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Re: [libvirt] Hyper-V driver API version support

On Fri, Aug 09, 2013 at 10:13:03AM +0200, surface me is-a-linux-user org wrote:

The "version" function is not supported by the hyperv driver:
$ virsh --connect=hyperv://hypervhost version
Compiled against library: libvirt 1.1.1
Using library: libvirt 1.1.1
Using API: Hyper-V 1.1.1
error: failed to get the hypervisor version
error: this function is not supported by the connection driver:

But we need this funtion for the "external/libvirt" stonith plugin
of clusterglue:

$ cat /usr/lib/stonith/plugins/libvirt | more
# get status of stonith device (*NOT* of the domain).
# If we can retrieve some info from the hypervisor
# the stonith device is OK.
libvirt_status() {
    out=$($VIRSH -c $hypervisor_uri version 2>&1)
    if [ $? -eq 0 ]
        out=`echo "$out" | tail -1`
        ha_log.sh notice "$hypervisor_uri: $out"
        return 0

    ha_log.sh err "Failed to get status for $hypervisor_uri"
    ha_log.sh err "$out"
    return 1

So, we can't implement libvirt stonith with hyperv support in our
corosync/pacemaker cluster. Is it possible to implement the
"version" function for hyperv into virConnectGetVersion? Or exist
any workaround for this problem?

I'm sure its possible, but it needs someone with knowledge of the
Hyper-V apis to write a patch and there's only a couple of people
in libvirt comunity who can do that. Patches welcome from any able


Hi Daniel

I don't know which api is used for the driver handling, maybe you mean this one here: http://msdn.microsoft.com/en-us/library/aa155227.aspx

I tested the following command on our micro$oft server:
PS C:\Users\administrator> gwmi -namespace "root\virtualization" Msvm_VirtualSystemManagementService

__GENUS                 : 2
__CLASS                 : Msvm_VirtualSystemManagementService
__SUPERCLASS            : CIM_VirtualSystemManagementService
__DYNASTY               : CIM_ManagedElement
__RELPATH : Msvm_VirtualSystemManagementService.CreationClassName="Msvm_VirtualSystemManagementService",N ame="vmms",SystemCreationClassName="Msvm_ComputerSystem",SystemName="VSRV1"
__PROPERTY_COUNT        : 21
__DERIVATION : {CIM_VirtualSystemManagementService, CIM_Service, CIM_EnabledLogicalElement,
__SERVER                : VSRV1
__NAMESPACE             : root\virtualization
__PATH : \\VSRV1\root\virtualization:Msvm_VirtualSystemManagementService.CreationClassName="Msvm_ VirtualSystemManagementService",Name="vmms",SystemCreationClassName="Msvm_ComputerSystem",Sys
Caption                 : Hyper-V Virtual System Management Service
CreationClassName       : Msvm_VirtualSystemManagementService
Description : Service for creating, manipulating, and managing virtual systems
ElementName             : Hyper-V Virtual System Management Service
EnabledDefault          : 2
EnabledState            : 2
HealthState             : 5
InstallDate             : 20130717120539.000000-000
Name                    : vmms
OperationalStatus       : {2}
OtherEnabledState       :
PrimaryOwnerContact     :
PrimaryOwnerName        :
RequestedState          : 12
Started                 : True
StartMode               :
Status                  : OK
StatusDescriptions      : {The service is running normally}
SystemCreationClassName : Msvm_ComputerSystem
SystemName              : VSRV1
TimeOfLastStateChange   : 20130801095437.000000-000
PSComputerName          : VSRV1

so I think we can query the state like this:
PS C:\Users\administrator> gwmi -namespace "root\virtualization" Msvm_VirtualSystemManagementService | select Status


It's not the version, but we need something to let libvirt stonith know, that the stonith device can connect to hyperv and the hyperv service is running..

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