How to flatten an image with 127 parents

Docker Engine General
2

You can flatten an image with docker export and then docker import. That will take all the existing layers and export them as a single file system image, in a tarball. Then import will bring it back in again as an image.

Steps:

  1. docker run --name mycontainer the image to create a container (the container name mycontainer is just an example)
  2. docker export --output=mycontainer.tar mycontainer the container to a tarball (mycontainer.tar is just an example)
  3. cat mycontainer.tar | docker import - mynewimage:imported the tarball (the image name mynewimage:imported is just an example)

Docs: