[Gluster-users] Possible to use libgfapi with libvirt in CentOS 6.5?

[SATHEESARAN]

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 at harshavardhana.net <mailto:harsha at harshavardhana.net>> 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 at gmail.com
>     <mailto:davidchristianson3 at gmail.com>> 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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