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109 lines
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Copyright 2011 OpenStack Foundation
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All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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Disk and Container Formats
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==========================
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When adding an image to Glance, you must specify what the virtual
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machine image's *disk format* and *container format* are. Disk and container
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formats are configurable on a per-deployment basis. This document intends to
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establish a global convention for what specific values of *disk_format* and
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*container_format* mean.
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Disk Format
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-----------
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The disk format of a virtual machine image is the format of the underlying
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disk image. Virtual appliance vendors have different formats for laying out
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the information contained in a virtual machine disk image.
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You can set your image's disk format to one of the following:
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* **raw**
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This is an unstructured disk image format
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* **vhd**
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This is the VHD disk format, a common disk format used by virtual machine
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monitors from VMWare, Xen, Microsoft, VirtualBox, and others
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* **vmdk**
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Another common disk format supported by many common virtual machine monitors
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* **vdi**
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A disk format supported by VirtualBox virtual machine monitor and the QEMU
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emulator
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* **iso**
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An archive format for the data contents of an optical disc (e.g. CDROM).
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* **qcow2**
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A disk format supported by the QEMU emulator that can expand dynamically and
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supports Copy on Write
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* **aki**
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This indicates what is stored in Glance is an Amazon kernel image
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* **ari**
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This indicates what is stored in Glance is an Amazon ramdisk image
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* **ami**
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This indicates what is stored in Glance is an Amazon machine image
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Container Format
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----------------
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The container format refers to whether the virtual machine image is in a
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file format that also contains metadata about the actual virtual machine.
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Note that the container format string is not currently used by Glance or
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other OpenStack components, so it is safe to simply specify **bare** as
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the container format if you are unsure.
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You can set your image's container format to one of the following:
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* **bare**
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This indicates there is no container or metadata envelope for the image
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* **ovf**
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This is the OVF container format
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* **aki**
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This indicates what is stored in Glance is an Amazon kernel image
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* **ari**
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This indicates what is stored in Glance is an Amazon ramdisk image
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* **ami**
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This indicates what is stored in Glance is an Amazon machine image
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* **ova**
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This indicates what is stored in Glance is an OVA tar archive file
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