OpenStack Configuration Example

The SUSE Cloud project contains a fully operational OpenStack implementation for Xen Project. It is an example of how to successfully employ Xen Project in OpenStack. This page attempts to document the Xen Project-specific configuration elements as an example of what a functional implementation might look like. As such, this page is less a "How To" and more a "What Is".

Where to Find the Configuration Files

The bulk of the Xen Project-specific entries will be in the Barclamp section of the Nova project within OpenStack. Most of these files can be found in the following trees:

• https://github.com/crowbar/barclamp-nova/blob/master/chef/cookbooks/nova/recipes/
• https://github.com/crowbar/barclamp-nova/blob/master/chef/cookbooks/nova/templates/default/

Recipes files

The following are the Xen Project-specific segments from compute.rb configuration file:

def set_boot_kernel_and_trigger_reboot(flavor='default')
# only default and xen flavor is supported by this helper right now
default_boot = 0
current_default = nil
# parse menu.lst, to find boot index for selected flavor
File.open('/boot/grub/menu.lst') do |f|
f.lines.each do |line|
current_default = line.scan(/\d/).first.to_i if line.start_with?('default')
if line.start_with?('title')
if flavor.eql?('xen')
# found boot index
break if line.include?('Xen')
else
# take first non-xen kernel as default
break unless line.include?('Xen')
end
default_boot += 1
end
end
end