Como instalar o Discourse em instâncias AWS EC2 (Ubuntu Server LTS)?

[Lee533 (· Lee)]

• What are you doing?
  I have already bought a domain(and without change any settings), registered a AWS account, and launch a Instance, connected to the Instance from Windows using PuTTY, follow Set up Discourse in the cloud in under 30 minutes from Install Docker / Git step and finished Edit Discourse Configuration.

• What do you expect to happen?
  Continue to follow Set up Discourse in the cloud in under 30 minutes‘ Start Discourse step.

• What actually happens?
  Page displayed This site can’t be reached