Understanding Kubernetes operators
One of the fundamental principles of Kubernetes is that the current state of resources within the cluster matches the desired state, a process known as the control loop. The control loop is an ongoing, non-terminating pattern of monitoring the state of the cluster through the use of controllers. Kubernetes includes numerous controllers that are native to the platform, with examples ranging from admission controllers that intercept requests made to the API server to replication controllers that ensure the configuration of pod replicas.
As interest in Kubernetes began to grow, the combination of providing users with the ability to extend the capabilities of the platform, as well as a way to provide more intelligence around managing the life cycle of applications, led to the creation of a couple of important features to support Kubernetes development. First, the introduction of CRDs enabled users the ability to extend the default Kubernetes API in...
