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Deploying OpenStack
book

Deploying OpenStack

by Ken Pepple
July 2011
Intermediate to advanced content levelIntermediate to advanced
88 pages
1h 52m
English
O'Reilly Media, Inc.
Content preview from Deploying OpenStack

Image Support

Glance supports a wide array of virtual disk and container formats. Virtual disks are analogous to a physical server’s boot drives, only condensed into a file. Different virtualization technologies support different disk formats. Glance supports the disk formats shown in Table 3-2.

Table 3-2. Glance Supported Disk Formats

Disk FormatNotes
RawUnstructured disk format
VHDMost common format supported by most OpenStack virtualization technologies except KVM.
VMDKFormat popularized by VMware.
qcow2

QEMU image format, native format for KVM and QEMU. Supports advanced functions.

VDI

Virtual disk image format originated by Oracle VM VirtualBox.

ISOArchive format for optical disks.
AMI, ARI, AKI

Amazon machine, ramdisk, and kernel images (respectively). See more information at the Amazon EC2 User Guide.

Glance also supports the concept of container formats, which describes the file format and contains additional metadata. Glance supports two container formats as well as the absence of a container format (bare), as shown in Table 3-3.

Table 3-3. Glance Container Formats

Container FormatNotes
OVF

An open standard for distributing one or more virtual machine images. Read more about this standard at http://www.dmtf.org/standards/ovf.

aki, ari, ami

Amazon kernel, ramdisk, or machine image (respectively). Read more about these container formats at Amazon EC2 User Guide.

BareNo container for this image.
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Publisher Resources

ISBN: 9781449311223Errata