immutable infrastructure
termcloudops culture
An approach where servers are never modified in place; to change one, you replace it with a new build.
Captured in the phrase "cattle, not pets", immutable infrastructure avoids the drift and surprises of hand-patched machines by rebuilding from a known image every time. It makes deployments predictable and rollbacks trivial: just bring back the old image.
Also known as: immutable-infrastructure, cattle not pets, phoenix server