Web Development

The mysql2 gem hangs almost always on a newly installed system. You would most likely see this in the terminal.

Installing mysql2 0.3.19 with native extensions

The system might not have MySQL installed. Try installing MySQL.

Mac

brew install mysql

Ubuntu/Debian

apt-get install mysql-server libmysqlclient-dev -y

CentOS/RHEL

yum install mysql-server

Fixed!