/
self_hosted.go
354 lines (277 loc) · 11.6 KB
/
self_hosted.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 kubernetes
import (
"context"
"encoding/json"
"fmt"
"strings"
"time"
"github.com/talos-systems/go-retry/retry"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/client-go/kubernetes"
"github.com/talos-systems/talos/pkg/cluster"
"github.com/talos-systems/talos/pkg/machinery/constants"
)
// UpgradeSelfHosted the Kubernetes control plane.
func UpgradeSelfHosted(ctx context.Context, cluster cluster.K8sProvider, options UpgradeOptions) error {
switch path := options.Path(); path {
case "1.18->1.19":
fallthrough
case "1.19->1.19":
return hyperkubeUpgrade(ctx, cluster, options)
case "1.19->1.20":
options.extraUpdaters = append(options.extraUpdaters, addControlPlaneToleration())
options.podCheckpointerExtraUpdaters = append(options.podCheckpointerExtraUpdaters, addControlPlaneToleration())
serviceAccountUpdater, err := kubeAPIServerServiceAccountPatch(options)
if err != nil {
return err
}
options.extraUpdaters = append(options.extraUpdaters, serviceAccountUpdater)
if err = serviceAccountSecretsUpdate(ctx, cluster); err != nil {
return err
}
return hyperkubeUpgrade(ctx, cluster, options)
case "1.20->1.20":
fallthrough
case "1.20->1.21":
fallthrough
case "1.21->1.21":
return hyperkubeUpgrade(ctx, cluster, options)
default:
return fmt.Errorf("unsupported upgrade path %q (from %q to %q)", path, options.FromVersion, options.ToVersion)
}
}
// hyperkubeUpgrade upgrades from hyperkube-based to distroless images in 1.19.
func hyperkubeUpgrade(ctx context.Context, cluster cluster.K8sProvider, options UpgradeOptions) error {
clientset, err := cluster.K8sClient(ctx)
if err != nil {
return fmt.Errorf("error building K8s client: %w", err)
}
if err = podCheckpointerGracePeriod(ctx, clientset, "0m"); err != nil {
return fmt.Errorf("error setting pod-checkpointer grace period: %w", err)
}
graceTimeout := 5 * time.Minute
fmt.Printf("sleeping %s to let the pod-checkpointer self-checkpoint be updated\n", graceTimeout.String())
time.Sleep(graceTimeout)
daemonsets := []string{kubeAPIServer, kubeControllerManager, kubeScheduler, kubeProxy}
for _, ds := range daemonsets {
if err = hyperkubeUpgradeDs(ctx, clientset, ds, options); err != nil {
return fmt.Errorf("failed updating daemonset %q: %w", ds, err)
}
}
if err = podCheckpointerGracePeriod(ctx, clientset, graceTimeout.String(), options.podCheckpointerExtraUpdaters...); err != nil {
return fmt.Errorf("error setting pod-checkpointer grace period: %w", err)
}
return nil
}
//nolint:gocyclo
func updateDaemonset(ctx context.Context, clientset *kubernetes.Clientset, ds string, updateFunc func(daemonset *appsv1.DaemonSet) error) error {
daemonset, err := clientset.AppsV1().DaemonSets(namespace).Get(ctx, ds, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("error fetching daemonset: %w", err)
}
oldData, err := json.Marshal(daemonset)
if err != nil {
return fmt.Errorf("error marshaling deployment: %w", err)
}
if err = updateFunc(daemonset); err != nil {
return err
}
newData, err := json.Marshal(daemonset)
if err != nil {
return fmt.Errorf("error marshaling new deployment: %w", err)
}
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, appsv1.DaemonSet{})
if err != nil {
return fmt.Errorf("failed to create two way merge patch: %w", err)
}
_, err = clientset.AppsV1().DaemonSets(namespace).Patch(ctx, daemonset.Name, types.StrategicMergePatchType, patchBytes, metav1.PatchOptions{
FieldManager: "talos",
})
if err != nil {
return fmt.Errorf("error patching deployment: %w", err)
}
// give k8s some time
time.Sleep(10 * time.Second)
return retry.Constant(5*time.Minute, retry.WithUnits(10*time.Second)).Retry(func() error {
daemonset, err = clientset.AppsV1().DaemonSets(namespace).Get(ctx, ds, metav1.GetOptions{})
if err != nil {
if retryableError(err) {
return retry.ExpectedError(err)
}
return retry.UnexpectedError(fmt.Errorf("error fetching daemonset: %w", err))
}
if daemonset.Status.UpdatedNumberScheduled != daemonset.Status.DesiredNumberScheduled {
return retry.ExpectedError(fmt.Errorf("expected current number up-to-date for %s to be %d, got %d", ds, daemonset.Status.UpdatedNumberScheduled, daemonset.Status.CurrentNumberScheduled))
}
if daemonset.Status.CurrentNumberScheduled != daemonset.Status.DesiredNumberScheduled {
return retry.ExpectedError(fmt.Errorf("expected current number scheduled for %s to be %d, got %d", ds, daemonset.Status.DesiredNumberScheduled, daemonset.Status.CurrentNumberScheduled))
}
if daemonset.Status.NumberAvailable != daemonset.Status.DesiredNumberScheduled {
return retry.ExpectedError(fmt.Errorf("expected number available for %s to be %d, got %d", ds, daemonset.Status.DesiredNumberScheduled, daemonset.Status.NumberAvailable))
}
if daemonset.Status.NumberReady != daemonset.Status.DesiredNumberScheduled {
return retry.ExpectedError(fmt.Errorf("expected number ready for %s to be %d, got %d", ds, daemonset.Status.DesiredNumberScheduled, daemonset.Status.NumberReady))
}
return nil
})
}
func podCheckpointerGracePeriod(ctx context.Context, clientset *kubernetes.Clientset, gracePeriod string, extraUpdaters ...daemonsetUpdater) error {
fmt.Printf("updating pod-checkpointer grace period to %q\n", gracePeriod)
return updateDaemonset(ctx, clientset, "pod-checkpointer", func(daemonset *appsv1.DaemonSet) error {
if len(daemonset.Spec.Template.Spec.Containers) != 1 {
return fmt.Errorf("unexpected number of containers: %d", len(daemonset.Spec.Template.Spec.Containers))
}
args := daemonset.Spec.Template.Spec.Containers[0].Command
for i := range args {
if strings.HasPrefix(args[i], "--checkpoint-grace-period=") {
args[i] = fmt.Sprintf("--checkpoint-grace-period=%s", gracePeriod)
}
}
for _, updater := range extraUpdaters {
if err := updater("pod-checkpointer", daemonset); err != nil {
return err
}
}
return nil
})
}
//nolint:gocyclo
func hyperkubeUpgradeDs(ctx context.Context, clientset *kubernetes.Clientset, ds string, options UpgradeOptions) error {
if ds == kubeAPIServer {
fmt.Printf("temporarily taking %q out of pod-checkpointer control\n", ds)
if err := updateDaemonset(ctx, clientset, ds, func(daemonset *appsv1.DaemonSet) error {
delete(daemonset.Spec.Template.Annotations, checkpointerAnnotation)
return nil
}); err != nil {
return err
}
}
fmt.Printf("updating daemonset %q to version %q\n", ds, options.ToVersion)
return updateDaemonset(ctx, clientset, ds, func(daemonset *appsv1.DaemonSet) error {
if len(daemonset.Spec.Template.Spec.Containers) != 1 {
return fmt.Errorf("unexpected number of containers: %d", len(daemonset.Spec.Template.Spec.Containers))
}
args := daemonset.Spec.Template.Spec.Containers[0].Command
if args[0] == "./hyperkube" || args[0] == "/hyperkube" {
args[0] = "/go-runner"
args[1] = fmt.Sprintf("/usr/local/bin/%s", ds)
if ds == kubeProxy {
daemonset.Spec.Template.Spec.Containers[0].Command = daemonset.Spec.Template.Spec.Containers[0].Command[1:]
}
}
switch ds {
case kubeAPIServer:
daemonset.Spec.Template.Spec.Containers[0].Image = fmt.Sprintf("%s:v%s", constants.KubernetesAPIServerImage, options.ToVersion)
case kubeControllerManager:
daemonset.Spec.Template.Spec.Containers[0].Image = fmt.Sprintf("%s:v%s", constants.KubernetesControllerManagerImage, options.ToVersion)
case kubeScheduler:
daemonset.Spec.Template.Spec.Containers[0].Image = fmt.Sprintf("%s:v%s", constants.KubernetesSchedulerImage, options.ToVersion)
case kubeProxy:
daemonset.Spec.Template.Spec.Containers[0].Image = fmt.Sprintf("%s:v%s", constants.KubernetesProxyImage, options.ToVersion)
default:
return fmt.Errorf("failed to build new image spec")
}
if ds == kubeAPIServer {
if daemonset.Spec.Template.Annotations == nil {
daemonset.Spec.Template.Annotations = make(map[string]string)
}
daemonset.Spec.Template.Annotations[checkpointerAnnotation] = "true"
}
for _, updater := range options.extraUpdaters {
if err := updater(ds, daemonset); err != nil {
return err
}
}
return nil
})
}
func serviceAccountSecretsUpdate(ctx context.Context, cluster cluster.K8sProvider) error {
const serviceAccountKey = "service-account.key"
clientset, err := cluster.K8sClient(ctx)
if err != nil {
return fmt.Errorf("error building K8s client: %w", err)
}
apiServerSecrets, err := clientset.CoreV1().Secrets(namespace).Get(ctx, kubeAPIServer, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("error fetching kube-apiserver secrets: %w", err)
}
if _, ok := apiServerSecrets.Data[serviceAccountKey]; ok {
return nil
}
controllerManagerSecrets, err := clientset.CoreV1().Secrets(namespace).Get(ctx, kubeControllerManager, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("error fetching kube-controller-manager secrets: %w", err)
}
if _, ok := controllerManagerSecrets.Data[serviceAccountKey]; !ok {
return fmt.Errorf("kube-controller-manager secrets missing %q secret", serviceAccountKey)
}
apiServerSecrets.Data[serviceAccountKey] = controllerManagerSecrets.Data[serviceAccountKey]
_, err = clientset.CoreV1().Secrets(namespace).Update(ctx, apiServerSecrets, metav1.UpdateOptions{})
if err != nil {
return fmt.Errorf("error updating kube-apiserver secrets: %w", err)
}
fmt.Printf("patched kube-apiserver secrets for %q\n", serviceAccountKey)
return nil
}
func addControlPlaneToleration() daemonsetUpdater {
return func(ds string, daemonset *appsv1.DaemonSet) error {
if ds == kubeProxy {
return nil
}
tolerationFound := false
for _, toleration := range daemonset.Spec.Template.Spec.Tolerations {
if toleration.Key == constants.LabelNodeRoleControlPlane {
tolerationFound = true
break
}
}
if tolerationFound {
return nil
}
daemonset.Spec.Template.Spec.Tolerations = append(daemonset.Spec.Template.Spec.Tolerations, corev1.Toleration{
Key: constants.LabelNodeRoleControlPlane,
Operator: corev1.TolerationOpExists,
Effect: corev1.TaintEffectNoSchedule,
})
return nil
}
}
func kubeAPIServerServiceAccountPatch(options UpgradeOptions) (daemonsetUpdater, error) {
if options.ControlPlaneEndpoint == "" {
return nil, fmt.Errorf("control plane endpoint is required for service account patch")
}
return func(ds string, daemonset *appsv1.DaemonSet) error {
if ds != kubeAPIServer {
return nil
}
argExists := func(argName string) bool {
prefix := fmt.Sprintf("--%s=", argName)
for _, arg := range daemonset.Spec.Template.Spec.Containers[0].Command {
if strings.HasPrefix(arg, prefix) {
return true
}
}
return false
}
if !argExists("api-audiences") {
daemonset.Spec.Template.Spec.Containers[0].Command = append(daemonset.Spec.Template.Spec.Containers[0].Command,
fmt.Sprintf("--api-audiences=%s", options.ControlPlaneEndpoint))
}
if !argExists("service-account-issuer") {
daemonset.Spec.Template.Spec.Containers[0].Command = append(daemonset.Spec.Template.Spec.Containers[0].Command,
fmt.Sprintf("--service-account-issuer=%s", options.ControlPlaneEndpoint))
}
if !argExists("service-account-signing-key") {
daemonset.Spec.Template.Spec.Containers[0].Command = append(daemonset.Spec.Template.Spec.Containers[0].Command,
"--service-account-signing-key-file=/etc/kubernetes/secrets/service-account.key")
}
return nil
}, nil
}