follow the tutorial from the radiant documentation

install the gem and issue

$ radiant --database=[database adapter] [path]
to create the basic radiant installation. and continue creating the databases

mysql -u <username> -p # enter password
mysql> CREATE DATABASE `<DB_NAME>_test` ;
mysql> CREATE DATABASE `<DB_NAME>_development` ;
mysql> CREATE DATABASE `<DB_NAME>_production` ;

rake production db:bootstrap

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