YAML Basics Explained: Syntax, Use Cases, and Kubernetes Config Guide
YAML is a human-readable data serialization language, similar to JSON and XML, designed to transfer data between applications built on different technologies using a common format. Unlike XML and JSON, YAML relies on line separation and strict indentation rather than brackets or tags, making it intuitive for developers to read and write. It is widely used in DevOps tooling, including Docker Compose, Kubernetes, Ansible, and Prometheus, primarily for writing configuration files. Core YAML syntax supports key-value pairs, nested objects, lists, boolean values, and inline arrays, all structured through indentation levels. In Kubernetes, YAML files define resources such as Pods by specifying fields like apiVersion, metadata, and spec, which contain nested objects and lists describing containers and volumes.
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