MySQL Rails


Integrate MySQL with Ruby on Rails

This quickstart guide will help you to integrate your Rails application with MySQL service on App42 PaaS.


Kontena – Kontena is a lightweight container that will run your apps and services in an isolated and secured manner. You can specify the power of the Kontena while setting up infra or creating services. One Kontena power specifies to 256 MB Memory and 128 MHz CPU.

Service – Services in the App42 PaaS are add-on components which are needed in an App. App42 PaaS supports multiple services like SQL databases, NoSQL databases and more.


To get going with App42 PaaS, below are few prerequisites that will allow you to use AppHQ – App42 PaaS Management Console as well as Command Line Client.

Configure MySQL credentials into Rails App

Once you have created the MySQL service, You need to let application know about the database configuration information to connect with service If your database file is config/database.yml, then it will automatically be picked up, and you don’t need to set anything. Otherwise you need to specify the path (can be relative):

adapter: mysql2            
host: < host >                          # VM IP
port: < port >                          # VM Port 
database: < database name >             # Database Name
username: < user_name >                 # User Name
password: '< password >'                # Password

You can also use our Sample Apps and extend it to suit your needs. Here is the link to Rails MySQL Sample App

Update Application

After doing all the modifications to your App, you need to update it on App42 PaaS to get the changes affected in your App running on App42 PaaS platform.

$ app42 update
Enter App Name: javademo
1: Binary
2: Source
Choose Upload Type [Binary]: 2

Updating Application... OK

Operation is in progress, Please wait...-
App deployed successfully.