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Note

You must have specified default credentials in at least one of these ways, or the attempt will fail.

For more information, see Setting up AWS Credentials (p. 5).

Specifying a Credentials Provider

If you don't want to use the default credentials provider, you can specify your preferred credentials provider.

For example, you might want to use a nondefault profile from the credentials file, which is handled by

SharedCredentialFileProvider.You can specify a credentials provider as follows:

• To specify a credentials provider for a particular service, pass a provider object to the service's client

constructor, which must take a class with the Provider interface as input. A provider typically has options

that you can use to specify a particular set of credentials.

The following example directs the Amazon S3 client constructor to get its credentials from the

SharedCredentialFileProvider object, which loads credentials from the credentials file.

# Create a new S3 object using a specific provider

s3 = AWS::S3.new(

:credential_provider => AWS::Core::CredentialProviders::SharedCredentialFile

Provider.new)

Creating the provider object with the default constructor specifies the credentials file's default profile.

You can also use the constructor's profile_name option to specify a profile by name or its path

option to specify a nondefault credentials file location.

• You can specify a credential provider that will be used by all service clients by passing a provider object

to the AWS.config method. The following example specifies the default profile from the credentials file

for all services.

AWS.config(

:credential_provider => AWS::Core::CredentialProviders::SharedCredentialFile

Provider.new)

# Create a new S3 object

s3 = AWS::S3.new

You can then use the Amazon S3 client object's default constructor, which automatically loads the

appropriate profile.

For the full list of SDK for Ruby credential provider classes, see AWS::Core::CredentialProviders. In the

SDK for Ruby, all provider classes mix in the Provider interface.

Tip

You can also use this approach to supply your own credentials provider. Just implement a

credentials provider class that mixes in the Provider interface.You can then pass an instance

of the class to a service's client class constructor or to AWS.config, as described above.

Explicitly Specifying Credentials

You can specify credentials explicitly as follows.

• Specify credentials for a particular service by using the client class constructor's :access_key_id

and :secret_access_key options.

The following example specifies an explicit set of credentials for the Amazon S3 client object.

Version v1.0.0

AWS SDK for Ruby Developer Guide

Specifying a Credentials Provider

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