ERT_RANGE) which can splice in a hole (all later
file contents are shifted in offsets); maybe our save code could take
advantage of that to repair existing saved images with insufficient
header size in a more efficient manner than manually shifting the rest
of the file contents ourselves.
--
E
[adding Markus]
On 2/3/20 4:13 AM, Daniel P. Berrangé wrote:
On Fri, Jan 31, 2020 at 06:44:42AM -0600, Eric Blake wrote:
On 1/31/20 4:38 AM, Peter Luo wrote:
error: internal error: cannot parse json {"execute": "block-commit", "arguments": { "device":
vol...
"{\"execute\":... \"base\":\"json:{\\\"encrypt.key-secret\\\":\\\"vol...
or even things like:
q='"'
qq='\"'
"{${q}execute${q}:...
${q}base${q}:${q}json:{${dq}encrypt.key-secret${dq}:${dq}vol...
But as mentioned elsewhere in this thread, embedding nested json via
qemu-monitor-command is already a sign that you are using unsupported
means, and where newer libvirt supports what you want to do natively,
you're better off upgrading to that supported method instead of trying
to hack around the command line through an unsupported backdoor.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
description
of the arguments.
Yes, the perl bindings don't have the convenience wrappers like virsh,
so you'll need the XML; but the perl bindings DO let you also pass in
flags for the case where virsh has bool options for setting a flag.
--
Eric Blake, Principal Software Engineer
Re
x27;overlay.qcow2'
> And then back to ''overlay1 in the following text: 'mergning contents of
> 'overlay1' into base'
> (Where 'mergning' is spelled wrong, but that doesn't affect the logic).
Also fixed, here preferring overlay1.qcow2 since
m --diskspec
vdb,file=/path/to/file.sn
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Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
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libvirt-users mailing list
lib
back into the base file
and get rid of the overlay)
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Virtualization: qemu.org | libvirt.org
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libvirt-user
rmissions, then tell virsh to
--reuse-external (so that libvirt no longer has to try and create the
files, and thus doesn't mess with permissions).
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization:
On 3/7/19 4:55 PM, Maximilian Schieder wrote:
> Hey,
> I want to ask if LibVirt PHP will be develop further or if it is deprecated.
It is not deprecated, but it never hurts to have more developers
submitting patches.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-9
2016'. KVM version is 'QEMU
> emulator version 2.7.1(Debian 1:2.7+dfsg-3)'. Hoping for you reply. Thanks!
Hmm, my incremental backup API will require qemu 4.0; there have been a
number of fixes in the qemu bitmap tracking that have landed since qemu
2.7.1. It could also be that
en ?
Live blockcommit works onto any host storage protocol (whether
filesystem, block device via LVM, or even remote access such as NBD or
ceph). The key is that your overlay is a qcow2 file that is tracking
the deltas during the time in which you are capturing your backup of the
backing file,
ut it is surprisingly complex to come up with
semantics for deletion of an external snapshot in a way that doesn't
corrupt data, so no one has tackled that code project.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-91
arrive on the 'libvirt-users' list archives; but
it's not there yet --
https://www.redhat.com/archives/libvirt-users/2018-May/thread.html]
Actually, the attachment was probably rejected by list moderation for
being oversized.
--
Eric Blake, Principal Software Engineer
Red Hat, In
tting up TLS migration is
where we are relying on gnutls to provide it rather than virRandomBits).
So at this point, it's just a matter of someone writing the patches.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
lusters to create collisions when their random number sequences
sync up.
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Virtualization: qemu.org | libvirt.org
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If I were to expand the guest's ext4 file system I would want to do it
unmounted and from a live CD but I'm having a heck of a time getting my
live distro to use the virtio disk drivers. Any advice there?
virt-resize from libguestfs-tools is your friend!
--
creating and later merging portions of a chain of snapshots,
although we could still improve libvirt to make this feel like more of a
first class citizen.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
___
el/2018-04/msg00865.html
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a
of what changed since a previous backup checkpoint, and that's true
whether it is qemu writing the backup [push model] or a third party
consuming the backup over NBD [pull model].
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
On 04/27/2018 11:15 AM, Eric Blake wrote:
> On 04/27/2018 02:20 AM, gaosheng cui wrote:
>> Hi,using ignore_value in libvirt source code
>> to do function return value processing,but I
>> can’t understand about it,can you give me some tips?thanks very much!
>
>
On 04/27/2018 11:15 AM, Eric Blake wrote:
> You can think of 'ignore_value(foo());' the same as '(void*)foo();',
Typo, make that '(void)foo();'
> except that the latter doesn't shut up all compilers.
--
Eric Blake, Principal Software Enginee
iler warns you, and even
then, only if you are sure that ignoring the value doesn't introduce
bugs - so using it also serves as a visual indicator to reviewers that
your choice to ignore the return value was intentional and should be
checked for accuracy.
--
Eric Blake, Principal Sof
and post only the URL to
your upload, so that the list isn't spammed with a huge image attachment.
[And speaking as a list moderator, my apologies to other list readers
for moderating this one through; often, I'm able to catch large message
attachments and reject the posts with sugges
running virtual machine is
through commands issued to the qemu process that is running the machine
(that is, via libvirt APIs if libvirt is managing the qemu process).
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.or
ilding
> libvirt.
> The GCC/Clang produced DLLs should be usabled from apps built with other
> compilers though.
Libvirt is also available on Windows via the Cygwin platform:
https://sourceware.org/ml/cygwin-announce/2017-09/msg00017.html
--
Eric Blake, Principal Software Engineer
Red
[moderator note: re-posting to list with screenshot deleted, in order to
meet list policy size constraints]
hello,
i am trying to install libvirt but getting some error . even though i am
folowing your instructions and steps
please help me out this
signature.asc
Description: OpenPGP digital si
x0'/>
>
>
>path='/var/lib/nova/instances/53f0710f-b25e-4f47-a7cf-c15a9409fdc3/console.log'/>
>
>
>
>
>
>
>
>
>
>path='/var/lib/nova/instances/53f0710f-b25
I know enough to not touch ZFS as long
as its current license doesn't play nicely with the Linux kernel)
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
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rily) out of sync with reality.
For more ideas on how to visualize things, check out my presentation at
last year's KVM Forum:
http://www.linux-kvm.org/images/5/5f/03x02-Eric_Blake-Backing_Chain_Management_in_QEMU_and_libvirt.pdf
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt
> [image: Imagem inline 1]
Note that this message was nearly rejected in the moderation queue for
being oversized. Sending an inline image instead of the text contents
of the screenshot is bad enough on bandwidth, but compounding the
problem by keeping the image in the reply puts a pretty heavy
[moderator note: .pngs were stripped to avoid overwhelming the mail
server and list recipients with 1M of data]
Forwarded Message
Date: Wed, 30 Mar 2016 11:25:09 +0200
Message-ID:
<20160330112509.horde.0oad-zfkzdznouxf-vke...@webmailperso.univ-brest.fr>
From: ville...@kassis.univ-
ward the current command line to 'virsh complete', and
you'd only ever have to write the bash wrapper once, rather than
maintaining it through each virsh addition.
At one point, a student attempted work on this for Google Summer of Code
(I think 2014?), but didn't get anywhere.
virsh memtune' and 'virsh dommemstat' ask different questions, and may
be able to give you more insight into the guest's current memory usage
(but it might also be something you can't learn without guest cooperation).
--
Eric Blake eblake redhat com+1-919-301-3266
Li
;
> Anything else I should do?
>
> Anything I could check?
You should really look into using 'virt-resize' and 'virt-sparsify',
both part of the libguestfs tools suite, because they make this job a
LOT less error-prone and automatable.
--
Eric Blake eblake redh
API. Libvirt happens to copy its memory
into files located under /etc/libvirt for persistence reasons, but
modifying those files behind libvirt's back is not a good idea - in
fact, those files start with the disclaimer:
--
Eric Blake eblake redhat com+1-919-3
with Ubuntu to know the preferred layout there, yet no one
seems to be bothered enough to submit a patch to autogen.sh, so it may
just work).
Or there's always the option of deleting the distro build, so that only
your self-build can be found.
--
Eric Blake eblake redhat com+1-919
thout posting actual error messages, there's not much more we can
do to help you.
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Libvirt virtualization library http://libvirt.org
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a copy operation
efficiently. Requiring the domain to be transient (via the
undefine/define wrapper around the blockcopy) was a design decision made
when blockcopy was first added to make the caller aware of the
limitations, and put the caller in charge of what happens if the domain
disappears in
rt metadata (by invoking: virsh
> snapshot-delete vm1 --delete --current -- repeat this as needed.)"
>
> Shouldn't the
>
> virsh snapshot-delete vm1 --delete --current
>
> be rephrased as
>
> virsh snapshot-delete vm1 --
--no-metadata' option, then blockcommitted? I
> understand libvirt doesn't do it yet.
>
> Thanks for any hint. I naively thought our use case was pretty usual,
> and I must admit I didn't think I'd have to dive into this complexity,
> which is why I'm thinki
or dropping at run-time when it is decided
that we want to commit to the disk after all; probably through a
block-commit operation.
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Libvirt virtualization library http://libvirt.org
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__
ernal --diskspec vda,snapshot=none
to explicitly override the defaults for both disks at once.
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Libvirt virtualization library http://libvirt.org
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things down to the point that
it cannot reply; instead, to learn if the command was successful, you
must listen to the ordinary QMP monitor for an event notification
corresponding to the change in guest state.
Libvirt already handles this interaction correctly.
--
Eric Blake eblake redha
ithout privileges, your guests will
have a harder time using networking, but that's what you'd expect.
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Libvirt virtualization library http://libvirt.org
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_
lso curious as to why this is considered a hack method. It states
>> in the wiki that "This method is a hack", but it doesn't express why.
>
> I consider it a hack because:
>
> 1) It requires the IP address of the guest to be known before the guest
> is started
It would be simpler to have
a CentOS SIG build this, but it hasn't happened yet.
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Libvirt virtualization library http://libvirt.org
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libvir
he flag). To confirm, can you do:
virsh version --daemon
and if the 'Using library:' line is newer than the 'Running against
daemon:' line, I'm right.
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
signat
g wrappers, which basically behave the same as bare metal
system adding or removing a disk from the hardware bus while the guest
is running (not all hardware handles it gracefully, but there are
definitely storage arrays out there that manage just fine).
--
Eric Blake eblake redhat com+1-9
, you could possibly hot-unplug the disk that has the state you no
longer want, then hot-plug the updated disk that does have what you
want. If your guest can handle storage going away and then being
plugged in, then that is just as effective as anything that snapshots
would do at rolling back
/images# qemu-system-x86_64 --version
> QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.11), Copyright (c)
Likewise, qemu needs to be at least 2.2
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Libvirt virtualization library http://libvirt.org
signature.asc
Descript
adding persistent bitmaps, and the hope is that libvirt
can take advantage of that to allow blockcopy to work without requiring
a transient domain. But in the meantime, you may have to use 'virsh
dumpxml $dom > $file', 'virsh undefine $dom' prior to the blockcopy,
then &#
e the domXML before feeding it to 'virsh create'.
Qemu domains have that ability, via an XML namespace that adds
:
http://libvirt.org/drvqemu.html#qemucommand
but no one has yet implemented that for Xen domains. If you want to add
it, the src/qemu code would be the obvious starting point to
virshcmdref document is a bit sparse, as the last major
contribution was in 2011, and no one has stepped in to keep it up to
date. You are welcome to start submitting patches; the repo is:
git://libvirt.org/libvirt-virshcmdref
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualiza
ently working on a patch for
libvirt that will take advantage of a recent qemu feature of setting a
threshold for event triggering, such that you could then request
notification that the lvm volume is X% full and give yourself time to
enlarge the lvm volume even before you reach the point where th
On 05/06/2015 02:05 PM, Michael Schwager wrote:
> Hi,
> We are running on CentOS 7.0. We want to move our VMs (kvm/qemu) from
> qcow/image files to logical volumes under LVM.
>
> I have moved one of them but I had a little trouble editing the disk
> properly and I wonder what is the correct way to
-create --redefine $dom $file'),
where the redefined domain is not strictly ABI compatible, but where
libvirt no longer has the information on hand to reject the redefinition
as invalid.
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
sig
On 04/29/2015 10:30 AM, Eric Blake wrote:
>> Is there a way to just copy the data file over to the second server,
>> without moving the VM?
>> I want the equivalent of doing these two migrations is sequence, but
>> without moving the VM.
>
> Yes - 'virsh bl
downtimes take a long lead time and are between 01:00 and 05:00.
>
> Mit freundlichen Gruessen
> Andreas Buschmann
>
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
signature.asc
ver of guests, where you can get even more rapid
response time for recovering on the backup host when the primary host
fails (look for COLO on the qemu archives). Again, it will need to land
in qemu, as well as be wired up in libvirt.
--
Eric Blake eblake redhat com+1-919-301-3266
Libv
CPU features, to get a fresh boot, rather than trying to
revert to the snapshot state. Also, is your snapshot internal or
external? Depending on how the snapshot was created may affect how to
alter the to point at the desired disk state.
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Eric Blake eblake redhat com+1-919-301-326
proposals on the qemu list for adding such a qemu-ga
command, although it hasn't been reviewed for inclusion yet.
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
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host. It can't manage VMs on a distant
> hosts, so I'm afraid you'll have to query daemons on all the hosts to
> get desired info.
That said, libvirtd IS designed to be remote controlled, so it is
certainly feasible to write higher-layer applications that manage
connections to m
ttp://libvirt.org/drvqemu.html#qemucommand
it is essential to have something like:
before any other will be recognized. (The namespace does not
have to be named 'qemu:', but it makes it easier to stick to the naming
used by the examples)
--
Eric Blake eblake redhat com+1-919-301-
need to fire up this command twice?
> Any ideas?
'virsh shutdown' requires guest cooperation. In particular, if you have
not hooked up a guest agent, then all it can do is send an ACPI signal
into the guest, but it is up to the guest whether it shuts down on
receipt of that signal (and not
you can upgrade to newer libvirt that understands
the newer format. [For example, basing your distro on RHEL 7, even if
you choose to use CentOS instead of RHEL, is a way to get new-enough
libvirt]
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualiz
I know that disk hotplug/hotunplug
worked that far back at writing both persistent and live definitions to
disk, but that's a bit heavyweight when it comes to trying to tweak the
domain just to ensure you hit a code path that properly flushes to disk.
We've done better at auditing the co
page/FAQ#Where_are_VM_config_files_stored.3F_How_do_I_edit_a_VM.27s_XML_config.3F
Instead, if you are still suffering from a build of libvirt that fails
to update the files in /etc when taking a snapshot, do some other action
that DOES update /etc (such as changing the domain description), or at a
bare min
th (8-byte maximum,
transferred in plaintext in the protocol). Spice security is much
better, and also not impacted by the limitation on preserving passwords.
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Libvirt virtualization library http://libvirt.org
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ng-of-the-libvirt-api-and-xml-to-glibgobject/
In particular, the libvirt-gconfig subproject deals with C code (and
other language bindings) for more easily generating libvirt XML within
the framework of glib's GObject classes.
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virt
al reasons) pass a 'long'; these APIs properly flag overflow if
a value cannot be converted from 64-bit on the host down to the limited
32-bit on the client. But as long as the API doesn't trigger that large
of a value, you are fine. And for everything specified as 'int'
ly uninstall the pre-built distro version, so that you have
only your self-built version accessible
2. when self-building, make sure you use the same configure arguments as
your distro would do (on Fedora-based distros, you can do this with
./autogen.sh --system, when building from git)
--
Eric
nal snapshot and which would be
freed if that snapshot is deleted, but adding such a metric would be a
job for the qemu list, and not anything libvirt can do without qemu's help.
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http
what the NBD is serving - the NBD connection MUST be raw, unless you
have a funky situation with a qcow2 file whose contents are also a
nested qcow2 encoding of data.
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
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Descript
s raw,
>> rather than qcow2. My platform is libvirt+qemu. the image type of this vm
>> is indeed qcow2. I do not know how to let nbd know this image format.
>
> Hmm, I wonder if `virsh --migrate` should have a --format (or -F) option
> that one can specify the format. Let'
copy' command pointing to the NBD server as the destination.
>
> Sorry to take you so much time to answer my questions. I appreciate it
> deeply. After I solve this issue, I will write a blog and share these
> knowledge with other people.
The libvirt-users list archives has a lo
act, modern
libvirt/qemu does this for you by setting up an NBD server on the
destination, doing a data mirror from the source into the destination
(so that you DO have shared storage, at least for the duration of the
migration), then doing the live migration, then tearing down the NBD
m
disclaimer
unenforceable. It's often considered poor netiquette to send mail to
public lists from accounts that spam legalese garbage on the end.
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.
hot with shared storage destination
base <- mid <- active(frozen) <- shared
copy base, mid, and active to the destination
live migrate using shared storage instead of doing storage migration
block-commit shared back into active
base <- mid <- active
where the shared storage only needs to
after reboot. Perhaps I'm just using it wrong?
That tool is not provided by upstream; maybe it is a downstream Debian
tool? And from the name, that may indeed be the tool that does what you
want?
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt
in memory but not flushed
to disk, and most likely require an fsck (that is, nuking the
managedsave image is equivalent to pulling the power cord on a running
bare-metal machine, then recovering when restoring power for the next
boot) [virsh managedsave-remove]
--
Eric Blake eblake redhat com
tely in the guest.
If you want to see an example of how virDomainOpenConsole is used
correctly, look at the source code for 'virsh console'.
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
s
e host other than the fact that a lot
of wall clock time elapsed for one operation. Look for the
'error_policy' XML setting under
http://libvirt.org/formatdomain.html#elementsDisks
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.or
imply run it?
Look at virt-builder, part of libguestfs:
http://libguestfs.org/virt-builder.1.html
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Libvirt virtualization library http://libvirt.org
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--redefine
after the domain is redefined, if you want to still revert to that state.
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Libvirt virtualization library http://libvirt.org
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libvi
r at least a new flag to the
existing API) to limit device changes to just the password, and where
password changes could be restricted differently from other device
changes. Daniel Berrange should have more ideas on whether that makes
sense, since he implemented the original ACL permissi
e it is smaller, a shallow
blockcopy is likely to finish faster. Then, once everything is copied
to the new location, use active blockcommit to merge the temporary
wrapper back into the normal backing file.
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library htt
tps://bugzilla.redhat.com/show_bug.cgi?id=1057800
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Libvirt virtualization library http://libvirt.org
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libvirt-users mailing list
libvirt-users@
job attempts are made. See commit e1125ce.
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1135169 -- blockcopy job
> was cancel by "CTRL+C" while it show there still be one block job in
> background
That was against RHEL 7; but I don't know if any Fedora releases
blockcopy --raw /dev/nbd2 ...', to see if I was right
and that makes the difference. Remember, blockcopy CAN change things so
that the destination (as seen by qemu) is a different format than the
source, and in the case of doing a blockcopy from a qcow2 source to a
raw-image NBD server, t
also ensured that guest I/O was stable
before the point of breaking the mirroring (basically, using guest-agent
freezing and thawing around the operation).
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
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Descriptio
t; Is there something that I need to configure, or is this a libvirt
> version issue, or what?
A version issue.
>
> The system with the "pages" entries is running 1.2.9, while the system
> without them is running 1.2.2.
was added in v1.2.6 (commit 02129b7).
--
Eric Blake
7;m trying to
take another audit of the code this week to see if I can find a problem
in the libvirt code.
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Libvirt virtualization library http://libvirt.org
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_
alue back into a positive EINVAL errno value).
As for why qemu is seeing an EINVAL, I have to wonder if it is a case of
AppArmor blocking access to a file. But that's weird, as internal
snapshots don't normally need to open any additional files. At any
rate, it's more likely to
hat don't mind opening the image,
it is a lot harder to retype the contents of your screenshot than it is
to copy and paste your example in order to try and reproduce your issue.
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Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtualization library http://libvirt.org
x27; show anything? If so, you have hit a state
where your guests are not running, but still defined, and 'virsh start
$dom' will restart the given domain. Normally, the 'libvirt-guests'
systemd service will arrange to automatically restart a guest where it
left off just before t
ng the resulting file.
>
> What am I missing here?
>
> libvirt (1.2.2) and qemu (2.2.0) as distributed with Ubuntu Trusty.
>
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Libvirt virtualization library http://libvirt.org
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Description: OpenPGP digi
the VM's.
As for whether files in the host filesystem atop its LVM, vs. separate
LVMs entirely, is more efficient, you'd have to benchmark the difference
it makes (fewer layers by using LVMs directly probably makes for more
efficiency, but it also means more effort in setting things up comp
d. We only promise backwards
compatibility (new versions will not lose data from old versions), not
forward compatibility (old versions might be confused by data added in
new versions).
>
> Does anyone know how to solve this problem?
Upgrade back to libvirt 1.2.2 or newer. The new libvi
rameter, hw_qemu_guest_agent=yes for
> the guest image.
> And then installing qemu-guest-agent inside the guest.
>
> What steps do i have to follow for windows ?
The same steps - qemu-guest-agent is available for both Linux and
Windows guests.
--
Eric Blake eblake redhat com+1-91
to manage multiple files, but the RAM state is kept separate
from disk state, and cleanup is a LOT easier because you merely delete
the files you no longer need, instead of trying to defragment within a
file you are still using).
--
Eric Blake eblake redhat com+1-919-301-3266
Libvirt virtu
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