Configuring OpenStack to Use the Xen Project Hypervisor

OpenStack and Xen

Stefano Stabellini & Anthony Perard

Feb 2015

2014 Citrix. Confidential. 2

Why Xen?

Xen is a type-1 hypervisor

small footprint (Less then 100K LOC)

GPLv2

Powers the largest public cloud in production (>50% of vendors listed in Gartner 2014 Cloud magic

quadrant, more in terms of hosts)


Make Xen the best hypervisor for OpenStack


OpenStack


Status and Goals

Xen via Libvirt is currently in Group C

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


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


From 0 to Xen and OpenStack What we actually did

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

5. Fix Bugs!!


Bugs

2 Xen related bug in Nova

1 Xen related bug in Libvirt

Stability issues with libvirt 1.2.2-0ubuntu13.1.8 under stress


Bugs




FIXED!


Latest Update

2 patches under review for Nova

1 patch upstream in Libvirt

everything works out of the box! Using the latest OpenStack and libvirt trees

Tempest runs and *all* tests pass!


Tuning OpenStack and Xen

Dom0 Memory: 1-4G dom0_mem=1024M

Dom0 vcpus: 4 dom0_max_vcpus=4 dom0_vcpus_pin

use LVM for local storage VOLUME_GROUP=volume_group_name

PV vs HVM guests nova image-meta set vm_mode=HVM

nova image-meta delete vm_mode


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


Questions?


WORK BETTER. LIVE BETTER.

Configuring OpenStack to Use the Xen Project Hypervisor

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