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What is YAML?

A human-readable data serialization language commonly used for configuration files in DevOps tools and applications.

YAML (YAML Ain't Markup Language) uses indentation-based structure to represent data. It supports scalars, lists, and dictionaries. Example: name: John, items: [a, b, c]. YAML is more readable than JSON but sensitive to whitespace.

Widely used in Kubernetes manifests, Docker Compose files, Ansible playbooks, GitHub Actions, and application configuration. YAML supports comments (unlike JSON), multi-line strings, anchors (reuse), and complex data types.

Related Terms

Infrastructure as Code (IaC)
The practice of managing infrastructure through machine-readable configuration files rather than manual processes.
Message Queue
A communication mechanism that enables asynchronous message passing between services, decoupling producers from consumers.
Istio
An open-source service mesh that provides traffic management, security, and observability for microservices on Kubernetes.
Chaos Engineering
The discipline of deliberately introducing failures into a system to test its resilience and identify weaknesses before they cause outages.
Kubernetes ConfigMap
A Kubernetes object that stores non-sensitive configuration data as key-value pairs, injected into pods as environment variables or files.
Postmortem
A structured analysis conducted after an incident to understand what happened, why, and how to prevent recurrence โ€” without assigning blame.
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