March 2018 - Users - libvirt List Archives

[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang 08 Sep '22

08 Sep '22

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

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[libvirt-users] Question about disabling UFO on guest
by Bao Nguyen 05 Aug '20

05 Aug '20

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

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[libvirt-users] ceph rbd pool and libvirt manageability (virt-install)
by Jelle de Jong 29 Aug '18

29 Aug '18

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everybody, I created a rbd pool and activated it, but I can't seem to create volumes in it with virsh or virt-install? # virsh pool-dumpxml myrbdpool <pool type='rbd'> <name>myrbdpool</name> <uuid>2d786f7a-2df3-4d79-ae60-1535bcf1c6b5</uuid> <capacity unit='bytes'>6997998301184</capacity> <allocation unit='bytes'>10309227031</allocation> <available unit='bytes'>6977204658176</available> <source> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> <name>libvirt-pool</name> <auth type='ceph' username='libvirt'> <secret uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> </source> </pool> # virt-install --version 1.0.1 # virsh --version 1.2.9 I ended using virsh edit ceph-test.powercraft.nl and making creating the disk manually. <disk type='network' device='disk'> <auth username='libvirt'> <secret type='ceph' uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> <source protocol='rbd' name='libvirt-pool/kvm01-storage'> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> </source> <target dev='vdc' bus='virtio'/> </disk> I use virt-install a lot to define, import and undefine domains, how can I use virt-install to manage my rdb disks? Kind regards, Jelle de Jong -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iJwEAQECAAYFAlV1xlQACgkQ1WclBW9j5HkbPQP+PjNrzvlqysslOp2Yk7wH4Mxy 2sh2dn96G0KOAHEeEn3BN6IWlnD1TADZbHdpTtMwkdv48Xwn0sP1s+3QDM4pb3gP n+z+dVxS8FouDIy/eiso3IBCj3g4TWbEX8ZHqs3jKqe0lZgAXBzB9xYSUowcEBrZ ddkPbr8p8ozWyOG+9V8= =lkK7 -----END PGP SIGNATURE-----

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[libvirt-users] virRandomBits - not very random
by Brian Rak 01 Jun '18

01 Jun '18

I just ran into an issue where I had about 30 guests get duplicate mac addresses assigned. These were scattered across 30 different machines. Some debugging revealed that: 1) All the host machines were restarted within a couple seconds of each other 2) All the host machines had fairly similar libvirtd pids (within ~100 PIDs of each other) 3) Libvirt seeds the RNG using 'time(NULL) ^ getpid()' This perfectly explains why I saw so many duplicate mac addresses. Why is the RNG seed such a predictable value? Surely there has to be a better source of a random seed then the timestamp and the pid? The PID seems to me to be a very bad source of any randomness. I just ran a test across 60 of our hosts. 43 of them shared their PID with at least one other machine.

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[libvirt-users] Create qcow2 v3 volumes via libvirt
by Gionatan Danti 25 May '18

25 May '18

Hi all, on a fully patched CentOS 7.4 x86-64, I see the following behavior: - when creating a new volumes using vol-create-as, the resulting file is a qcow2 version 2 (compat=0.10) file. Example: [root@gdanti-lenovo vmimages]# virsh vol-create-as default zzz.qcow2 8589934592 --format=qcow2 --backing-vol /mnt/vmimages/centos6.img Vol zzz.qcow2 created [root@gdanti-lenovo vmimages]# file zzz.qcow2 zzz.qcow2: QEMU QCOW Image (v2), has backing file (path /mnt/vmimages/centos6.img), 8589934592 bytes [root@gdanti-lenovo vmimages]# qemu-img info zzz.qcow2 image: zzz.qcow2 file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 196K cluster_size: 65536 backing file: /mnt/vmimages/centos6.img backing file format: raw Format specific information: compat: 0.10 refcount bits: 16 - when creating a snapshot, the resulting file is a qcow2 version 3 (comapt=1.1) file. Example: [root@gdanti-lenovo vmimages]# virsh snapshot-create-as centos6left --disk-only --no-metadata snap.qcow2 Domain snapshot snap.qcow2 created [root@gdanti-lenovo vmimages]# file centos6left.snap.qcow2 centos6left.snap.qcow2: QEMU QCOW Image (v3), has backing file (path /mnt/vmimages/centos6left.qcow2), 8589934592 bytes [root@gdanti-lenovo vmimages]# qemu-img info centos6left.snap.qcow2 image: centos6left.snap.qcow2 file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 196K cluster_size: 65536 backing file: /mnt/vmimages/centos6left.qcow2 backing file format: qcow2 Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false From what I know, this is a deliberate decision: compat=1.1 requires relatively recent qemu version, and creating a new volume play on the "safe side" of compatibility. It is possible to create a new volume using qcow2 version 3 (compat=1.1) format *using libvirt/virsh* (I know I can do that via qemu-img)? Any drawback on using version 3 format? 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

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[libvirt-users] User name / session idin logs
by Anastasiya Ruzhanskaya 07 May '18

07 May '18

Hello everyone, I have a question about logging. I need to find out whether it is possible to see user id/session id inside logs or somewhere else. It is not passed in structured across the network, so where should I look to find out, which user (which session) is currently performing the actions?

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[libvirt-users] Possible to edit/apply nwfilter at runtime?
by Andre Goree 03 Apr '18

03 Apr '18

I'm trying to determine if it's possible to edit/attach/apply nwfilter rules at runtime? I.e., after a VM is already running, can I apply a nwfilter to the VM and have it work without rebooting the machine? Thus far, I've not come across a way to do so, but I thought I'd ask here before I chase my tail around Google. Thanks! -- Andre Goree -=-=-=-=-=- Email - andre at drenet.net Website - http://blog.drenet.net PGP key - http://www.drenet.net/pubkey.html -=-=-=-=-=-

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[libvirt-users] Using alias under disk in XML
by Andre Goree 31 Mar '18

31 Mar '18

I've been trying to follow the information found here [1] in order to provide an alias for RBD disks I'm defining, however it does not appear to be working and I wanted to see if I was doing something wrong. I define the alias like so (using 'virsh edit'): <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='writeback' error_policy='stop' discard='unmap'/> ...truncated... <alias name='ua-test'/> </disk> However, when I then 'virsh dumpxml {guest}', the alias is not there. There is no error given after my edits are made and saved. It just seems that libvirt is completely ignoring or removing my changes, without reason. Can anyone give any insight on why this might be happening, and/or help me with the proper way of defining the alias? 1 - https://libvirt.org/formatdomain.html -- Andre Goree -=-=-=-=-=- Email - andre at drenet.net Website - http://blog.drenet.net PGP key - http://www.drenet.net/pubkey.html -=-=-=-=-=-

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[libvirt-users] Unable to libvirt wireshark dissector
by Han Han 31 Mar '18

31 Mar '18

Hi guys, I am trying to analyze libvirt rpc protocol by wireshark. But I found wireshark doesn't dissect libvirt packets. Here are my environments operations: 1. Environments: My system: Debian GNU/Linux buster/sid with *kernel-4.15.0-1-amd64* Packages installed: *libvirt0-4.1.0-2-amd64 libvirt-wireshark-4.1.0-2-amd64 wireshark-2.4.5-1-amd64* 2. Libvirt configurations */etc/libvirt/libvirtd.conf*: *listen_tls = 0listen_tcp = 1tcp_port = "16509"auth_tcp = "none"* Libvirtd started with options *--listen* 3. Check wireshark libvirt plugin: Open menu: *Help* --> *About* *wireshark* --> *Plugins*. Libvirt plugin is found: *libvirt.so 4.1.0 dissector /usr/lib/x86_64-linux-gnu/w…rk/plugins/2.4.5/libvirt.so* 4. Set wireshark listening on *lo* interface and filter as 'tcp.port==16509'. Execute virsh command via tcp protocol: $ virsh -c qemu+tcp://localhost/system list In wireshark, packets are parsed as TCP protocol. And I cannot find Libvirt protocol in 'Decode as..' protocols list. And libvirt protocol is also not found in *Edit* --> *Preference* --> *Protocols*. So it seems libvirt packets are not dissected as libvirt protocol in wireshark. How can I use the wireshark libvirt plugin? -- Best regards, ----------------------------------- Han Han Quality Engineer Redhat. Email: hhan(a)redhat.com Phone: +861065339333 <+86%2010%206533%209333>

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[libvirt-users] nwfilter multiple IPs
by Andre Goree 31 Mar '18

31 Mar '18

I'm trying to apply a nwfilter rule for two networks on the same guest interface, like so: ~ # virsh nwfilter-dumpxml 1081532-private-both <filter name='1081532-private-both' chain='root'> <uuid>16004b94-2b62-4568-9467-169908eb4040</uuid> <rule action='accept' direction='in' priority='500'> <ip srcipaddr='10.25.104.0' srcipmask='24'/> </rule> <rule action='accept' direction='in' priority='600'> <ip srcipaddr='10.117.50.0' srcipmask='24'/> </rule> <rule action='drop' direction='in' priority='1000'/> </filter> Within the guest, the IPs are both setup on one interface, with the IP for second network (10.117.50.0/24) configured as an alias, like so: 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:00:0a:d0:4e:f3 brd ff:ff:ff:ff:ff:ff inet 10.25.104.1/24 brd 10.25.104.255 scope global eth1 valid_lft forever preferred_lft forever inet 10.117.50.1/24 brd 10.117.50.255 scope global eth1:0 valid_lft forever preferred_lft forever inet6 fe80::200:aff:fed0:4ef3/64 scope link valid_lft forever preferred_lft forever The problem I'm running into is that after applying the nwfilter, I cannot reach the second network, only the first. Is this an issue with both IPs being on the same interface? The machine I'm attempting to reach has the same exact configuration -- i.e. it has an IP on the same network for both networks. Thanks in advance for any advice that can be given. -- Andre Goree -=-=-=-=-=- Email - andre at drenet.net Website - http://blog.drenet.net PGP key - http://www.drenet.net/pubkey.html -=-=-=-=-=-

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[libvirt-users] snapshot of a raw file - how to revert ?
by Lentes, Bernd 29 Mar '18

29 Mar '18

Hi, i have the following system: pc59093:~ # cat /etc/os-release NAME="SLES" VERSION="11.4" VERSION_ID="11.4" PRETTY_NAME="SUSE Linux Enterprise Server 11 SP4" ID="sles" ANSI_COLOR="0;32" CPE_NAME="cpe:/o:suse:sles:11:4" pc59093:~ # uname -a Linux pc59093 3.0.101-84-default #1 SMP Tue Oct 18 10:32:51 UTC 2016 (15251d6) x86_64 x86_64 x86_64 GNU/Linux pc59093:~ # rpm -qa|grep -iE 'libvirt|kvm' libvirt-cim-0.5.12-0.7.16 libvirt-python-1.2.5-1.102 libvirt-client-1.2.5-15.3 kvm-1.4.2-47.1 sles-kvm_en-pdf-11.4-0.33.1 libvirt-1.2.5-15.3 I have several guests running with raw files, which is sufficent for me. Now i'd like to snapshot one guest because i make heavy configuration changes on it. >From what i read in the net is that libvirt supports snapshoting of raw files when the guest is shutdown and the file of the snapshot becomes a qcow2. Right ? I try to avoid converting my raw file to a qcow2 file. I can shutdown the guest for a certain time, that's no problem. I don't need a live snapshot. But how can i revert to my previous state if my configuration changes go wrong ? Can i do this with snapshot-revert or do i have to edit the xml file and point the hd again to the origin raw file ? What i found in the net wasn't complete clear. Thanks. Bernd -- Bernd Lentes Systemadministration Institut für Entwicklungsgenetik Gebäude 35.34 - Raum 208 HelmholtzZentrum münchen [ mailto:bernd.lentes@helmholtz-muenchen.de | bernd.lentes(a)helmholtz-muenchen.de ] phone: +49 89 3187 1241 fax: +49 89 3187 2294 [ http://www.helmholtz-muenchen.de/idg | http://www.helmholtz-muenchen.de/idg ] no backup - no mercy Helmholtz Zentrum München

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[libvirt-users] virt-install --connect lxc:///
by ales drtik 29 Mar '18

29 Mar '18

After reboot of the host i have different error message: root@blade1:~# virt-install --connect lxc:/// --name test_LXC --memory 128 --filesystem /home/lxcuser/LXC,/ --init /bin/sh WARNING No operating system detected, VM performance may suffer. Specify an OS with --os-variant for optimal results. Starting install... ERROR internal error: guest failed to start: Failure in libvirt_lxc startup: cannot find init path '/bin/sh' relative to container root: No such file or directory Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect lxc:/// start test_LXC otherwise, please restart your installation. root@blade1:~# ls -al /home/lxcuser/LXC total 24 drwxr-xr-x 6 root root 4096 Mar 28 16:09 . drwxr-xr-x+ 7 lxcuser lxcuser 4096 Mar 28 13:20 .. drwxr-xr-x 2 root root 4096 Mar 28 16:09 dev drwxr-xr-x 2 root root 4096 Mar 28 16:09 .oldroot drwxr-xr-x 2 root root 4096 Mar 28 16:09 proc drwxr-xr-x 2 root root 4096 Mar 28 16:09 sys

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[libvirt-users] virt-install --connect lxc:///
by ales drtik 28 Mar '18

28 Mar '18

Hi, I would like to install LXC container by virt-install. >From man: virt-install \ --connect lxc:/// \ --name container \ --memory 128 \ --filesystem /home/LXC,/ \ --init /bin/sh But my err is: root@blade1:/home/lxcuser/LXC# virt-install --connect lxc:/// --name test_LXC --memory 128 --filesystem \ /home/lxcuser/LXC,/ --init /bin/sh WARNING No operating system detected, VM performance may suffer. Specify an OS with --os-variant for optimal results. Starting install... ERROR internal error: guest failed to start: Failure in libvirt_lxc startup: Failed to create /home/lxcuser/LXC/.oldroot: Invalid argument Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect lxc:/// start test_LXC otherwise, please restart your installation. What is wrong with this?

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[libvirt-users] Attempt to define unprivileged LXC by libvirt
by ales drtik 23 Mar '18

23 Mar '18

Hi, i converted LXC conf to xml by: lxcuser@blade1:~/.local/share/lxc/test_deb$ virsh -c lxc:/// domxml-from- native lxc-tools /home/lxcuser/.local/share/lxc/test_deb/config <domain type='lxc'> <name>test_deb</name> <uuid>cce77799-89fd-41fd-99c1-101e00844e23</uuid> <memory unit='KiB'>65536</memory> <currentMemory unit='KiB'>65536</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='x86_64'>exe</type> <init>/sbin/init</init> </os> <idmap> <uid start='1258512' target='0' count='65536'/> <gid start='1258512' target='0' count='65536'/> </idmap> <features> <capabilities policy='allow'> </capabilities> </features> <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='/home/lxcuser/.local/share/lxc/test_deb/rootfs'/> <target dir='/'/> </filesystem> <interface type='bridge'> <mac address='00:16:3e:ab:21:1b'/> <source bridge='br0'/> <link state='up'/> </interface> </devices> </domain> Now attempt to define by virsh gives this err: lxcuser@blade1:~/.local/share/lxc/test_deb$ virsh -c lxc:/// define tmp/test _deb.xml error: Failed to define domain from /tmp/test_deb.xml error: unsupported configuration: You must map the root user of container Debian stretch. Where am I wrong ?

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[libvirt-users] Network interface name of guest via python API
by Dennis Jacobfeuerborn 23 Mar '18

23 Mar '18

Hi, I'm trying to get some basic data from running guests on a libvirt HV but one thing I'm missing is the name of the network interfaces of the guests. I can get the MAC address from the XML but there seems to be no function to actually get the name of the interface. The only function that comes close is this one: https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainInterfaceAddr… This function requires a parameter that I don't really have enough information about. What is the best way to enumerate a guests interfaces including the name? Regards, Dennis

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[libvirt-users] 回复： Fwd: About libvirt domain snapshot problem(for single disk snapshot)
by James Iter 23 Mar '18

23 Mar '18

My negligence。 -- James Iter 在 2018年3月22日星期四，下午11:02，Dominik Psenner 写道： > I believe that Your mail went to the wrong recipient. As far as I'm > concerned it should have been sent to the libvirt-users mailing list, > shouldn't it? > > > On 2018-03-22 15:55, James Iter wrote: > > Thank your reply. > > I found the method. > > Now, I sharing to you. > > When create snapshot, just add ’no’ value to the ’snapshot’ option with —diskspec. > > As below: > > > > ``` bash > > snapshot-create-as 8x0lbzvS --name sys_disk --disk-only --quiesce --atomic --diskspec "vda,snapshot=external" --diskspec "vdb,snapshot=no" > > ``` > > > > > > -- > > James Iter > > > > > > 在 2018年3月21日星期三，下午6:24，Dominik Psenner 写道： > > > > > (shameless plug) > > > > > > To do automated daily backups of a few machines I wrote a small toolset to get the job done and make it as less a hassle as you can get. The source is on github https://github.com/dpsenner/libvirt-administration-tools/. Use it if you find it useful. > > > > > > Note that I have yet not tested it with multiple disks but the tool uses the output of `virsh dombklst`. In theory that should snapshot all disks of a guest machine. > > > > > > Cheers > > > On Tue, 20 Mar 2018, 19:54 James Iter, <james.iter.cn(a)gmail.com (mailto:james.iter.cn@gmail.com)> wrote: > > > > > > > > Hi, dear friends. > > > > My guest has two disks, vda and vdb. both are qcow2 local file. > > > > When guest running state. > > > > I want to take the vda snapshot of guest(just vda, no include vdb). but I met libvirt do snapshot for all disks of guest. > > > > > > > > About methods as follow: > > > > 1、 > > > > ``` bash > > > > virsh > > > > snapshot-create-as 8x0lbzvS --name sys_disk3 --disk-only --diskspec "vda,snapshot=external" > > > > ``` > > > > ``` result > > > > > > > > [root@10k03 ~]# ls -lh /opt/Images/*sys_disk3 > > > > > > > > > > > > -rw-------. 1 qemu qemu 194K 3月 20 23:27 /opt/Images/00d76a58-9637-4402-9739-21afd1246e06.sys_disk3 > > > > > > > > > > > > -rw-------. 1 qemu qemu 704K 3月 20 23:52 /opt/Images/8d582c1c-355a-4297-9434-2f2f562c77df.sys_disk3 > > > > > > > > > > > > ``` > > > > > > > > 2、 > > > > ``` python > > > > > > > > #!/usr/bin/env python > > > > > > > > > > > > # -*- coding: utf-8 -*- > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > import libvirt > > > > > > > > > > > > import libvirt_qemu > > > > > > > > > > > > import json > > > > > > > > > > > > import sys > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > name = sys.argv[1] > > > > > > > > > > > > print name > > > > > > > > > > > > conn = libvirt.open() > > > > > > > > > > > > dom = conn.lookupByName(name) > > > > > > > > > > > > > > > > > > > > > > > > > > > > xml = """ > > > > > > > > > > > > <domainsnapshot> > > > > > > > > > > > > <name>sysdisk_by_xml</name> > > > > > > > > > > > > <description>By xml</description> > > > > > > > > > > > > <disks> > > > > > > > > > > > > <disk name='vda' snapshot='external'> > > > > > > > > > > > > </disk> > > > > > > > > > > > > </disks> > > > > > > > > > > > > </domainsnapshot> > > > > > > > > > > > > """ > > > > > > > > > > > > > > > > > > > > > > > > > > > > flags = 0 > > > > > > > > > > > > flags |= libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY > > > > > > > > > > > > flags |= libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE > > > > > > > > > > > > > > > > > > > > > > > > > > > > ret = dom.snapshotCreateXML(xmlDesc=xml, flags=flags) > > > > > > > > > > > > ``` > > > > ``` result > > > > > > > > [root@10k03 ~]# ls -lh /opt/Images/*sysdisk_by_xml > > > > > > > > > > > > -rw-------. 1 qemu qemu 194K 3月 20 23:52 /opt/Images/00d76a58-9637-4402-9739-21afd1246e06.sysdisk_by_xml > > > > > > > > > > > > -rw-------. 1 qemu qemu 1.2M 3月 21 00:03 /opt/Images/8d582c1c-355a-4297-9434-2f2f562c77df.sysdisk_by_xml > > > > > > > > > > > > ``` > > > > 。 > > > > > > > > > > > > Then, I searched by google. see your page(https://www.redhat.com/archives/libvirt-users/2013-June/msg00102.html). > > > > > > > > Now, I want to ask you, have you found the method? > > > > > > > > > > > > -- > > > > James Iter > > > > > > > > > > > > _______________________________________________ > > > > libvirt-users mailing list > > > > libvirt-users(a)redhat.com (mailto:libvirt-users@redhat.com) > > > > https://www.redhat.com/mailman/listinfo/libvirt-users > > > > > > > > > > > > > > > > >

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[libvirt-users] Attempt to migrate guest to the same host localhost.localdomain
by llilulu 21 Mar '18

21 Mar '18

Hi My libvirt version is 3.4.0, I migrate guest between two host, The two host have same hostname( hostname cmd output same), I try find solution on Internet, I find someone say host uuid same, But virsh sysinfo output uuid is different, when I change one host's hostname, migrate success. I wish know why, and Can I solution this problem not change hostname. My program use api virDomainMigrateToURI2, flag arg is VIR_MIGRATE_LIVE | VIR_MIGRATE_PEER2PEER . I use virsh migrate --live --p2p. Thanks

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Re: [libvirt-users] Persisting the libvirt guest's reason code.
by Daniel P. Berrangé 21 Mar '18

21 Mar '18

Re-adding the mailing list - please don't take discussions off-list in this way. On Tue, Mar 20, 2018 at 05:14:45PM +0000, Tanmoy Sinha wrote: > Daniel, > > Thanks for your prompt response. I have another question, as soon as I do > virsh save <GuestID> <filename>, the corresponding xml and pid under > /var/run/libvirt/qemu is gone, but the guest still has a definition. At > this point, if I query the domain state (i.e. virsh domstate --reason > <GUESTID>) it reads shutoff(saved). Where does this fetch the reason from, > when the /var/run/libvirt/qemu/Guestname.xml file is gone? Libvirtd > maintains the reason code in-memory? That's true only if the guest has a persistent config file in /etc/libvirt. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|

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[libvirt-users] About libvirt domain snapshot problem(for single disk snapshot)
by James Iter 21 Mar '18

21 Mar '18

Hi, dear friend. My guest has two disks, vda and vdb. both are qcow2 local file. When guest running state. I want to take the vda snapshot of guest(just vda, no include vdb). but I met libvirt do snapshot for all disks of guest. About methods for follow: 1、 ``` bash virsh snapshot-create-as 8x0lbzvS --name sys_disk3 --disk-only --diskspec "vda,snapshot=external" ``` ``` result [root@10k03 ~]# ls -lh /opt/Images/*sys_disk3 -rw-------. 1 qemu qemu 194K 3月 20 23:27 /opt/Images/00d76a58-9637-4402-9739-21afd1246e06.sys_disk3 -rw-------. 1 qemu qemu 704K 3月 20 23:52 /opt/Images/8d582c1c-355a-4297-9434-2f2f562c77df.sys_disk3 ``` 2、 ``` python #!/usr/bin/env python # -*- coding: utf-8 -*- import libvirt import libvirt_qemu import json import sys name = sys.argv[1] print name conn = libvirt.open() dom = conn.lookupByName(name) xml = """ <domainsnapshot> <name>sysdisk_by_xml</name> <description>By xml</description> <disks> <disk name='vda' snapshot='external'> </disk> </disks> </domainsnapshot> """ flags = 0 flags |= libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY flags |= libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE ret = dom.snapshotCreateXML(xmlDesc=xml, flags=flags) ``` ``` result [root@10k03 ~]# ls -lh /opt/Images/*sysdisk_by_xml -rw-------. 1 qemu qemu 194K 3月 20 23:52 /opt/Images/00d76a58-9637-4402-9739-21afd1246e06.sysdisk_by_xml -rw-------. 1 qemu qemu 1.2M 3月 21 00:03 /opt/Images/8d582c1c-355a-4297-9434-2f2f562c77df.sysdisk_by_xml ``` 。 Then, I search by google. see your page(https://www.redhat.com/archives/libvirt-users/2013-June/msg00102.html). Now, I want to ask you, was you found the way? -- James Iter

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[libvirt-users] Persisting the libvirt guest's reason code.
by Tanmoy Sinha 21 Mar '18

21 Mar '18

Hi, I am currently facing an issue with libvirt w.r.t a guest's state and reason code. Precisely following are steps: 1. I have a running guest named *linux-test *on KVM 2. I do a * $> virsh save linux-test linux-saved.dat* 3. At this point * $> virsh domstate --reason linux-test *shows *shutoff(saved)* 4. I restarted the libvirtd daemon * $>systemctl restart libvirtd* 5. Now when I check for the domain state, * $> virsh domstate --reason linux-test *it reads *shutoff(unknown)* >From what I understand: The reason code for a particular state is maintained in-memory (no persistence in libvirt). Now when libvirtd restarts it queries the qemu monitor for all the running qemu processes and reassigns the state and reason. But for guests which are in shutoff state, there’s exists no QEMU instance for it, hence it has no way to know what was the last reason (i..e the default value 0 or UNKNOWN), but the state remains as shutfoff! Is there a patch for it? Or someway to retain the reason code across reboots and restart? Regards, Tanmoy Sinha

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[libvirt-users] rtc_timeoffset libvirt patch
by Volodymyr Matviiv 20 Mar '18

20 Mar '18

Hello, Could you please clarify if below patch is going to be released every with some stable version of libvirt. Do you have any info which version? https://www.redhat.com/archives/libvir-list/2018-February/msg00981.html Thank you in advance for your answer.

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[libvirt-users] Specify DNS and gateway for dnsmasq
by Gionatan Danti 17 Mar '18

17 Mar '18

Hi all, how I can set dhcp options as DNS, gateway, etc in libvirt's network definitions? From what I read here[1], I can use the <option> tag. However, I can not find nothing on libvirt official documentation. I am missing something? Thanks. [1] https://www.redhat.com/archives/libvir-list/2013-March/msg00166.html -- 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

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[libvirt-users] qemu-img snapshot on running virtual machine
by Gionatan Danti 16 Mar '18

16 Mar '18

Hi all, I have a question about internal qcow2 snapshots of a live/running virtual machine taken via "qemu-img snapshot command". My question is: is it safe to execute the command above against a running machine? Or it will cause corruption? Naively I think it should *not* be safe, however, I would like a direct confirmation. 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

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[libvirt-users] Resource control is not supported on this host
by Allence 15 Mar '18

15 Mar '18

Libvirt release version V4.1.0 It add a element is cachetune After we add this, We can use host-cpu-cache But when i add it, my host get a error message: "Resource control is not supported on this host" Why? Following is my environment: kernel : 4.1.5, libvirt : 4.1.0 qemu : 2.9 host : lfs-7.0 my add cachetune in xml: <cachetune vcpus='0-3'> <cache id='1' level='3' type='data' size='3' unit='MiB'/> </cachetune>

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[libvirt-users] Xen PVH Support in libvirt
by Tizian Lamatsch 14 Mar '18

14 Mar '18

Hello @ all, i wonder if there is any support for Xen PVH (https://wiki.xen.org/wiki/Xen_Project_Software_Overview) within libvirt. If i parse a xen native domU config file with 'virsh domxml-from-native' in which i set type='pvh' it changes it in the libvirt xml output to normal pv. Also the docs of libvirt do not state something like pvh. I am currently running Xen 4.10.0 with LibVirt 4.0.0. If it is not possible at the moment, can you please tell if this is a planned feature of libvirt? Thanks in advance for your help! Best Regards, Tizian

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