deployment.Spec.Template.Spec.Volumes[0].VolumeSource.ConfigMap.Items[0].Path
if len(d.Spec.Template.Spec.Containers) == 0 {
d.Spec.Template.Spec.Containers = make([]corev1.Container, 1)
}
d.Spec.Template.Spec.Containers[0].Name = c.deployment.Spec.Template.Spec.Containers[0].Name
d.Spec.Template.Spec.Containers[0].Image = c.deployment.Spec.Template.Spec.Containers[0].Image
d.Spec.Template.Spec.Containers[0].Args = c.deployment.Spec.Template.Spec.Containers[0].Args
if len(d.Spec.Template.Spec.Containers[0].Ports) != 3 {
d.Spec.Template.Spec.Containers[0].Ports = make([]corev1.ContainerPort, 3)
}
d.Spec.Template.Spec.Containers[0].Ports[0].Name = c.deployment.Spec.Template.Spec.Containers[0].Ports[0].Name
d.Spec.Template.Spec.Containers[0].Ports[0].ContainerPort = c.deployment.Spec.Template.Spec.Containers[0].Ports[0].ContainerPort
d.Spec.Template.Spec.Containers[0].Ports[0].Protocol = c.deployment.Spec.Template.Spec.Containers[0].Ports[0].Protocol
d.Spec.Template.Spec.Containers[0].Ports[1].Name = c.deployment.Spec.Template.Spec.Containers[0].Ports[1].Name
d.Spec.Template.Spec.Containers[0].Ports[1].ContainerPort = c.deployment.Spec.Template.Spec.Containers[0].Ports[1].ContainerPort
d.Spec.Template.Spec.Containers[0].Ports[1].Protocol = c.deployment.Spec.Template.Spec.Containers[0].Ports[1].Protocol
d.Spec.Template.Spec.Containers[0].Ports[2].Name = c.deployment.Spec.Template.Spec.Containers[0].Ports[2].Name
d.Spec.Template.Spec.Containers[0].Ports[2].ContainerPort = c.deployment.Spec.Template.Spec.Containers[0].Ports[2].ContainerPort
d.Spec.Template.Spec.Containers[0].Ports[2].Protocol = c.deployment.Spec.Template.Spec.Containers[0].Ports[2].Protocol
d.Spec.Template.Spec.Containers[0].Resources = c.deployment.Spec.Template.Spec.Containers[0].Resources
if len(d.Spec.Template.Spec.Containers[0].VolumeMounts) == 0 {
d.Spec.Template.Spec.Containers[0].VolumeMounts = make([]corev1.VolumeMount, 1)
}
d.Spec.Template.Spec.Containers[0].VolumeMounts[0].Name = c.deployment.Spec.Template.Spec.Containers[0].VolumeMounts[0].Name
d.Spec.Template.Spec.Containers[0].VolumeMounts[0].ReadOnly = c.deployment.Spec.Template.Spec.Containers[0].VolumeMounts[0].ReadOnly
d.Spec.Template.Spec.Containers[0].VolumeMounts[0].MountPath = c.deployment.Spec.Template.Spec.Containers[0].VolumeMounts[0].MountPath
if d.Spec.Template.Spec.Containers[0].LivenessProbe == nil {
d.Spec.Template.Spec.Containers[0].LivenessProbe = &corev1.Probe{}
}
d.Spec.Template.Spec.Containers[0].LivenessProbe.HTTPGet = c.deployment.Spec.Template.Spec.Containers[0].LivenessProbe.HTTPGet
d.Spec.Template.Spec.Containers[0].LivenessProbe.InitialDelaySeconds = c.deployment.Spec.Template.Spec.Containers[0].LivenessProbe.InitialDelaySeconds
d.Spec.Template.Spec.Containers[0].LivenessProbe.TimeoutSeconds = c.deployment.Spec.Template.Spec.Containers[0].LivenessProbe.TimeoutSeconds
d.Spec.Template.Spec.Containers[0].LivenessProbe.SuccessThreshold = c.deployment.Spec.Template.Spec.Containers[0].LivenessProbe.SuccessThreshold
d.Spec.Template.Spec.Containers[0].LivenessProbe.FailureThreshold = c.deployment.Spec.Template.Spec.Containers[0].LivenessProbe.FailureThreshold
if d.Spec.Template.Spec.Containers[0].ReadinessProbe == nil {
d.Spec.Template.Spec.Containers[0].ReadinessProbe = &corev1.Probe{}
}
d.Spec.Template.Spec.Containers[0].ReadinessProbe.HTTPGet = c.deployment.Spec.Template.Spec.Containers[0].ReadinessProbe.HTTPGet
if d.Spec.Template.Spec.Containers[0].SecurityContext == nil {
d.Spec.Template.Spec.Containers[0].SecurityContext = &corev1.SecurityContext{}
}
d.Spec.Template.Spec.Containers[0].SecurityContext.Capabilities = c.deployment.Spec.Template.Spec.Containers[0].SecurityContext.Capabilities
d.Spec.Template.Spec.Containers[0].SecurityContext.ReadOnlyRootFilesystem = c.deployment.Spec.Template.Spec.Containers[0].SecurityContext.ReadOnlyRootFilesystem
d.Spec.Template.Spec.Containers[0].SecurityContext.AllowPrivilegeEscalation = c.deployment.Spec.Template.Spec.Containers[0].SecurityContext.AllowPrivilegeEscalation
d.Spec.Template.Spec.DNSPolicy = c.deployment.Spec.Template.Spec.DNSPolicy
d.Spec.Template.Spec.NodeSelector = c.deployment.Spec.Template.Spec.NodeSelector
d.Spec.Template.Spec.ServiceAccountName = c.deployment.Spec.Template.Spec.ServiceAccountName
if d.Spec.Template.Spec.Affinity == nil {
d.Spec.Template.Spec.Affinity = &corev1.Affinity{
PodAntiAffinity: &corev1.PodAntiAffinity{},
}
}
d.Spec.Template.Spec.Affinity.PodAffinity = c.deployment.Spec.Template.Spec.Affinity.PodAffinity
d.Spec.Template.Spec.Tolerations = c.deployment.Spec.Template.Spec.Tolerations
d.Spec.Template.Spec.PriorityClassName = c.deployment.Spec.Template.Spec.PriorityClassName
d.Spec.Strategy.Type = c.deployment.Spec.Strategy.Type
return controllerutil.SetControllerReference(c.clusterRoleBinding, d, tenantClient.Scheme())
})
}
func (c *CoreDNS) mutateConfigMap(ctx context.Context, tenantClient client.Client) (controllerutil.OperationResult, error) {
cm := &corev1.ConfigMap{}
cm.SetName(c.configMap.GetName())
cm.SetNamespace(c.configMap.GetNamespace())
return utilities.CreateOrUpdateWithConflict(ctx, tenantClient, cm, func() error {
cm.SetLabels(c.configMap.GetLabels())
cm.SetAnnotations(utilities.MergeMaps(cm.GetAnnotations(), c.configMap.GetAnnotations()))
cm.Data = c.configMap.Data
return controllerutil.SetControllerReference(c.clusterRoleBinding, cm, tenantClient.Scheme())
})
}
func (c *CoreDNS) mutateService(ctx context.Context, tenantClient client.Client) (controllerutil.OperationResult, error) {
svc := &corev1.Service{}
svc.SetName(c.service.GetName())
svc.SetNamespace(c.service.GetNamespace())
return utilities.CreateOrUpdateWithConflict(ctx, tenantClient, svc, func() error {
svc.SetLabels(c.service.GetLabels())
svc.SetAnnotations(utilities.MergeMaps(svc.GetAnnotations(), c.service.GetAnnotations()))
svc.Spec.Ports = c.service.Spec.Ports
svc.Spec.Selector = c.service.Spec.Selector
svc.Spec.ClusterIP = c.service.Spec.ClusterIP
return controllerutil.SetControllerReference(c.clusterRoleBinding, svc, tenantClient.Scheme())
})
}
func (c *CoreDNS) mutateClusterRole(ctx context.Context, tenantClient client.Client) (controllerutil.OperationResult, error) {
cr := &rbacv1.ClusterRole{}
cr.SetName(c.clusterRole.GetName())
cr.SetNamespace(c.clusterRole.GetNamespace())
return utilities.CreateOrUpdateWithConflict(ctx, tenantClient, cr, func() error {
cr.SetLabels(c.clusterRole.GetLabels())
cr.SetAnnotations(utilities.MergeMaps(cr.GetAnnotations(), c.clusterRole.GetAnnotations()))
cr.Rules = c.clusterRole.Rules
return controllerutil.SetControllerReference(c.clusterRoleBinding, cr, tenantClient.Scheme())
})
}
func (c *CoreDNS) mutateServiceAccount(ctx context.Context, tenantClient client.Client) (controllerutil.OperationResult, error) {
sa := &corev1.ServiceAccount{}
sa.SetName(c.serviceAccount.GetName())
sa.SetNamespace(c.serviceAccount.GetNamespace())
return utilities.CreateOrUpdateWithConflict(ctx, tenantClient, sa, func() error {
sa.SetLabels(c.serviceAccount.GetLabels())
sa.SetAnnotations(utilities.MergeMaps(sa.GetAnnotations(), c.serviceAccount.GetAnnotations()))
return controllerutil.SetControllerReference(c.clusterRoleBinding, sa, tenantClient.Scheme())
})
}