/
hadoopservice_controller.go
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/
hadoopservice_controller.go
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package hadoopservice
import (
"context"
alicek106v1alpha1 "hadoop-operator/pkg/apis/alicek106/v1alpha1"
"math/rand"
"strconv"
"time"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/intstr"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
"sigs.k8s.io/controller-runtime/pkg/source"
)
var log = logf.Log.WithName("controller_hadoopservice")
/**
* USER ACTION REQUIRED: This is a scaffold file intended for the user to modify with their own Controller
* business logic. Delete these comments after modifying this file.*
*/
// Add creates a new HadoopService Controller and adds it to the Manager. The Manager will set fields on the Controller
// and Start it when the Manager is Started.
func Add(mgr manager.Manager) error {
return add(mgr, newReconciler(mgr))
}
// newReconciler returns a new reconcile.Reconciler
func newReconciler(mgr manager.Manager) reconcile.Reconciler {
return &ReconcileHadoopService{client: mgr.GetClient(), scheme: mgr.GetScheme()}
}
// add adds a new Controller to mgr with r as the reconcile.Reconciler
func add(mgr manager.Manager, r reconcile.Reconciler) error {
// Create a new controller
c, err := controller.New("hadoopservice-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource HadoopService
err = c.Watch(&source.Kind{Type: &alicek106v1alpha1.HadoopService{}}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
// TODO(user): Modify this to be the types you create that are owned by the primary resource
// Watch for changes to secondary resource Pods and requeue the owner HadoopService
err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
IsController: true,
OwnerType: &alicek106v1alpha1.HadoopService{},
})
if err != nil {
return err
}
return nil
}
// blank assignment to verify that ReconcileHadoopService implements reconcile.Reconciler
var _ reconcile.Reconciler = &ReconcileHadoopService{}
// ReconcileHadoopService reconciles a HadoopService object
type ReconcileHadoopService struct {
// This client, initialized using mgr.Client() above, is a split client
// that reads objects from the cache and writes to the apiserver
client client.Client
scheme *runtime.Scheme
}
// Reconcile reads that state of the cluster for a HadoopService object and makes changes based on the state read
// and what is in the HadoopService.Spec
// TODO(user): Modify this Reconcile function to implement your Controller logic. This example creates
// a Pod as an example
// Note:
// The Controller will requeue the Request to be processed again if the returned error is non-nil or
// Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
func (r *ReconcileHadoopService) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
reqLogger.Info("Reconciling HadoopService")
// Fetch the HadoopService instance
instance := &alicek106v1alpha1.HadoopService{}
err := r.client.Get(context.TODO(), request.NamespacedName, instance)
if err != nil {
if errors.IsNotFound(err) {
// Request object not found, could have been deleted after reconcile request.
// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
// Return and don't requeue
reqLogger.Info("HadoopService resource not found. Ignoring since object must be deleted.")
return reconcile.Result{}, nil
}
// Error reading the object - requeue the request.
reqLogger.Error(err, "Failed to get HadoopService.")
return reconcile.Result{}, err
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Create Slave StatefulSet and Service, Secret
slaveFound := &appsv1.StatefulSet{}
err = r.client.Get(context.TODO(), types.NamespacedName{Name: instance.Name + "-hadoop-slave", Namespace: instance.Namespace}, slaveFound)
if err != nil && errors.IsNotFound(err) {
// 1. Define a new StatefulSet for slaves
slaveStatefulset := r.statefulSetForSlave(instance)
reqLogger.Info("Creating a new statefulset and services.", "StatefulSet.Namespace", slaveStatefulset.Namespace, "StatefulSet.Name", slaveStatefulset.Name)
err = r.client.Create(context.TODO(), slaveStatefulset)
if err != nil {
reqLogger.Error(err, "Failed to create new StatefulSet for slaves.", "StatefulSet.Namespace", slaveStatefulset.Namespace, "StatefulSet.Name", slaveStatefulset.Name)
return reconcile.Result{}, err
}
// 2. Define a new Headless Service for slaves
slaveService := r.serviceForSlave(instance)
err = r.client.Create(context.TODO(), slaveService)
if err != nil {
reqLogger.Error(err, "Failed to create new Service for slaves.", "Service.Namespace", slaveService.Namespace, "Service.Name", slaveService.Name)
return reconcile.Result{}, err
}
// 3. Define a new Secret for master (SSH access password)
passwordGen := randomString(4)
log.Info("Generated password is " + passwordGen)
masterSecret := r.secretForSlave(instance, passwordGen)
err = r.client.Create(context.TODO(), masterSecret)
if err != nil {
reqLogger.Error(err, "Failed to create new secret for master.", "Secret.Namespace", masterSecret.Namespace, "Secret.Name", masterSecret.Name)
return reconcile.Result{}, err
}
// 4. Define a new StatefulSet for master
masterStatefulset := r.statefulSetForMaster(instance)
err = r.client.Create(context.TODO(), masterStatefulset)
if err != nil {
reqLogger.Error(err, "Failed to create new StatefulSet for master.", "StatefulSet.Namespace", masterStatefulset.Namespace, "StatefulSet.Name", masterStatefulset.Name)
return reconcile.Result{}, err
}
// 5. Define a new Headless Service for master
masterService := r.serviceForMaster(instance)
err = r.client.Create(context.TODO(), masterService)
if err != nil {
reqLogger.Error(err, "Failed to create new Service for master.", "Service.Namespace", masterService.Namespace, "Service.Name", slaveService.Name)
return reconcile.Result{}, err
}
// 6. Define a new external Service for master
masterExternalService := r.externalServiceForMaster(instance)
err = r.client.Create(context.TODO(), masterExternalService)
if err != nil {
reqLogger.Error(err, "Failed to create new Service for master.", "Service.Namespace", masterExternalService.Namespace, "Service.Name", masterExternalService.Name)
return reconcile.Result{}, err
}
// All resources are created successfully - return and requeue
return reconcile.Result{Requeue: true}, nil
} else if err != nil {
reqLogger.Error(err, "Failed to get StatefulSet for slaves.")
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
// Reference : https://github.com/kubernetes/kubernetes/blob/master/test/e2e/framework/service_util.go
func (r *ReconcileHadoopService) serviceForSlave(h *alicek106v1alpha1.HadoopService) *corev1.Service {
slaveServiceName := h.Name + "-hadoop-slave-svc"
service := &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: slaveServiceName,
Namespace: h.Namespace,
},
Spec: corev1.ServiceSpec{
Ports: []corev1.ServicePort{{
Name: "ssh",
Port: 22,
}},
ClusterIP: "None",
Selector: labelsForHadoopSlave(h.Name),
},
}
// Register HadoopService instance as the owner and controller of slaves service
controllerutil.SetControllerReference(h, service, r.scheme)
return service
}
func (r *ReconcileHadoopService) statefulSetForSlave(h *alicek106v1alpha1.HadoopService) *appsv1.StatefulSet {
ls := labelsForHadoopSlave(h.Name)
replicas := h.Spec.ClusterSize
slaveServiceName := h.Name + "-hadoop-slave-svc"
slaveStatefulsetName := h.Name + "-hadoop-slave"
masterServiceName := h.Name + "-hadoop-master-svc"
masterEndpoint := h.Name + "-hadoop-master-0." + masterServiceName + "." + h.Namespace + ".svc.cluster.local"
// masterEndpoint example : hadoop-master-0.hadoop-master-svc.default.svc.cluster.local
statefulset := &appsv1.StatefulSet{
ObjectMeta: metav1.ObjectMeta{
Name: slaveStatefulsetName,
Namespace: h.Namespace,
Labels: ls,
},
Spec: appsv1.StatefulSetSpec{
PodManagementPolicy: appsv1.ParallelPodManagement,
Replicas: &replicas,
ServiceName: slaveServiceName,
Selector: &metav1.LabelSelector{
MatchLabels: ls,
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: ls,
},
Spec: corev1.PodSpec{
Containers: []corev1.Container{{
ImagePullPolicy: corev1.PullAlways,
Image: "alicek106/hadoop:2.6.0-k8s-slave",
Name: "hadoop-slave",
Ports: []corev1.ContainerPort{{
ContainerPort: 22,
Name: "ssh",
}},
Env: []corev1.EnvVar{{
Name: "MASTER_ENDPOINT",
Value: masterEndpoint,
}},
}},
},
},
},
}
// Register HadoopService instance as the owner and controller of slaves StatefulSet
controllerutil.SetControllerReference(h, statefulset, r.scheme)
return statefulset
}
func (r *ReconcileHadoopService) secretForSlave(h *alicek106v1alpha1.HadoopService, password string) *corev1.Secret {
masterSecretName := h.Name + "-hadoop-master-secret"
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: masterSecretName,
Namespace: h.Namespace,
},
Data: map[string][]byte{
"password": []byte(password),
},
Type: "Opaque",
}
// Register HadoopService instance as the owner and controller of slaves service
controllerutil.SetControllerReference(h, secret, r.scheme)
return secret
}
func (r *ReconcileHadoopService) serviceForMaster(h *alicek106v1alpha1.HadoopService) *corev1.Service {
masterServiceName := h.Name + "-hadoop-master-svc"
service := &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: masterServiceName,
Namespace: h.Namespace,
},
Spec: corev1.ServiceSpec{
ClusterIP: "None",
Selector: labelsForHadoopMaster(h.Name),
},
}
// Register HadoopService instance as the owner and controller of slaves service
controllerutil.SetControllerReference(h, service, r.scheme)
return service
}
func (r *ReconcileHadoopService) statefulSetForMaster(h *alicek106v1alpha1.HadoopService) *appsv1.StatefulSet {
ls := labelsForHadoopMaster(h.Name)
var replicas int32 = 1
masterSecretName := h.Name + "-hadoop-master-secret"
slaveServiceName := h.Name + "-hadoop-slave-svc"
slaveStatefulsetName := h.Name + "-hadoop-slave"
masterName := h.Name + "-hadoop-master"
masterServiceName := h.Name + "-hadoop-master-svc"
masterEndpoint := h.Name + "-hadoop-master-0." + masterServiceName + "." + h.Namespace + ".svc.cluster.local"
slaveCount := int(h.Spec.ClusterSize - 1)
statefulset := &appsv1.StatefulSet{
ObjectMeta: metav1.ObjectMeta{
Name: masterName,
Namespace: h.Namespace,
Labels: ls,
},
Spec: appsv1.StatefulSetSpec{
PodManagementPolicy: appsv1.ParallelPodManagement,
Replicas: &replicas,
ServiceName: masterServiceName,
Selector: &metav1.LabelSelector{
MatchLabels: ls,
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: ls,
},
Spec: corev1.PodSpec{
Volumes: []corev1.Volume{{
Name: masterSecretName,
VolumeSource: corev1.VolumeSource{
Secret: &corev1.SecretVolumeSource{SecretName: masterSecretName},
},
}},
Containers: []corev1.Container{{
ImagePullPolicy: corev1.PullAlways,
Image: "alicek106/hadoop:2.6.0-k8s-master",
Name: "hadoop-master",
ReadinessProbe: &corev1.Probe{
Handler: corev1.Handler{
TCPSocket: &corev1.TCPSocketAction{Port: intstr.FromInt(50070)}, // hadoop dashboard port
},
InitialDelaySeconds: 5,
PeriodSeconds: 2,
},
Ports: []corev1.ContainerPort{
{ContainerPort: 22, Name: "ssh"},
{ContainerPort: 50070, Name: "dashboard"},
{ContainerPort: 8088, Name: "yarn"},
},
Env: []corev1.EnvVar{
{Name: "MASTER_ENDPOINT", Value: masterEndpoint},
{Name: "SLAVES_SVC_NAME", Value: slaveServiceName},
{Name: "SLAVES_SS_NAME", Value: slaveStatefulsetName},
{Name: "SLAVES_COUNT", Value: strconv.Itoa(slaveCount)},
{Name: "NAMESPACE", Value: h.Namespace},
},
VolumeMounts: []corev1.VolumeMount{{
Name: masterSecretName,
MountPath: "/etc/rootpwd",
ReadOnly: true,
}},
}},
},
},
},
}
// Register HadoopService instance as the owner and controller of slaves StatefulSet
controllerutil.SetControllerReference(h, statefulset, r.scheme)
return statefulset
}
func (r *ReconcileHadoopService) externalServiceForMaster(h *alicek106v1alpha1.HadoopService) *corev1.Service {
masterServiceName := h.Name + "-hadoop-master-svc-external"
service := &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: masterServiceName,
Namespace: h.Namespace,
},
Spec: corev1.ServiceSpec{
Type: corev1.ServiceTypeNodePort,
Ports: []corev1.ServicePort{
{Name: "ssh", Port: 22},
{Name: "yarn", Port: 8088},
{Name: "dashboard", Port: 50070},
},
Selector: labelsForHadoopMaster(h.Name),
},
}
// Register HadoopService instance as the owner and controller of slaves service
controllerutil.SetControllerReference(h, service, r.scheme)
return service
}
// labelsForHadoopService returns the labels for selecting the resources
// belonging to the given HadoopService custom resource.
func labelsForHadoopSlave(name string) map[string]string {
return map[string]string{"app": "hadoopservice", "hadoop_cr": name, "role": "slave"}
}
func labelsForHadoopMaster(name string) map[string]string {
return map[string]string{"app": "hadoopservice", "hadoop_cr": name, "role": "master"}
}
func randomString(len int) string {
bytes := make([]byte, len)
rand.Seed(time.Now().UTC().UnixNano())
for i := 0; i < len; i++ {
bytes[i] = byte(65 + rand.Intn(25)) //A=65 and Z = 65+25
}
return string(bytes)
}