Why are Docker container images so large?

Question

I made a simple image through Dockerfile from Fedora (initially 320 MB).

Added Nano (this tiny editor of 1MB size), and the size of the image has risen to 530 MB. I\

Answer 1

Docker Squash is a really nice solution to this. you can $packagemanager clean in the last step instead of in every line and then just run a docker squash to get rid of all of the layers.

https://github.com/jwilder/docker-squash