module.exports = {
    development: {
        ip: '127.0.0.1',
        port: 8080,
        db: {
            host: '127.0.0.1',
            port: 3306,
            protocol: 'mysql',
            user: 'root',
            password: '123456789',
            database: 'express-orm-mvc-test',
            connectionLimit: 100
        }
    },
    production: {
        ip: '127.0.0.1',
        port: 8080,
        db: {
            host: '127.0.0.1',
            port: 3306,
            protocol: 'mysql',
            user: 'wercker',
            password: 'wercker',
            database: 'werckerdb1',
            connectionLimit: 100
        }
    }
};

@@ -424,35 +424,54 @@
       host: 
-'127.0.0.1'
+process.env.WERCKER_MYSQL_HOST
 ,%0A          

Update settings.js