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DevOps & Automation · Foundational

Build Once, Deploy Many

The principle that a single immutable build artifact is created once and promoted unchanged to every environment.

Definition

This guarantees that what was tested is exactly what runs in production. Environment differences are supplied through configuration, secrets, and variables at deploy time.

Example

One container image digest moves from dev to prod; only ConfigMaps differ.

Exam tip

If a scenario rebuilds code for production, the fix is to promote the tested artifact instead.

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