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feat(client-ec2): This release changes the CreateLaunchTemplate, CreateLaunchTemplateVersion, ModifyLaunchTemplate CLI and SDKs such that if you do not specify a client token, a randomly generated token is used for the request to ensure idempotency.
* attach to the instance at launch. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html">Block device mappings
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* for volumes on Amazon EC2 instances</a> in the <i>Amazon EC2 User
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* Guide</i>.</p>
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* <p>To override a block device mapping specified in the launch template:</p>
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* <ul>
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* <li>
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* <p>Specify the exact same <code>DeviceName</code> here as specified in the launch
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* template.</p>
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* </li>
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* <li>
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* <p>Only specify the parameters you want to change.</p>
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* </li>
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* <li>
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* <p>Any parameters you don't specify here will keep their original launch template
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* values.</p>
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* </li>
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* </ul>
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* <p>To add a new block device mapping:</p>
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* <ul>
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* <li>
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* <p>Specify a <code>DeviceName</code> that doesn't exist in the launch
* <p>Unique, case-sensitive identifier you provide to ensure the idempotency of the
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* request. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Run_Instance_Idempotency.html">Ensuring idempotency
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* in Amazon EC2 API requests</a>.</p>
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* request. If a client token isn't specified, a randomly generated token is used in the request to ensure idempotency.</p>
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* <p>For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Run_Instance_Idempotency.html">Ensuring
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* idempotency</a>.</p>
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* <p>Constraint: Maximum 128 ASCII characters.</p>
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