AWS SDK for Ruby - V2

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This repository contains the code for the V2 AWS SDK for Ruby. For v1 of the AWS SDK for Ruby, see aws/aws-sdk-ruby.

Links of Interest

V2 Preview Release

The V2 AWS SDK for Ruby is currently available as a preview-release. The code is organized into multiple gems. Installing the preview release of aws-sdk will install two other gems:

  • aws-sdk - preview
  • aws-sdk-resources - preview
  • aws-sdk-core - stable

Note: Version 2 of the AWS SDK for Ruby requires Ruby 1.9.3+

Using V1 and V2 Together

Version 2 uses a the Aws namespace, allowing it to be used in the same application as the v1 AWS SDK for Ruby.

AWS::S3 # v1
Aws::S3 # v2

Here is an example that demonstrates using V1 and V2 together:

# in Gemfile
gem 'aws-sdk-v1'
gem 'aws-sdk', '2.0.6.pre'

# in application
require 'aws-sdk-v1'
require 'aws-sdk'


To use the Ruby SDK, you must configure a region and credentials.


You can construct a service client with a region:

ec2 ='us-west-2')

Alternatively, a default region can be loaded from one of the following locations:

  • Aws.config[:region]

See this document for a list of supported regions by service.


You can construct a client with credentials like so:

s3 = credentials)

The credentials object may be an instance of:

  • Aws::Credentials
  • Aws::SharedCredentials
  • Aws::InstanceProfileCredentials
  • Aws::AssumeRoleCredentials

Default credentials are searched for in the following locations:

  • Aws.config[:credentials]
  • The shared credentials ini file at HOME/.aws/credentials
  • From an instance profile when running on EC2

Please take care to never commit credentials to source control. We strongly recommended loading credentials from an external source.

require 'json'
creds = JSON.load('secrets.json'))
creds =['AccessKeyId'], creds['SecretAccessKey'])

Clients (aws-sdk-core) - stable

Construct a service client to make API calls. Each client provides a 1-to-1 mapping of methods to API operations. Refer to the API documentation for a complete list of available methods.

# list buckets in Amazon S3
s3 =
resp = s3.list_buckets
#=> ["bucket-1", "bucket-2", ...]

API methods accept a hash of additional request parameters and return structured response data.

# list the first two objects in a bucket
resp = s3.list_objects(bucket: 'aws-sdk-core', max_keys: 2)
resp.contents.each do |object|
  puts "#{object.key} => #{object.etag}"

Paging Responses

Many AWS operations limit the number of results returned with each response. To make it easy to get the next page of results, every AWS response object is enumerable:

# yields one response object per API call made, this will enumerate
# EVERY object in the named bucket
s3.list_objects(bucket:'aws-sdk').each do |response|

If you prefer to control paging yourself, response objects have helper methods that control paging:

# make a request that returns a truncated response
resp = s3.list_objects(bucket:'aws-sdk')

resp.last_page? #=> false
resp.next_page? #=> true
resp = resp.next_page # send a request for the next response page
resp = resp.next_page until resp.last_page?


Waiters are a utility methods that poll for a particular state. To invoke a waiter, call #wait_until on a client:

  ec2.wait_until(:instance_running, instance_ids:['i-12345678'])
  puts "instance running"
rescue Aws::Waiters::Errors::WaiterFailed => error
  puts "failed waiting for instance running: #{error.message}"

Waiters have sensible default polling intervals and maximum attempts. You can configure these per call to #wait_until. You can also register callbacks that are triggered before each polling attempt and before waiting. See the API documentation for more examples and for a list of supported waiters per service.

Resources (aws-sdk-resource) - preview release

Resource interfaces are object oriented classes that represent actual resources in AWS. Resource interfaces built ontop of API clients and provide additional functionality.

s3 =

# reference an existing bucket
bucket = s3.bucket('aws-sdk')

# enumerate every object in a bucket
bucket.objects.each do |obj|
  puts "#{obj.key} => #{obj.etag}"

# batch operations, delete objects in batches of 1k
bucket.objects(prefix: '/tmp-files/').delete

# single object operations
obj = bucket.object('hello')
obj.put(body:'Hello World!')

Resource interfaces are currently in a preview period. While quite stable, expect possible minor changes before a final stable version is released. Currently there are Resource-oriented interfaces for:

  • Aws::S3
  • Aws::IAM
  • Aws::EC2 - partial
  • Aws::SQS
  • Aws::SNS
  • Aws::Glacier
  • Aws::OpsWorks
  • Aws::CloudFormation

REPL - AWS Interactive Console

The aws-sdk-core gem ships with a REPL that provides a simple way to test the Ruby SDK. You can access the REPL by running aws.rb from the command line.

$ aws.rb
Aws> ec2.describe_instances.reservations.first.instances.first
[Aws::EC2::Client 200 0.216615 0 retries] describe_instances()
 state=<struct  code=16, name="running">,

You can enable HTTP wire logging by setting the verbose flag:

$ aws.rb -v

In the REPL, every service class has a helper that returns a new client object. Simply downcase the service module name for the helper:

  • Aws::S3 => s3
  • Aws::EC2 => ec2
  • etc


This project uses semantic versioning. You can safely express a dependency on a major version and expect all minor and patch versions to be backwards compatible.

Supported Services

Service Name Service Class API Version
Auto Scaling AutoScaling 2011-01-01
AWS CloudFormation CloudFormation 2010-05-15
Amazon CloudFront CloudFront 2014-10-21
Amazon CloudHSM CloudHSM 2014-05-30
Amazon CloudSearch CloudSearch 2013-01-01
Amazon CloudSearch Domain CloudSearchDomain 2013-01-01
AWS CloudTrail CloudTrail 2013-11-01
Amazon CloudWatch CloudWatch 2010-08-01
Amazon CloudWatch Logs CloudWatchLogs 2014-03-28
AWS CodeDeploy CodeDeploy 2014-10-06
Amazon Cognito Identity CognitoIdentity 2014-06-30
Amazon Cognito Sync CognitoSync 2014-06-30
AWS Config ConfigService 2014-10-17
AWS Data Pipeline DataPipeline 2012-10-29
AWS Direct Connect DirectConnect 2012-10-25
Amazon DynamoDB DynamoDB 2012-08-10
Amazon Elastic Compute Cloud EC2 2014-10-01
Amazon EC2 Container Service ECS 2014-11-13
Amazon ElastiCache ElastiCache 2014-09-30
AWS Elastic Beanstalk ElasticBeanstalk 2010-12-01
Elastic Load Balancing ElasticLoadBalancing 2012-06-01
Amazon Elastic Transcoder ElasticTranscoder 2012-09-25
Amazon Elastic MapReduce EMR 2009-03-31
Amazon Glacier Glacier 2012-06-01
AWS Identity and Access Management IAM 2010-05-08
AWS Import/Export ImportExport 2010-06-01
Amazon Kinesis Kinesis 2013-12-02
AWS Key Management Service KMS 2014-11-01
AWS Lambda Lambda 2014-11-11
AWS OpsWorks OpsWorks 2013-02-18
Amazon Relational Database Service RDS 2014-10-31
Amazon Redshift Redshift 2012-12-01
Amazon Route 53 Route53 2013-04-01
Amazon Route 53 Domains Route53Domains 2014-05-15
Amazon Simple Storage Service S3 2006-03-01
Amazon Simple Email Service SES 2010-12-01
Amazon SimpleDB SimpleDB 2009-04-15
Amazon Simple Notification Service SNS 2010-03-31
Amazon Simple Queue Service SQS 2012-11-05
AWS Storage Gateway StorageGateway 2013-06-30
AWS Security Token Service STS 2011-06-15
AWS Support Support 2013-04-15
Amazon Simple Workflow Service SWF 2012-01-25


This library is distributed under the apache license, version 2.0

copyright 2013. amazon web services, inc. all rights reserved.

licensed under the apache license, version 2.0 (the "license");
you may not use this file except in compliance with the license.
you may obtain a copy of the license at

unless required by applicable law or agreed to in writing, software
distributed under the license is distributed on an "as is" basis,
without warranties or conditions of any kind, either express or implied.
see the license for the specific language governing permissions and
limitations under the license.