- Users - libvirt List Archives

[libvirt-users] Questions regarding migration from QEMU to libvirt
by Rodrigo Siqueira 06 Nov '18

06 Nov '18

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-70617d452b0… 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-70617d452b0… * The configuration file that we adopted as a default: https://github.com/rodrigosiqueira/kworkflow/pull/23/files#diff-d8c16482496… 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

2 3

[libvirt-users] Hello World
by Ameya Sinha 06 Nov '18

06 Nov '18

Hello Everyone! I'm Ameya Sinha, a student, and I wanted to contribute to the libvirt organization. I have read through the contributing guidelines ( https://libvirt.org/contribute.html) and contributor guidelines ( https://libvirt.org/hacking.html) Can someone suggest how should I proceed from here? Thank You, Ameya Sinha

3 2

[libvirt-users] Windows guest skipping chkdsk if using Spice display
by Gionatan Danti 05 Nov '18

05 Nov '18

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-s… 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

2 3

[libvirt-users] How to change the default connection of 'virsh' tool from 'qemu' to 'xen' ?
by Minjun Hong 02 Nov '18

02 Nov '18

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.

4 5

[libvirt-users] Read CPU Performance Statistics
by Hana Yehia 02 Nov '18

02 Nov '18

Hi, I am in need for a help for how to use libvirt in python to read the the guest VMs performance statistics like cache hit and miss rates , I have KVM- Qemu as a virtual machine manager , I am looking for a sample code or the instructions needed to help me read these statistics . Thanks, hana

1 0

[libvirt-users] Xen via libvirt
by Minjun Hong 31 Oct '18

31 Oct '18

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.

2 4

[libvirt-users] how to use LV(container) created by lxc-create?
by lejeczek 21 Oct '18

21 Oct '18

hi everyone, how can I use a LV created by lxc in libvirt guest domain? You know, you lxc-create with LV as backstore for a container(ubuntu in my case) and now you want to give to libvit. That, I thought would be a very common case but I failed to find a good howto on how one: lxc-create(lvm) => let libvirt take control over it. Or it's not how you would do it at all? many thanks, L.

2 1

[libvirt-users] LXC with --filesystem - control/impose filesystem(/ in container) size limits - how?
by lejeczek 20 Oct '18

20 Oct '18

hi guys container was created off a template with --dir. Is it even possible? I mean, as it is with filesystem, without moving/migrating to LVM, ZFS, etc? The very brute solution which comes to my mind - xfs project quotas - if it even could work. But that outside of libvirt/lxc. many thanks, L.

1 0

[libvirt-users] KVM + libvirt + nftables without iptables?
by Roman Vesely 19 Oct '18

19 Oct '18

Hi everyone, I use Debian 9.5 Stretch and NFTABLES as a firewall. Using NFTABLES together with IPTABLES is not recommended, but libvirt depends on IPTABLES. Is it safe to run libvirt + kvm + virsh without IPTABLES? By the doc https://libvirt.org/firewall.html, IPTABLES are used for settingup filtering which I do not need. Thanks, Roman

3 4

[libvirt-users] pcie-expander-bus doesn't support pcie-pci-bridge and pcie-switch-upstream-port
by Han Han 18 Oct '18

18 Oct '18

In libvirt, I found pcie-expander-bus controller doesn't support pcie-to-pci-bridge and pcie-switch-upstream-port. Version: libvirt-4.9 # cat /tmp/c.xml ... <controller type='pci' index='0' model='pcie-root'/> <controller type='pci' index='1' model='pcie-expander-bus'> <model name='pxb-pcie'/> <target busNr='3'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </controller> <controller type='pci' index='2' model='pcie-to-pci-bridge'> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </controller> ... # virsh -k0 -K0 define /tmp/c.xml error: Failed to define domain from /tmp/c.xml error: XML error: The device at PCI address 0000:01:00.0 cannot be plugged into the PCI controller with index='1'. It requires a controller that accepts a pcie-to-pci-bridge. # cat /tmp/b.xml ... <controller type='pci' index='0' model='pcie-root'/> <controller type='pci' index='1' model='pcie-expander-bus'> <model name='pxb-pcie'/> <target busNr='3'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </controller> <controller type='pci' index='2' model='pcie-switch-upstream-port'> <model name='x3130-upstream'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </controller> ... # virsh -k0 -K0 define /tmp/b.xml error: Failed to define domain from /tmp/b.xml error: XML error: The device at PCI address 0000:01:00.0 cannot be plugged into the PCI controller with index='1'. It requires a controller that accepts a pci-switch-upstream-port. In function virDomainPCIAddressBusSetModel, I find pcie-expander-bus only supports pcie-root-port and dmi-to-pci-bridge 353 case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_EXPANDER_BUS: 354 ┆ /* 32 slots, no hotplug, only accepts pcie-root-port or 355 ┆ ┆* dmi-to-pci-bridge 356 ┆ ┆*/ 357 ┆ bus->flags = (VIR_PCI_CONNECT_TYPE_PCIE_ROOT_PORT | 358 ┆ ┆ ┆ ┆ ┆ VIR_PCI_CONNECT_TYPE_DMI_TO_PCI_BRIDGE); 359 ┆ bus->minSlot = 0; 360 ┆ bus->maxSlot = VIR_PCI_ADDRESS_SLOT_LAST; 361 ┆ break; But it works in qemu: # /usr/libexec/qemu-kvm -machine q35 -m 1024 -device pxb-pcie,bus_nr=250,id=pci.1,bus=pcie.0,addr=0x4 -device pcie-pci-bridge,id=pci.250,bus=pci.1,addr=0x0 -device pcie-pci-bridge,id=pci.251,bus=pci.1,addr=0x1 -spice port=5902,addr=0.0.0.0,disable-ticketing /var/lib/libvirt/images/q35.qcow2 So why pcie-expander-bus doesn't these two controllers? For any concerns in libvirt? Thank you~ -- Best regards, ----------------------------------- Han Han Quality Engineer Redhat. Email: hhan(a)redhat.com Phone: +861065339333

4 4