Duplicate images with same id in Docker -


when download image docker-compose file, images duplicated. here docker-compose.yml

 version: "3" services:     ubuntu:       build: ./linux       container_name: ubuntu       stdin_open: true       tty: true

my dockerfile in linux folder

 ubuntu

the output of command "$docker images":

 repository          tag                 image id            created             size ubuntu              latest              ccc7a11d65b1        9 days ago          120 mb ubuntu_ubuntu       latest              ccc7a11d65b1        9 days ago          120 mb

in dockefile, used from ubuntu, inherited image , did nothing out of it. new image nothing same ubuntu image. , why seeing same id

repository          tag                 image id            created             size ubuntu              latest              ccc7a11d65b1        9 days ago          120 mb ubuntu_ubuntu       latest              ccc7a11d65b1        9 days ago          120 mb

it doesn't mean have 240mb occupied same 2 images. means ubuntu , ubuntu_ubuntu point same image , image size 120 mb.

you can below 

docker tag ubuntu ubuntu_my

and create entry name , same id , size. name , tag reference id. multiple names can point same id.


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