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

SATHEESARAN <sasundar@xxxxxxxxxx> · Fri, 28 Mar 2014 19:26:30 +0530



    On 03/28/2014 05:37 PM, Dave
      Christianson wrote:

    
            I've come across individual posts from people who
              supposedly have done this in CentOS6.5. Basically, all
              that is shown in the posts is the XML file generated, no
              mention of *how* that file is generated. Virt-manager has
              no provision for attaching directly to the gluster volume
              except as a mount. Neither virt-manager nor virt-install
              recognize the gluster:// type.

            
    Yes, even I was frustrated at this. There seems no way to utilize
    the image file using libgfapi.

    As Harsha mentioned in his earlier thread, libvirt is yet to expose
    this.

    I have already raised a bug regarding this,
    https://bugzilla.redhat.com/show_bug.cgi?id=1017308

    
          Supposedly earlier versions of RHEL used qemu-kvm as a
            wrapper for qemu-system-x86_64, however in 6.5 qemu-kvm is
            its own binary. Qemu-kvm also doesn't recognize the
            gluster:// type.

          
    With RHEL 6.5 / Centos 6.5 you can use, "/usr/libexec/qemu-kvm"

    This was the command that I used to make use of VM Images using
    libgfapi in RHEL 6.5 

    >> /usr/libexec/qemu-kvm  -drive
    file=gluster://10.70.37.87/testvol/test.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop,aio=threads
    -device
virtio-blk-pci,scsi=off,bus=pci.0,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=0

    
    The above worked for me.

    If I am not wrong, the libvirt in RHEL 7 supports glusterfs's
    libgfapi way of access mechanism.

    
    -- Satheesaran

    
          Debian and Ubuntu supposedly have the newer versions of
          gluster and qemu/libvirt availabe (ppa's?). Maybe I'll test
          Wheezy...

          
        Red Hat seems content to do their own thing. Although the
        verisons of libvirt and qemu are older, libgfapi is supposed to
        have been backported. It's a shame that full functionality is
        not included. It's mindboggling seeing that Red Hat owns
        glusterfs, you would think full support for the backend would
        have been included in their product. If it is, as you say, that
        RH includes this functionality only to RHN subscribers and is
        not made available downstream to CentOS/SL, and unless I can
        find a repository with the latest full versions of qemu &
        libvirt, then CentOS simply will not work.

        
                  On Fri, Mar 28, 2014 at 3:13
                    AM, Harshavardhana <harsha@xxxxxxxxxxxxxxxxxx>
                    wrote:

                    Virt-manager
                      / libvirt is yet to expose perhaps this
                      functionality -

                      but as far as i remember libvirt should be doing
                      this as a

                      pass-through for the URL's which have been passed
                       as

                      "<schema>://<server>/<volname>"

                      
                      Does libvirt 'invoke' fuse when passed
                      "gluster://" schema?

                      
                      On Thu, Mar 27, 2014 at 5:34 PM, Dave Christianson

                      <davidchristianson3@xxxxxxxxx>
                      wrote:

                      > Good Evening,

                      >

                      > I have read that libgfapi has been backported
                      to qemu-kvm in RHEL 6.5 (and

                      > by virtue CentOS and SL). However I am unable
                      to figure out how to actually

                      > make it work as described. Virt-manager still
                      only seems to support

                      > glusterfs volumes via fuse.

                      >

                      > I can use qemu-img to create a disk image on
                      gluster://<server>/<Volume>.

                      > But virt-manager can only use it from a fuse
                      mounted fileshare. There seems

                      > to be no ability to attach in virt-manager
                      directly to the image on

                      > glusterfs using libgfapi.

                      >

                      > All documents I've found describe the use of
                      the command

                      > "qemu-system-x86_64," however that command
                      does not exist in CentOS 6.5.

                      > That appears to be the only way to start the
                      domain using libgfapi. So

                      > basically, I can create an image via libgfapi
                      but cannot do anything useful

                      > with it.

                      >

                      > Should I be able to do this? If so, what's
                      the procedure? Or is CentOS/RHEL

                      > 6.5 just not fully integrated? I really want
                      to be able to use libgfapi and

                      > avoid the performance penalty of fuse. Should
                      I just grab & compile the

                      > latest verisons of libvirt and qemu-kvm?

                      >

                      >
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                          --

                          Religious confuse piety with mere ritual, the
                          virtuous confuse

                          regulation with outcomes

                        
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