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==== Storage cloning for LVM and Disk backends ====
==== Storage cloning for LVM and Disk backends ====
Revision as of 04:10, 13 July 2009
- 1 Virtualization
- 1.1 Enterprise Management Tools List
- 1.2 Fedora Virtualization List
- 1.3 Libvirt List
- 1.4 Fedora-Xen List
In this section, we cover discussion of Fedora virtualization technologies on the @et-mgmnt-tools-list, @fedora-xen-list, @libvirt-list and @ovirt-devel-list lists.
Contributing Writer: Dale Bewley
Enterprise Management Tools List
This section contains the discussion happening on the et-mgmt-tools list
More Device Support in virt-manager
Both these features were added to
. Serial ports can be directed to sockets listening on remote hosts. For example:
--serial udp,host=192.168.10.20:4444. That may come in handy for the F12 Hostinfo feature.
Xen, Windows, and ACPI
virt-install disables ACPI and APIC for Windows XP guests.
Adding, that it seems "that Windows XP is working fine with acpi/apic enabled which has
the immediate advantage that poweroff via ACPI works as expected.
So does it make sense to handle winxp the same win2k3?". Windows 2003 guests have ACPI enabled.
Pasi Kärkkäinen went to the xen-devel list and confirmed and relayed "Keir Fraser replied that ACPI with Windows has been working properly at least since Xen 3.1.0 days". Pasi then updated the Xen wiki page.
Fedora Virtualization List
This section contains the discussion happening on the fedora-virt list.
Fedora Virt Status Update
Also mentioned were:
- Details of a fix for "a dramatic slowdown in virtio-blk performance in F-11 guests"
- Note on Xen Dom0 support.
- New wiki pages created.
- Detailed run-down of current virt bugs.
New Mailing List and New Releases of libguestfs
The current release is now 1.0.57, but Richard is so fast that may change by the time you read this.
Recent new features:
virt-df- like 'df' for virtual machines
- New Perl library called Sys::Guestfs::Lib
- Now available for EPEL
- Tab completion in guestfish now completes files and devices
- Big change to the code generator
- Lots more regression tests
- guestfish commands: time, glob, more, less
- new commands: readdir, mknod*, umask, du, df*, head*, tail*, wc*, mkdtemp, scrub, sh, sh-lines.
- Debian native (debootstrap, debirf) support
USB Passthrough to Virtual Machines
Unfortunately, those wishing to manage their iPhone or newer iPods in a guest (yours truly included), KVM does not yet support the required USB 2.
This section contains the discussion happening on the libvir-list.
New Release libvirt 0.6.5
- create storage columes on disk backend (Henrik Persson)
- drop of capabilities based on libcap-ng when possible (Daniel Berrange)
- create and destroy NPIV support (David Allan)
- networking in UML driver (Daniel Berrange)
- HAL driver restart thread safety (Daniel Berrange)
- capabilities and nodeinfo APIs for LXC (Daniel Berrange)
- iNUMA API for VBox (Daniel Berrange)
- dynamically search and use kvm-img qemu-img or qcow-create (Doug Goldstein)
- fix qemu and kvm version parsing (Mark McLoughlin)
- serial number for HAL storage (Dave Allan)
- improve error reporting for virConnectOpen URIs (Daniel Berrange)
- include OS driver name in device XML (Daniel Berrange)
- fix qemu command flags fetching (Cole Robinson)
- check that qemu support -drive format= (Cole Robinson)
- improve emulator detection (Cole Robinson)
- changes to config parser to accomodate VMX syntax (Matthias Bolte)
- update network schemas and driver for missing elements (Satoru SATOH)
- avoid changing file context if not needed (Tim Waugh)
- skip labelling if no src path (Cole Robinson)
- add arm emulation if qemu-system-arm is present (C.J. Adams-Collier)
libvirt 0.6.4 was
on May 29.
is "shooting for a slightly smaller
development cycle, in order to be able to push the next version in time
for Fedora 12 Beta, this means a new release at the end of July, so only
a bit more than a couple of weeks for pushing the changes, I really hope
we will be able to include a first version of the ESX driver and Power
Hyprvisor, if it's the case I think it will be worth bumping the release
name to 0.7.0."
libvirt Repositories Mirrored on Gitorious
Development of libvirt recently moved to git as the source control management system.
"I have created a
project on gitorious which has a mirror of
the master branch of the libvirt.git repository. This mirror is *readonly*
and updated automatically every 15 minutes. The purpose of this mirror is
to allow people to easily publish their personal
libvirt working repos
to the world. The master upstream repository for
libvirt does not change".
The Role of libvirtd
a client's desire to make
"libvirtd be a one-stop shop for everything they need
to do on a virtualization host, including things we have traditionally
held out-of-scope for
libvirt. A partial list of those things would
- In-depth multipath config management
- Hardware lifecycle management (power-off, reboot, etc.)
- HA configuration
Hugh then asked "why *not* expand the scope of
to be a one-stop shop for managing a node? Is there a really good
reason it shouldn't have the remaining capabilities
"This is essentially suggesting that
libvirtd become a general purpose
RPC layer for all remote management tasks. At which point you have
just re-invented QPid/AMQP or CIM or any number of other general
purpose message buses.
libvirtd has a core well defined goal:"
- Provide a remote proxy for
"If you want todo anything more than that you should be considering an
alternative remote management system. We already have 2 good ones to
choose from supported with
- QPid/AMQP, with
libvirt-qpid agent + your own custom agents
- CIM, with libvirt-CIM + your own custom CIM providers
"Furthermore, adding more plugins to
libvirtd means we will never
be able to reduce its privileges to an acceptable level, because we'll
never know what capabilities the plugins may want."
Hugh countered 
libvirt-qpid daemon on the node that handles RPC over
QMF (for example), is there not some value in having
libvirt expose a
consistent API for the operations people want to do on a host regardless
of whether they have directly to do with managing a virtual machine or
Daniel Berrange didn't "really see any value in that" "You're just putting in another abstraction layer where none need exist. Just have whatever QMF agent you write talk directly to the thing you need to manage."
"I will note that when I presented the large client with the option of
QMF talking to multiple agents on the node but exposing (effectively) a
single API and a single connection, they seemed much happier. So perhaps
the right way to attack this is with the
ovirt-qpid daemon we are
currently working on."
"a bit synpathetic to the suggestion though."
should help run those virtualization nodes, I would not open the gate
like completely, but if we could provide all APIs needed to manage the
node on a day by day basis then I think this is not really beyond our
scope. I think that netcf(FWN#170) is an example of such API where we start to
add admin services for the purpose of running virtualization. Things
like rebooting or shutting down the node would fit in this, maybe
editing a drive partition too."
"Basically if we take the idea of a stripped down Node used only for virtualization, then except for operations which are first time setup options or maintainance, I think we should try to cover the requirements of normal operations of that node. To some extend that means we would step on the toes of CIM, but we would stick to a subset that's sure."
Storage cloning for LVM and Disk backends
Cole Robinson submitted a patch series which "implements cloning for LVM and disk backends. Most of the functionality is already here, it just needed some reorganization to be accessible for every backend."
"I verified the following scenarios produced a bootable image:"
- Clone within a disk pool
- Clone within a logical pool
- Clone a raw file to a disk pool
- Clone a disk pool to a logical pool
This section contains the discussion happening on the fedora-xen list.
Xen dom0 Forward Ported to Latest Kernel
Previously, Xen dom0 support in Fedora was provided by forward porting the Xensource patches from kernel 2.6.18 to the version found in the Fedora release at the time. This consumed developer resources and led to separate
packages for a time. As of
Fedora 9 this practice was deamed untenable, and support for hosting Xen guests was dropped from Fedora.
Work has since focused on creating a paravirt operations dom0 kernel based on the most recent upstream vanilla kernel. This work is incomplete and not expected to be done before F12 or even F13. However, experimental dom0 kernels have been created for the adventurous.
Pasi Kärkkäinen tells us the Xen 2.6.18 patches have now been forward-ported to the current 2.6.29 and 2.6.30 kernel. "Forward-porting has been done by Novell for OpenSUSE. Novell also has a forward-port to 2.6.27 for SLES11."
Pasi added "These patches are still more stable and mature than the pv_ops dom0 code.. Also, these patches have the full Xen feature set (pv_ops still lacks some features)."
More history is avilable.