Immutable Infrastructure - CI/CD Glossary Definition
Immutable infrastructure is a model where servers are never modified after deployment: to change anything, you build a new image and replace the running instance. Nothing is patched or configured in place.
Why it matters
Immutability eliminates configuration drift and "works on that box" problems, making deployments predictable and rollbacks trivial (just redeploy the previous image). Ephemeral CI runners are a form of immutable infrastructure.
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