21. Docker: Flatten an Image
vi Dockerfile
FROM ubuntu
LABEL description = "My custamized image"
LABEL version = "V1.0"
RUN apt-get update -y
RUN apt-get install curl -y
docker image build -t multilayer .
docker image history multilayer
docker container run -d -it --name myubuntu multilayer
docker export myubuntu # singlelayer.tar
cat singlelayer.tar | docker import - newmyubuntu:latest
docker image ls
docker image history newmyubuntu
