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Michael P. Porter

Ephemeral Containers

Every task runs in a fresh, ephemeral container — there’s no persistent build-agent state carried between runs.

If a task secretly depends on state left behind by a previous run, Concourse surfaces that immediately: the next run starts clean and just fails. That’s cheaper to catch in CI than in production, and it’s the same design goal behind Jenkins’s dynamic Kubernetes agents — a build environment that can’t accumulate drift because it doesn’t have a lifespan to drift over.

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