Docker : How to access the Dockerfile of an image?

Question

When I run the command docker images I get the list as shown below.

[root@hadoop01 myjavadir]# docker images

REPOSITORY                          


        

Answer 1

see dockerfile from image from centurylinklabs

https://github.com/CenturyLinkLabs/dockerfile-from-image

docker history

on an image will give you the main information, see the doc

https://docs.docker.com/engine/reference/commandline/history/

I had written this short Python script which does a little less than dockerfile-from-image

import subprocess
import sys

def main():

    dockid = sys.argv[1]
    args = ['docker', 'history', dockid]
    proc = subprocess.Popen(args=args, stdout=subprocess.PIPE,
                            stderr=subprocess.STDOUT)
    (stdout, stderr) = proc.communicate() 
    lines = stdout.split('\n')[1:-2]
    lines.reverse()
    for line in lines:
        idlayer = line.split(' ')[0]
        args = ['docker', 'inspect', 
                "--format", "'{{ ((index .ContainerConfig.Cmd ) 0) }}'",
                idlayer]
        proc = subprocess.Popen(args=args, stdout=subprocess.PIPE,
                                stderr=subprocess.STDOUT)
        (stdout, stderr) = proc.communicate() 
        print stdout,
        # print idlayer, stdout,

main()