DevOps Beginner

What is Runbook?

A documented set of standardized procedures for handling routine operations and incident response in production systems.

Runbooks provide step-by-step instructions for operational tasks like deploying updates, scaling services, responding to alerts, and recovering from failures. They reduce Mean Time To Recovery (MTTR) by giving on-call engineers clear procedures instead of requiring them to diagnose from scratch. Modern runbooks range from simple Markdown documents to interactive notebooks that can execute commands. Runbook automation takes this further by encoding procedures as scripts that can be triggered automatically by monitoring alerts, reducing human intervention and error.

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An open-source container orchestration platform that automates deploying, scaling, and managing containerized applications.

A tool for defining and running multi-container Docker applications using a YAML configuration file.

Immutable Deployment

A deployment strategy where new versions replace existing instances entirely rather than updating them in place.

An endpoint or mechanism that reports whether an application is running correctly and ready to handle requests.

Infrastructure Drift

The divergence between the actual state of infrastructure and its defined desired state, caused by manual changes or untracked modifications.

Service Discovery

A mechanism that automatically detects and tracks the network locations of service instances in distributed systems.

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