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Note

AWS CloudFormation does not support calling its API with an IAM role.You must call the AWS

CloudFormation API as a regular IAM user.

Walkthrough: Using IAM Roles to Retrieve an

Amazon S3 Object from an EC2 Instance

In this walkthrough, we'll begin with a program that retrieves an object from Amazon S3 using regular

account credentials.Then, we'll modify it to use IAM roles for EC2 instances.

Sample Program with Credentials

Here is our starting program, which retrieves an object from an Amazon S3 bucket.The following code

explicitly specifies credentials in the call to the Amazon S3 client constructor.

require 'rubygems'

require 'aws-sdk'

s3 = AWS::S3.new(

:access_key_id => 'AKIAIOSFODNN7EXAMPLE',

:secret_access_key => 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY')

bucket_name = 'text-content'

obj_name = 'text-object.txt'

document = s3.buckets[bucket_name].objects[obj_name]

File.open(obj_name, "w") do |f|

f.write(document.read)

end

puts "'#{obj_name}' copied from S3."

To test the program locally

1. Substitute your AWS credentials for the values of :access_key_id and :secret_access_key.

2. Substitute the names of an Amazon S3 bucket and text object associated with your AWS account

for the values of bucket_name and obj_name, respectively.

For instructions about how to create an Amazon S3 bucket and upload an object, see the Amazon

Simple Storage Service Getting Started Guide.

3. Run the program with the AWS SDK for Ruby and a Ruby interpreter. For information about setting

up the SDK, see Getting Started (p. 4).

For example, if you've saved the code in a file called get-object.rb, run it by using cd on the

command-line (terminal) to change to the directory in which you saved the file, and then type ruby

get-object.rb.

Version v1.0.0

AWS SDK for Ruby Developer Guide

Walkthrough: Using IAM Roles to Retrieve an Amazon

S3 Object from an EC2 Instance

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