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Amazon Machine Image
An Amazon Machine Image (AMI) is a special type of virtual appliance that is used to instantiate (create) a virtual machine within the Amazon Elastic Compute Cloud ("EC2"). It serves as the basic unit of deployment for services delivered using EC2.〔(【引用サイトリンク】title=Amazon EC2 Functionality )〕
== Contents ==
Like all virtual appliances, the main component of an AMI is a read-only filesystem image that includes an operating system (e.g., Linux, Unix, or Windows) and any additional software required to deliver a service or a portion of it.〔(【引用サイトリンク】title=Creating an Image )〕
The AMI filesystem is compressed, encrypted, signed, split into a series of 10 MB chunks and uploaded into Amazon S3 for storage. An XML manifest file stores information about the AMI, including name, version, architecture, default kernel id, decryption key and digests for all of the filesystem chunks.
An AMI does not include a kernel image, only a pointer to the default kernel id, which can be chosen from an approved list of safe kernels maintained by Amazon and its partners (e.g., Red Hat, Canonical, Microsoft). Users may choose kernels other than the default when booting an AMI.〔(AWS Blog post announcing EC2 User Selectable Kernels )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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