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What is the difference between `docker commit` and writing a Dockerfile?
`docker commit` snapshots a running container's current state into a new image, but the result is undocumented and non-reproducible (no record of how it got that way). A Dockerfile is a declarative, version-controllable, reproducible recipe; production images should always come from Dockerfiles, with `commit` reserved for quick ad hoc debugging snapshots.
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