AWS Elastic Beanstalk
Developer Guide (API Version 2010-12-01)
AWS services or capabilities described in AWS documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon AWS.

Adding an Amazon RDS DB Instance to Your Ruby Application Environment

You can use an Amazon Relational Database Service (Amazon RDS) DB instance to store data gathered and modified by your application. The database can be attached to your environment and managed by Elastic Beanstalk, or created and managed externally.

If you are using Amazon RDS for the first time, add a DB instance to a test environment with the Elastic Beanstalk Management Console and verify that your application can connect to it.

To connect to a database, add the adapter to your application and configure a connection with the environment properties provided by Elastic Beanstalk. The configuration and connection code vary depending on the database engine and framework that you use.

For production environments, create a DB instance outside of your Elastic Beanstalk environment to decouple your environment resources from your database resources. Using an external DB instance lets you connect to the same database from multiple environments and perform blue-green deployments. For instructions, see Using Elastic Beanstalk with Amazon Relational Database Service.

Adding a DB Instance to Your Environment

To add a DB instance to your environment

  1. Open the Elastic Beanstalk console.

  2. Navigate to the management page for your environment.

  3. Choose Configuration.

  4. On the Database configuration card, choose Modify.

  5. Choose a DB engine, and enter a user name and password.

  6. Choose Save, and then choose Apply.

Adding a DB instance takes about 10 minutes. When the environment update is complete, the DB instance's hostname and other connection information are available to your application through the following environment properties:

  • RDS_HOSTNAME – The hostname of the DB instance.

    Amazon RDS console label – Endpoint (this is the hostname)

  • RDS_PORT – The port on which the DB instance accepts connections. The default value varies between DB engines.

    Amazon RDS console label – Port

  • RDS_DB_NAME – The database name, ebdb.

    Amazon RDS console label – DB Name

  • RDS_USERNAME – The user name that you configured for your database.

    Amazon RDS console label – Username

  • RDS_PASSWORD – The password that you configured for your database.

For more information about configuring an internal DB instance, see Adding a Database to Your Elastic Beanstalk Environment.

Downloading an Adapter

Add the database adapter to your project's gem file.

Example Gemfile – Rails with MySQL

source '' gem 'puma' gem 'rails', '4.1.8' gem 'mysql2'

Common Adapter Gems for Ruby

  • MySQLmysql2

  • PostgreSQLpg

  • Oracleactiverecord-oracle_enhanced-adapter

  • SQL Server sql_server

Connecting to a Database

Elastic Beanstalk provides connection information for attached DB instances in environment properties. Use ENV['VARIABLE'] to read the properties and configure a database connection.

Example config/database.yml – Ruby on Rails Database Configuration (MySQL)

production: adapter: mysql2 encoding: utf8 database: <%= ENV['RDS_DB_NAME'] %> username: <%= ENV['RDS_USERNAME'] %> password: <%= ENV['RDS_PASSWORD'] %> host: <%= ENV['RDS_HOSTNAME'] %> port: <%= ENV['RDS_PORT'] %>