- Users - libvirt List Archives

[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

2 2

[libvirt-users] 回复： Fwd: About libvirt domain snapshot problem(for single disk snapshot)
by James Iter 22 Mar '18

22 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 > > > > > > > > > > > > > > > > >

1 0

[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

2 1

Re: [libvirt-users] Persisting the libvirt guest's reason code.
by Daniel P. Berrangé 20 Mar '18

20 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 :|

1 0

[libvirt-users] About libvirt domain snapshot problem(for single disk snapshot)
by James Iter 20 Mar '18

20 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

1 1

[libvirt-users] Persisting the libvirt guest's reason code.
by Tanmoy Sinha 20 Mar '18

20 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

2 1

[libvirt-users] rtc_timeoffset libvirt patch
by Volodymyr Matviiv 19 Mar '18

19 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.

2 1

[libvirt-users] Specify DNS and gateway for dnsmasq
by Gionatan Danti 16 Mar '18

16 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

4 6

[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

3 4

[libvirt-users] Resource control is not supported on this host
by Allence 14 Mar '18

14 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>

4 4