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kubelet_static_pod.go
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kubelet_static_pod.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package k8s
import (
"context"
"fmt"
"time"
"github.com/cosi-project/runtime/pkg/controller"
"github.com/cosi-project/runtime/pkg/resource"
"github.com/cosi-project/runtime/pkg/safe"
"github.com/cosi-project/runtime/pkg/state"
"github.com/siderolabs/gen/optional"
"go.uber.org/zap"
k8sadapter "github.com/aenix-io/talm/internal/app/machined/pkg/adapters/k8s"
"github.com/siderolabs/talos/pkg/kubernetes/kubelet"
"github.com/siderolabs/talos/pkg/machinery/resources/k8s"
"github.com/siderolabs/talos/pkg/machinery/resources/secrets"
"github.com/siderolabs/talos/pkg/machinery/resources/v1alpha1"
)
// KubeletStaticPodController renders static pod definitions and manages k8s.StaticPodStatus.
type KubeletStaticPodController struct{}
// Name implements controller.Controller interface.
func (ctrl *KubeletStaticPodController) Name() string {
return "k8s.KubeletStaticPodController"
}
// Inputs implements controller.Controller interface.
func (ctrl *KubeletStaticPodController) Inputs() []controller.Input {
return []controller.Input{
{
Namespace: k8s.NamespaceName,
Type: k8s.NodenameType,
ID: optional.Some(k8s.NodenameID),
Kind: controller.InputWeak,
},
{
Namespace: v1alpha1.NamespaceName,
Type: v1alpha1.ServiceType,
ID: optional.Some("kubelet"),
Kind: controller.InputWeak,
},
{
Namespace: secrets.NamespaceName,
Type: secrets.KubernetesDynamicCertsType,
ID: optional.Some(secrets.KubernetesDynamicCertsID),
Kind: controller.InputWeak,
},
{
Namespace: secrets.NamespaceName,
Type: secrets.KubernetesRootType,
ID: optional.Some(secrets.KubernetesRootID),
Kind: controller.InputWeak,
},
}
}
// Outputs implements controller.Controller interface.
func (ctrl *KubeletStaticPodController) Outputs() []controller.Output {
return []controller.Output{
{
Type: k8s.StaticPodStatusType,
Kind: controller.OutputExclusive,
},
}
}
// Run implements controller.Controller interface.
//
//nolint:gocyclo
func (ctrl *KubeletStaticPodController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) error {
var kubeletClient *kubelet.Client
refreshTicker := time.NewTicker(15 * time.Second) // refresh kubelet pods status every 15 seconds
defer refreshTicker.Stop()
for {
select {
case <-ctx.Done():
return nil
case <-refreshTicker.C:
if kubeletClient != nil {
if err := ctrl.refreshPodStatus(ctx, r, kubeletClient); err != nil {
return fmt.Errorf("error refreshing pod status: %w", err)
}
}
continue
case <-r.EventCh():
}
kubeletService, err := safe.ReaderGet[*v1alpha1.Service](ctx, r, resource.NewMetadata(v1alpha1.NamespaceName, v1alpha1.ServiceType, "kubelet", resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
kubeletClient = nil
if err = ctrl.teardownStatuses(ctx, r); err != nil {
return fmt.Errorf("error tearing down: %w", err)
}
continue
}
return err
}
if !kubeletService.TypedSpec().Running {
kubeletClient = nil
if err = ctrl.teardownStatuses(ctx, r); err != nil {
return fmt.Errorf("error tearing down: %w", err)
}
continue
}
// on worker nodes, there's no way to connect to the kubelet to fetch the pod status (only API server can do that)
// on control plane nodes, use API servers' client kubelet certificate to fetch statuses
rootSecrets, err := safe.ReaderGet[*secrets.KubernetesRoot](ctx, r, resource.NewMetadata(secrets.NamespaceName, secrets.KubernetesRootType, secrets.KubernetesRootID, resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
kubeletClient = nil
continue
}
return err
}
certsResource, err := safe.ReaderGet[*secrets.KubernetesDynamicCerts](
ctx, r,
resource.NewMetadata(secrets.NamespaceName, secrets.KubernetesDynamicCertsType, secrets.KubernetesDynamicCertsID, resource.VersionUndefined),
)
if err != nil {
if state.IsNotFoundError(err) {
kubeletClient = nil
continue
}
return err
}
certs := certsResource.TypedSpec()
nodename, err := safe.ReaderGet[*k8s.Nodename](ctx, r, resource.NewMetadata(k8s.NamespaceName, k8s.NodenameType, k8s.NodenameID, resource.VersionUndefined))
if err != nil {
// nodename should exist if the kubelet is running
return err
}
kubeletClient, err = kubelet.NewClient(
nodename.TypedSpec().Nodename,
certs.APIServerKubeletClient.Crt,
certs.APIServerKubeletClient.Key,
rootSecrets.TypedSpec().IssuingCA.Crt,
)
if err != nil {
return fmt.Errorf("error building kubelet client: %w", err)
}
r.ResetRestartBackoff()
}
}
func (ctrl *KubeletStaticPodController) teardownStatuses(ctx context.Context, r controller.Runtime) error {
statuses, err := r.List(ctx, resource.NewMetadata(k8s.NamespaceName, k8s.StaticPodStatusType, "", resource.VersionUndefined))
if err != nil {
return fmt.Errorf("error listing pod statuses: %w", err)
}
for _, status := range statuses.Items {
// TODO: proper teardown sequence?
if err = r.Destroy(ctx, status.Metadata()); err != nil {
return fmt.Errorf("error destroying stale pod status: %w", err)
}
}
return nil
}
func (ctrl *KubeletStaticPodController) refreshPodStatus(ctx context.Context, r controller.Runtime, kubeletClient *kubelet.Client) error {
podList, err := kubeletClient.Pods(ctx)
if err != nil {
return fmt.Errorf("error fetching pod status: %w", err)
}
podsSeen := map[string]struct{}{}
for _, pod := range podList.Items {
switch pod.Metadata.Annotations.ConfigSource {
case "file":
// static pod from a file source
case "http":
// static pod from an HTTP source
default:
// anything else is not a static pod, skip it
continue
}
statusID := fmt.Sprintf("%s/%s", pod.Metadata.Namespace, pod.Metadata.Name)
podsSeen[statusID] = struct{}{}
if err = safe.WriterModify(ctx, r, k8s.NewStaticPodStatus(k8s.NamespaceName, statusID), func(r *k8s.StaticPodStatus) error {
return k8sadapter.StaticPodStatus(r).SetStatus(&pod.Status)
}); err != nil {
return fmt.Errorf("error updating pod status: %w", err)
}
}
statuses, err := r.List(ctx, resource.NewMetadata(k8s.NamespaceName, k8s.StaticPodStatusType, "", resource.VersionUndefined))
if err != nil {
return fmt.Errorf("error listing pod statuses: %w", err)
}
for _, status := range statuses.Items {
if _, exists := podsSeen[status.Metadata().ID()]; !exists {
// TODO: proper teardown sequence?
if err = r.Destroy(ctx, status.Metadata()); err != nil {
return fmt.Errorf("error destroying stale pod status: %w", err)
}
}
}
return nil
}