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How to force devstack to test solutions provided by "Xen_via_libvirt_for_OpenStack_juno" ? "

asked 2015-03-31 12:48:43 -0500

dbaxps gravatar image

I would like to test via AIO install on Ubuntu 14.04.2 via devstack ( How to write local.conf forcing load nova-compute-xen and make following changes to nova.conf :-


I understand that having Ubuntu 14.04.2 prepared to run Xen 4.4.1 Dom0 and qemu 2.0.2 patched as suggested in link above and installed , it is possible update nova.conf , then shutdown system && restart via ./ . I don't know what nova-compute-xen specific features supposed to be , wouldn't an attempt to run just nova-compute be misleading step ?

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answered 2015-04-01 01:50:47 -0500

dbaxps gravatar image

updated 2015-04-03 09:58:06 -0500

UPDATE as of 04/03/2015
During run right after cloning /opt/stack/nova
reverted commit Add handling for offlined CPUs to the nova libvirt driver
Nova-compute starts with no problems. Getting same errors trying launch instance

libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: /etc/xen/scripts/vif-bridge online [-1] exited with error status 1
libxl: error: libxl_device.c:1085:device_hotplug_child_death_cb: script: ip link set vif10.0 name tap1c16ef17-68 failed
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0x7f4dd0793b80: deregister unregistered
libxl: error: libxl_create.c:1226:domcreate_attach_vtpms: unable to add nic devices

UPDATE as of 04/02/2015
Current status of issue with libvirt-xen-driver

UPDATE as of 04/01/2015
View recently suggested way to manage

This approach was tested on Ubuntu 14.04.2 running on bare metal
and finally I was hit by bug in progress :-

nova can't start with libvirt-xen driver Target milestone kilo-rc1
Trace obtained by me uploaded here

Dear Sir,
Thank you very much your feedback , however it's addressing a question having nothing in common with  the one I asked. Would  I like manage via installing XENAPI on Compute Node for Official XenServer 6.X, I would just follow link

Idea to deal with outdated script for devstack would never come to my mind,
if I would be able manage with RDO Juno on Compute Node. I saw this script a while ago.

Please, take a look at and see that suggested approach is completely different. Xing Lin configured nova.conf as follows :-


Using OpenSource Xen 4.4.0 (4.4.1 just coming with Trusty works as well) he is pretty much focused on patching Qemu 2.0.2, what means that VMs would be created would be HVM domUs from Xen standpoint.
Another his special move is installing nova-compute-xen on Compute node. Package which was designed for Ubuntu && Debian only. I also realize that standard Qemu/KVM/LIbvirt driver would provide much better performance then Xen 4.4.1 HVMs. That's a reason why RH wouldn't be interested in porting nova-compute-xen to Fedora. See also

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answered 2015-03-31 16:23:37 -0500

The links below are probably going to point you in the right direction as im sure there are multiple changes you would need to make.

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Asked: 2015-03-31 12:48:43 -0500

Seen: 1,276 times

Last updated: Apr 03 '15