Do I need MySQL installed locally as well?
production:
  adapter: mysql
  encoding: utf8
  reconnect: false
  database: gtt_production
  pool: 5
  username: root
  password: admin
  host: 192.168.9.15
  port: 3306

mysql -h 192.168.9.15 -uroot -p

The program 'mysql' can be found in the following packages:
   * mysql-client-cor-5.1
 Try: sudo apt-get install <selected package>