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launch_block_device_mappings([]BlockDevice) - Add one or more block devices before the Packer build starts. If you add instance store volumes or EBS volumes in addition to the root device volume, the created AMI will contain block device mapping information for those volumes. Amazon creates snapshots of the source instance's root volume and any other EBS volumes described here. When you launch an instance from this new AMI, the instance automatically launches with these additional volumes, and will restore them from snapshots taken from the source instance.In addition to the fields available in ami_block_device_mappings, you may optionally use the following field:
omit_from_artifact(boolean) - If true, this block device will not be snapshotted and the created AMI will not contain block device mapping information for this volume. If false, the block device will be mapped into the final created AMI. Set this option to true if you need a block device mounted in the surrogate AMI but not in the final created AMI.