- Users - libvirt List Archives

[libvirt-users] Hello ,How Can I do USB emulation
by Gary 04 May '18

04 May '18

I have a usb.img file, and i want to create a usbdisk(USB emulation) for vpc in a kvm server. I found something like this: qemu-system-x86_64 -device piix3-usb-uhci \ -drive id=my_usb_disk,file=usbdisk.img,if=none \ -device usb-storage,drive=my_usb_disk but i want to do it in a xml files for libvirt. i did not find any example for it. how can i do it thank u very much.

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[libvirt-users] libvirt does not see a firewall backend
by Stallard, Adam 04 May '18

04 May '18

Hi, I am working with libvirt on a small buildroot image and can't get a network to start: $ virsh net-list -all Default inactive yes yes $ virsh -debug=4 net-start default Error: Failed to start network default Error: internal error: Failed to initialize a vlid firewall backend Reading the source in libvirt-3.7.0/src/util/virfirewall.c, I believe libvirt is checking for iptables, ip6tables, and ebtables, all of which I have installed on the system in the proper directories (according to the *_PATH macros used by libvirt code). By removing network configuration from my domain configuration, I can start a VM just fine and see it running with virsh. But it will not start if the network is configured. What do I need to do to fix the "firewall backend" configuration so that libvirt recognizes and accepts my host configurations (iptables / ebtables)? They are installed from standard packages included with buildroot. Thank you.

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[libvirt-users] connecting host and guest vm using a dummy nic
by daggs 03 May '18

03 May '18

Greetings all, I have a host machine that runs a router within a vm. I want to allow a connection between the host and the guest so the host can connect to the lan provided by the router vm. I've created a dummy interface with these commands: $ ip link add ens99-dummy type dummy $ ip link set ens99-dummy address 52:54:00:1f:d0:ff this resulted with this output: $ ifconfig ens99-dummy ens99-dummy Link encap:Ethernet HWaddr 52:54:00:1F:D0:FF inet6 addr: fe80::84b5:24ff:fe62:c16d/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:899 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:321727 (314.1 KiB) in my libvirt's xml file I have this entry: <interface type='direct'> <mac address='52:54:00:0c:cb:3e'/> <source dev='ens99-dummy' mode='private'/> <target dev='macvtap0'/> <model type='e1000'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/> </interface> after the vm is up, I see the adapter in the vm and the host has one more entry: $ ifconfig macvtap0 macvtap0 Link encap:Ethernet HWaddr 52:54:00:0C:CB:3E inet6 addr: fe80::5054:ff:fe0c:cb3e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:889 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:320523 (313.0 KiB) but when I try to request ip via dhcp from both macvtap0 and ens99-dummy I don't get any. any idea why?

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[libvirt-users] manually install a machine (no virt-install)
by Stallard, Adam 03 May '18

03 May '18

Hi, I'm wondering if there are any guides to connecting a qemu image to libvirt without using any virt-manager tools. I wish to send poweroff / on signals to the machine, and it seems all I need to do so is the libvirt library. I'm working on building an embedded platform where the images are generated in a cross-compiled environment. I'm hoping I can integrate them into libvirt's scope without the use of virt-manager tools like virt-install. As far as I can tell, I need to hand write /etc/libvirt/qemu/myimages.xml and /etc/libvirt/qemu/networks/myimagenetworks.xml. Is this feasible? If the machines are started up at boot time using qemu-system-x86_64, will these libvirt "profiles" provide a domain for libvirt visibility? I am trying to avoid adding virt-manager / python as a dependency to our host image as working with the dependency chain has been hellish so far. Adam

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[libvirt-users] Running ChromiumOS on libvirt
by Tony Arnold 03 May '18

03 May '18

Has anyone had any success running ChromiumOS as a VM under libvirt and can provide, or point me to, a set of instructions for getting it to work? I've tried and get as far as the white boot screen with the Chromium logo, but the VM just hangs there. Regards, Tony. -- Tony Arnold MBCS, CITP | Senior IT Security Analyst | Directorate of IT Services | Desk 51, Office 2, Kilburn Building | The University of Manchester | Manchester M13 9PL | T: +44 161 275 6093 | M: +44 773 330 0039

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[libvirt-users] Drive-backup functions.
by Matthew Schumacher 02 May '18

02 May '18

List, Two years ago there was discussion on implementing QEMU's block-dirty-bitmap backup solution: https://www.redhat.com/archives/libvir-list/2016-June/msg00380.html https://www.redhat.com/archives/libvir-list/2016-April/msg00401.html But I haven't seen anything since, and looking through git, it doesn't look like any of these patches were included. Can someone please bring me up to speed on what is up with these patches and what the current thinking is in regards to backing up with libvirt? Currently I'm snapshotting, then syncing the quiesced base image to one I have on alternate media, but it's slow and takes up a lot of space. Thanks, schu

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[libvirt-users] Server 2016 locked in paused state
by Paul O'Rorke 02 May '18

02 May '18

Hi all, I have a number of production Windows servers on KVM/DRBD and two of them are Server 2016. Both these guests have started exhibiting the same behaviour where they enter a paused state and will not resume. The behaviour is the same whether I use virsh or virt-manager. My only recourse is to force the guest off and start it again. This brings the host up temporarily where upon it pauses again. It could be minutes or hours but it always returns to being stuck in this paused state. I'm not seeing anything much in /var/log/kern.log or syslog - perhaps I'm missing the clue. Has anyone else seen this and or can you advise me where I should be looking to find the cause of this? Sincerely -- *Paul O'Rorke* *Tracker Software Products (Canada) Limited * www.tracker-software.com <http://www.tracker-software.com/> Tel: +1 (250) 324 1621 Fax: +1 (250) 324 1623 <http://www.tracker-software.com/> Support: http://www.tracker-software.com/support Download latest Releases http://www.tracker-software.com/downloads/

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[libvirt-users] LibVirt "make install" after successful compilation
by Azizul Hakim 01 May '18

01 May '18

I am having some issue with LibVirt installation from source code. I downloaded the latest code from git, was able to configure and compile it. But when I try to install it using *sudo make installi, *I get the following errors. Making install in po make[1]: Entering directory '~/libvirt/po' make[2]: Entering directory '~/libvirt/po' make[2]: Nothing to be done for 'install-exec-am'. make install-data-hook make[3]: Entering directory '~/libvirt/po' make[3]: *** No rule to make target 'af.gmo', needed by 'install-data-hook'. Stop. make[3]: Leaving directory '~/libvirt/po' Makefile:2027: recipe for target 'install-data-am' failed make[2]: *** [install-data-am] Error 2 make[2]: Leaving directory '~/libvirt/po' Makefile:1981: recipe for target 'install-am' failed make[1]: *** [install-am] Error 2 make[1]: Leaving directory '~/libvirt/po' Makefile:2105: recipe for target 'install-recursive' failed make: *** [install-recursive] Error 1 As I mentioned, there is no error during compiling the source code. It would be helpful if someone could point me in a direction so I can figure out the problem. Thanks Azizul Hakim

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[libvirt-users] [libvirt] ignore_value
by gaosheng cui 28 Apr '18

28 Apr '18

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!

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[libvirt-users] qemu crash, qemu_thread_create: Resource temporarily unavailable
by llilulu 26 Apr '18

26 Apr '18

Hi My qemu is 2.9.0, libvirt is 3.4.0. I start many guest in short time(128G pyhsical memory ,1G per guest, 90 guest), and then run memtest on guest system.memtest just occupy guest memory，so when run memtest, host will allocate memory for guest. I run memtest on all my guest, and some guest will encounter crash. qemu log has qemu_thread_create: Resource temporarily unavailable record，I ask same question before, replier suggest I change qemu.conf max_process arg, but I cat /proc/$pid/limits, I find maxprocess limit is very big, I don't think is the args restrict. I think is when I run memtest on all guest, the host pressure very highly in short time, because when I run memtest on all guest, i encounter some other program core, I use gdb debug the core, I find is dump in allocate memory. so I want known qemu crash is that reason, and how host system acceptable pressure limit. when I encounter qemu crash, what can I do avoid the promble. Thanks

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