cd docs make ruby-doc
.static/ruby-doc/index.html in the
docs directory and browse the Ruby documentation
role "ec2-user" does not existon an AWS instance?
After installing and configuring PostgreSQL on an AWS EC2 (or AWS Cloud9) instance and running
bin/setup, this error could occur.
To fix it, run the following two commands in a terminal (assuming your PostgreSQL user is named postgres):
sudo -u postgres createuser -s ec2-user sudo -u postgres createdb ec2-user
The first command creates the user ec2-user and the second one creates the database for this user, because every user needs its database. Even if the first command fails, run the second command to create the missing database.