Ruby on Rails Docker Container from Scratch - Ubuntu

Dockerfile

# Derive an Ubuntu Image
FROM ubuntu:18.04

# Update and Upgrade
RUN apt-get update
RUN apt-get upgrade

# Install base `ruby`
RUN sudo apt install ruby
# Rails installs as a GEM
RUN gem install rails
# This allows us to run the 'rails' command
RUN apt install ruby-railties
# Allows us to use the bundle command
RUN apt install ruby-bundler
# Allows us to install ruby gems with native extensions
RUN apt install ruby-dev

# Typically:
# Install base `ruby`
# sudo apt install ruby

# Rails installs as a GEM
# gem install rails

# This allows us to run the 'rails' command
# sudo apt install ruby-railties

# Allows us to use the bundle command
# sudo apt install ruby-bundler

# Allows us to install ruby gems with native extensions
# sudo apt install ruby-dev