DevOps Intermediate

What is Feature Flag?

A technique that allows enabling or disabling features in production without deploying new code, enabling safe rollouts and A/B testing.

Feature flags (feature toggles) wrap new features in conditional checks that can be toggled on/off remotely. This decouples deployment from release — code can be deployed but hidden until ready, or enabled for specific users/percentages.

Use cases include gradual rollouts, A/B testing, kill switches for problematic features, and subscription-based feature access. Tools include LaunchDarkly, Unleash, and Flagsmith. Clean up old flags to prevent technical debt.

Related Terms

A practice where Git repositories serve as the single source of truth for both application code and infrastructure configuration.

Chaos Engineering

The discipline of deliberately introducing failures into a system to test its resilience and identify weaknesses before they cause outages.

Immutable Deployment

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

Semantic Versioning

A versioning scheme using MAJOR.MINOR.PATCH numbers that communicates the nature of changes in each release.

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

A branching model for Git that defines a strict workflow with feature, develop, release, hotfix, and main branches.

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