[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang
Hi guys,
when I detach an interface from vm during boot (vm boot not finished), it
always fail. I'm not sure if there is an existing bug. I have
confirmed with someone that for disk, there is similar behavior, if
this is also acceptable?
# virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2; virsh
detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh
dumpxml rhel7.2 |grep /interface -B9
Domain rhel7.2 destroyed
Domain rhel7.2 started
Interface detached successfully
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:98:c4:a0'/>
<source network='default' bridge='virbr0'/>
<target dev='vnet0'/>
<model type='rtl8139'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
When I detach after the vm boot, expand the sleep time to 10, it will succeed.
# virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10; virsh
detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh
dumpxml rhel7.2 |grep /interface -B9
Domain rhel7.2 destroyed
Domain rhel7.2 started
Interface detached successfully
-------
Best Regards,
Yalan Zhang
IRC: yalzhang
Internal phone: 8389413
2 years, 2 months
[libvirt-users] Question about disabling UFO on guest
by Bao Nguyen
Hello everyone,
I would like to ask a question regarding to disable UFO of virtio vNIC in
my guest. I have read the document at https://libvirt.org/formatdomain.html
*host*
The csum, gso, tso4, tso6, ecn and ufo attributes with possible
values on and off can be used to turn off host offloading options. By
default, the supported offloads are enabled by QEMU. *Since 1.2.9 (QEMU
only)* The mrg_rxbuf attribute can be used to control mergeable rx buffers
on the host side. Possible values are on (default) and off. *Since 1.2.13
(QEMU only)*
*guest*
The csum, tso4, tso6, ecn and ufo attributes with possible
values on and off can be used to turn off guest offloading options. By
default, the supported offloads are enabl
ed by QEMU.
*Since 1.2.9 (QEMU only)*
Then I disabled UFO on my vNIC on guest as the following configuration
<devices>
<interface type='network'>
<source network='default'/>
<target dev='vnet1'/>
<model type='virtio'/>
<driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off'
queues='5' rx_queue_size='256' tx_queue_size='256'>
*<host gso='off' ufo='off' />*
*<guest ufo='off'/>*
</driver>
</interface>
</devices>
Then I reboot my node to get the change effect and it works. However, can I
disable the UFO without touching the host OS? or it always has to disable
on both host and guest like that?
Thanks,
Brs,
Natsu
4 years, 3 months
[libvirt-users] lvm vs qcow (on NVMe)
by lejeczek
hi guys,
anybody observed, maybe has measured performance difference between the
two with qemu quests(windows OS)?
Any conclusions, recommendations?
many thanks, L.
6 years
[libvirt-users] Libvirt access control drivers
by Anastasiya Ruzhanskaya
Hello!
According to the documentation access control drivers are not in really
"good condition". There is a polkit, but it can distinguish users only
according the pid. However, I have met some articles about more
fine-grained control and about selinux drivers for libvirt? So, what is the
status now? Should I implement something by myself if I want access based
on login, are their instructions how to write these drivers or there is
smth already?
6 years
[libvirt-users] libvirt with persistent device names
by Jan Marquardt
Hi,
I am trying to create a logical volume storage pool with persistent
device names for the block devices, because I can't/don't want to ensure
that /dev/sd* names are persistent through reboots.
virsh # pool-define-as web2067 logical - -
/dev/disk/by-path/pci-0000:18:00.0-scsi-0:2:2:0 web2067 /dev/web2067
virsh # pool-build web2067
These two steps work as expected and the pv and the vg get created, but
when I try to start the pool I get the following error:
virsh # pool-start web2067
error: Failed to start pool web2067
error: unsupported configuration: cannot find any matching source
devices for logical volume group 'web2067'
If I do the same steps just with /dev/sdX instead of
/dev/disk/by-path/..., the pool gets created correctly.
This looks like a bug for me or am I wrong? If this is the case, is this
and known issue and fixed in later versions?
I am running Ubuntu 18.04 with libvirt in version 4.0.0.
Best Regards
Jan
6 years
[libvirt-users] Questions regarding migration from QEMU to libvirt
by Rodrigo Siqueira
Hi,
My colleagues and I have a set of scripts that we use to automate our
daily tasks related to the Linux Kernel. As a result, most of our code
relies on the QEMU features; and recently we decided use libvirt instead
of QEMU. However, we have some questions, and I would like to know if
someone could help us. Follows:
1) Import our QEMU images with virsh
Currently, we import the QEMU VMs with virt-install.
Is it possible to automatically discover the distro variant of a QEMU
image in order to use it in the “--os-variant” option?
Here is how we register a VM:
https://github.com/rodrigosiqueira/kworkflow/pull/23/files#diff-70617d452...
2) The requirement of sudo to create a network
When we register our VM, we want to keep the ssh working well. However,
every time we register a VM we create a new network bridge as a result
it requires sudo. Is it possible to avoid this? Or at least make this a
single action?
Here is how we handled this:
* The code for register:
https://github.com/rodrigosiqueira/kworkflow/pull/23/files#diff-70617d452...
* The configuration file that we adopted as a default:
https://github.com/rodrigosiqueira/kworkflow/pull/23/files#diff-d8c164824...
3) When using libvirt it changes the owner of our image
If we try to use libvirt, it changes the ownership of our QEMU images
(root). We fixed it by changing the file “/etc/libvirt/qemu.conf”, and
switch the option dynamic_ownership to “0”. What is the impact of that
change? Is it dangerous? There is a way to avoid this change?
Finally, here is the full code of the libvirt part:
https://github.com/rodrigosiqueira/kworkflow/pull/23/files
Thanks
Best Regards
--
Rodrigo Siqueira
http://siqueira.tech
Graduate Student
Department of Computer Science
University of São Paulo
6 years
[libvirt-users] Windows guest skipping chkdsk if using Spice display
by Gionatan Danti
Hi all,
as per subject, when a Windows guest using a Spice display is rebooted
with a planned chkdsk, the consistency check is always skipped.
It seems that the Spice display issues some "phantom" keystrokes, which
are then intended by Windows as the "skip chkdsk at boot" signal.
I tried to use a Spice display with no additional features (ie: USB
redirection), but to no avail. To workaround the problem I must use a
VNC display, which is less featureful than the Spice one.
My system and package versions are:
CentOS 7.5 x86-64
spice-gtk3-0.34-3.el7_5.1.x86_64
spice-server-0.14.0-2.el7_5.4.x86_64
spice-glib-0.34-3.el7_5.1.x86_64
libvirt-3.9.0-14.el7_5.7.x86_64
qemu-kvm-ev-2.10.0-21.el7_5.4.1.x86_64
It seems I am not the only one experiencing this problem:
http://seifesrants.blogspot.com/2016/07/ghost-keystrokes-with-libvirt-kvm...
Any suggestion?
Thanks.
--
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti(a)assyoma.it - info(a)assyoma.it
GPG public key ID: FF5F32A8
6 years
[libvirt-users] How to change the default connection of 'virsh' tool from 'qemu' to 'xen' ?
by Minjun Hong
Hi.
Thanks to help of this mailing list (especially Jim Fehlig), I have
finished setup of libvirt.
However, there is something weird. It is that I installed libvirt on 5
servers but
the default connection of one of them is 'qemu:///' even if those of the
others are all 'xen:///'.
I searched how to change it but, I only found a bypass adding "
LIBVIRT_DEFAULT_URI='xen:///' " in my .bashrc file.
Currently, value of the variable (LIBVIRT_DEFAULT_URI) is set to 'qemu:///'.
Since the bypass makes the virtualization type of the server visible 'qemu'
to the open stack, I have to change libvirt configuration.
I also checked some configure files under '/etc/libvirt', such
as libvirt.conf, libvirtd.conf and libxl.conf.
But I have no idea, how and what to change.
Please give me some advise. It will be a big help for me.
Thanks.
6 years
[libvirt-users] Xen via libvirt
by Minjun Hong
Hello.
I want to use libvirt for toolstack of Xen (not XenServer) to set up
Openstack system but,
I'm new to libvirt so, I had some troubles on installing libvirt.
I downloaded the source code, build and installed it, following here (
https://libvirt.org/compiling.html).
However, when I type a command (# virsh 'xen:///system' list) to check if
libvirt has been installed successfully,
I can see an error message:
error: failed to connect to the hypervisor
> error: internal error: libxenlight state driver is not active
Of course, I confirmed that Xen was working well:
root@node1:/home/nickeys# xl list
> Name ID Mem VCPUs State
> Time(s)
> Domain-0 0 95656 32 r-----
> 5888.0
And I'm wondering why 'Using API' below is QEMU. How can I change that to
Xen ?
root@node1: /home/nickeys# virsh version
> Compiled against library: libvirt 4.9.0
> Using library: libvirt 4.9.0
> Using API: QEMU 4.9.0
> Running hypervisor: QEMU 2.11.1
I'm using libvirt 4.9, Xen 4.12 (the current latest) and Linux
kernel 4.16.1.
I want to know how to make the 'libxenlight state driver' active.
Please let me know where I should check first to fix this wrong state, or
any tip is also okay.
Thanks.
6 years
