How to generate a Dockerfile from an image?

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chenzj/dfimage - as described on hub.docker.com regenerates Dockerfile from other images. So you can use it as follows:docker pull chenzj/dfimage 
alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm chenzj/dfimage"  dfimage IMAGE_ID > Dockerfil

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