UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.
Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/
sudo amazon-linux-extras install docker
sudo service docker start
A collection of links to useful cheat sheets.
Only what's properly printable can get a spot at the top of this list. It should also be small enough to fit on a few pages. almost all links in this document were designed by their creators so that YOU can print them in a good-looking format and store them however is best for you. Anything that isn't really something you could print in A4/US Letter format, but is still a well-made cheatsheet can get a spot at the end of the page.
Pleae contribute any you remember you've seen and liked. It would be wonderful if we can get these to be something more commonly made.