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I see docker-compose.prod.yml -- but I was under the impression that nobody used docker-compose in production, and I vaguely remember that it was even discouraged by Docker. Is that what docker-compose is used for now? Am I misremembering? (I've never used docker-compose in any serious manner.)

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Plenty of people use docker compose in production. If what you are standing up works fine on a single machine it works really great, if you need something that runs in a more distributed manner, there are tools for converting a docker compose file to a set of kubernetes manifests. Docker compose also has some really nice features around using .env files so it’s easy to test/develop locally and deploy as a 12 factor app.

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