Certified Kubernetes Application Developer (CKAD) Practice Test

The primary file format used for Kubernetes configuration files is YAML. This format is favored due to its readability and simplicity, making it easier for developers to write and manage configuration data. YAML stands for "YAML Ain't Markup Language" and is specifically designed to be human-friendly, which helps in accurately defining complex structures in a straightforward manner.

In Kubernetes, resources such as pods, services, deployments, and more are typically defined using YAML syntax. This allows developers to easily specify properties, configurations, and relationships between different resources in a clear and understandable manner. Additionally, YAML supports comments, enabling developers to annotate their configurations for clarity.

The use of YAML also aligns well with Kubernetes’ approach of maintaining declarative configuration, allowing users to describe the desired state of their applications rather than specifying the steps to achieve that state. This is a fundamental concept within Kubernetes and is one reason YAML is so widely used in this context.