similar to: Does libvirt have API to detect image format

Unfortunately my backing store file is not in a volume. So I guess I cannot use that method. On 8/11/14 3:45 PM, "Eric Blake" <eblake@redhat.com> wrote: >On 08/11/2014 02:35 PM, Jianfeng Tang wrote: >>> >> >> I am using backing store when I create my volume. However, the backing >> store file is from another team, which can be either in raw or in

On 08/11/2014 02:35 PM, Jianfeng Tang wrote: >> > > I am using backing store when I create my volume. However, the backing > store file is from another team, which can be either in raw or in qcow2 > format. > > Is there a libvirt API to detect image format by given an image file? Or I > have to run qemu-img? virStorageVolGetXMLDesc() in the C code ('virsh

Thank you Eric. Yes, it looks like AppArmor caused the problem. I will google on how to disable it. On 8/5/14 8:27 PM, "Eric Blake" <eblake@redhat.com> wrote: >On 08/05/2014 05:23 PM, Jianfeng Tang wrote: > >> >> However, if I moved my image file (not base image) to default location >> /var/lib/libvirt/images. It works. >> >> It seems

> Hi, libvirt experts, I used libvirt to create a VM and used backing store to a local file. It works fine until I installed my box to Unbuntu Trusty (14.04). I got the following errors when I tried to start the VM: Could not open backing file: Could not open <path to my backing file>: Permission denied However, if I moved my image file (not base image) to default location

> Hi, I plan to use KVM internal network 'default' and grep dhcp log to figure out the IP address that assigned to my VM. I know I can configure static ip but I like to assign ip dynamically to avoid mgmt cost. Does anyone know where the dhcp log is? My KVM host is running Ubuntu Raring (13.04). It does not have file /var/log/daemon.log as some online doc mentioned. Thanks,

Thank you Daniel. How difficult to extend libvirt for this? One critical application on my VM needs to turn vnet_hdr off. I can switch to use qemu directly. However, in that way I will lose all the nice things provided by libvirt. Thanks, ~Jianfeng On 3/3/14 3:53 AM, "Daniel P. Berrange" <berrange@redhat.com> wrote: >On Fri, Feb 28, 2014 at 07:11:13PM +0000, Jianfeng Tang

Hi, I am using libvirt and virsh to create my VM on KVM. It works fine. However, I need to turn off vnet_hdr for virtio interface. Does anyone know how to do it through libvirt? Thanks.

Daniel P. Berrange <berrange@...> writes: > > On Tue, Mar 04, 2014 at 03:56:06PM +0000, Jianfeng Tang wrote: > > Thank you Daniel. How difficult to extend libvirt for this? One critical > > application on my VM needs to turn vnet_hdr off. > > Can you explain why in more detail. We don't expose this as a configurable > setting because we don't believe

Hi, Is it possible to "pivot" to a new image without doing blockcopy or blockpull? I know how to use snapshots and blockpull to create a new image and pivot to using it live, but what I would like to do is to have a VM switch from using imageA.qcow2 to image2.qcow2 while running. I don't see why this wouldn't be possible since some of the existing libvirt tools can do this when

Thank you Eric, On 2014-02-05 17:23, Eric Blake wrote: > Yes, live storage migration is possible; although at the moment, qemu is > lacking a way to restart the operation if it fails midstream, so libvirt > only allows the operation if you are willing to temporarily make your > guest transient. What does this mean? Will I loose anything if - for example - there is not enough space on

Hi , I am trying to perform offline migration (i.e) Create an incremental image using the qcow format, transfer the vm memory state to a state fie.Use the image and statefile together as a template. Now create a new vm using the template. I can successfully do it using the following commands : Save phase : stop migrate "exec:gzip -c > STATEFILE.gz" qemu-img qemu-img create -b

Hello Fairly new to libvirt. I’m hoping to both solve a problem with this question as well as learn more detail about how libvirt works. Using RHEL 6.4 and libvirt version is 0.10.2 and qemu-img version is 0.12.1.2 Using virt-manager I created a VM. Nothing unusual as far as I can see. I then added a disk. So I have a second virtio based volume which the guest then mounts as a separate

Hello Thanks heaps for your suggestions. responses inline. On 10 Apr 2014, at 10:34 pm, Eric Blake <eblake@rehost1hat.com> wrote: > > [ … ] > [Can you convince your mailer to wrap long lines? It makes it easier > for other readers] I’ll try and keep the lines short. I don’t see any obvious setting to change the wrap. >> >> Using RHEL 6.4 and libvirt version

I am experimenting with the blockcopy command, and after figuring out how to integrate qemu-nbd, nbd-client and dumpxml/undefine/blockcopy/define/et. al. I have one remaining question: What's the point? The "replication" disk file is not, from what I can ascertain, bootable. I expect this operation to create a pristine copy of my source qcow2 file (at a given point in time)

Hi Eric, Thanks for the info. I see the value in this, but it isn't quite what I was looking for. Basically what I want to do is to switch between snapshots quickly. For instance, I am currently working on designing a HA SQL implementation with failover. So right now I have 5 VM's running postgresql as a replication group. I am trying a lot of different things and often have to take a

Am 10.06.13 09:07, schrieb Kashyap Chamarthy: > On 06/09/2013 02:46 PM, Thomas Stein wrote: >> Hello. >> >> I just tried the following: >> >> virsh dumpxml --security-info gentoo-template > gentoo-template.xml >> virsh snapshot-create gentoo-template >> virsh undefine gentoo-template > > Wait - is that really the command you used after

Hi all, Where could I find the memory dump and disk snapshots for vm after command "virsh snapshot-create <some_running_vm>"? Thanks in advance. I found the xml files in /var/lib/libvirt/qemu/snapshot/, but hava no idea about the raw snapshot file. Thanks, Lei -------------- next part -------------- An HTML attachment was scrubbed... URL:

I had test the command virsh blockcommit, but it failed, with the libvirt version 1.1.0, and qemu version 1.6.0. Is this feature being developing? Thanks root at cvk-31:/vms/images# virsh -v 1.1.0 root at cvk-31:/vms/images# qemu-img -V qemu-img version 1.6.0, Copyright (c) 2004-2008 Fabrice Bellard usage: qemu-img command [command options] root at cvk-31:/vms/images# virsh blockcommit Vmtest

Hello. I just tried the following: virsh dumpxml --security-info gentoo-template > gentoo-template.xml virsh snapshot-create gentoo-template virsh undefine gentoo-template virsh blockcopy gentoo-template vda /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2 --wait --verbose --finish virsh define gentoo-template.xml virsh snapshot-delete gentoo-template --current But if i

Versions -------- (Libvirt locally built from a recent git commit -ec7b922): $ rpm -q libvirt-daemon-kvm qemu-system-x86 libvirt-daemon-kvm-1.2.6-1.fc20.x86_64 qemu-system-x86-2.0.0-1.fc21.x86_64 Test ---- [All images are qcow2 files.] We have this simple chain: base <- snap1 Let's quickly examine the contents of 'base' and 'snap1' images: