Re: Possible to use libgfapi with libvirt in CentOS 6.5?

Lalatendu Mohanty <lmohanty@xxxxxxxxxx> · Sun, 30 Mar 2014 02:16:40 +0530



    On 03/29/2014 06:46 AM, Dave
      Christianson wrote:

    
      Hi all,
        

        I just installed a Fedora 20 test host, and after
          struggling with dependencies I'm happy to report that
          everything works perfectly. I'm not relying on the
          virt-manager gui at all, and from what I'm reading, currently
          libvirt cannot start an image from gluster via libgfapi
          anyway(?).
        

        For various reasons I don't wish to use Fedora in my
          production environment, so until the SIG group works their
          magic, if there is a way to compile the latest sources for
          qemu and libvirt on CentOS or Debian, I'll be in business.
        

        The performance difference between libgfapi and fuse is
          like night and day, very impressive. I never want to have to
          go back to running VM's over fuse again.
        

        Thanks again to everyone,
        David
        

    Hey David,

    
    Thanks for confirming about Fedora 20. Regarding  "currently libvirt
    cannot start an image from gluster via libgfapi anyway(?)."  Do you
    mean using virt-manager you cann't see a vm image through libgfapi
    and you need a fuse mount for this? But you can modify vm instance
    through qemu tools and then use libgfapi.

    
    Yes, there is a way to compile latest code available compile it for
    CentOS6.5. Here are the steps.

    
      We need relevant spec file and source code  to build RPM. 

      
      Spec file can be found by extracting [1] the source RPM of
        latest libvirt of CentOS 6.5 [2] or publicly available latest
        RHEL6.5 libvirt src RPM [3].
      For source we can take the source from Fedora20 [4] (again
        extract from src RPM) as it will be stabler than upstream latest
        code. 

      
      And try to create RPM using spec file of CentOS and source
        code of Fedora.

      
    If you have specific questions on it , we can take help from
      Kaleb, or  we can contact centos-devel mailing list. I am also
      working with it and if possible will provide the packages in
      gluster repository[5].

    
    However, I think we dont have enough documentation[6] on this
        and we badly need documentation on this. The documentation
        should have information about using libgfapi with qemu and
        libvirt. May be an example with Fedora 20 or some other distros
        would be good. 

      
    I have created a gluster wiki page[6] for this. I would
        request everybody (specially in this email thread :)) to
        contribute for it. If you are new in gluster
        documentation refer [7] for details.

    
    [1]
http://www.cyberciti.biz/tips/how-to-extract-an-rpm-package-without-installing-it.html

      [2] http://vault.centos.org/6.5/os/Source/SPackages/

      [3]
      http://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/

      [4] http://koji.fedoraproject.org/koji/buildinfo?buildID=505311

      [5] http://download.gluster.org/

      [6]
http://www.gluster.org/community/documentation/index.php/Libgfapi_with_qemu_libvirt

      [7]
http://www.gluster.org/community/documentation/index.php/Main_Page#Documentation_for_GlusterFS

    
    Thanks,

      Lala

    
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