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I'd be careful with such assumptions. Docker forwards implementation details of the host system/userspace and isn't a VM after all. A Docker image is not forwar

I'd be careful with such assumptions. Docker forwards implementation details of the host system/userspace and isn't a VM after all. A Docker image is not forward-compatible with future Docker or host versions. Which implies the question whether people use Docker for the wrong reasons if their intention is to obtain future-proof reproducible builds etc., rather than merely increase image-per-machine density

danudey 8y ago
Docker provides a lot more future-proof reproducibility than other deployment strategies, though. It's not 100% guaranteed, but whether a given docker image is forwards-compatible doesn't matter as long as the reproducibility of creating the Docker image doesn't change substantially. In other words, as long as I can get (or make) an ubuntu:xenial docker image and apply the same (or similar) transformations to it to make the end result, it doesn't matter nearly as much whether specifically this Docker instance works across all versions of Docker forever.