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AWS Elastic Beanstalk
Developer Guide (API Version 2010-12-01)

Adding an Amazon RDS DB Instance to Your PHP 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 console and verify that your application can connect to it.

To connect to a database, add the driver to your application, load the driver class in your code, and create a connection object 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 RDS.

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. Under Data Tier, choose Create a new RDS database.

  5. Choose a DB engine, enter a user name and password, 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 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 Configuring Databases with Elastic Beanstalk.

Downloading a Driver

To use PHP Data Objects (PDO) to connect to the database, install the driver that matches the database engine that you chose.

For more information, see php.net/manual/pdo.installation.php.

Connecting to a Database with a PDO or MySQLi

You can use $_SERVER[`VARIABLE`] to read connection information from the environment.

For a PDO, create a Data Source Name (DSN) from the host, port, and name. Pass the DSN to the constructor for the PDO with the database user name and password.

Example Connect to an RDS database with PDO - MySQL

<?php
$dbhost = $_SERVER['RDS_HOSTNAME'];
$dbport = $_SERVER['RDS_PORT'];
$dbname = $_SERVER['RDS_DB_NAME'];
$charset = 'utf8' ;

$dsn = "mysql:host={$dbhost};port={$dbport};dbname={$dbname};charset={$charset}";
$username = $_SERVER['RDS_USERNAME'];
$password = $_SERVER['RDS_PASSWORD'];

$pdo = new PDO($dsn, $username, $password);
?>

For other drivers, replace mysql with the name of your driver – pgsql, oci, or sqlsrv.

For MySQLi, pass the hostname, user name, password, database name, and port to the mysql_connect function.

Example Connect to an RDS database with mysqli_connect()

$link = mysqli_connect($_SERVER['RDS_HOSTNAME'], $_SERVER['RDS_USERNAME'], $_SERVER['RDS_PASSWORD'], $_SERVER['RDS_DB_NAME'], $_SERVER['RDS_PORT']);