Hi Lists,
I am looking at options to figure the transport type of a gluster
volume (given the volfileserver:volname) from a host that is *not* part
of gluster volume (aka not a gluster peer).
The context here is GlusterFS as a storage domain in oVirt/VDSM, which
is currently available in upstream oVirt.
This features exploits the QEMU-GlusterFS native integration, where the
VM disk is specified using gluster+<transport>://... protocol.
For eg. if transport is TCP.. the URI looks liek gluster+tcp://...,
otherwise gluster+rdma://...
Thus, to generate the gluster QEMU URI in VDSM, i need to know the
Gluster volume's transport type and the only inputs that oVirt gets for
GlusterFS storage domain are...
a) volfileserver (the host running glusterd)
b) volname (the name of the volume)
Currently i use VDSM's gluster plugin to do the eq. of "gluster volume
info <volname>" to determine Gluster volume's transport type, but this
won't work if the VDSM host is not a gluster peer, which is a
constraint! ... and I would like to fix/remove this constraint.
So i discussed a bit on #glsuter-dev IRC and want to put down the
options here for the community to help provide inputs on whats the best
way to approach this...
1) Use gluster --remote-host=<host_running_glusterd> volume info <volname>
This is not a supported way and there is no guarantee on how long the
--remote-host option be supported in gluster, since it has some security
issues
2) Use gluster ::system getspec <volname>
I tried this but it never worked for me... whats the right way of using
this ?
For me.. it just returned back to shell w/o dumping the volfile at all!
3) Have oVirt user provide the transport type as well (while creating
Gluster storgae domain) in addition to volfileserver:volname options
This would be easiest, since VDSM can form the gluster QEMU URI by
directly using the transport type specified by the user, and this won't
have a need to use the vdsm-gluster plugin, hence no need for VDSM host
to be part of gluster peer...but this would mean addnl input for user to
provide during Gluster domain creation and oVirt UI changes to take the
transport type as input in addition to volfileserver:volname
Comments/Opinions/Inputs appreciated
thanx,
deepak
(P.S. cross-posting this to VDSM and Gluster devel lists, as it relates
to both)
