319 lines
12 KiB
Go
319 lines
12 KiB
Go
/*
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Copyright 2021 The actions-runner-controller authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controllers
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import (
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"context"
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"reflect"
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"time"
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appsv1 "k8s.io/api/apps/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/types"
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"github.com/go-logr/logr"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/tools/record"
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ctrl "sigs.k8s.io/controller-runtime"
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"sigs.k8s.io/controller-runtime/pkg/client"
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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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"github.com/actions-runner-controller/actions-runner-controller/api/v1alpha1"
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"github.com/actions-runner-controller/actions-runner-controller/controllers/metrics"
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)
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const (
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LabelKeyRunnerSetName = "runnerset-name"
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)
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// RunnerSetReconciler reconciles a Runner object
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type RunnerSetReconciler struct {
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Name string
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client.Client
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Log logr.Logger
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Recorder record.EventRecorder
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Scheme *runtime.Scheme
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CommonRunnerLabels []string
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GitHubBaseURL string
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RunnerImage string
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DockerImage string
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DockerRegistryMirror string
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}
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// +kubebuilder:rbac:groups=actions.summerwind.dev,resources=runnersets,verbs=get;list;watch;create;update;patch;delete
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// +kubebuilder:rbac:groups=actions.summerwind.dev,resources=runnersets/finalizers,verbs=get;list;watch;create;update;patch;delete
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// +kubebuilder:rbac:groups=actions.summerwind.dev,resources=runnersets/status,verbs=get;update;patch
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// +kubebuilder:rbac:groups=apps,resources=statefulsets,verbs=get;list;watch;create;update;patch;delete
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// +kubebuilder:rbac:groups=apps,resources=statefulsets/status,verbs=get;update;patch
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// +kubebuilder:rbac:groups=core,resources=events,verbs=create;patch
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// +kubebuilder:rbac:groups=coordination.k8s.io,resources=leases,verbs=get;list;create;update
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// Note that coordination.k8s.io/leases permission must be added to any of the controllers to avoid the following error:
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// E0613 07:02:08.004278 1 leaderelection.go:325] error retrieving resource lock actions-runner-system/actions-runner-controller: leases.coordination.k8s.io "actions-runner-controller" is forbidden: User "system:serviceaccount:actions-runner-system:actions-runner-controller" cannot get resource "leases" in API group "coordination.k8s.io" in the namespace "actions-runner-system"
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func (r *RunnerSetReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
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log := r.Log.WithValues("runnerset", req.NamespacedName)
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runnerSet := &v1alpha1.RunnerSet{}
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if err := r.Get(ctx, req.NamespacedName, runnerSet); err != nil {
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err = client.IgnoreNotFound(err)
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if err != nil {
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log.Error(err, "Could not get RunnerSet")
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}
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return ctrl.Result{}, err
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}
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if !runnerSet.ObjectMeta.DeletionTimestamp.IsZero() {
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return ctrl.Result{}, nil
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}
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metrics.SetRunnerSet(*runnerSet)
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desiredStatefulSet, err := r.newStatefulSet(runnerSet)
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if err != nil {
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r.Recorder.Event(runnerSet, corev1.EventTypeNormal, "RunnerAutoscalingFailure", err.Error())
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log.Error(err, "Could not create statefulset")
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return ctrl.Result{}, err
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}
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liveStatefulSet := &appsv1.StatefulSet{}
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if err := r.Get(ctx, types.NamespacedName{Namespace: runnerSet.Namespace, Name: runnerSet.Name}, liveStatefulSet); err != nil {
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if !errors.IsNotFound(err) {
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log.Error(err, "Failed to get live statefulset")
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return ctrl.Result{}, err
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}
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if err := r.Client.Create(ctx, desiredStatefulSet); err != nil {
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log.Error(err, "Failed to create statefulset resource")
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return ctrl.Result{}, err
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}
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return ctrl.Result{}, nil
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}
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liveTemplateHash, ok := getStatefulSetTemplateHash(liveStatefulSet)
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if !ok {
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log.Info("Failed to get template hash of newest statefulset resource. It must be in an invalid state. Please manually delete the statefulset so that it is recreated")
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return ctrl.Result{}, nil
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}
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desiredTemplateHash, ok := getStatefulSetTemplateHash(desiredStatefulSet)
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if !ok {
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log.Info("Failed to get template hash of desired statefulset. It must be in an invalid state. Please manually delete the statefulset so that it is recreated")
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return ctrl.Result{}, nil
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}
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if liveTemplateHash != desiredTemplateHash {
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copy := liveStatefulSet.DeepCopy()
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copy.Spec = desiredStatefulSet.Spec
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if err := r.Client.Patch(ctx, copy, client.MergeFrom(liveStatefulSet)); err != nil {
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log.Error(err, "Failed to patch statefulset", "reason", errors.ReasonForError(err))
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if errors.IsInvalid(err) {
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// NOTE: This might not be ideal but deal the forbidden error by recreating the statefulset
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// Probably we'd better create a registration-only runner to prevent queued jobs from immediately failing.
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//
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// 2021-06-13T07:19:52.760Z ERROR actions-runner-controller.runnerset Failed to patch statefulset
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// {"runnerset": "default/example-runnerset", "error": "StatefulSet.apps \"example-runnerset\" is invalid: s
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// pec: Forbidden: updates to statefulset spec for fields other than 'replicas', 'template', and 'updateStrategy'
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// are forbidden"}
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//
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// Even though the error message includes "Forbidden", this error's reason is "Invalid".
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// That's why we're using errors.IsInvalid above.
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if err := r.Client.Delete(ctx, liveStatefulSet); err != nil {
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log.Error(err, "Failed to delete statefulset for force-update")
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return ctrl.Result{}, err
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}
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log.Info("Deleted statefulset for force-update")
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}
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return ctrl.Result{}, err
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}
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// We requeue in order to clean up old runner replica sets later.
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// Otherwise, they aren't cleaned up until the next re-sync interval.
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return ctrl.Result{RequeueAfter: 5 * time.Second}, nil
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}
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const defaultReplicas = 1
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var replicasOfLiveStatefulSet *int
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if liveStatefulSet.Spec.Replicas != nil {
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v := int(*liveStatefulSet.Spec.Replicas)
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replicasOfLiveStatefulSet = &v
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}
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var replicasOfDesiredStatefulSet *int
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if desiredStatefulSet.Spec.Replicas != nil {
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v := int(*desiredStatefulSet.Spec.Replicas)
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replicasOfDesiredStatefulSet = &v
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}
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currentDesiredReplicas := getIntOrDefault(replicasOfLiveStatefulSet, defaultReplicas)
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newDesiredReplicas := getIntOrDefault(replicasOfDesiredStatefulSet, defaultReplicas)
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// Please add more conditions that we can in-place update the newest runnerreplicaset without disruption
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if currentDesiredReplicas != newDesiredReplicas {
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v := int32(newDesiredReplicas)
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updated := liveStatefulSet.DeepCopy()
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updated.Spec.Replicas = &v
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if err := r.Client.Patch(ctx, updated, client.MergeFrom(liveStatefulSet)); err != nil {
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log.Error(err, "Failed to update statefulset")
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return ctrl.Result{}, err
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}
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return ctrl.Result{}, nil
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}
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statusReplicas := int(liveStatefulSet.Status.Replicas)
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statusReadyReplicas := int(liveStatefulSet.Status.ReadyReplicas)
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totalCurrentReplicas := int(liveStatefulSet.Status.CurrentReplicas)
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updatedReplicas := int(liveStatefulSet.Status.UpdatedReplicas)
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status := runnerSet.Status.DeepCopy()
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status.CurrentReplicas = &totalCurrentReplicas
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status.ReadyReplicas = &statusReadyReplicas
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status.DesiredReplicas = &newDesiredReplicas
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status.Replicas = &statusReplicas
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status.UpdatedReplicas = &updatedReplicas
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if !reflect.DeepEqual(runnerSet.Status, status) {
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updated := runnerSet.DeepCopy()
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updated.Status = *status
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if err := r.Status().Patch(ctx, updated, client.MergeFrom(runnerSet)); err != nil {
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log.Info("Failed to patch runnerset status. Retrying immediately", "error", err.Error())
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return ctrl.Result{
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Requeue: true,
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}, nil
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}
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}
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return ctrl.Result{}, nil
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}
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func getStatefulSetTemplateHash(rs *appsv1.StatefulSet) (string, bool) {
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hash, ok := rs.Labels[LabelKeyRunnerTemplateHash]
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return hash, ok
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}
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func getRunnerSetSelector(runnerSet *v1alpha1.RunnerSet) *metav1.LabelSelector {
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selector := runnerSet.Spec.Selector
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if selector == nil {
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selector = &metav1.LabelSelector{MatchLabels: map[string]string{LabelKeyRunnerSetName: runnerSet.Name}}
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}
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return selector
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}
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var LabelKeyPodMutation = "actions-runner-controller/inject-registration-token"
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var LabelValuePodMutation = "true"
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func (r *RunnerSetReconciler) newStatefulSet(runnerSet *v1alpha1.RunnerSet) (*appsv1.StatefulSet, error) {
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runnerSetWithOverrides := *runnerSet.Spec.DeepCopy()
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for _, l := range r.CommonRunnerLabels {
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runnerSetWithOverrides.Labels = append(runnerSetWithOverrides.Labels, l)
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}
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// This label selector is used by default when rd.Spec.Selector is empty.
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runnerSetWithOverrides.Template.ObjectMeta.Labels = CloneAndAddLabel(runnerSetWithOverrides.Template.ObjectMeta.Labels, LabelKeyRunnerSetName, runnerSet.Name)
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runnerSetWithOverrides.Template.ObjectMeta.Labels = CloneAndAddLabel(runnerSetWithOverrides.Template.ObjectMeta.Labels, LabelKeyPodMutation, LabelValuePodMutation)
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template := corev1.Pod{
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ObjectMeta: runnerSetWithOverrides.StatefulSetSpec.Template.ObjectMeta,
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Spec: runnerSetWithOverrides.StatefulSetSpec.Template.Spec,
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}
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pod, err := newRunnerPod(template, runnerSet.Spec.RunnerConfig, r.RunnerImage, r.DockerImage, r.DockerRegistryMirror, r.GitHubBaseURL, false)
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if err != nil {
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return nil, err
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}
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runnerSetWithOverrides.StatefulSetSpec.Template.ObjectMeta = pod.ObjectMeta
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runnerSetWithOverrides.StatefulSetSpec.Template.Spec = pod.Spec
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// NOTE: Seems like the only supported restart policy for statefulset is "Always"?
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// I got errosr like the below when tried to use "OnFailure":
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// StatefulSet.apps \"example-runnersetpg9rx\" is invalid: [spec.template.metadata.labels: Invalid value: map[string]string{\"runner-template-hash\"
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// :\"85d7578bd6\", \"runnerset-name\":\"example-runnerset\"}: `selector` does not match template `labels`, spec.
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// template.spec.restartPolicy: Unsupported value: \"OnFailure\": supported values: \"Always\"]
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runnerSetWithOverrides.StatefulSetSpec.Template.Spec.RestartPolicy = corev1.RestartPolicyAlways
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templateHash := ComputeHash(pod.Spec)
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// Add template hash label to selector.
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runnerSetWithOverrides.Template.ObjectMeta.Labels = CloneAndAddLabel(runnerSetWithOverrides.Template.ObjectMeta.Labels, LabelKeyRunnerTemplateHash, templateHash)
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selector := getRunnerSetSelector(runnerSet)
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selector = CloneSelectorAndAddLabel(selector, LabelKeyRunnerTemplateHash, templateHash)
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selector = CloneSelectorAndAddLabel(selector, LabelKeyRunnerSetName, runnerSet.Name)
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selector = CloneSelectorAndAddLabel(selector, LabelKeyPodMutation, LabelValuePodMutation)
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runnerSetWithOverrides.StatefulSetSpec.Selector = selector
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rs := appsv1.StatefulSet{
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TypeMeta: metav1.TypeMeta{},
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ObjectMeta: metav1.ObjectMeta{
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Name: runnerSet.ObjectMeta.Name,
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Namespace: runnerSet.ObjectMeta.Namespace,
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Labels: CloneAndAddLabel(runnerSet.ObjectMeta.Labels, LabelKeyRunnerTemplateHash, templateHash),
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},
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Spec: runnerSetWithOverrides.StatefulSetSpec,
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}
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if err := ctrl.SetControllerReference(runnerSet, &rs, r.Scheme); err != nil {
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return &rs, err
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}
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return &rs, nil
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}
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func (r *RunnerSetReconciler) SetupWithManager(mgr ctrl.Manager) error {
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name := "runnerset-controller"
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if r.Name != "" {
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name = r.Name
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}
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r.Recorder = mgr.GetEventRecorderFor(name)
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return ctrl.NewControllerManagedBy(mgr).
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For(&v1alpha1.RunnerSet{}).
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Owns(&appsv1.StatefulSet{}).
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Named(name).
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Complete(r)
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}
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