Once you have your OpenStack cluster up and running you will need to either find some pre-created image templates or you may decide that you want to roll your own.  I’ll leave the details of creating images from scratch for a different post, this post will focus on providing links to both image files and instructions for installing pre-created Linux templates on OpenStack infrastructure.

First, if you are looking to install any version of Ubuntu, you should visit

http://uec-images.ubuntu.com/releases/

and download the file that corresponds to your desired version and architecture.

Once you have that file, you can follow the instructions here.

If you are looking to install a version of Debian, CentOS or Fedora, you should visit

http://open.eucalyptus.com/wiki/EucalyptusUserImageCreatorGuide_v1.6,

and download one of pre-created images that the folks over at Eucalyptus have provided.

Once you have are ready to install one of those files, you can follow the instructions here.