devops-exercises/exercises/containers/image_layers.md

Layer by Layer

Objective

Learn about image layers

Requirements

Make sure Docker is installed on your system and the service is started

# Fedora/RHEL/CentOS
rpm -qa | grep docker
systemctl status docker

Instructions

1. Write a Dockefile. Any Dockefile! :) (just make sure it's a valid one)
2. Build an image using the Dockerfile you've wrote
3. Which of the instructions you've used, created new layers and which added image metadata?
4. What ways are there to confirm your answer to the last question?
5. Can you reduce the size of the image you've created?