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    <p>The best way is to use <a href="http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UsingIAM.html#UsingIAMrolesWithAmazonEC2Instances">instance profiles</a>. The basic idea is:</p> <ul> <li>Create an instance profile</li> <li>Create a new IAM role</li> <li><p>Assign a policy to the previously created role, for example:</p> <p>{ "Statement": [ { "Sid": "Stmt1369049349504", "Action": "sqs:<em>", "Effect": "Allow", "Resource": "</em>" } ] }</p></li> <li><p>Associate the role and instance profile together.</p></li> <li>When you start a new EC2 instance, make sure you provide the instance profile name.</li> </ul> <p>If all works well, and the library you use to connect to AWS services from within your EC2 instance supports retrieving the credentials from the instance meta-data, your code will be able to use the AWS services.</p> <p>A complete example taken from the boto-user mailing list:</p> <p>First, you have to create a JSON policy document that represents what services and resources the IAM role should have access to. for example, this policy grants all S3 actions for the bucket "my_bucket". You can use whatever policy is appropriate for your application.</p> <pre><code>BUCKET_POLICY = """{ "Statement":[{ "Effect":"Allow", "Action":["s3:*"], "Resource":["arn:aws:s3:::my_bucket"]}]}""" </code></pre> <p>Next, you need to create an Instance Profile in IAM.</p> <pre><code>import boto c = boto.connect_iam() instance_profile = c.create_instance_profile('myinstanceprofile') </code></pre> <p>Once you have the instance profile, you need to create the role, add the role to the instance profile and associate the policy with the role.</p> <pre><code>role = c.create_role('myrole') c.add_role_to_instance_profile('myinstanceprofile', 'myrole') c.put_role_policy('myrole', 'mypolicy', BUCKET_POLICY) </code></pre> <p>Now, you can use that instance profile when you launch an instance:</p> <pre><code>ec2 = boto.connect_ec2() ec2.run_instances('ami-xxxxxxx', ..., instance_profile_name='myinstanceprofile') </code></pre>
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    1. POWhat's the best method for passing AWS credentials as user data to an EC2 instance?
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    1. COIsn't boto a python module created to make easy API access to AWS? How would you do this in a language independant manner, i.e. in a cloud template?
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