Description: The Kubernetes controller is an essential component in the Kubernetes architecture, acting as a control loop that observes the state of the cluster and makes or requests changes where necessary. Its primary function is to ensure that the current state of the cluster matches the desired state defined by the user. This is achieved through the implementation of design patterns such as the ‘control loop’, where the controller continuously checks the state of resources and makes automated decisions to maintain consistency. Controllers can be native to Kubernetes or custom-built, allowing developers to extend the functionality of the cluster according to their specific needs. Additionally, controllers are fundamental for resource management, scalability, and fault recovery, making them a key piece in container orchestration. In the cloud context, their ability to interact with different environments, such as virtual private clouds, hybrid clouds, and multi-cloud setups, enables efficient and optimized resource management. Infrastructure as code is also enhanced, as controllers can be defined and managed through configuration files, promoting automation and reproducibility in infrastructure.
