/
render_config_static_pods.go
257 lines (215 loc) · 7.35 KB
/
render_config_static_pods.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 (
"bytes"
"context"
"encoding/json"
"fmt"
"os"
"path/filepath"
"github.com/cosi-project/runtime/pkg/controller"
"github.com/cosi-project/runtime/pkg/safe"
"github.com/cosi-project/runtime/pkg/state"
"go.uber.org/zap"
"k8s.io/apimachinery/pkg/runtime"
k8sjson "k8s.io/apimachinery/pkg/runtime/serializer/json"
apiserverv1 "k8s.io/apiserver/pkg/apis/apiserver/v1"
auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
schedulerv1 "k8s.io/kube-scheduler/config/v1"
"github.com/siderolabs/talos/pkg/machinery/constants"
"github.com/siderolabs/talos/pkg/machinery/resources/k8s"
)
// RenderConfigsStaticPodController manages k8s.ConfigsReady and renders configs for the control plane.
type RenderConfigsStaticPodController struct{}
// Name implements controller.Controller interface.
func (ctrl *RenderConfigsStaticPodController) Name() string {
return "k8s.RenderConfigsStaticPodController"
}
// Inputs implements controller.Controller interface.
func (ctrl *RenderConfigsStaticPodController) Inputs() []controller.Input {
return []controller.Input{
{
Namespace: k8s.ControlPlaneNamespaceName,
Type: k8s.AdmissionControlConfigType,
Kind: controller.InputWeak,
},
{
Namespace: k8s.ControlPlaneNamespaceName,
Type: k8s.AuditPolicyConfigType,
Kind: controller.InputWeak,
},
{
Namespace: k8s.ControlPlaneNamespaceName,
Type: k8s.SchedulerConfigType,
Kind: controller.InputWeak,
},
}
}
// Outputs implements controller.Controller interface.
func (ctrl *RenderConfigsStaticPodController) Outputs() []controller.Output {
return []controller.Output{
{
Type: k8s.ConfigStatusType,
Kind: controller.OutputExclusive,
},
}
}
// Run implements controller.Controller interface.
//
//nolint:gocyclo
func (ctrl *RenderConfigsStaticPodController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) error {
for {
select {
case <-ctx.Done():
return nil
case <-r.EventCh():
}
admissionRes, err := safe.ReaderGetByID[*k8s.AdmissionControlConfig](ctx, r, k8s.AdmissionControlConfigID)
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return fmt.Errorf("error getting admission config resource: %w", err)
}
admissionConfig := admissionRes.TypedSpec()
auditRes, err := safe.ReaderGetByID[*k8s.AuditPolicyConfig](ctx, r, k8s.AuditPolicyConfigID)
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return fmt.Errorf("error getting audit config resource: %w", err)
}
auditConfig := auditRes.TypedSpec()
kubeSchedulerRes, err := safe.ReaderGetByID[*k8s.SchedulerConfig](ctx, r, k8s.SchedulerConfigID)
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return fmt.Errorf("error getting scheduler config resource: %w", err)
}
kubeSchedulerConfig := kubeSchedulerRes.TypedSpec()
type configFile struct {
filename string
f func() (runtime.Object, error)
}
serializer := k8sjson.NewSerializerWithOptions(
k8sjson.DefaultMetaFactory, nil, nil,
k8sjson.SerializerOptions{
Yaml: true,
Pretty: true,
Strict: true,
},
)
for _, pod := range []struct {
name string
directory string
uid int
gid int
configs []configFile
}{
{
name: "kube-apiserver",
directory: constants.KubernetesAPIServerConfigDir,
uid: constants.KubernetesAPIServerRunUser,
gid: constants.KubernetesAPIServerRunGroup,
configs: []configFile{
{
filename: "admission-control-config.yaml",
f: admissionControlConfig(admissionConfig),
},
{
filename: "auditpolicy.yaml",
f: auditPolicyConfig(auditConfig),
},
},
},
{
name: "kube-scheduler",
directory: constants.KubernetesSchedulerConfigDir,
uid: constants.KubernetesSchedulerRunUser,
gid: constants.KubernetesSchedulerRunGroup,
configs: []configFile{
{
filename: "scheduler-config.yaml",
f: schedulerConfig(kubeSchedulerConfig),
},
},
},
} {
if err = os.MkdirAll(pod.directory, 0o755); err != nil {
return fmt.Errorf("error creating config directory for %q: %w", pod.name, err)
}
for _, configFile := range pod.configs {
var obj runtime.Object
obj, err = configFile.f()
if err != nil {
return fmt.Errorf("error generating configuration %q for %q: %w", configFile.filename, pod.name, err)
}
var buf bytes.Buffer
if err = serializer.Encode(obj, &buf); err != nil {
return fmt.Errorf("error marshaling configuration %q for %q: %w", configFile.filename, pod.name, err)
}
if err = os.WriteFile(filepath.Join(pod.directory, configFile.filename), buf.Bytes(), 0o400); err != nil {
return fmt.Errorf("error writing configuration %q for %q: %w", configFile.filename, pod.name, err)
}
if err = os.Chown(filepath.Join(pod.directory, configFile.filename), pod.uid, pod.gid); err != nil {
return fmt.Errorf("error chowning %q for %q: %w", configFile.filename, pod.name, err)
}
}
}
if err = safe.WriterModify(ctx, r, k8s.NewConfigStatus(k8s.ControlPlaneNamespaceName, k8s.ConfigStatusStaticPodID), func(r *k8s.ConfigStatus) error {
r.TypedSpec().Ready = true
r.TypedSpec().Version = admissionRes.Metadata().Version().String() + auditRes.Metadata().Version().String() + kubeSchedulerRes.Metadata().Version().String()
return nil
}); err != nil {
return err
}
r.ResetRestartBackoff()
}
}
func admissionControlConfig(spec *k8s.AdmissionControlConfigSpec) func() (runtime.Object, error) {
return func() (runtime.Object, error) {
var cfg apiserverv1.AdmissionConfiguration
cfg.APIVersion = apiserverv1.SchemeGroupVersion.String()
cfg.Kind = "AdmissionConfiguration"
cfg.Plugins = []apiserverv1.AdmissionPluginConfiguration{}
for _, plugin := range spec.Config {
raw, err := json.Marshal(plugin.Configuration)
if err != nil {
return nil, fmt.Errorf("error marshaling configuration for plugin %q: %w", plugin.Name, err)
}
cfg.Plugins = append(cfg.Plugins,
apiserverv1.AdmissionPluginConfiguration{
Name: plugin.Name,
Configuration: &runtime.Unknown{
Raw: raw,
},
},
)
}
return &cfg, nil
}
}
func auditPolicyConfig(spec *k8s.AuditPolicyConfigSpec) func() (runtime.Object, error) {
return func() (runtime.Object, error) {
var cfg auditv1.Policy
if err := runtime.DefaultUnstructuredConverter.FromUnstructuredWithValidation(spec.Config, &cfg, true); err != nil {
return nil, fmt.Errorf("error unmarshaling audit policy configuration: %w", err)
}
return &cfg, nil
}
}
func schedulerConfig(spec *k8s.SchedulerConfigSpec) func() (runtime.Object, error) {
return func() (runtime.Object, error) {
var cfg schedulerv1.KubeSchedulerConfiguration
if err := runtime.DefaultUnstructuredConverter.FromUnstructuredWithValidation(spec.Config, &cfg, false); err != nil {
return nil, fmt.Errorf("error unmarshaling scheduler configuration: %w", err)
}
cfg.APIVersion = "kubescheduler.config.k8s.io/v1"
cfg.Kind = "KubeSchedulerConfiguration"
cfg.ClientConnection.Kubeconfig = filepath.Join(constants.KubernetesSchedulerSecretsDir, "kubeconfig")
return &cfg, nil
}
}