[libvirt-users] share nothing live migration causes read only filesystem
by Fırat KÜÇÜK
Hello,
I started live migration job for a guest with the following command:
virsh migrate --live --domain my-guest --verbose --persistent --copy-storage-all --desturi qemu+ssh://root@my-otherhost/system
Guest system disk cache mode is none:
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/opt/datastore/bulutkare-1118.img'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
after live migration completed, filesystem blocked write operations.
root@my-guest:~/tmp# touch hello
touch: cannot touch ‘hello’: Read-only file system
What can be the reason? What is the best of migrating a VM to a target
machine?
Additional info:
Guest operating system is Ubuntu 14.04 x64
Source/Target Host operating system is Ubuntu 15.04 x64
Guest file system is ext4 + swap
Source/Target Host file system is XFS
Source/Target Qemu version 1.2.2
Source/Target libvirt 1.2.12
This is from target libvirt log. It can be important:
/build/qemu-Bjjgxn/qemu-2.2+dfsg/nbd.c:nbd_co_receive_request():L1146:
reading from socket failed
8 years, 9 months
[libvirt-users] Re：Re: [help] How to modify the vgamem value ?
by hongzhen_luo＠sina.com
Dear Mr Holger and Mr Pavel
Thanks for your help , I am going to try to modify the vgamem value . ^ ^Have a nice day ...
Best regards
>Hi Pavel,
>I have to apologize. After your post I study the page again and I
>found your descrption.
>Best regards,
>Am 14.03.2016 um 10:20 schrieb Pavel Hrdina:
> On Mon, Mar 14, 2016 at 09:41:36AM +0100, Holger Schranz wrote:
>> Hi Luo,
>>
>> the vgamem is limited inside. Myself, I use QEMU 2.5/Virgil3D to expand
>> the vgamem.
>
> It's not limited and can be modified inside the xml, the only limitation is that
> the value has to be a power of 2 and for QXL the value must be at least 1024.
> There is an exception, qemu can and in some cases updates the value internally,
> libvirt after the guest is started will get the actual value from qemu and
> update live XML.
>
> Pavel
>
8 years, 9 months
[libvirt-users] Unsupported network type ethernet using LXC
by abhishek jain
Hi Team
I'm trying to launch VM using LXC as a hypervisor with interace="ethernet"
configuration and I'm getting below errors..
*virsh -c lxc: start instance-00000321error: Failed to start domain
instance-00000321error: internal error: Unsupported network type ethernet*
Below is the xml file which I'm using ....
cat right.xml
<domain type='lxc'>
<name>instance-00000321</name>
<uuid>13dd822c-a99d-4f28-9f4e-53dfb744efcc</uuid>
<memory unit='KiB'>524288</memory>
<currentMemory unit='KiB'>524288</currentMemory>
<vcpu placement='static'>1</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='aarch64' machine='virt'>exe</type>
<init>/bin/sh</init>
<cmdline>root=/dev/ram0 rw console=ttyAMA0 rootwait
earlyprintk</cmdline>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/lib/libvirt/libvirt_lxc</emulator>
<filesystem type='mount' accessmode='passthrough'>
<source dir='/'/>
<target dir='/'/>
</filesystem>
<interface type='ethernet'>
<mac address='02:74:ff:9d:52:f5'/>
<script path=''/>
<target dev='tap74ff9d52-f5'/>
</interface>
<interface type='ethernet'>
<mac address='02:9b:a6:1e:67:5b'/>
<script path=''/>
<target dev='tap9ba61e67-5b'/>
</interface>
<console type='pty'>
<target type='lxc' port='0'/>
</console>
</devices>
<seclabel type='none'/>
</domain>
However I'm able to launch the same above xml file using KVM as hypervisor
on the same host.
Please help me regarding this.
--Thanks
Abhishek Jain
8 years, 9 months
[libvirt-users] TCP Tunnel Info
by bancfc＠openmailbox.org
libvirt-users(a)redhat.com
TCP Tunnel Info
I've been looking at the TCP Tunnel network feature as a potential
replacement for the extra private internal networking configuration
file.
Usecase: This network is supposed to go from VM1 to VM2 without DHCP,
DNS or any incoming/outgoing connections to the host or outside world
possible.
https://libvirt.org/formatdomain.html#elementsNICSTCP
* To make sure I understand, adding the TCP Tunnel setting for both VMs
1 and 2 is enough to do what I need? (force them to exclusively
communicate without the need for adding a new network as typically
done).
* If another set of VMs 3 and 4 are running and connected to each other
but I want to make sure they cannot connect to VMs 1 and 2, what source
addresses should be used to isolate these 2 networks? Do you follow CIDR
rules?
* For example if the chosen source address is 10.152.152.11 for VMs 1
and 2 what should the other network have?
* Going more complicated. Can one VM participate in two separate TCP
Tunnel networks while keeping them isolated? Topology: VM1(virtual NIC1)
<-> VM2 | VM1(virtual NIC2) <-> VM3
VM2 and 3 can only talk to VM1 but not to each other in this example.
* Offtopic: Do your answers similarly apply for using the other
Multicast and UDP options too?
I can explain better if I'm not making any sense.
8 years, 9 months
[libvirt-users] [help] How to modify the vgamem value ?
by hongzhen_luo＠sina.com
Dear everyone
Do you know how to modify vgamem value in the .xml file ? such as :<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/> // from instance-0000015e.xml
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/</video>
I plan to increase the volume of vgamem , but it seems that always keep the original value ‘16384’. Was it limited by QEMU? or others？ Please tell me how I can I modify it ? it's better that help me to make a example for modifing the vgamem.....
Thank you very much
Best Regards .
8 years, 9 months
[libvirt-users] Where are libvirt's USB autroredirection settings stored?
by bancfc＠openmailbox.org
For security reasons Debian's libvirt maintainer has opted to disable
the default behavior of autoredirecting any newly attached USB device to
a running VM with SPICE USB redirection ports added.
I tried looking for an obvious setting in virt-manager's menus to change
this but can't see anything. What libvirt/virt-manager configuration
file is this setting stored so I can change it on demand?
8 years, 9 months
[libvirt-users] 100% CPU when using nested virtualization
by Digimer
Hi all,
I got a new laptop recently and what worked before no longer works
(Fedora 23 on the laptops in both cases)...
I'm trying to get nested virtualization to work because I use the VMs
on the laptop to simulate an HA cluster that itself hosts VMs. I don't
care much at all about the performance of the nested VM, it's just there
so that I can work on the cluster's code.
When I try to provision a VM inside a VM (the host VM is CentOS/RHEL
6.7), the CPU load spikes to such a high degree that my ssh session
times out after a while. The VM appears in libvirtd (as viewed by
virt-manager on another machine), but the VM itself never starts.
In one case, the VM host remained somewhat functional and killing
kvm/qemu/libvirtd didn't reduce the CPU load.
The main difference between the setups is that the older laptop had a
Sandy bridge(? Thinkpad W530) and the new laptop is a Broadwell
(Thinkpad P70).
I've tried to loading vhost_net without much luck. I have, of course,
enabled nesting on the actual hardware:
cat /sys/module/kvm_intel/parameters/nested
Y
Any tips on how to debug?
I'm in quite a pickle with this, so any and all help is much appreciated.
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?
8 years, 9 months
[libvirt-users] EPT Misconfiguration
by Andrei Perietanu
I am using libvirt 1.2.20. I noticed that when running some VMs (CentOS )
with 2G ram, 2CPUs each for some reason they go from 'state=running' to
'state=paused'; and they can't be restarted. They are un-usable.
When this happens I get the following in dmesg output:
[ 46.595265] EPT: Misconfiguration.
[ 46.595271] EPT: GPA: 0xfee000b0
[ 46.595275] ept_misconfig_inspect_spte: spte 0x7e4968107 level 4
[ 46.595279] ept_misconfig_inspect_spte: spte 0x7e4961107 level 3
[ 46.595281] ept_misconfig_inspect_spte: spte 0x7e4960107 level 2
[ 46.595284] ept_misconfig_inspect_spte: spte 0x7e592ff77 level 1
I have seen discussions about this topic, but for older code versions.
The problem happens often and I could not find a fix for it.
Has anyone seen this?Is there a fix for it?
Thanks,
Andrei
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8 years, 9 months
