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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

Health Check
An endpoint or mechanism that reports whether an application is running correctly and ready to handle requests.
Docker Compose
A tool for defining and running multi-container Docker applications using a YAML configuration file.
Monitoring
The practice of collecting, analyzing, and alerting on system metrics and logs to ensure application health and performance.
Postmortem
A structured analysis conducted after an incident to understand what happened, why, and how to prevent recurrence — without assigning blame.
Canary Deployment
A deployment strategy that gradually rolls out changes to a small subset of users before deploying to the entire infrastructure.
Ansible
An agentless automation tool for configuration management, application deployment, and task automation using YAML playbooks.
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