Let us create a kubernetes operator for a resource called NassNamespace. When this resouece is created the operator will create a new namespace. The name of the namespace will be a concatenation of the name of the namespace where the NassNamespace is created, ‘-‘, and the name of the NaasNamespace resource. Use controller-runtime
To create a Kubernetes operator for a resource called NassNamespace using controller-runtime, follow these steps:
- Install prerequisites:
- Install the Go programming language (v1.15+)
- Install Kubernetes CLI (kubectl) v1.19+
- Install the Kubernetes API extension (kubebuilder) v3.0+
- Scaffold the project using kubebuilder:
kubebuilder init --domain example.com --repo github.com/yourusername/nassnamespace-operator
- Define the NassNamespace custom resource definition (CRD):
Create a new API for the custom resource:
kubebuilder create api --group core --version v1alpha1 --kind NassNamespace
Edit the api/v1alpha1/nassnamespace_types.go file:
package v1alpha1
import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// NassNamespaceSpec defines the desired state of NassNamespace
type NassNamespaceSpec struct {
// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster
}
// NassNamespaceStatus defines the observed state of NassNamespace
type NassNamespaceStatus struct {
// INSERT ADDITIONAL STATUS FIELD - define observed state of cluster
}
//+kubebuilder:object:root=true
//+kubebuilder:subresource:status
// NassNamespace is the Schema for the nassnamespaces API
type NassNamespace struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`
Spec NassNamespaceSpec `json:"spec,omitempty"`
Status NassNamespaceStatus `json:"status,omitempty"`
}
//+kubebuilder:object:root=true
// NassNamespaceList contains a list of NassNamespace
type NassNamespaceList struct {
metav1.TypeMeta `json:",inline"`
metav1.ListMeta `json:"metadata,omitempty"`
Items []NassNamespace `json:"items"`
}
func init() {
SchemeBuilder.Register(&NassNamespace{}, &NassNamespaceList{})
}- Implement the controller logic:
Edit the controllers/nassnamespace_controller.go file:
package controllers
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
corev1alpha1 "github.com/yourusername/nassnamespace-operator/api/v1alpha1"
)
// NassNamespaceReconciler reconciles a NassNamespace object
type NassNamespaceReconciler struct {
client.Client
Scheme *runtime.Scheme
}
//+kubebuilder:rbac:groups=core.example.com,resources=nassnamespaces,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=core.example.com,resources=nassnamespaces/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=core.example.com,resources=nassnamespaces/finalizers,verbs=update
//+kubebuilder:rbac:groups="",resources=namespaces,verbs=get;list;watch;create;update;patch;delete
func (r *NassNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Retrieve the NassNamespace instance
nassNamespace := &corev1alpha1.NPlease redo step 4, it was not complete
Apologies for the incomplete response. Here is the complete step 4:
- Implement the controller logic:
Edit the controllers/nassnamespace_controller.go file:
package controllers
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
corev1alpha1 "github.com/yourusername/nassnamespace-operator/api/v1alpha1"
)
// NassNamespaceReconciler reconciles a NassNamespace object
type NassNamespaceReconciler struct {
client.Client
Scheme *runtime.Scheme
}
//+kubebuilder:rbac:groups=core.example.com,resources=nassnamespaces,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=core.example.com,resources=nassnamespaces/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=core.example.com,resources=nassnamespaces/finalizers,verbs=update
//+kubebuilder:rbac:groups="",resources=namespaces,verbs=get;list;watch;create;update;patch;delete
func (r *NassNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Retrieve the NassNamespace instance
nassNamespace := &corev1alpha1.NassNamespace{}
err := r.Get(ctx, req.NamespacedName, nassNamespace)
if err != nil {
if errors.IsNotFound(err) {
log.Info("NassNamespace not found. Ignore since object must have been deleted.")
return ctrl.Result{}, nil
}
log.Error(err, "Failed to get NassNamespace")
return ctrl.Result{}, err
}
// Define the desired Namespace object
targetNamespaceName := fmt.Sprintf("%s-%s", req.Namespace, nassNamespace.Name)
targetNamespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: targetNamespaceName,
},
}
// Check if the Namespace already exists
existingNamespace := &corev1.Namespace{}
err = r.Get(ctx, client.ObjectKey{Name: targetNamespace.Name}, existingNamespace)
if err != nil && errors.IsNotFound(err) {
// Create the Namespace
log.Info("Creating new namespace", "Namespace", targetNamespaceName)
if err := r.Create(ctx, targetNamespace); err != nil {
log.Error(err, "Failed to create namespace", "Namespace", targetNamespaceName)
return ctrl.Result{}, err
}
} else if err != nil {
log.Error(err, "Failed to get Namespace")
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}
func (r *NassNamespaceReconciler) SetupWithManager(mgr ctrl.Manager) error {
return ctrl.NewControllerManagedBy(mgr).
For(&corev1alpha1.NassNamespace{}).
Complete(r)
}- Update the generated manifests and build the operator:
make manifests
make generate
make docker-build docker-push IMG=<your-image-repo>:<your-image-tag>
- Deploy the operator to your cluster:
make deploy IMG=<your-image-repo>:<your-image-tag>
- Test the operator:
Create a NassNamespace custom resource:
Please redo step 7, it was incomplete
Apologies for the incomplete response. Here is the complete step 7:
- Test the operator:
Create a NassNamespace custom resource:
Create a file called nassnamespace-sample.yaml with the following content:
apiVersion: core.example.com/v1alpha1
kind: NassNamespace
metadata:
name: nassnamespace-sample
namespace: default
Apply the custom resource to your cluster:
kubectl apply -f nassnamespace-sample.yaml
Check if the new namespace is created:
kubectl get namespaces
You should see a new namespace named default-nassnamespace-sample in the list of namespaces. This confirms that the operator is working as expected.
To clean up the created resources:
kubectl delete -f nassnamespace-sample.yaml
kubectl delete namespace default-nassnamespace-sample
with the controllers/nassnamespace_controller.go file, modify so that if the NassNamespace resource is deleted, the controller deletes the file
To modify the controllers/nassnamespace_controller.go file to delete the created namespace when the NassNamespace resource is deleted, you need to add a finalizer to the NassNamespace resource and handle the deletion logic. Here's how to do it:
- Add a finalizer constant and update the NassNamespace struct in api/v1alpha1/nassnamespace_types.go:
const NassNamespaceFinalizer = "nassnamespace.core.example.com/finalizer"
// NassNamespace is the Schema for the nassnamespaces API
type NassNamespace struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`
Spec NassNamespaceSpec `json:"spec,omitempty"`
Status NassNamespaceStatus `json:"status,omitempty"`
}- Modify the controllers/nassnamespace_controller.go file:
func (r *NassNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Retrieve the NassNamespace instance
nassNamespace := &corev1alpha1.NassNamespace{}
err := r.Get(ctx, req.NamespacedName, nassNamespace)
if err != nil {
if errors.IsNotFound(err) {
log.Info("NassNamespace not found. Ignore since object must have been deleted.")
return ctrl.Result{}, nil
}
log.Error(err, "Failed to get NassNamespace")
return ctrl.Result{}, err
}
// Handle finalizer logic
if nassNamespace.ObjectMeta.DeletionTimestamp.IsZero() {
// Add the finalizer if it doesn't exist
if !containsString(nassNamespace.ObjectMeta.Finalizers, NassNamespaceFinalizer) {
nassNamespace.ObjectMeta.Finalizers = append(nassNamespace.ObjectMeta.Finalizers, NassNamespaceFinalizer)
if err := r.Update(ctx, nassNamespace); err != nil {
log.Error(err, "Failed to add finalizer to NassNamespace")
return ctrl.Result{}, err
}
}
} else {
// The object is being deleted
if containsString(nassNamespace.ObjectMeta.Finalizers, NassNamespaceFinalizer) {
// Delete the namespace
targetNamespaceName := fmt.Sprintf("%s-%s", req.Namespace, nassNamespace.Name)
targetNamespace := &corev1.Namespace{}
err = r.Get(ctx, client.ObjectKey{Name: targetNamespaceName}, targetNamespace)
if err != nil && !errors.IsNotFound(err) {
log.Error(err, "Failed to get namespace for deletion")
return ctrl.Result{}, err
}
if err == nil {
log.Info("Deleting namespace", "Namespace", targetNamespaceName)
if err := r.Delete(ctx, targetNamespace); err != nil {
log.Error(err, "Failed to delete namespace", "Namespace", targetNamespaceName)
return ctrl.Result{}, err
}
}
// Remove the finalizer
nassNamespace.ObjectMeta.Finalizers = removeString(nassNamespace.ObjectMeta.Finalizers, NassNamespaceFinalizer)
if err := r.Update(ctx, nassNamespace); err != nil {
log.Error(err, "Failed to remove finalizer from NassNamespace")
return ctrl.Result{}, err
}
}
return ctrl.Result{}, nil
}
// Rest of the reconcile logic
// ...
}
func containsString(slice []string, s string) bool {
for _, item := range slice {
if item == s {
return true
}
}
return false
}
func removeString(slice []string, s string) []string {
var result []q
It looks like the response was cut off. Here's the missing part of the removeString function:
func removeString(slice []string, splease show me how the Reconciler function can delete the namespace when a NassNamespace is deleted without using finalizer. I would rather have it use the following logic: if the namespace exists and the resource does not exist then delete. if the namespace does not exist and the resource exists then create.
You can implement the desired logic by slightly modifying the Reconcile function in the controllers/nassnamespace_controller.go file. Instead of using finalizers, you can simply check if the NassNamespace resource exists and if the corresponding namespace exists, then act accordingly.
Here's how the modified Reconcile function would look like:
func (r *NassNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Retrieve the NassNamespace instance
nassNamespace := &corev1alpha1.NassNamespace{}
err := r.Get(ctx, req.NamespacedName, nassNamespace)
// Define the desired Namespace object
targetNamespaceName := fmt.Sprintf("%s-%s", req.Namespace, req.Name)
targetNamespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: targetNamespaceName,
},
}
// Check if the Namespace already exists
existingNamespace := &corev1.Namespace{}
nsErr := r.Get(ctx, client.ObjectKey{Name: targetNamespace.Name}, existingNamespace)
if err != nil && errors.IsNotFound(err) {
// NassNamespace doesn't exist
if nsErr == nil {
// Namespace exists, delete it
log.Info("Deleting namespace", "Namespace", targetNamespaceName)
if err := r.Delete(ctx, existingNamespace); err != nil {
log.Error(err, "Failed to delete namespace", "Namespace", targetNamespaceName)
return ctrl.Result{}, err
}
} else if !errors.IsNotFound(nsErr) {
// Error getting the namespace
log.Error(nsErr, "Failed to get Namespace")
return ctrl.Result{}, nsErr
}
} else if err == nil {
// NassNamespace exists
if nsErr != nil && errors.IsNotFound(nsErr) {
// Namespace doesn't exist, create it
log.Info("Creating new namespace", "Namespace", targetNamespaceName)
if err := r.Create(ctx, targetNamespace); err != nil {
log.Error(err, "Failed to create namespace", "Namespace", targetNamespaceName)
return ctrl.Result{}, err
}
} else if nsErr != nil {
// Error getting the namespace
log.Error(nsErr, "Failed to get Namespace")
return ctrl.Result{}, nsErr
}
} else {
// Error getting the NassNamespace
log.Error(err, "Failed to get NassNamespace")
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}With this implementation, the controller will create the namespace if the NassNamespace resource exists and the namespace doesn't. Conversely, it will delete the namespace if the NassNamespace resource doesn't exist and the namespace does.
please add a function that checks if the resource is created in a tenant namespace. if the resource is not then it should ignore it
To add a function that checks if the NassNamespace resource is created in a tenant namespace and ignores it if not, you can add a helper function to verify the namespace and call it in the Reconcile function.
- Add the helper function isTenantNamespace:
func isTenantNamespace(namespace string) bool {
// Define the tenant namespace prefix
tenantNamespacePrefix := "tenant-"
// Check if the namespace starts with the tenant namespace prefix
return strings.HasPrefix(namespace, tenantNamespacePrefix)
}This helper function checks if the provided namespace string starts with the defined tenant namespace prefix. You can customize the prefix to fit your use case.
- Modify the Reconcile function in the controllers/nassnamespace_controller.go file to call the isTenantNamespace function:
func (r *NassNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Check if the NassNamespace is created in a tenant namespace
if !isTenantNamespace(req.Namespace) {
log.Info("Ignoring NassNamespace resource, as it is not created in a tenant namespace", "Namespace", req.Namespace)
return ctrl.Result{}, nil
}
// Rest of the Reconcile logic
// ...
}With these changes, the controller will ignore the NassNamespace resources that are not created in the tenant namespaces.
instead of looking at the name, let us do the following: if the tenant namespace has an annotation: "naas/tenant" : "true" then it is a tenant namespace. if not then it is a regular namespace
To modify the function to check if a namespace is a tenant namespace based on the presence of an annotation, you can update the isTenantNamespace function as follows:
- Update the isTenantNamespace function to accept a context and a client:
func (r *NassNamespaceReconciler) isTenantNamespace(ctx context.Context, namespace string) (bool, error) {
ns := &corev1.Namespace{}
err := r.Get(ctx, client.ObjectKey{Name: namespace}, ns)
if err != nil {
return false, err
}
tenantAnnotation, exists := ns.Annotations["naas/tenant"]
return exists && tenantAnnotation == "true", nil
}This function now fetches the namespace object based on its name and checks if the annotation "naas/tenant" with the value "true" is present.
- Modify the Reconcile function in the controllers/nassnamespace_controller.go file to call the updated isTenantNamespace function:
func (r *NassNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Check if the NassNamespace is created in a tenant namespace
isTenant, err := r.isTenantNamespace(ctx, req.Namespace)
if err != nil {
log.Error(err, "Failed to get tenant namespace information")
return ctrl.Result{}, err
}
if !isTenant {
log.Info("Ignoring NassNamespace resource, as it is not created in a tenant namespace", "Namespace", req.Namespace)
return ctrl.Result{}, nil
}
// Rest of the Reconcile logic
// ...
}With these changes, the controller will ignore the NassNamespace resources that are not created in the tenant namespaces. The tenant namespaces are determined by the presence of the "naas/tenant" annotation with the value "true".
assume the following code
It seems you didn't provide any code or context for me to assume. Please provide the code snippet or context, and I'd be happy to help you with your request.
func (r *NaasNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) { log := ctrl.LoggerFrom(ctx)
// Check if the NaasNamespace is created in a tenant namespace
isTenant, err := r.isTenantNamespace(ctx, req.Namespace)
if err != nil {
return ctrl.Result{}, err
}
if isTenant {
log.Info("Ignoring NaasNamespace resource, as it is not created in a tenant namespace", "Namespace", req.Namespace)
return ctrl.Result{}, nil
}
// Retrieve the NaasNamespace instance
nassNamespace := &corev1alpha1.NaasNamespace{}
err = r.Get(ctx, req.NamespacedName, nassNamespace)
// Define the desired Namespace object
targetNamespaceName := fmt.Sprintf("%s-%s", req.Namespace, req.Name)
targetNamespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: targetNamespaceName,
},
}
// Check if the Namespace already exists
existingNamespace := &corev1.Namespace{}
nsErr := r.Get(ctx, client.ObjectKey{Name: targetNamespace.Name}, existingNamespace)
if err != nil && errors.IsNotFound(err) {
// NassNamespace doesn't exist
if nsErr == nil {
// Namespace exists, delete it
log.Info("Deleting namespace", "Namespace", targetNamespaceName)
if err := r.Delete(ctx, existingNamespace); err != nil {
log.Error(err, "Failed to delete namespace", "Namespace", targetNamespaceName)
return ctrl.Result{}, err
}
} else if !errors.IsNotFound(nsErr) {
// Error getting the namespace
log.Error(nsErr, "Failed to get Namespace")
return ctrl.Result{}, nsErr
}
} else if err == nil {
// NaasNamespace exists
if nsErr != nil && errors.IsNotFound(nsErr) {
// Namespace doesn't exist, create it
log.Info("Creating new namespace", "Namespace", targetNamespaceName)
if err := r.Create(ctx, targetNamespace); err != nil {
log.Error(err, "Failed to create namespace", "Namespace", targetNamespaceName)
return ctrl.Result{}, err
}
} else if nsErr != nil {
// Error getting the namespace
log.Error(nsErr, "Failed to get Namespace")
return ctrl.Result{}, nsErr
}
} else {
// Error getting the NassNamespace
log.Error(err, "Failed to get NassNamespace")
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}
It appears you have pasted a Reconcile function for a NaasNamespaceReconciler struct that handles the creation and deletion of a corresponding Kubernetes namespace based on the presence or absence of a NaasNamespace custom resource. The code also checks if the NaasNamespace resource is created within a tenant namespace, and if it's not, the reconciler ignores the resource.
However, there's an issue in the code: the condition to check if the namespace is a tenant should be negated. It should ignore the resource if it's created in a tenant namespace, not the other way around. Update the condition as follows:
if !isTenant {
log.Info("Ignoring NaasNamespace resource, as it is not created in a tenant namespace", "Namespace", req.Namespace)
return ctrl.Result{}, nil
}Now, the code will ignore the NaasNamespace resource if it's created within a non-tenant namespace. The rest of the logic handles the creation and deletion of the corresponding Kubernetes namespace based on the presence or absence of the NaasNamespace custom resource.
thanks that was a good catch!
You're welcome! I'm glad I could help you identify and fix the issue. If you have any more questions or need further assistance, please don't hesitate to ask. Good luck with your project!
now, please refactor the Reconcile function so that the most of the business logic is performed in a Handler function. this function would not take the ctrl.Request parameter nor return the ctrl.Result. This way I can create a unit test that tests most of the logic without worrying about creating artificial ctrl.Request and ctrl.Result objects.
To refactor the Reconcile function and move most of the business logic into a separate Handler function, follow these steps:
- Create the Handler function with the following signature:
func (r *NaasNamespaceReconciler) Handler(ctx context.Context, namespaceName, naasNamespaceName string) error {
// Business logic will be moved here
}- Move the business logic from the Reconcile function to the Handler function, updating variable names as needed:
func (r *NaasNamespaceReconciler) Handler(ctx context.Context, namespaceName, naasNamespaceName string) error {
log := ctrl.LoggerFrom(ctx)
// Retrieve the NaasNamespace instance
nassNamespace := &corev1alpha1.NaasNamespace{}
err := r.Get(ctx, client.ObjectKey{Namespace: namespaceName, Name: naasNamespaceName}, nassNamespace)
// Define the desired Namespace object
targetNamespaceName := fmt.Sprintf("%s-%s", namespaceName, naasNamespaceName)
targetNamespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: targetNamespaceName,
},
}
// Check if the Namespace already exists
existingNamespace := &corev1.Namespace{}
nsErr := r.Get(ctx, client.ObjectKey{Name: targetNamespace.Name}, existingNamespace)
if err != nil && errors.IsNotFound(err) {
// NassNamespace doesn't exist
if nsErr == nil {
// Namespace exists, delete it
log.Info("Deleting namespace", "Namespace", targetNamespaceName)
if err := r.Delete(ctx, existingNamespace); err != nil {
log.Error(err, "Failed to delete namespace", "Namespace", targetNamespaceName)
return err
}
} else if !errors.IsNotFound(nsErr) {
// Error getting the namespace
log.Error(nsErr, "Failed to get Namespace")
return nsErr
}
} else if err == nil {
// NaasNamespace exists
if nsErr != nil && errors.IsNotFound(nsErr) {
// Namespace doesn't exist, create it
log.Info("Creating new namespace", "Namespace", targetNamespaceName)
if err := r.Create(ctx, targetNamespace); err != nil {
log.Error(err, "Failed to create namespace", "Namespace", targetNamespaceName)
return err
}
} else if nsErr != nil {
// Error getting the namespace
log.Error(nsErr, "Failed to get Namespace")
return nsErr
}
} else {
// Error getting the NassNamespace
log.Error(err, "Failed to get NassNamespace")
return err
}
return nil
}- Modify the Reconcile function to call the Handler function and handle its error:
func (r *NaasNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Check if the NaasNamespace is created in a tenant namespace
isTenant, err := r.isTenantNamespace(ctx, req.Namespace)
if err != nil {
log.Error(err, "Failed to get tenant namespace information")
return ctrl.Result{}, err
}
if !isTenant {
log.Info("Ignoring NaasNamespace resource, as it is not created in a tenant namespace", "Namespace", req.Namespace)
return ctrl.Result{}, nil
}
if err := r.Handler(ctx, req.Namespace, req.Name); err != nil {
return ctrl.Resultthat last Reconcile part was incomplete.
Apologies for the incomplete response. Here's the corrected and complete Reconcile function:
func (r *NaasNamespaceReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := ctrl.LoggerFrom(ctx)
// Check if the NaasNamespace is created in a tenant namespace
isTenant, err := r.isTenantNamespace(ctx, req.Namespace)
if err != nil {
log.Error(err, "Failed to get tenant namespace information")
return ctrl.Result{}, err
}
if !isTenant {
log.Info("Ignoring NaasNamespace resource, as it is not created in a tenant namespace", "Namespace", req.Namespace)
return ctrl.Result{}, nil
}
if err := r.Handler(ctx, req.Namespace, req.Name); err != nil {
log.Error(err, "Failed to process NaasNamespace")
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}With this refactored code, the Reconcile function now checks if the NaasNamespace resource is created within a tenant namespace and calls the Handler function to process the NaasNamespace resource. The Handler function contains the main business logic, making it easier to test without having to create artificial ctrl.Request and ctrl.Result objects.
now please create a main.go file that will create and set up this operator
Here's a main.go file that sets up the NaasNamespace operator using controller-runtime:
package main
import (
"flag"
"os"
corev1alpha1 "github.com/your-org/your-repo/api/v1alpha1"
"github.com/your-org/your-repo/controllers"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
func main() {
var metricsAddr string
var enableLeaderElection bool
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false, "Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
opts := zap.Options{
Development: true,
}
opts.BindFlags(flag.CommandLine)
flag.Parse()
ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), manager.Options{
Scheme: ctrl.SchemeBuilder.AddToScheme,
MetricsBindAddress: metricsAddr,
Port: 9443,
LeaderElection: enableLeaderElection,
LeaderElectionID: "naasnamespace-operator",
})
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
// Add the NaasNamespace reconciler to the manager
if err = (&controllers.NaasNamespaceReconciler{
Client: mgr.GetClient(),
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "NaasNamespace")
os.Exit(1)
}
setupLog.Info("starting manager")
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}Replace github.com/your-org/your-repo with the import path of your project. This main.go sets up the operator, creates a manager, and adds the NaasNamespaceReconciler to the manager. It also sets up leader election and the metrics endpoint.
Before running the operator, make sure you have the following:
- A Go module set up for your project.
- The api/v1alpha1 package containing the NaasNamespace API definition.
- The controllers package containing the NaasNamespaceReconciler implementation.
Build and run the operator using the following commands:
go build -o naasnamespace-operator main.go
./naasnamespace-operator
Note that you'll need to have a working Kubernetes cluster and proper kubeconfig file for the operator to work correctly.
setupLog is apparently unresolved
Apologies for the oversight. It seems I missed defining the setupLog. Here's the corrected version of the main.go file with the setupLog defined:
package main
import (
"flag"
"os"
corev1alpha1 "github.com/your-org/your-repo/api/v1alpha1"
"github.com/your-org/your-repo/controllers"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
func main() {
var metricsAddr string
var enableLeaderElection bool
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false, "Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
opts := zap.Options{
Development: true,
}
opts.BindFlags(flag.CommandLinewhat do i import for setupLog?
My apologies for the confusion. You don't need to import anything for setupLog. Instead, you should create an instance of the logger using the controller-runtime's logger package. Add the following line at the beginning of the main function to initialize the setupLog:
setupLog := ctrl.Log.WithName("setup")With this line added, the setupLog variable will be properly defined and ready to use in the rest of the main.go file.
compiler complains about ctrl.SchemeBuilder.AddToScheme
Apologies for the confusion. It seems I made an error in referencing ctrl.SchemeBuilder.AddToScheme. You should use mgr.GetScheme().AddToScheme instead. Here's the corrected version of the main.go file:
package main
import (
"flag"
"os"
corev1alpha1 "github.com/your-org/your-repo/api/v1alpha1"
"github.com/your-org/your-repo/controllers"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
)
func main() {
var metricsAddr string
var enableLeaderElection bool
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false, "Enable leader election for controller manager.the problem is that the following does not work: mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), manager.Options{ Scheme: ctrl.SchemeBuilder.AddToScheme, MetricsBindAddress: metricsAddr, Port: 9443, LeaderElection: enableLeaderElection, LeaderElectionID: "naasnamespace-operator", })
Apologies for the confusion in my previous response. It appears I made an error in the manager setup. You should add your NaasNamespace API to the scheme, and then pass the scheme to the manager options. Here's the corrected version of the main.go file:
package main
import (
"flag"
"os"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
corev1alpha1 "github.com/your-org/your-repo/api/v1alpha1"
"github.com/your-org/your-repo/controllers"
)
func main() {
var metricsAddr string
var enableLeaderElection bool
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false, "Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
opts := zap.Options{
Development: true,
}
opts.BindFlags(flag.CommandLine)
flag.Parse()
ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
setupLog := ctrl.Log.WithName("setup")
scheme := runtime.NewScheme()
_ = clientgoscheme.AddToScheme(scheme)
_ = corev1alpha1.AddToScheme(scheme)
_ = corev1.AddToScheme(scheme)
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), manager.Options{
Scheme: scheme,
MetricsBindAddress: metricsAddr,
Port: 9443,
LeaderElection: enableLeaderElection,
LeaderElectionID: "naasnamespace-operator",
})
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
if err = (&controllers.NaasNamespaceReconciler{
Client: mgr.GetClient(),
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "NaasNamespace")
os.Exit(1)
}
setupLog.Info("starting manager")
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}In this corrected version, I've created a new scheme and added the required schemes for clientgoscheme, corev1alpha1 (which represents your NaasNamespace API), and corev1. Then, I've passed the scheme to the manager options. This should resolve the issue with the manager setup.
refactor to use Viper for command-line flags
To use Viper for command-line flags, you first need to install the Viper package. Run the following command to add it to your Go module:
go get -u github.com/spf13/viper
Next, modify your main.go file to use Viper for handling command-line flags. Here's the refactored version of the main.go file:
package main
import (
"os"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
corev1alpha1 "github.com/your-org/your-repo/api/v1alpha1"
"github.com/your-org/your-repo/controllers"
"github.com/spf13/pflag"
"github.com/spf13/viper"
)
func init() {
viper.AutomaticEnv()
// Bind command line flags to Viper
pflag.String("metrics-addr", ":8080", "The address the metric endpoint binds to.")
pflag.Bool("enable-leader-election", false, "Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
pflag.Parse()
_ = viper.BindPFlags(pflag.CommandLine)
}
func main() {
metricsAddr := viper.GetString("metrics-addr")
enableLeaderElection := viper.GetBool("enable-leader-election")
opts := zap.Options{
Development: true,
}
opts.BindFlags(pflag.CommandLine)
ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
setupLog := ctrl.Log.WithName("setup")
scheme := runtime.NewScheme()
_ = clientgoscheme.AddToScheme(scheme)
_ = corev1alpha1.AddToScheme(scheme)
_ = corev1.AddToScheme(scheme)
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), manager.Options{
Scheme: scheme,
MetricsBindAddress: metricsAddr,
Port: 9443,
LeaderElection: enableLeaderElection,
LeaderElectionID: "naasnamespace-operator",
})
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
if err = (&controllers.NaasNamespaceReconciler{
Client: mgr.GetClient(),
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "NaasNamespace")
os.Exit(1)
}
setupLog.Info("starting manager")
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}This version of main.go uses Viper for command-line flags. The init function sets up Viper to read environment variables and bind command-line flags. The pflag package is used to define the flags and parse them, and Viper is then used to access the flag values in the main function.