* `dry_run` - (Optional, Bool) Whether the request is a dry run only.true: dry run only. The request will not create instance(s). A dry run can check whether all the required parameters are specified, whether the request format is right, whether the request exceeds service limits, and whether the specified CVMs are available. If the dry run fails, the corresponding error code will be returned.If the dry run succeeds, the RequestId will be returned.false (default value): send a normal request and create instance(s) if all the requirements are met.
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