How to generate a Dockerfile from an image?

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How to generate or reverse a Dockerfile from an image?

You can. Mostly.

Notes: It does not generate a Dockerfile that you can use directly with docker build; the output is just for your reference.

alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm alpine/dfimage"
dfimage -sV=1.36 nginx:latest

It will pull the target docker image automatically and export Dockerfile. Parameter -sV=1.36 is not always required.

Reference: https://hub.docker.com/repository/docker/alpine/dfimage

Now hub.docker.com shows the image layers with detail commands directly, if you choose a particular tag.

enter image description here

Bonus

If you want to know which files are changed in each layer

alias dive="docker run -ti --rm  -v /var/run/docker.sock:/var/run/docker.sock wagoodman/dive"
dive nginx:latest

enter image description here

On the left, you see each layer’s command, on the right (jump with tab), the yellow line is the folder that some files are changed in that layer

(Use SPACE to collapse dir)

Old answer

below is the old answer, it doesn’t work any more.

$ docker pull centurylink/dockerfile-from-image
$ alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm centurylink/dockerfile-from-image"
$ dfimage --help
Usage: dockerfile-from-image.rb [options] <image_id>
    -f, --full-tree                  Generate Dockerfile for all parent layers
    -h, --help                       Show this message

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