The document discusses efforts to improve Xen as a hypervisor for OpenStack. It notes goals of making Xen a good platform for OpenStack production and development. In January 2015, Xen via Libvirt was in group C of the OpenStack integration classification, with no automated testing working. By June 2015, significant progress had been made, with Xen via Libvirt reaching group B, all Tempest tests passing on the latest OpenStack and libvirt trees. The Xen Project now has an OpenStack CI loop for automated testing with voting rights. Instructions are provided for deploying OpenStack on Xen using DevStack.

1. OpenStack and Xen
Stefano Stabellini
August 2015

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Make Xen the best hypervisor for OpenStack

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OpenStack

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OpenStack

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OpenStack

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OpenStack

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OpenStack

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OpenStack

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OpenStack

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OpenStack

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Goals
• Xen should be a great platform for OpenStack production deployments
• Get Xen via Libvirt in Group A within 1 year
• Xen should be a great platform for OpenStack development and hacking
• devstack should deploy Xen and OpenStack

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Status and Progress
Jan 2015: Xen via Libvirt still in Group C
• No automated testing at all
• Bugs in Nova and Libvirt prevented OpenStack
from working out of the box with Xen via Libvirt
• Tempest could not be run on OpenStack with Xen via Libvirt

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Status and progress
Jun 2015: Xen via Libvirt is in Group B
• everything works out of the box!
Using the latest OpenStack and libvirt trees
• Tempest runs and *all* tests pass!
• The Xen Project CI-loop is up and running
• The Xen Project CI-loop has voting rights

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Xen Project OpenStack CI-loop
http://jenkins.openstack.xenproject.org
http://wiki.xenproject.org/wiki/
OpenStack_CI_Loop_for_Xen-Libvirt

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Xen Project OpenStack CI-loop
What it means to be “voting”
http://review.openstack.org

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From 0 to Xen and OpenStack
1. Install Ubuntu 14.04 LTS
2. Install Xen
apt-get install xen-hypervisor-4.4-amd64
3. git clone devstack && configure it to use Xen
LIBVIRT_TYPE=xen
4. ./stack.sh

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Tuning OpenStack and Xen
• Dom0 Memory: 1-4G
dom0_mem=2048M
• Dom0 vcpus: 4
dom0_max_vcpus=4 dom0_vcpus_pin
• use LVM for local storage
volume_group=<volume_group_name> # /etc/cinder/cinder.conf
• PV vs HVM guests
nova image-meta set vm_mode=HVM
nova image-meta delete vm_mode

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More information
www.xenproject.org
wiki.xenproject.org
wiki.xenproject.org/wiki/Tuning_Xen_for_Performance
wiki.xenproject.org/wiki/OpenStack
http://lists.xenproject.org/mailman/listinfo/xen-devel

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OpenStack Working Group
We need help!
http://lists.xenproject.org/mailman/listinfo/wg-openstack

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Questions?

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WORK BETTER. LIVE BETTER.