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[Qemu-devel] [Bug 1477538] Re: Windows QEMU Guest Agent VSS Provider ser
From: |
Joop Martens |
Subject: |
[Qemu-devel] [Bug 1477538] Re: Windows QEMU Guest Agent VSS Provider service stops during qemu backup |
Date: |
Mon, 30 Nov 2015 13:25:02 -0000 |
After upgrading to QEMU guest agent 7.2.1 this issue disappeared.
The only minor "issue" that remains is that the QEMU Guest Agent VSS
Provider service is being installed with start-up type: Automatic.
After a backup the service is automatically being stopped causing
monitoring systems like the Windows server manager to complain about
stopped services with start-up type automatic.
Because the Qemu guest agent starts the VSS provider service
automatically when a backup is being triggered this can easily be solved
by changing the start-up type to: manual.
I have now changed the start-up type to manual using GPO for all my Qemu
Windows guests.
I have filed a bug report at Redhat with the request to change the service
start-up type to manual for the provided MSI install packages.
https://bugzilla.redhat.com/show_bug.cgi?id=1286672
** Bug watch added: Red Hat Bugzilla #1286672
https://bugzilla.redhat.com/show_bug.cgi?id=1286672
** Changed in: qemu
Status: New => Fix Released
** Changed in: qemu
Status: Fix Released => New
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1477538
Title:
Windows QEMU Guest Agent VSS Provider service stops during qemu backup
Status in QEMU:
Fix Released
Bug description:
I’m currently implementing the QEMU Guest Agent on all my KVM Windows
guests.
I’m using the stable VirtIO drivers and Guest agent from Fedora:
https://fedoraproject.org/wiki/Windows_Virtio_Drivers
Both the stable and latest release do provide Qemu Windows Guest agent
7.0.0.10.
After the Guest agent installation I initially received VSS events
with ID 8194:
Volume Shadow Copy Service error: Unexpected error querying for the
IVssWriterCallback interface. hr = 0x80070005, Access is denied.
This is often caused by incorrect security settings in either the writer or
requestor process.
Operation:
Gathering Writer Data
Context:
Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Name: System Writer
Writer Instance ID: {6c777a34-53dd-4fb3-a4c9-b85d7e183e27}
I was able to fix this issue by adding local access permissions for
the “Network Service” account at the Dcom security permissions:
On the client computer from the Start Menu, select Run
The Run dialog opens.
In the Open field type dcomcnfg and click OK.
The Component Services dialog opens.
Expand Component Services, Computers, and My Computer.
Right-click My Computer and click Properties on the pop-up menu.
The My Computer Properties dialog opens.
Click the COM Security tab.
Under Access Permission click Edit Default.
The Access Permissions dialog opens.
From the Access Permissions dialog, add the "Network Service" account with
Local Access allowed.
Close all open dialogs.
Now an initial backup runs without any errors but this is causing the
QEMU Guest Agent VSS Provider service to stop running without any
error in the event log.
As a result a second backup will cause an error: MSDTC Client 2 with
event ID: 4879:
MSDTC encountered an error (HR=0x80000171) while attempting to
establish a secure connection with system SERVERNAME.
This is probably caused because the QEMU Guest Agent VSS Provider
service isn’t running anymore.
I can manually start the QEMU Guest Agent VSS Provider service but
every backup is causing the service to stop.
I’m seeing this behavior at all my Windows based guests running both
Windows Server 2012 R2 and Windows Server 2008 R2.
Since I can’t find any logging or troubleshooting possibilities for
this particular service I'm open for suggestions how to troubleshoot
this issue to receive detailed information about the reason why this
services stops running during a backup.
qemu-server 3.4-3 amd64
Guest agent 7.0.0.10
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