Category Archives: User Story

A user explains how they employ Xen Project software

Mirage Project Proposal for Community Review

The OpenMirage project is seeking to become a hosted project, as defined in the Xen Governance process. To become a hosted project, a project proposal is needed that is first submitted for community review. The review is followed by a vote by eligible community members, which if successfull adds the project to the incubator. The project can then graduate as outlined in the Xen Governance process.

I posted the proposal for community review on the xen mailing lists earlier this week: the community review is open 23:59 (GMT), 27th of Jan, 2013.

What is Open Mirage?

The following recording of a XenSummit presentation by Anil Madhavapeddy, the Mirage project lead, introduces the project, explains why it is relevant to and concludes with some interesting benchmarks and discussion.

Continue reading Security Policy Update: Get Involved recently released a number of (related) security updates, XSA-7 through to -9. This was done by the Security Team who are charged with following the Security Problem Response Process.

As part of the process of releasing XSA-7..9 several short-comings (a few of which Ian Jackson has discussed already in Security vulnerabilities – the coordinated disclosure sausage mill) were found in the process.

In order to address these short-comings we have started a discussion on the xen-devel mailing list which describes the issues which we faced and proposes some potential options for updates. However this process is supposed to serve you, the Xen user community, and therefore your feedback and input is critical to ensuring that the policy meets the needs of the community.

So whether you are a small or large consumer of Xen you should feel free to have your say and to help formulate an updated policy which best serves the needs of the community. To take part in the discussion please send mail to

Letting the community know about Kronos

Now that we’ve got a page with instructions for Kronos on Oneiric (XAPI on Ubuntu), I was wondering about ways to let the community know that things are progressing. I’ve started with the simple step of adding some detail to the Xen page on the Ubuntu Community Documentation site, noting the availability of the new page. It could do with a good clear-out, but I don’t want to do that until we’ve got more, and better tested, instructions on the site.

Any other ideas are very welcome.

Xen Summit / Xen Directions Asia 2010

As many of you know, XenSummit Asia 2010, originally planned for Nov 3-4 in Seoul, Korea, is being postponed. The current plan is to push back the event by about a month, and possibly expand it to include a user “XenDirections” track.

Until we hire a new community community manager, I will be the main Citrix contact for this event.

To help us plan, I’ve put together a survey, which can be found here. If you’re possibly interested in attending either a developer summit or a user event, please fill it out; and pass it along to people you know who may be interested.

Xen – KVM – Linux – and the Community

At Xen Summit last week, several community members and I discussed the issues around the recent launch of RHEL without Xen and its implications for Xen and the community. I thought that I would share my opinions with a wider audience via this blog and hopefully get feedback from the Xen community on this important topic. So, feel free to comment on this post or send me mail privately if you wish to express your opinion to just me.

Firstly, I would like to offer my congratulations to the KVM community for the successful launch of their solution in Red Hat 6 shipping later this year. We in the community are very supportive of all open source projects and believe that innovations made in the Linux kernel for virtualization can equally be shared by KVM and Xen developers to further improve open source virtualization hypervisors. I look forward to KVM and Xen working together to ensure interoperability, common formats, and management interfaces to provide customers with the maximum flexibility in moving virtual machines between hypervisors as well as simplifying overall virtualization management infrastructure. is currently promoting the DMTF management standard for virtualization and cloud computing and welcome the KVM community to join with us by leveraging our OVF and DMTF SVPC implementations.

Many Linux community members and technology press have been busy the past few weeks writing off Xen as no longer relevant based on the launch of KVM. I have enjoyed reading the many articles written about this and thought I would add some insight to help customers, companies, and journalists better understand the differences between KVM and Xen. KVM is a type-2 hypervisor built into the Linux kernel as a module and will ship with any Linux distribution moving forward as no work is required for the Linux distributions to add KVM. Having a virtualization platform built-in to the Linux kernel will be valuable to many customers looking for virtualization within a Linux based infrastructure; however these customers will lose the flexibility to run a bare-metal hypervisor, configure the hypervisor independent of the host operating system, and provide machine level security as a guest can bring down the operating system on KVM. Xen, on the other hand is a type-1 hypervisor built independent of any operating system and is a complete separate layer from the operating system and hardware and is seen by the community and customers as an Infrastructure Virtualization Platform to build their solutions upon. In fact, the community is not in the business of building a complete solution, but rather a platform for companies and users to leverage for their virtualization and cloud solutions. In fact, the Xen hypervisor is found in many unique solutions today from standard server virtualization to cloud providers to grid computing platforms to networking devices, etc.

To get a better understanding of how operates, you must understand what the mission and goal of the community is:

  • Build the industry standard open source hypervisor
    • Core “engine” in multiple vendor’s products
  • Maintain Xen’s industry leading performance
    • First to exploit new hardware virtualization features
  • Help OS vendors paravirtualize their OSes
  • Maintain Xen’s reputation for stability and quality
  • Support multiple CPU types for large and small systems
  • Foster innovation
  • Drive interoperability

This mission statement has been in place for many years in and is an accurate reflection of our community.  It is our most important mission to create an industry standard open source hypervisor that is a core engine in other vendor’s products. Clearly, has succeeded in this mission as many companies including Amazon, GoGrid, RackSpace, Novell, Oracle, Citrix, Avaya, Fujitsu, VA Linux, and others are leveraging our technology as a core feature in their solutions. It is not the intention of to build a competitive packaged solution for the marketplace, but rather create a best of breed open source technology that is available for anyone to leverage.  This distinction is critical to understand as many people are confused as to why does not compete or market against other technologies such as VMWare, HyperV, and KVM. Our goal is to create the best hypervisor possible without any focus on creating a complete packaged solution for customers. We embrace the open model of allowing customers to choose from various solutions to create their optimal solution. also spends a great deal of developer effort in performance testing as well as ensuring that we leverage efforts from hardware companies such as AMD and Intel to support the latest available hardware technologies. For example, Xen 4.0 supports the latest in SR-IOV cards which are just now being shipped to customers.

The third bullet on the mission statement can now be checked off as has been instrumental in the efforts to upstream DomU paravirtualization software into the Linux kernel so all Linux distributions are now available for paravirtualization with no user changes required. is also working to upstream changes for our Dom0 kernel  to Linux and is being led by Jeremy Fitzhardinge and Konrad Wilk who recently updated the community on their work at Xen Summit; slides here. As Xen is not written as a Linux module or specially for Linux only deployments, it takes additional efforts to properly include Xen dom0 support into the Linux kernel. The community is always open to new contributors to assist Jeremy and Konrad on their development project and can contact me for next steps.  Finally, it is worth remembering that a Dom0 for Xen can run on NetBSD, FreeBSD, Solaris, or other operating system and is not a Linux only solution. Xen continues to embrace the customer choice model in Dom0 operating system selection which is part of our core mission.

The remaining bullets also reflect what you see in as we look to support customer choice in all computing elements as well as ensuring that leads the industry in pushing the envelope in new features for hypervisors.

As you can see,’s mission is not to create a stand-alone, Linux-only competitive product that is a single packaged offering for end-users. Instead, we focus exclusively on building the best open source hypervisor technology in the marketplace and allow others to leverage our technology in any manner they wish with a maximum amount of flexibility for processor choice, Dom0 operating system , DomU virtualization, management tools, storage tools, etc. This flexibility along with  technology capability is a competitive advantage for customers and companies that choose Xen. Going forward, the community will continue to focus on these goals as we include our new Xen Cloud Platform project  and Xen Client Initiative into the technology deliverables from our open source community.

Xen Community Participation

When it comes to open source communities, most people think of contributing via software development,  product testing, and online support. While all these areas are critically important to the community, there are other ways that people can contribute.  In this blog post, I would like to list some ideas for people looking to add value to the community:

  • Documentation – There is always a need for better documentation (especially in multiple languages) . There is an ongoing document project at; we are always looking for areas to work on and people to assist in writing the documents
  • Wiki – The current wiki – is available in English, Spanish, German, Russian, Italian, Chinese, Korean, Japanese, and French. We always need more languages or additional translation for these languages. Wiki Translation page is
  • Event Speakers – The community always benefits from people presenting at various events around the world about the Xen Hypervisor and the community. Slides are available in English and Spanish to assist in building a presentation.  (Would like to have other languages available as well). Please post on the blog or let me know what events you are speaking at.
  • User Groups – Start your own user group! Both Brazil and Italy have groups and I am looking to further expand our global community.
  • Champions Group – A group of community members interested in sharing ideas and supporting all marketing efforts associated with the community and Xen hypervisor. More details at
  • Specific Language Mailing Lists – We currently have a Xen community mailing list for Japanese speakers – – and can easily setup another language if necessary.
  • Event Participation – Both Xen Summits and Xen Directions events require community support in reviewing and selecting topics for the final agenda; Xen Summit/Directions Program Committee.  All community members are encouraged to participate in a Program Committee
  • Case Studies – Help find or write a Xen case study; showing the user community the value of the open source Xen hypervisor is of great value to the project’s success. Current case studies at
  • Blog, Blog, Blog – The community has an open blog for anyone wanting to publish at If you wish to become an author, contact me for full rights. I also have a Blogroll on the page and will add any Xen related blog – just contact me.
  • Twitter, Twitter, Twitter – I have started to post related information as xen_com_mgr and have over 200 followers including several people who are also posting info such as XenHypervisor, XceptN, timbury, diegomarino. If you are on twitter, please let me know so I can follow you.
  • Social Networks -  I am currently aware of  Xen related groups on LinkedIn, Facebook, Ohloh, Xing, & Plaxo. You can find links to all these groups at Take some time to answer questions on these groups or post information about Xen.  If you are running another group or aware of another network, please let me know.

Of course, this is just a list of possible ways that you can contribute to the community beyond the standard develop, test, and support. If you have other ideas please add comments or send me an email. I look forward to the continuing success of Xen and the community.