When you add a ramdisk to Walrus, you bundle the ramdisk file,
upload the file to a bucket in Walrus that you name, and then
register the ramdisk with Eucalyptus.
To add a ramdisk to Walrus:
Example
For example:
euca-bundle-image -i euca-fedora-10-x86_64/xen-kernel/initrd-2.6.27.21-0.1-xen --ramdisk true
...
Generating manifest /tmp/initrd-2.6.27.21-0.1-xen.manifest.xml
euca-upload-bundle -b example_rd_bucket -m /tmp/initrd-2.6.27.21-0.1-xen.manifest.xml
...
Uploaded image as example_rd_bucket/initrd-2.6.27.21-0.1-xen.manifest.xm
euca-register example_rd_bucket/initrd-2.6.27.21-0.1-xen.manifest.xml
IMAGE eri-XXXXXXXX
Where the returned value eri-XXXXXXXX is the
unique ID of the registered ramdisk image.