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Section 8: Operators

Overview​

This section teaches how to build Kubernetes operators to automate application management using the Operator pattern and frameworks.

Key Concepts​

  • Operator pattern and reconciliation loop
  • Controller-runtime and Kubebuilder framework
  • Custom controllers for CRDs
  • Operator lifecycle management

Example​

// Reconcile handles VotingApp resource reconciliation
func (r *VotingAppReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
    log := log.FromContext(ctx)

    var votingApp examplev1.VotingApp
    if err := r.Get(ctx, req.NamespacedName, &votingApp); err != nil {
        return ctrl.Result{}, client.IgnoreNotFound(err)
    }

    // Reconciliation logic here
    log.Info("Reconciling VotingApp", "name", votingApp.Name)

    return ctrl.Result{}, nil
}

Coming Soon​

Full content will be added in later phases of this project.