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"It makes you wonder how it's been this long and nobody stumbled upon an issue that you uncover 30 minutes into tool's use."

Either you're doing something wrong or everybody's extremely lucky. If you've used Docker for 30 minutes I would bet on the former :)

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Or everyone got used to it and don't consider it being an issue.

I believe that the filesystem layering feature in Docker is an anti-feature. It depends on unstable kernel features to work properly and doesn't really address the caching issues properly. Dependencies are usually in a tree, not linear like presented in a Dockerfile.

Exactly!

My company is extensively using docker. It has made deployment and maintaining different versions too smooth.

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