On Thu, Mar 15, 2018 at 3:26 PM, Gianluca Cecchi <[email protected]> wrote:
> On Thu, Mar 15, 2018 at 2:26 PM, Sergey Vavilov <[email protected]> > wrote: > >> Hello! >> >> I'm wondering >> how can I run a cmd.exe command (or powershell) inside windows guest >> virtual machine by >> ovirt-agent from outside (from ovirt-engine or from host)? >> What's ovirt's analogue for >> virsh qemu-agent-command >> ? >> Actually, I want to setup ip on virtual NIC. >> So I can't run a command via windows' protocols. >> ovirt-agent service works in windows virtual machine and successfully >> reports its state to ovirt engine. >> But it looks like ovirt-agent isn't suitable to run commands in virtual >> machines? >> Or am I wrong? >> Should I configure a coexistence of ovirt-agent and qemu-agent inside vm >> somehow? >> How did you solve such task before? >> >> Thank you, all! >> >> >> -- >> Sergey Vavilov >> >> > Hi Sergey, > I recently had a need for a Windows 2008 R2 x86_64 VM that I moved from > vSphere to RHV (but the considerations below are the same for oVirt). > In my case I had to run a backup of an Oracle database that is in > NOARCHIVELOG mode, due to performance reasons: it is an RDBMS used for BI > that is refreshed every day and doesn't need a point in time recovery but > only a consistent state before the "new day" processing is run at 01:00 in > the night. > In vSphere the backup of the VM was implemented with Veeam, that uses > snaphsot technology and interacts with VSS layer of M$ operating systems. > Oracle fully supports on Windows the backup of database using VSS only if > it is in ARCHIVELOG mode. > https://docs.oracle.com/cd/E11882_01/win.112/e10845/vss.htm#NTQRF475 > > Veeam automatically executed shutdown / snapshot / start of the dabatase > because I think it implements what in the link above is called as > PRE_SQLCMD in OnPrepareBackup callback (through the VeeamGuestHelper.exe > executable). > > Coming back to oVirt, the interaction with Windows VSS layer is indeed > done by "QEMU guest agent"too; you have to install it together with the > oVirt Guest Agent when you install oVirt Guest Tools > > So in my case I would need for Windows something similar to the > "fsfreeze/thaw hooks" I have in Linux QEMU guest agent. > But searching through the code it seems this functionality is only present > in Linux component... > In fact some days ago I wrote to the qemu-devel mailing list to ask for > possible implementation: > http://lists.nongnu.org/archive/html/qemu-devel/2018-03/msg02823.html > > No answer so far. Feel free (you and others) to contribute to the thread > if you think it can help... > It could also be useful to have at least writer control commands > implementation in VSS interaction of QEMU Guest Agent in Windows, so that > one could do something similar to what Veeam on vSphere already does... > > Based on what I have wrote above, I doubt you could interact at all > through the QEMU guest agent on Windows to run any command... > And also for Linux guests, I think you are restricted to the default > actions (eg shutdown) or forced to use as a workaround the approach to run > a snapshot (that then you delete) and "attach" the desired command to the > freeze (or thaw) hook... > > HIH, > Gianluca > > > Hello, in an off-list message it appears that the qemu guest agent offers a "guest-exec" command, but that it is not enabled into the build at https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-virtio/virtio-win-0.1.141-1/ can anyone confirm this and its reasons (security? isolation?...) Could the policy change and for example allow a choice to have it or not at runtime? Any hint on how to recompile enabling the feature? Thanks, Gianluca
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