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AWS SDK for Ruby
Developer Guide

Configuring the AWS SDK for Ruby

Learn how to configure the AWS SDK for Ruby. To use the SDK, you must set either AWS credentials or create an AWS STS access token, and set the AWS Region you want to use.

Get your AWS access keys

Access keys consist of an access key ID and secret access key, which are used to sign programmatic requests that you make to AWS. If you don't have access keys, you can create them by using the AWS Management Console. We recommend that you use IAM access keys instead of AWS root account access keys. IAM lets you securely control access to AWS services and resources in your AWS account.

Note

To create access keys, you must have permissions to perform the required IAM actions. For more information, see Granting IAM User Permission to Manage Password Policy and Credentials in the IAM User Guide.

To get your access key ID and secret access key

  1. Open the IAM console.

  2. From the navigation menu, click Users.

  3. Select your IAM user name.

  4. Click User Actions, and then click Manage Access Keys.

  5. Click Create Access Key.

    Your keys will look something like this:

    • Access key ID example: AKIAIOSFODNN7EXAMPLE

    • Secret access key example: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY

  6. Click Download Credentials, and store the keys in a secure location.

Important

Your secret key will no longer be available through the AWS Management Console; you will have the only copy. Keep it confidential in order to protect your account, and never email it. Do not share it outside your organization, even if an inquiry appears to come from AWS or Amazon.com.

No one who legitimately represents Amazon will ever ask you for your secret key.

Related topics

Setting AWS Credentials

Before you can use the AWS SDK for Ruby to make a call to an AWS service, you must set the AWS access credentials that the SDK will use to verify your access to AWS services and resources.

The AWS SDK for Ruby searches for credentials in the following order:

You can override these settings in your code. The precedence is:

The following sections describe the various ways you can set credentials, starting with the most flexible approach. For more information about AWS credentials and recommended approaches for credential management, see AWS Security Credentials in the Amazon Web Services General Reference.

Setting Shared Credentials

Set shared credentials in the AWS credentials profile file on your local system.

On Unix-based systems, such as Linux or OS X, this file is located in the following location.

~/.aws/credentials

On Windows, this file is located in the following location.

%HOMEPATH%\.aws\credentials

This file must have the following format, where default is the name of the default configuration profile given to these credentials, your_access_key_id is the value of your access key, and your_secret_access_key is the value of your secret access key.

[default] aws_access_key_id = your_access_key_id aws_secret_access_key = your_secret_access_key

Setting Credentials Using Environment Variables

Set the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables.

Use the export command to set these variables on Unix-based systems, such as Linux or OS X. The following example sets the value of your access key to your_access_key_id and the value of your secret access key to your_secret_access_key.

export AWS_ACCESS_KEY_ID=your_access_key_id export AWS_SECRET_ACCESS_KEY=your_secret_access_key

To set these variables on Windows, use the set command, as shown in the following example.

set AWS_ACCESS_KEY_ID=your_access_key_id set AWS_SECRET_ACCESS_KEY=your_secret_access_key

Setting Credentials Using Aws.config

Set the credentials in your code by updating the values in the Aws.config hash.

The following example sets the value of your access key to your_access_key_id and the value of your secret access key to your_secret_access_key. Any client or resource you create subsequently will use these credentials.

Aws.config.update({ credentials: Aws::Credentials.new('your_access_key_id', 'your_secret_access_key') })

Setting Credentials in a Client Object

Set the credentials in your code by specifying them when you create an AWS client.

The following example creates an Amazon S3 client using the access key your_access_key_id and the secret access key your_secret_access_key.

s3 = Aws::S3::Client.new( access_key_id: 'your_access_key_id', secret_access_key: 'your_secret_access_key' )

Setting Credentials Using IAM

For an Amazon Elastic Compute Cloud instance, create an AWS Identity and Access Management role, and then give your Amazon EC2 instance access to that role. For more information, see IAM Roles for Amazon EC2 in the Amazon EC2 User Guide for Linux Instances or IAM Roles for Amazon EC2 in the Amazon EC2 User Guide for Windows Instances.

Creating an AWS STS Access Token

Use the Aws::AssumeRoleCredentials method to create an AWS Security Token Service (AWS STS) access token.

The following example uses an access token to create an Amazon S3 client object, where linked::account::arn is the Amazon Resource Name (ARN) of the role to assume and session-name is an identifier for the assumed role session.

role_credentials = Aws::AssumeRoleCredentials.new( client: Aws::STS::Client.new, role_arn: "linked::account::arn", role_session_name: "session-name" ) s3 = Aws::S3::Client.new(credentials: role_credentials)

Setting a Region

You need to set a region when using most AWS services. You can set the AWS Region in ways similar to setting your AWS credentials. The AWS SDK for Ruby searches for a region in the following order:

The rest of this section describes how to set a region, starting with the most flexible approach.

Setting the Region Using Environment Variables

Set the region by setting the AWS_REGION environment variable.

Use the export command to set this variable on Unix-based systems, such as Linux or OS X. The following example sets the region to us-west-2.

export AWS_REGION=us-west-2

To set this variable on Windows, use the set command. The following example sets the region to us-west-2.

set AWS_REGION=us-west-2

Setting the Region Using Aws.config

Set the region by adding a region value to the Aws.config hash. The following example updates the Aws.config hash to use the us-west-1 region.

Aws.config.update({region: 'us-west-1'})

Any clients or resources you subsequently create are bound to this region.

Setting the Region in a Client or Resource Object

Set the region when you create an AWS client or resource. The following example creates an Amazon S3 resource object in the us-west-1 region.

s3 = Aws::S3::Resource.new(region: 'us-west-1')

Setting a Nonstandard Endpoint

If you need to use a nonstandard endpoint in the region you've selected, add an endpoint entry to Aws.config or set the endpoint: when creating a service client or resource object. The following example creates an Amazon S3 resource object in the other_endpoint endpoint.

s3 = Aws::S3::Resource.new(endpoint: other_endpoint)