mirror of https://github.com/tailscale/tailscale/
cmd/k8s-operator,k8s-operator: optionally reconcile nameserver resources
Adds a new reconciler that reconciles DNSConfig resources. If a DNSConfig is deployed to cluster, the reconciler creates kube nameserver resources. This reconciler is only responsible for creating nameserver resources and not for populating nameserver's records. Signed-off-by: Irbe Krumina <irbe@tailscale.com>pull/11919/head
Irbe Krumina
2 months ago
parent
f82dfcc106
commit
54a1381192
@ -0,0 +1,4 @@
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: dnsconfig
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@ -0,0 +1,37 @@
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: nameserver
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spec:
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replicas: 1
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revisionHistoryLimit: 5
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selector:
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matchLabels:
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app: nameserver
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strategy:
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type: Recreate
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template:
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metadata:
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labels:
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app: nameserver
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spec:
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containers:
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- imagePullPolicy: IfNotPresent
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name: nameserver
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ports:
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- name: tcp
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protocol: TCP
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containerPort: 1053
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- name: udp
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protocol: UDP
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containerPort: 1053
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volumeMounts:
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- name: dnsconfig
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mountPath: /config
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restartPolicy: Always
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serviceAccount: nameserver
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serviceAccountName: nameserver
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volumes:
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- name: dnsconfig
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configMap:
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name: dnsconfig
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@ -0,0 +1,6 @@
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: nameserver
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imagePullSecrets:
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- name: foo
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@ -0,0 +1,16 @@
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apiVersion: v1
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kind: Service
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metadata:
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name: nameserver
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spec:
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selector:
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app: nameserver
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ports:
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- name: udp
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targetPort: 1053
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port: 53
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protocol: UDP
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- name: tcp
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targetPort: 1053
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port: 53
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protocol: TCP
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@ -0,0 +1,278 @@
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !plan9
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// tailscale-operator provides a way to expose services running in a Kubernetes
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// cluster to your Tailnet and to make Tailscale nodes available to cluster
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// workloads
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package main
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import (
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"context"
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"fmt"
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"slices"
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"sync"
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_ "embed"
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"github.com/pkg/errors"
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"go.uber.org/zap"
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xslices "golang.org/x/exp/slices"
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appsv1 "k8s.io/api/apps/v1"
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corev1 "k8s.io/api/core/v1"
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apiequality "k8s.io/apimachinery/pkg/api/equality"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/client-go/tools/record"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/reconcile"
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"sigs.k8s.io/yaml"
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tsoperator "tailscale.com/k8s-operator"
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tsapi "tailscale.com/k8s-operator/apis/v1alpha1"
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"tailscale.com/tstime"
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"tailscale.com/util/clientmetric"
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"tailscale.com/util/set"
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)
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const (
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reasonNameserverCreationFailed = "NameserverCreationFailed"
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reasonMultipleDNSConfigsPresent = "MultipleDNSConfigsPresent"
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reasonNameserverCreated = "NameserverCreated"
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messageNameserverCreationFailed = "Failed creating nameserver resources: %v"
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messageMultipleDNSConfigsPresent = "Multiple DNSConfig resources found in cluster. Please ensure no more than one is present."
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)
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// NameserverReconciler knows how to create nameserver resources in cluster in
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// response to users applying DNSConfig.
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type NameserverReconciler struct {
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client.Client
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logger *zap.SugaredLogger
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recorder record.EventRecorder
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clock tstime.Clock
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tsNamespace string
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mu sync.Mutex // protects following
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managedNameservers set.Slice[types.UID] // one or none
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}
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var (
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gaugeNameserverResources = clientmetric.NewGauge("k8s_nameserver_resources")
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)
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func (a *NameserverReconciler) Reconcile(ctx context.Context, req reconcile.Request) (res reconcile.Result, err error) {
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logger := a.logger.With("dnsConfig", req.Name)
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logger.Debugf("starting reconcile")
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defer logger.Debugf("reconcile finished")
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var dnsCfg tsapi.DNSConfig
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err = a.Get(ctx, req.NamespacedName, &dnsCfg)
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if apierrors.IsNotFound(err) {
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// Request object not found, could have been deleted after reconcile request.
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logger.Debugf("dnsconfig not found, assuming it was deleted")
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return reconcile.Result{}, nil
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} else if err != nil {
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return reconcile.Result{}, fmt.Errorf("failed to get dnsconfig: %w", err)
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}
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if !dnsCfg.DeletionTimestamp.IsZero() {
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ix := xslices.Index(dnsCfg.Finalizers, FinalizerName)
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if ix < 0 {
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logger.Debugf("no finalizer, nothing to do")
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return reconcile.Result{}, nil
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}
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logger.Info("Cleaning up DNSConfig resources")
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if err := a.maybeCleanup(ctx, &dnsCfg, logger); err != nil {
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logger.Errorf("error cleaning up reconciler resource: %v", err)
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return res, err
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}
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dnsCfg.Finalizers = append(dnsCfg.Finalizers[:ix], dnsCfg.Finalizers[ix+1:]...)
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if err := a.Update(ctx, &dnsCfg); err != nil {
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logger.Errorf("error removing finalizer: %v", err)
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return reconcile.Result{}, err
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}
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logger.Infof("Nameserver resources cleaned up")
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return reconcile.Result{}, nil
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}
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oldCnStatus := dnsCfg.Status.DeepCopy()
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setStatus := func(dnsCfg *tsapi.DNSConfig, conditionType tsapi.ConnectorConditionType, status metav1.ConditionStatus, reason, message string) (reconcile.Result, error) {
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tsoperator.SetDNSConfigCondition(dnsCfg, tsapi.NameserverReady, status, reason, message, dnsCfg.Generation, a.clock, logger)
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if !apiequality.Semantic.DeepEqual(oldCnStatus, dnsCfg.Status) {
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// An error encountered here should get returned by the Reconcile function.
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if updateErr := a.Client.Status().Update(ctx, dnsCfg); updateErr != nil {
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err = errors.Wrap(err, updateErr.Error())
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}
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}
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return res, err
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}
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var dnsCfgs tsapi.DNSConfigList
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if err := a.List(ctx, &dnsCfgs); err != nil {
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return res, fmt.Errorf("error listing DNSConfigs: %w", err)
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}
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if len(dnsCfgs.Items) > 1 { // enforce DNSConfig to be a singleton
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msg := "invalid cluster configuration: more than one tailscale.com/dnsconfigs found. Please ensure that no more than one is created."
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logger.Error(msg)
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a.recorder.Event(&dnsCfg, corev1.EventTypeWarning, reasonMultipleDNSConfigsPresent, messageMultipleDNSConfigsPresent)
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setStatus(&dnsCfg, tsapi.NameserverReady, metav1.ConditionFalse, reasonMultipleDNSConfigsPresent, messageMultipleDNSConfigsPresent)
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}
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if !slices.Contains(dnsCfg.Finalizers, FinalizerName) {
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logger.Infof("ensuring nameserver resources")
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dnsCfg.Finalizers = append(dnsCfg.Finalizers, FinalizerName)
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if err := a.Update(ctx, &dnsCfg); err != nil {
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msg := fmt.Sprintf(messageNameserverCreationFailed, err)
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logger.Error(msg)
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return setStatus(&dnsCfg, tsapi.NameserverReady, metav1.ConditionFalse, reasonNameserverCreationFailed, msg)
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}
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}
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if err := a.maybeProvision(ctx, &dnsCfg, logger); err != nil {
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return reconcile.Result{}, fmt.Errorf("error provisioning nameserver resources: %w", err)
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}
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a.mu.Lock()
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a.managedNameservers.Add(dnsCfg.UID)
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a.mu.Unlock()
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gaugeNameserverResources.Set(int64(a.managedNameservers.Len()))
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svc := &corev1.Service{
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ObjectMeta: metav1.ObjectMeta{Name: "nameserver", Namespace: a.tsNamespace},
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}
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if err := a.Client.Get(ctx, client.ObjectKeyFromObject(svc), svc); err != nil {
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return res, fmt.Errorf("error getting Service: %w", err)
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}
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if ip := svc.Spec.ClusterIP; ip != "" && ip != "None" {
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dnsCfg.Status.NameserverStatus = &tsapi.NameserverStatus{
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IP: ip,
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}
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return setStatus(&dnsCfg, tsapi.NameserverReady, metav1.ConditionTrue, reasonNameserverCreated, reasonNameserverCreated)
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}
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logger.Info("nameserver Service does not have an IP address allocated, waiting...")
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return reconcile.Result{}, nil
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}
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func nameserverResourceLabels(name, namespace string) map[string]string {
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labels := childResourceLabels(name, namespace, "nameserver")
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labels["app.kubernetes.io/name"] = "tailscale"
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labels["app.kubernetes.io/component"] = "nameserver"
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return labels
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}
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func (a *NameserverReconciler) maybeProvision(ctx context.Context, tsDNSCfg *tsapi.DNSConfig, logger *zap.SugaredLogger) error {
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labels := nameserverResourceLabels(tsDNSCfg.Name, a.tsNamespace)
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dCfg := &deployConfig{
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ownerRefs: []metav1.OwnerReference{*metav1.NewControllerRef(tsDNSCfg, tsapi.SchemeGroupVersion.WithKind("DNSConfig"))},
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namespace: a.tsNamespace,
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labels: labels,
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}
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if tsDNSCfg.Spec.Nameserver.Image.Repo != "" {
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dCfg.imageRepo = tsDNSCfg.Spec.Nameserver.Image.Repo
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}
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if tsDNSCfg.Spec.Nameserver.Image.Tag != "" {
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dCfg.imageTag = tsDNSCfg.Spec.Nameserver.Image.Tag
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}
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for _, deployable := range []deployable{saDeployable, deployDeployable, svcDeployable, cmDeployable} {
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if err := deployable.updateObj(ctx, dCfg, a.Client); err != nil {
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return fmt.Errorf("error reconciling %s: %w", deployable.kind, err)
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}
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}
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return nil
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}
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// maybeCleanup removes DNSConfig from being tracked. The cluster resources
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// created, will be automatically garbage collected as they are owned by the
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// DNSConfig.
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func (a *NameserverReconciler) maybeCleanup(ctx context.Context, dnsCfg *tsapi.DNSConfig, logger *zap.SugaredLogger) error {
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a.mu.Lock()
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a.managedNameservers.Remove(dnsCfg.UID)
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a.mu.Unlock()
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gaugeNameserverResources.Set(int64(a.managedNameservers.Len()))
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return nil
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}
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type deployable struct {
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kind string
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updateObj func(context.Context, *deployConfig, client.Client) error
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}
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type deployConfig struct {
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imageRepo string
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imageTag string
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labels map[string]string
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ownerRefs []metav1.OwnerReference
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namespace string
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}
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var (
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//go:embed deploy/manifests/nameserver/cm.yaml
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cmYaml []byte
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//go:embed deploy/manifests/nameserver/deploy.yaml
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deployYaml []byte
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//go:embed deploy/manifests/nameserver/sa.yaml
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saYaml []byte
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//go:embed deploy/manifests/nameserver/svc.yaml
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svcYaml []byte
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deployDeployable = deployable{
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kind: "Deployment",
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updateObj: func(ctx context.Context, cfg *deployConfig, kubeClient client.Client) error {
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d := new(appsv1.Deployment)
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if err := yaml.Unmarshal(deployYaml, &d); err != nil {
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return fmt.Errorf("error unmarshalling Deployment yaml: %w", err)
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}
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d.Spec.Template.Spec.Containers[0].Image = fmt.Sprintf("%s:%s", cfg.imageRepo, cfg.imageTag)
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d.ObjectMeta.Namespace = cfg.namespace
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d.ObjectMeta.Labels = cfg.labels
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d.ObjectMeta.OwnerReferences = cfg.ownerRefs
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updateF := func(oldD *appsv1.Deployment) {
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oldD.Spec = d.Spec
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}
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_, err := createOrUpdate[appsv1.Deployment](ctx, kubeClient, cfg.namespace, d, updateF)
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return err
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},
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}
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saDeployable = deployable{
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kind: "ServiceAccount",
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updateObj: func(ctx context.Context, cfg *deployConfig, kubeClient client.Client) error {
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sa := new(corev1.ServiceAccount)
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if err := yaml.Unmarshal(saYaml, &sa); err != nil {
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return fmt.Errorf("error unmarshalling ServiceAccount yaml: %w", err)
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}
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sa.ObjectMeta.Labels = cfg.labels
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sa.ObjectMeta.OwnerReferences = cfg.ownerRefs
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sa.ObjectMeta.Namespace = cfg.namespace
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_, err := createOrUpdate(ctx, kubeClient, cfg.namespace, sa, func(*corev1.ServiceAccount) {})
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return err
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},
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}
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svcDeployable = deployable{
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kind: "Service",
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updateObj: func(ctx context.Context, cfg *deployConfig, kubeClient client.Client) error {
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svc := new(corev1.Service)
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if err := yaml.Unmarshal(svcYaml, &svc); err != nil {
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return fmt.Errorf("error unmarshalling Service yaml: %w", err)
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}
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svc.ObjectMeta.Labels = cfg.labels
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svc.ObjectMeta.OwnerReferences = cfg.ownerRefs
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svc.ObjectMeta.Namespace = cfg.namespace
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_, err := createOrUpdate[corev1.Service](ctx, kubeClient, cfg.namespace, svc, func(*corev1.Service) {})
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return err
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},
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}
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cmDeployable = deployable{
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kind: "ConfigMap",
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updateObj: func(ctx context.Context, cfg *deployConfig, kubeClient client.Client) error {
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cm := new(corev1.ConfigMap)
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if err := yaml.Unmarshal(cmYaml, &cm); err != nil {
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return fmt.Errorf("error unmarshalling ConfigMap yaml: %w", err)
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}
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cm.ObjectMeta.Labels = cfg.labels
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cm.ObjectMeta.OwnerReferences = cfg.ownerRefs
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cm.ObjectMeta.Namespace = cfg.namespace
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_, err := createOrUpdate[corev1.ConfigMap](ctx, kubeClient, cfg.namespace, cm, func(cm *corev1.ConfigMap) {})
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return err
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},
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}
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)
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@ -0,0 +1,118 @@
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !plan9
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// tailscale-operator provides a way to expose services running in a Kubernetes
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// cluster to your Tailnet and to make Tailscale nodes available to cluster
|
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// workloads
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package main
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import (
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"encoding/json"
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"testing"
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"time"
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"go.uber.org/zap"
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appsv1 "k8s.io/api/apps/v1"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"sigs.k8s.io/controller-runtime/pkg/client/fake"
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"sigs.k8s.io/yaml"
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operatorutils "tailscale.com/k8s-operator"
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tsapi "tailscale.com/k8s-operator/apis/v1alpha1"
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"tailscale.com/tstest"
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"tailscale.com/util/mak"
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)
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func TestNameserverReconciler(t *testing.T) {
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dnsCfg := &tsapi.DNSConfig{
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TypeMeta: metav1.TypeMeta{Kind: "DNSConfig", APIVersion: "tailscale.com/v1alpha1"},
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ObjectMeta: metav1.ObjectMeta{
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Name: "test",
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},
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Spec: tsapi.DNSConfigSpec{
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Nameserver: &tsapi.Nameserver{
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Image: &tsapi.Image{
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Repo: "test",
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Tag: "v0.0.1",
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},
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},
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},
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}
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fc := fake.NewClientBuilder().
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WithScheme(tsapi.GlobalScheme).
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WithObjects(dnsCfg).
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WithStatusSubresource(dnsCfg).
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Build()
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zl, err := zap.NewDevelopment()
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if err != nil {
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t.Fatal(err)
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}
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cl := tstest.NewClock(tstest.ClockOpts{})
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nr := &NameserverReconciler{
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Client: fc,
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clock: cl,
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logger: zl.Sugar(),
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tsNamespace: "tailscale",
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}
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expectReconciled(t, nr, "", "test")
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// Verify that nameserver Deployment has been created and has the expected fields.
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wantsDeploy := &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: "nameserver", Namespace: "tailscale"}, TypeMeta: metav1.TypeMeta{Kind: "Deployment", APIVersion: appsv1.SchemeGroupVersion.Identifier()}}
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if err := yaml.Unmarshal(deployYaml, wantsDeploy); err != nil {
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t.Fatalf("unmarshalling yaml: %v", err)
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}
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dnsCfgOwnerRef := metav1.NewControllerRef(dnsCfg, tsapi.SchemeGroupVersion.WithKind("DNSConfig"))
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wantsDeploy.OwnerReferences = []metav1.OwnerReference{*dnsCfgOwnerRef}
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wantsDeploy.Spec.Template.Spec.Containers[0].Image = "test:v0.0.1"
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wantsDeploy.Namespace = "tailscale"
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labels := nameserverResourceLabels("test", "tailscale")
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wantsDeploy.ObjectMeta.Labels = labels
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expectEqual(t, fc, wantsDeploy)
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// Verify that DNSConfig advertizes the nameserver's Service IP address,
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// has the ready status condition and tailscale finalizer.
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mustUpdate(t, fc, "tailscale", "nameserver", func(svc *corev1.Service) {
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svc.Spec.ClusterIP = "1.2.3.4"
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})
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expectReconciled(t, nr, "", "test")
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dnsCfg.Status.NameserverStatus = &tsapi.NameserverStatus{
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IP: "1.2.3.4",
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}
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dnsCfg.Finalizers = []string{FinalizerName}
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dnsCfg.Status.Conditions = append(dnsCfg.Status.Conditions, tsapi.ConnectorCondition{
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Type: tsapi.NameserverReady,
|
||||
Status: metav1.ConditionTrue,
|
||||
Reason: reasonNameserverCreated,
|
||||
Message: reasonNameserverCreated,
|
||||
LastTransitionTime: &metav1.Time{Time: cl.Now().Truncate(time.Second)},
|
||||
})
|
||||
expectEqual(t, fc, dnsCfg)
|
||||
|
||||
// // Verify that nameserver image gets updated to match DNSConfig spec.
|
||||
mustUpdate(t, fc, "", "test", func(dnsCfg *tsapi.DNSConfig) {
|
||||
dnsCfg.Spec.Nameserver.Image.Tag = "v0.0.2"
|
||||
})
|
||||
expectReconciled(t, nr, "", "test")
|
||||
wantsDeploy.Spec.Template.Spec.Containers[0].Image = "test:v0.0.2"
|
||||
expectEqual(t, fc, wantsDeploy)
|
||||
|
||||
// Verify that when another actor sets ConfigMap data, it does not get
|
||||
// overwritten by nameserver reconciler.
|
||||
dnsRecords := &operatorutils.Records{Version: "v1alpha1", IP4: map[string][]string{"foo.ts.net": {"1.2.3.4"}}}
|
||||
bs, err := json.Marshal(dnsRecords)
|
||||
if err != nil {
|
||||
t.Fatalf("error marshalling ConfigMap contents: %v", err)
|
||||
}
|
||||
mustUpdate(t, fc, "tailscale", "dnsconfig", func(cm *corev1.ConfigMap) {
|
||||
mak.Set(&cm.Data, "dns.json", string(bs))
|
||||
})
|
||||
expectReconciled(t, nr, "", "test")
|
||||
wantCm := &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: "dnsconfig",
|
||||
Namespace: "tailscale", Labels: labels, OwnerReferences: []metav1.OwnerReference{*dnsCfgOwnerRef}},
|
||||
TypeMeta: metav1.TypeMeta{Kind: "ConfigMap", APIVersion: "v1"},
|
||||
Data: map[string]string{"dns.json": string(bs)},
|
||||
}
|
||||
expectEqual(t, fc, wantCm)
|
||||
}
|
||||
Loading…
Reference in New Issue