Configuring OpenStack to Use the Xen Project Hypervisor

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Stefano Stabellini and Anthony Perard discuss and demonstrate how to use Xen Project in OpenStack. Talk is from FOSDEM 2015 in February.

Technologie

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)

© 2014 Citrix. Confidential.3
Make Xen the best hypervisor for OpenStack

© 2014 Citrix. Confidential.10
OpenStack

© 2014 Citrix. Confidential.11
OpenStack

© 2014 Citrix. Confidential.12
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

© 2014 Citrix. Confidential.13
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

© 2014 Citrix. Confidential.14
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!!

© 2014 Citrix. Confidential.15
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

© 2014 Citrix. Confidential.16
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
FIXED!

© 2014 Citrix. Confidential.17
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
FIXED!

© 2014 Citrix. Confidential.18
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!

© 2014 Citrix. Confidential.19
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

© 2014 Citrix. Confidential.20
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

© 2014 Citrix. Confidential.22
Questions?

© 2014 Citrix. Confidential.23
WORK BETTER. LIVE BETTER.

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Configuring OpenStack to Use the Xen Project Hypervisor

1. OpenStack and Xen Stefano Stabellini & Anthony Perard Feb 2015

2. © 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)

12. © 2014 Citrix. Confidential.12 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

13. © 2014 Citrix. Confidential.13 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

14. © 2014 Citrix. Confidential.14 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!!

18. © 2014 Citrix. Confidential.18 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!

19. © 2014 Citrix. Confidential.19 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

20. © 2014 Citrix. Confidential.20 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

21. Demo

Configuring OpenStack to Use the Xen Project Hypervisor

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