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[libvirt-users] spice session locking
by Jon Doe 16 Feb '15

16 Feb '15

Hi List, Is it possible to prevent other clients from stealing my libvirtd hosted spice session? This is a problem for me where multiple co-workers access the same guest over a qemu+ssh:// connection. Instead of simply disconnecting clients, I'd like libvirtd to deny the new client. I've been looking at polkit acl rules and the vnc sharePolicy attribute but so far no luck.

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[libvirt-users] libvirt live migration, qcow2 image, nbd server
by Edward Young 15 Feb '15

15 Feb '15

Hi all, When I live migrate a vm using "migrate --live --copy-storage-all mig-vm qemu+ssh://192.168.1.3/system tcp://192.168.1.3" I got the following error WARNING: Image format was not specified for 'nbd://node2:49155/drive-virtio-disk0' and probing guessed raw. 258 Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted. 259 Specify the 'raw' format explicitly to remove the restrictions. >From the error itself, I can tell that nbd server treat this image as raw, rather than qcow2. My platform is libvirt+qemu. the image type of this vm is indeed qcow2. I do not know how to let nbd know this image format. Thanks! Ed

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[libvirt-users] way to see the bootmenu via serial?
by mail list 13 Feb '15

13 Feb '15

Maybe this should go to the qemu mail list, but I have domains configured to dump to serial. Works fine I see Grub menu/kernel messages and the like, but the "bootmenu" listing only shows up over vnc. Is there a way to have that show up over serial? I definitely can hit up the qemu mail list as well if inappropriate for here

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[libvirt-users] spice session locking
by Jon Doe 13 Feb '15

13 Feb '15

Hi List, Is it possible to prevent other clients from stealing my libvirtd hosted spice session? This is a problem for me where multiple co-workers access the same guest over a qemu+ssh:// connection. Instead of simply disconnecting clients, I'd like libvirtd to deny the new client. I've been looking at polkit acl rules and the vnc sharePolicy attribute but so far no luck.

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[libvirt-users] QEMU 2.2.0 managedsave: Unknown savevm section type 5
by Paul Apostolescu 13 Feb '15

13 Feb '15

Hello, I am running into issues restoring VMs during reboot for some of my XP VMs - the environment is QEMU 2.2.0, libvirt 1.2.12 on CentOS 6.5 with KVM and libvirt-guests is set to suspend at shutdown. The weird part is Windows 7 is restored properly from the managedsave however XP does not, doing a start from virsh shows this: virsh # start xp-check error: Failed to start domain xp-check error: internal error: early end of file from monitor: possible problem: Unknown savevm section type 5 2015-02-04T23:55:37.117515Z qemu-kvm: load of migration failed: Invalid argument (qemu-kvm is a link to qemu-system-x86_64). Any ideas how to fix this ? Thanks

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[libvirt-users] vm live storage migration with snapshots
by Edward Young 13 Feb '15

13 Feb '15

Hi all, I'm investigating the ways to improve the live migration performance in libvirt. I have a question about the vm live storage migration. the platform is libvirt + qemu + kvm If we want to migrate a running vm with its virtual disk images to another node. we can use 'virsh migrate ....' commands. What if this vm has a number of disk-only external snapshots? In the current version, how can live migrate this vm? Is it possible to blockcommit the snapshots to the base image and later perform the migration, without shutting down the running vm? Or is it possible to iteratively transfer all the snapshots to the destination and later live migrate only the latest new data? Thanks in advance. Best, Ed

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[libvirt-users] libvirt/virsh change boot order
by Robb Walker 11 Feb '15

11 Feb '15

Hello, hope all are well. Am I missing something? If I add a cdrom and change boot order in a running vm with virsh edit, I have to shutdown the vm and restart to see the change in boot order. I can not just restart the vm via reboot inside the vm or virsh reboot vm. I don't see anything under /var/lib/libvirt/qemu/saved where I might expect conflict if I was battling against a saved configuration. If obvious, DUH, apologies and virtually bonk me on the head. Note: This is actually okay. Just don't want to miss on something that would allow me to just cycle the vm after make changes. on ubu -- 14.04 ii libvirt-bin 1.2.2-0ubuntu13.1.9 amd64 programs for the libvirt library ii libvirt-dev 1.2.2-0ubuntu13.1.9 amd64 development files for the libvirt library ii libvirt-doc 1.2.2-0ubuntu13.1.9 all documentation for the libvirt library ii libvirt0 1.2.2-0ubuntu13.1.9 amd64 library for interfacing with different virtualization systems <os> <type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type> <boot dev='cdrom'/> <boot dev='hd'/> </os> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/home/foo/Downloads/archlinux-2015.02.01-dual.iso'/> <target dev='hdc' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> Thanks and Kind Regards all This e-mail and any attachments may contain information that is confidential and proprietary and otherwise protected from disclosure. If you are not the intended recipient of this e-mail, do not read, duplicate or redistribute it by any means. Please immediately delete it and any attachments and notify the sender that you have received it in error. Unintended recipients are prohibited from taking action on the basis of information in this e-mail or any attachments. The DRW Companies make no representations that this e-mail or any attachments are free of computer viruses or other defects.

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Re: [libvirt-users] libvirt 1.2.10 and latest EL6 qemu-kvm
by Franky Van Liedekerke 11 Feb '15

11 Feb '15

(I'm sorry, I didn't find my original message but I provide the archive link: https://www.redhat.com/archives/libvirt-users/2015-January/msg00069.html ) I just tried the latest libvirt release (1.2.12), combined with the following qemu EL6 package from centos: qemu-kvm-0.12.1.2-2.448.el6_6.x86_64 Using 1.2.12 and this version of qemu-kvm, I still get the following error when trying to start a domain: error: Failed to start domain btcab0001ap.unix.banksys.be error: internal error: unable to execute QEMU command 'qom-list': The command qom-list has not been found The older qemu package (qemu-kvm-0.12.1.2-2.415.el6_5.14.x86_64) works just fine though (I also tried the qemu-rhev-packages for el6 from ovirt, but no change). I verified the changelog from libvirt 1.2.12 and the earlier suggested fix is in there (but doesn't seem to change anything): 2015-01-14 Pavel Hrdina <phrdina(a)redhat.com> qemu_monitor: introduce new function to get QOM path Now, I have activated libvirtd debug and these are the qom-list lines (I can provide the full logfile if wanted): 2015-02-11 14:10:33.259+0000: 13280: debug : virJSONValueToString:1528 : result={"execute":"qom-list","arguments":{"path":"/machine/unattached/device[0]"},"id":"libvirt-5"} 2015-02-11 14:10:33.259+0000: 13280: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"qom-list","arguments":{"path":"/machine/unattached/device[0]"},"id":"libvirt-5"}' for write with FD -1 2015-02-11 14:10:33.259+0000: 13280: info : qemuMonitorSend:972 : QEMU_MONITOR_SEND_MSG: mon=0x7fa62801cbf0 msg={"execute":"qom-list","arguments":{"path":"/machine/unattached/device[0]"},"id":"libvirt-5"} 2015-02-11 14:10:33.260+0000: 13278: info : qemuMonitorIOWrite:503 : QEMU_MONITOR_IO_WRITE: mon=0x7fa62801cbf0 buf={"execute":"qom-list","arguments":{"path":"/machine/unattached/device[0]"},"id":"libvirt-5"} 2015-02-11 14:10:33.261+0000: 13278: info : qemuMonitorIOProcess:399 : QEMU_MONITOR_IO_PROCESS: mon=0x7fa62801cbf0 buf={"id": "libvirt-5", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}} 2015-02-11 14:10:33.261+0000: 13278: debug : qemuMonitorJSONIOProcessLine:183 : Line [{"id": "libvirt-5", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}}] 2015-02-11 14:10:33.261+0000: 13278: debug : virJSONValueFromString:1361 : string={"id": "libvirt-5", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}} 2015-02-11 14:10:33.261+0000: 13278: info : qemuMonitorJSONIOProcessLine:203 : QEMU_MONITOR_RECV_REPLY: mon=0x7fa62801cbf0 reply={"id": "libvirt-5", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}} 2015-02-11 14:10:33.289+0000: 13280: debug : virJSONValueToString:1528 : result={"execute":"qom-list","arguments":{"path":"/machine/peripheral"},"id":"libvirt-7"} 2015-02-11 14:10:33.289+0000: 13280: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"qom-list","arguments":{"path":"/machine/peripheral"},"id":"libvirt-7"}' for write with FD -1 2015-02-11 14:10:33.289+0000: 13280: info : qemuMonitorSend:972 : QEMU_MONITOR_SEND_MSG: mon=0x7fa62801cbf0 msg={"execute":"qom-list","arguments":{"path":"/machine/peripheral"},"id":"libvirt-7"} 2015-02-11 14:10:33.289+0000: 13278: info : qemuMonitorIOWrite:503 : QEMU_MONITOR_IO_WRITE: mon=0x7fa62801cbf0 buf={"execute":"qom-list","arguments":{"path":"/machine/peripheral"},"id":"libvirt-7"} 2015-02-11 14:10:33.291+0000: 13278: info : qemuMonitorIOProcess:399 : QEMU_MONITOR_IO_PROCESS: mon=0x7fa62801cbf0 buf={"id": "libvirt-7", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}} 2015-02-11 14:10:33.291+0000: 13278: debug : qemuMonitorJSONIOProcessLine:183 : Line [{"id": "libvirt-7", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}}] 2015-02-11 14:10:33.291+0000: 13278: debug : virJSONValueFromString:1361 : string={"id": "libvirt-7", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}} 2015-02-11 14:10:33.291+0000: 13278: info : qemuMonitorJSONIOProcessLine:203 : QEMU_MONITOR_RECV_REPLY: mon=0x7fa62801cbf0 reply={"id": "libvirt-7", "error": {"class": "CommandNotFound", "desc": "The command qom-list has not been found", "data": {"name": "qom-list"}}} 2015-02-11 14:10:33.291+0000: 13280: debug : virJSONValueToString:1528 : result={"execute":"qom-list","arguments":{"path":"/machine/peripheral"},"id":"libvirt-7"} 2015-02-11 14:10:33.292+0000: 13280: debug : virJSONValueToString:1528 : result={"id":"libvirt-7","error":{"class":"CommandNotFound","desc":"The command qom-list has not been found","data":{"name":"qom-list"}}} 2015-02-11 14:10:33.292+0000: 13280: debug : qemuMonitorJSONCheckError:370 : unable to execute QEMU command {"execute":"qom-list","arguments":{"path":"/machine/peripheral"},"id":"libvirt-7"}: {"id":"libvirt-7","error":{"class":"CommandNotFound","desc":"The command qom-list has not been found","data":{"name":"qom-list"}}} 2015-02-11 14:10:33.292+0000: 13280: error : qemuMonitorJSONCheckError:381 : internal error: unable to execute QEMU command 'qom-list': The command qom-list has not been found (again: full log can be provided, but maybe that should be sent in private, I don't know if it is allowed as an attachment here). Any tips? Franky

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Re: [libvirt-users] About live migration with snapshots
by Edward Young 11 Feb '15

11 Feb '15

Hi All, Sorry, I do not know to reply the previous message directly, so I have to manually copy them here. I have two questions about the following issue? 1. I follow the instructions blew to migrate a vm with snapshots. When I perform 'virsh snapshot-create --redefine $dom file' on the destination.' I got an error saying that "no domain with matching name $dom". I'm wondering during the mgiration, what do we need to do in the destination? create a new base file? 2. What does the following instruction do? "you then loop over 'virsh snapshot-delete --metadata $dom $name' on the source, at which point, live migration will now work." 3. Also, could you explain a little about the high level techniques for this function. suppose we have a vm with one base file and two snapshots. How does the following instructions do to migrate all of them? Thanks! Edward ------------------------------ - *From*: Eric Blake <eblake redhat com> - *To*: Chiang Hubert <clhtwn gmail com> - *Cc*: libvirt-users redhat com - *Subject*: Re: [libvirt-users] About live migration with snapshots - *Date*: Wed, 20 Mar 2013 21:40:26 -0600 ------------------------------ On 03/20/2013 08:45 PM, Chiang Hubert wrote: > Hello, > > I'd like to live migration with snapshots. > > But it doesn't work. It comes out a message "cannot migrate domain with 1 > snapshots" Unfortunately, figuring out how to migrate snapshot information at the libvirt API level requires some engineering work - the current RPC protocol for migration is not set up to migrate an arbitrary amount of snapshots in a single call. On the other hand, if you are allowed to make more than one API call, the solution is already available; maybe we should patch virsh to learn how to make the series of API calls, to automate what I will describe below. > > Then I try to trace the code(Libvirt 0.9.8 to 1.0.3), I find out the code > in src/qemu/qemu_migration.c @ Line 1395 - 1440 (Libvirt 1.0.3) It's still unimplemented at the libvirt level, even in libvirt.git. > > It will check the VM which has snapshots or not. > > I just curious about this limitation, why the VM can't live migration with > snapshots? Doing it all in one RPC call would be a potential denial-of-service (RPCs are bounded in length to avoid consuming server resources, and taking lots of snapshots on the source could easily be made to exceed bounds). If someone can design a way to set up a series of RPC handshakes, then we could do it at the libvirt level in a single API call, but I'm not sure it is worth it. > > What happen if I skip this check? > > Does it has any suggestion way or virsh command with options to do live > migration with snapshots? The existing solution at the management tool layer is to migrate the snapshot information first, and then to migrate the domain. For each snapshot in 'virsh snapshot-list --name $dom', you will want to 'virsh snapshot-dumpxml $dom $name > file' on the source, then 'virsh snapshot-create --redefine $dom file' on the destination. Next, determine 'virsh snapshot-current --name $dom' on the source, and use 'virsh snapshot-current $dom $name' on the destination to set it as current (if there is a current snapshot). After the destination has all the snapshots, you then loop over 'virsh snapshot-delete --metadata $dom $name' on the source, at which point, live migration will now work. Patches to teach virsh how to do all this work in a single 'virsh migrate' are welcome. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org *Attachment: signature.asc <https://www.redhat.com/archives/libvirt-users/2013-March/pgpmxFegVXm2O.pgp>* *Description:* OpenPGP digital signature

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[libvirt-users] Possible to change 'machine type' attribute while vm is running?
by Andre Goree 09 Feb '15

09 Feb '15

Hello. I'd like to determine if it's possible to change the 'machine type' attribute while a vm is running. For example, I have: <os> <type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type> <boot dev='hd'/> </os> I'd like to change that to "machine='pc-i440fx-1.7'" due to an error[1] I'm seeing while migrated similar images to another host. The only way I've been able to change the machine is by first shutting down the vm, making the change, then starting the vm back up. I'd like to avoid that if at all possible. I did find the tool "libvirt-migrate-qemu-machinetype", but it doesn't seem to do what I think it's intended to do -- i.e., it does NOT change the machine type, even after reboot. Perhaps I'm just using it wrong? I performed the following: root:~# libvirt-migrate-qemu-machinetype -t pc-i440fx-1.7 <domain> Waiting up to 10 seconds for libvirtd to start... Waiting up to 30 seconds for libvirtd to respond to requests... Checking domains defined in /etc/libvirt/qemu... Migration complete But the machine type remains the same after the above command has been run. Thanks in advance for any insight you can provide. [1] - error: internal error: process exited while connecting to monitor: Supported machines are: -- Andre Goree -=-=-=-=-=- Email - andre at drenet.net Website - http://www.drenet.net PGP key - http://www.drenet.net/pubkey.txt -=-=-=-=-=-

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