|Image Management Guide|
An image defines what will run on a guest instance with your Eucalyptus cloud. Typically, an image contains one of the Linux distributions like CentOS, Fedora, Ubuntu, Debian or others. It could also contain one of the supported Windows server versions. The format for these is identical.
Normally when we use the term "image" we mean the root file system. Once bundled, uploaded, and registered with Eucalyptus, such an image is known as a Eucalyptus machine image (EMI).
There are, however, other types of images that support the EMI. They are the kernel (EKI) and ramdisk (ERI). They contain kernel modules necessary for proper functioning of the image. Often, one set of these ERIs and EKIs are used by multiple EMIs. Once loaded into the Eucalyptus cloud, the EKI and ERI are referred to by the image and you don't have much interaction with them directly.
To help get you started, Eucalyptus provides pre-packaged virtual machines that are ready to run in your cloud. You can get them at the Eucalyptus Machine Images page. Each Eucalyptus image from this site comes bundled with a correspoding EKI and ERI. You can manually download these images from the web page, or you can use the Eualyptus Image Store commands to list and describe these images, as well as to install an image in your cloud. For more information, see Browse and Install Images from EuStore.
If you find that the pre-packaged images don't meet your needs, you can migrate an image from another cloud system (such as vSphere or Amazon Web Services) or create your own image. See the rest of this guide for more information.
Once you've created or downloaded the image(s) you plan to use, you can bundle, upload and register the images with your Eucalyptus cloud.