/
controller.go
550 lines (468 loc) · 19.8 KB
/
controller.go
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/*
Copyright 2016 The Rook Authors. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package cluster to manage a Ceph cluster.
package cluster
import (
"fmt"
"os"
"reflect"
"time"
"github.com/coreos/pkg/capnslog"
opkit "github.com/rook/operator-kit"
cephv1beta1 "github.com/rook/rook/pkg/apis/ceph.rook.io/v1beta1"
rookv1alpha1 "github.com/rook/rook/pkg/apis/rook.io/v1alpha1"
"github.com/rook/rook/pkg/clusterd"
"github.com/rook/rook/pkg/daemon/ceph/agent/flexvolume/attachment"
"github.com/rook/rook/pkg/operator/ceph/cluster/mon"
"github.com/rook/rook/pkg/operator/ceph/cluster/osd"
"github.com/rook/rook/pkg/operator/ceph/file"
"github.com/rook/rook/pkg/operator/ceph/object"
"github.com/rook/rook/pkg/operator/ceph/pool"
"github.com/rook/rook/pkg/operator/discover"
"github.com/rook/rook/pkg/operator/k8sutil"
apiextensionsv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
)
const (
CustomResourceName = "cluster"
CustomResourceNamePlural = "clusters"
crushConfigMapName = "rook-crush-config"
crushmapCreatedKey = "initialCrushMapCreated"
clusterCreateInterval = 6 * time.Second
clusterCreateTimeout = 5 * time.Minute
updateClusterInterval = 30 * time.Second
updateClusterTimeout = 1 * time.Hour
)
const (
// DefaultClusterName states the default name of the rook-cluster if not provided.
DefaultClusterName = "rook"
clusterDeleteRetryInterval = 2 //seconds
clusterDeleteMaxRetries = 15
)
var (
logger = capnslog.NewPackageLogger("github.com/rook/rook", "op-cluster")
finalizerName = fmt.Sprintf("%s.%s", ClusterResource.Name, ClusterResource.Group)
finalizerNameRookLegacy = fmt.Sprintf("%s.%s", ClusterResourceRookLegacy.Name, ClusterResourceRookLegacy.Group)
)
var ClusterResource = opkit.CustomResource{
Name: CustomResourceName,
Plural: CustomResourceNamePlural,
Group: cephv1beta1.CustomResourceGroup,
Version: cephv1beta1.Version,
Scope: apiextensionsv1beta1.NamespaceScoped,
Kind: reflect.TypeOf(cephv1beta1.Cluster{}).Name(),
}
var ClusterResourceRookLegacy = opkit.CustomResource{
Name: CustomResourceName,
Plural: CustomResourceNamePlural,
Group: rookv1alpha1.CustomResourceGroup,
Version: rookv1alpha1.Version,
Scope: apiextensionsv1beta1.NamespaceScoped,
Kind: reflect.TypeOf(rookv1alpha1.Cluster{}).Name(),
}
// ClusterController controls an instance of a Rook cluster
type ClusterController struct {
context *clusterd.Context
volumeAttachment attachment.Attachment
devicesInUse bool
rookImage string
clusterMap map[string]*cluster
}
// NewClusterController create controller for watching cluster custom resources created
func NewClusterController(context *clusterd.Context, rookImage string, volumeAttachment attachment.Attachment) *ClusterController {
return &ClusterController{
context: context,
volumeAttachment: volumeAttachment,
rookImage: rookImage,
clusterMap: make(map[string]*cluster),
}
}
// Watch watches instances of cluster resources
func (c *ClusterController) StartWatch(namespace string, stopCh chan struct{}) error {
resourceHandlerFuncs := cache.ResourceEventHandlerFuncs{
AddFunc: c.onAdd,
UpdateFunc: c.onUpdate,
DeleteFunc: c.onDelete,
}
logger.Infof("start watching clusters in all namespaces")
watcher := opkit.NewWatcher(ClusterResource, namespace, resourceHandlerFuncs, c.context.RookClientset.CephV1beta1().RESTClient())
go watcher.Watch(&cephv1beta1.Cluster{}, stopCh)
// watch for events on all legacy types too
c.watchLegacyClusters(namespace, stopCh, resourceHandlerFuncs)
return nil
}
func (c *ClusterController) StopWatch() {
for _, cluster := range c.clusterMap {
close(cluster.stopCh)
}
c.clusterMap = make(map[string]*cluster)
}
// ************************************************************************************************
// Add event functions
// ************************************************************************************************
func (c *ClusterController) onAdd(obj interface{}) {
clusterObj, migrationNeeded, err := getClusterObject(obj)
if err != nil {
logger.Errorf("failed to get cluster object: %+v", err)
return
}
if migrationNeeded {
err = c.migrateClusterObject(clusterObj, obj)
if err != nil {
logger.Errorf("failed to migrate legacy cluster %s in namespace %s: %+v", clusterObj.Name, clusterObj.Namespace, err)
}
// no matter the outcome of the migration, bail out now. if it was successful, then we'll be getting
// another event for the migrated object and we'll just handle it there.
return
}
cluster := newCluster(clusterObj, c.context)
c.clusterMap[cluster.Namespace] = cluster
logger.Infof("starting cluster in namespace %s", cluster.Namespace)
if c.devicesInUse && cluster.Spec.Storage.AnyUseAllDevices() {
message := "using all devices in more than one namespace not supported"
logger.Error(message)
if err := c.updateClusterStatus(clusterObj.Namespace, clusterObj.Name, cephv1beta1.ClusterStateError, message); err != nil {
logger.Errorf("failed to update cluster status in namespace %s: %+v", cluster.Namespace, err)
}
return
}
if cluster.Spec.Storage.AnyUseAllDevices() {
c.devicesInUse = true
}
if cluster.Spec.Mon.Count <= 0 {
logger.Warningf("mon count is 0 or less, should be at least 1, will use default value of %d", mon.DefaultMonCount)
cluster.Spec.Mon.Count = mon.DefaultMonCount
cluster.Spec.Mon.AllowMultiplePerNode = true
}
if cluster.Spec.Mon.Count > mon.MaxMonCount {
logger.Warningf("mon count is bigger than %d (given: %d), not supported, changing to %d", mon.MaxMonCount, cluster.Spec.Mon.Count, mon.MaxMonCount)
cluster.Spec.Mon.Count = mon.MaxMonCount
}
if cluster.Spec.Mon.Count%2 == 0 {
logger.Warningf("mon count is even (given: %d), should be uneven, continuing", cluster.Spec.Mon.Count)
}
// Start the Rook cluster components. Retry several times in case of failure.
err = wait.Poll(clusterCreateInterval, clusterCreateTimeout, func() (bool, error) {
if err := c.updateClusterStatus(clusterObj.Namespace, clusterObj.Name, cephv1beta1.ClusterStateCreating, ""); err != nil {
logger.Errorf("failed to update cluster status in namespace %s: %+v", cluster.Namespace, err)
return false, nil
}
err := cluster.createInstance(c.rookImage)
if err != nil {
logger.Errorf("failed to create cluster in namespace %s. %+v", cluster.Namespace, err)
return false, nil
}
// cluster is created, update the cluster CRD status now
if err := c.updateClusterStatus(clusterObj.Namespace, clusterObj.Name, cephv1beta1.ClusterStateCreated, ""); err != nil {
logger.Errorf("failed to update cluster status in namespace %s: %+v", cluster.Namespace, err)
return false, nil
}
return true, nil
})
if err != nil {
message := fmt.Sprintf("giving up creating cluster in namespace %s after %s", cluster.Namespace, clusterCreateTimeout)
logger.Error(message)
if err := c.updateClusterStatus(clusterObj.Namespace, clusterObj.Name, cephv1beta1.ClusterStateError, message); err != nil {
logger.Errorf("failed to update cluster status in namespace %s: %+v", cluster.Namespace, err)
}
return
}
// Start pool CRD watcher
poolController := pool.NewPoolController(c.context)
poolController.StartWatch(cluster.Namespace, cluster.stopCh)
// Start object store CRD watcher
objectStoreController := object.NewObjectStoreController(c.context, c.rookImage, cluster.Spec.Network.HostNetwork, cluster.ownerRef)
objectStoreController.StartWatch(cluster.Namespace, cluster.stopCh)
// Start file system CRD watcher
fileController := file.NewFilesystemController(c.context, c.rookImage, cluster.Spec.Network.HostNetwork, cluster.ownerRef)
fileController.StartWatch(cluster.Namespace, cluster.stopCh)
// Start mon health checker
healthChecker := mon.NewHealthChecker(cluster.mons)
go healthChecker.Check(cluster.stopCh)
// Start the osd health checker
osdChecker := osd.NewMonitor(c.context, cluster.Namespace)
go osdChecker.Start(cluster.stopCh)
// add the finalizer to the crd
err = c.addFinalizer(clusterObj)
if err != nil {
logger.Errorf("failed to add finalizer to cluster crd. %+v", err)
}
}
// ************************************************************************************************
// Update event functions
// ************************************************************************************************
func (c *ClusterController) onUpdate(oldObj, newObj interface{}) {
oldClust, _, err := getClusterObject(oldObj)
if err != nil {
logger.Errorf("failed to get old cluster object: %+v", err)
return
}
newClust, migrationNeeded, err := getClusterObject(newObj)
if err != nil {
logger.Errorf("failed to get new cluster object: %+v", err)
return
}
if migrationNeeded {
logger.Infof("update event for legacy cluster %s", newClust.Namespace)
if isLegacyClusterObjectDeleted(newObj) {
// the legacy cluster object has been requested to be deleted but the finalizer is preventing
// that. Let's remove the finalizer and allow the deletion of the legacy object to proceed.
c.removeFinalizer(newObj)
return
}
if err = c.migrateClusterObject(newClust, newObj); err != nil {
logger.Errorf("failed to migrate legacy cluster %s in namespace %s: %+v", newClust.Name, newClust.Namespace, err)
}
// no matter the outcome of the migration, bail out now. if it was successful, then we'll be getting
// another event for the migrated object and we'll just handle it there.
return
}
logger.Infof("update event for cluster %s", newClust.Namespace)
// Check if the cluster is being deleted. This code path is called when a finalizer is specified in the crd.
// When a cluster is requested for deletion, K8s will only set the deletion timestamp if there are any finalizers in the list.
// K8s will only delete the crd and child resources when the finalizers have been removed from the crd.
if newClust.DeletionTimestamp != nil {
logger.Infof("cluster %s has a deletion timestamp", newClust.Namespace)
err := c.handleDelete(newClust, time.Duration(clusterDeleteRetryInterval)*time.Second)
if err != nil {
logger.Errorf("failed finalizer for cluster. %+v", err)
return
}
// remove the finalizer from the crd, which indicates to k8s that the resource can safely be deleted
c.removeFinalizer(newClust)
return
}
if !clusterChanged(oldClust.Spec, newClust.Spec) {
logger.Infof("update event for cluster %s is not supported", newClust.Namespace)
return
}
logger.Infof("update event for cluster %s is supported, orchestrating update now", newClust.Namespace)
logger.Debugf("old cluster: %+v", oldClust.Spec)
logger.Debugf("new cluster: %+v", newClust.Spec)
cluster, ok := c.clusterMap[newClust.Namespace]
if !ok {
logger.Errorf("Cannot update cluster %s that does not exist", newClust.Namespace)
return
}
cluster.Spec = &newClust.Spec
// attempt to update the cluster. note this is done outside of wait.Poll because that function
// will wait for the retry interval before trying for the first time.
done, _ := c.handleUpdate(newClust, cluster)
if done {
return
}
err = wait.Poll(updateClusterInterval, updateClusterTimeout, func() (bool, error) {
return c.handleUpdate(newClust, cluster)
})
if err != nil {
message := fmt.Sprintf("giving up trying to update cluster in namespace %s after %s", cluster.Namespace, updateClusterTimeout)
logger.Error(message)
if err := c.updateClusterStatus(newClust.Namespace, newClust.Name, cephv1beta1.ClusterStateError, message); err != nil {
logger.Errorf("failed to update cluster status in namespace %s: %+v", newClust.Namespace, err)
}
return
}
}
func (c *ClusterController) handleUpdate(newClust *cephv1beta1.Cluster, cluster *cluster) (bool, error) {
if err := c.updateClusterStatus(newClust.Namespace, newClust.Name, cephv1beta1.ClusterStateUpdating, ""); err != nil {
logger.Errorf("failed to update cluster status in namespace %s: %+v", newClust.Namespace, err)
return false, nil
}
if err := cluster.createInstance(c.rookImage); err != nil {
logger.Errorf("failed to update cluster in namespace %s. %+v", newClust.Namespace, err)
return false, nil
}
if err := c.updateClusterStatus(newClust.Namespace, newClust.Name, cephv1beta1.ClusterStateCreated, ""); err != nil {
logger.Errorf("failed to update cluster status in namespace %s: %+v", newClust.Namespace, err)
return false, nil
}
logger.Infof("succeeded updating cluster in namespace %s", newClust.Namespace)
return true, nil
}
// ************************************************************************************************
// Delete event functions
// ************************************************************************************************
func (c *ClusterController) onDelete(obj interface{}) {
clust, migrationNeeded, err := getClusterObject(obj)
if err != nil {
logger.Errorf("failed to get cluster object: %+v", err)
return
}
if migrationNeeded {
// ignore deletion of a legacy cluster as it should have been migrated to an object of the current type
// and tracked now with that object.
logger.Infof("ignoring deletion of legacy cluster %s in namespace %s", clust.Name, clust.Namespace)
return
}
logger.Infof("delete event for cluster %s in namespace %s", clust.Name, clust.Namespace)
err = c.handleDelete(clust, time.Duration(clusterDeleteRetryInterval)*time.Second)
if err != nil {
logger.Errorf("failed to delete cluster. %+v", err)
}
if cluster, ok := c.clusterMap[clust.Namespace]; ok {
close(cluster.stopCh)
delete(c.clusterMap, clust.Namespace)
}
if clust.Spec.Storage.AnyUseAllDevices() {
c.devicesInUse = false
}
discover.FreeDevicesByCluster(c.context, clust.Namespace)
}
func (c *ClusterController) handleDelete(cluster *cephv1beta1.Cluster, retryInterval time.Duration) error {
operatorNamespace := os.Getenv(k8sutil.PodNamespaceEnvVar)
retryCount := 0
for {
// TODO: filter this List operation by cluster namespace on the server side
vols, err := c.volumeAttachment.List(operatorNamespace)
if err != nil {
return fmt.Errorf("failed to get volume attachments for operator namespace %s: %+v", operatorNamespace, err)
}
// find volume attachments in the deleted cluster
attachmentsExist := false
AttachmentLoop:
for _, vol := range vols.Items {
for _, a := range vol.Attachments {
if a.ClusterName == cluster.Namespace {
// there is still an outstanding volume attachment in the cluster that is being deleted.
attachmentsExist = true
break AttachmentLoop
}
}
}
if !attachmentsExist {
logger.Infof("no volume attachments for cluster %s to clean up.", cluster.Namespace)
break
}
retryCount++
if retryCount == clusterDeleteMaxRetries {
logger.Warningf(
"exceeded retry count while waiting for volume attachments for cluster %s to be cleaned up. vols: %+v",
cluster.Namespace,
vols.Items)
break
}
logger.Infof("waiting for volume attachments in cluster %s to be cleaned up. Retrying in %s.",
cluster.Namespace, retryInterval)
<-time.After(retryInterval)
}
return nil
}
func isLegacyClusterObjectDeleted(obj interface{}) bool {
// if the object is a legacy cluster type and the deletion timestamp on the legacy cluster object is set,
// it has been requested to be deleted
if clusterLegacy, ok := obj.(*rookv1alpha1.Cluster); ok {
return clusterLegacy.DeletionTimestamp != nil
}
// not a legacy type
return false
}
// ************************************************************************************************
// Finalizer functions
// ************************************************************************************************
func (c *ClusterController) addFinalizer(clust *cephv1beta1.Cluster) error {
// get the latest cluster object since we probably updated it before we got to this point (e.g. by updating its status)
clust, err := c.context.RookClientset.CephV1beta1().Clusters(clust.Namespace).Get(clust.Name, metav1.GetOptions{})
if err != nil {
return err
}
// add the finalizer (cluster.ceph.rook.io) if it is not yet defined on the cluster CRD
for _, finalizer := range clust.Finalizers {
if finalizer == finalizerName {
logger.Infof("finalizer already set on cluster %s", clust.Namespace)
return nil
}
}
// adding finalizer to the cluster crd
clust.Finalizers = append(clust.Finalizers, finalizerName)
// update the crd
_, err = c.context.RookClientset.CephV1beta1().Clusters(clust.Namespace).Update(clust)
if err != nil {
return fmt.Errorf("failed to add finalizer to cluster. %+v", err)
}
logger.Infof("added finalizer to cluster %s", clust.Name)
return nil
}
func (c *ClusterController) removeFinalizer(obj interface{}) {
var fname string
var objectMeta *metav1.ObjectMeta
// first determine what type/version of cluster we are dealing with
if cl, ok := obj.(*cephv1beta1.Cluster); ok {
fname = finalizerName
objectMeta = &cl.ObjectMeta
} else if cl, ok := obj.(*rookv1alpha1.Cluster); ok {
fname = finalizerNameRookLegacy
objectMeta = &cl.ObjectMeta
} else {
logger.Warningf("cannot remove finalizer from object that is not a cluster: %+v", obj)
return
}
// remove the finalizer from the slice if it exists
found := false
for i, finalizer := range objectMeta.Finalizers {
if finalizer == fname {
objectMeta.Finalizers = append(objectMeta.Finalizers[:i], objectMeta.Finalizers[i+1:]...)
found = true
break
}
}
if !found {
logger.Infof("finalizer %s not found in the cluster crd '%s'", fname, objectMeta.Name)
return
}
// update the crd to remove the finalizer for good. retry several times in case of intermittent failures.
maxRetries := 5
retrySeconds := 5 * time.Second
for i := 0; i < maxRetries; i++ {
var err error
if cluster, ok := obj.(*cephv1beta1.Cluster); ok {
_, err = c.context.RookClientset.CephV1beta1().Clusters(cluster.Namespace).Update(cluster)
} else {
clusterLegacy := obj.(*rookv1alpha1.Cluster)
_, err = c.context.RookClientset.RookV1alpha1().Clusters(clusterLegacy.Namespace).Update(clusterLegacy)
}
if err != nil {
logger.Errorf("failed to remove finalizer %s from cluster %s. %+v", fname, objectMeta.Name, err)
time.Sleep(retrySeconds)
continue
}
logger.Infof("removed finalizer %s from cluster %s", fname, objectMeta.Name)
return
}
logger.Warningf("giving up from removing the %s cluster finalizer", fname)
}
func (c *ClusterController) updateClusterStatus(namespace, name string, state cephv1beta1.ClusterState, message string) error {
// get the most recent cluster CRD object
cluster, err := c.context.RookClientset.CephV1beta1().Clusters(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("failed to get cluster from namespace %s prior to updating its status: %+v", namespace, err)
}
// update the status on the retrieved cluster object
cluster.Status = cephv1beta1.ClusterStatus{State: state, Message: message}
if _, err := c.context.RookClientset.CephV1beta1().Clusters(cluster.Namespace).Update(cluster); err != nil {
return fmt.Errorf("failed to update cluster %s status: %+v", cluster.Namespace, err)
}
return nil
}
func ClusterOwnerRef(namespace, clusterID string) metav1.OwnerReference {
blockOwner := true
return metav1.OwnerReference{
APIVersion: ClusterResource.Version,
Kind: ClusterResource.Kind,
Name: namespace,
UID: types.UID(clusterID),
BlockOwnerDeletion: &blockOwner,
}
}