April 2014 - Users - libvirt List Archives

[libvirt-users] some problem with snapshot by libvirt
by xingxing gao 21 Nov '14

21 Nov '14

Hi,all,i am using libvirt to manage my vm,in these days i am testing the libvirt snapshot ,but meet some problem: the snapshot was created from this command: snapshot-create-as win7 --disk-only --diskspec vda,snapshot=external --diskspec hda,snapshot=no but when i tried to revert from the snapshot which created from the above command ,i got error below: virsh # snapshot-revert win7 1338041515 --force error: unsupported configuration: revert to external disk snapshot not supported yet version: virsh # version Compiled against library: libvir 0.9.4 Using library: libvir 0.9.4 Using API: QEMU 0.9.4 Running hypervisor: QEMU 1.0.93

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[libvirt-users] virsh update-device: need to clear network filters
by Oleg Bondarev 01 May '14

01 May '14

Hi, Can anyone please help with the following: I have a running instance with interface <interface type='bridge'> <mac address='fa:16:3e:ba:a4:67'/> <source bridge='br100/> <target dev='vnet0'/> <model type='virtio'/> <filterref filter='nova-instance-instance-00000001-fa163ebaa467'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> what I need is to clear network interface on the instance. I tried virsh update-device with following xml: <interface type='bridge'> <mac address='fa:16:3e:ba:a4:67'/> <source bridge='br100/> <model type='virtio'/> </interface> but this results in the following error: $ sudo virsh update-device 13 xml.xml --persistent --live --config error: Failed to update device from xml.xml error: End of file while reading data: Input/output error error: Failed to reconnect to the hypervisor and libvirt is restarted. Is it possible to clear nw filter at all? Thanks, Oleg

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[libvirt-users] About virsh console on Windows guest
by Yoann Dandine 30 Apr '14

30 Apr '14

Hello, Then everything is in the title, i would like to get the guest's serial console, the Windows one, Linux works perfectly at the moment. I don't find enough informations about that, so I'm asking myself : "Is that stupid or inconsistent ?". I know we can go trough 2 ssh access it but that's not really nice to do. My searches resulted in the use of EMS, I'm still trying this way but it seems it doesn't work. Any suggestions ? Kind regards Yoann Dandine.

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[libvirt-users] [LXC] Libvirtd without root
by Jan Olszak 30 Apr '14

30 Apr '14

Hi there! Can libvirtd (lxc driver) run as a non-root user, but with the right CAPs? Thanks, Jan

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[libvirt-users] How can I have more than one console/terminal windows when connecting to lxc
by WANG Cheng D 30 Apr '14

30 Apr '14

Dear all, I use virsh command to start a container and connect to it. When I use virsh -c lxc:/// console mycontainer, I only have one console. I wonder how to open multiple terminal windows for the same container. Thank you in advance Cheng Wang

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Re: [libvirt-users] libvirt-users Digest, Vol 52, Issue 39
by Taimur Al Said 28 Apr '14

28 Apr '14

On Sun, Apr 27, 2014 at 5:00 PM, <libvirt-users-request(a)redhat.com> wrote: > Send libvirt-users mailing list submissions to > libvirt-users(a)redhat.com > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.redhat.com/mailman/listinfo/libvirt-users > or, via email, send a message with subject or body 'help' to > libvirt-users-request(a)redhat.com > > You can reach the person managing the list at > libvirt-users-owner(a)redhat.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of libvirt-users digest..." > > > Today's Topics: > > 1. Ability of a VM to detect Libvirt events. (Taimur Al Said) > 2. Re: Ability of a VM to detect Libvirt events. (Brian Rak) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 26 Apr 2014 22:46:30 +0100 > From: Taimur Al Said <alsaidts(a)gmail.com> > To: libvirt-users(a)redhat.com > Subject: [libvirt-users] Ability of a VM to detect Libvirt events. > Message-ID: > <CACwu6qRADOyJ6EB_OD= > YZgbogNqQLQPxOJfRXshGcqosgDmPKg(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi there, > > Let's assume a libvirt event occurred on a VM, i.e an event like pause VM > or reboot VM or any other libvirt event. Can the VM determine that such > event was originated by libvirt? ---or in a more general term by the > hypervisor? If yes, how can this be done in theory? > > Thanks in advance, > > Regards, > Taimur > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://www.redhat.com/archives/libvirt-users/attachments/20140426/4699d43e… > > > > ------------------------------ > > Message: 2 > Date: Sat, 26 Apr 2014 18:46:42 -0400 > From: Brian Rak <brak(a)gameservers.com> > To: libvirt-users(a)redhat.com > Subject: Re: [libvirt-users] Ability of a VM to detect Libvirt events. > Message-ID: <535C3752.5070609(a)gameservers.com> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" > > How are you thinking that a VM would be paused/rebooted via something > other then the hypervisor? > > On 4/26/2014 5:46 PM, Taimur Al Said wrote: > > Hi there, > > > > Let's assume a libvirt event occurred on a VM, i.e an event like pause > > VM or reboot VM or any other libvirt event. Can the VM determine that > > such event was originated by libvirt? ---or in a more general term by > > the hypervisor? If yes, how can this be done in theory? > > > > Thanks in advance, > > > > Regards, > > Taimur > > > > > > _______________________________________________ > > libvirt-users mailing list > > libvirt-users(a)redhat.com > > https://www.redhat.com/mailman/listinfo/libvirt-users > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://www.redhat.com/archives/libvirt-users/attachments/20140426/d18e0d87… > > > > ------------------------------ > > _______________________________________________ > libvirt-users mailing list > libvirt-users(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users > > End of libvirt-users Digest, Vol 52, Issue 39 > ********************************************* > Thanks, I guess my query was clear. However, I'll make it clearer. I know that the such events are caused by the hypervisor. Either directly or using tools such as Libvirt. The question is: can such events be detectable from the VM level? In another word, can the VM tell if it was being paused/rebooted/migrated/etc? Best regards, Taimur

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[libvirt-users] Fwd: [s3-bug-review] [RHEL7] [Virtual disks] Met error messages while the guest OS booting up on a nbd device.
by Chenli Hu 28 Apr '14

28 Apr '14

Hi, all We met an issue while doing the nbd related test, will you please help to review if this issue is a bug? Thank you! ================================================= Subject: [s3-bug-review] [RHEL7] [Virtual disks] Met error messages while the guest OS booting up on a nbd device. Description: Start a guest with only one nbd device and with a linux OS installed on the nbd device, "virsh create" return successfully, but meet error messages while the guest OS booting up. Version: libvirt-client-1.1.1-29.el7.x86_64 qemu-kvm-1.5.3-60.el7.x86_64 kernel-3.10.0-121.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. start nbd server on the server host. #nbd-server 10809 /var/lib/libvirt/images/r7g-qcow2.img 2. create a domain with xml as bellow. # virsh create r7g-nbd.xml Domain r7g-qcow2 created from r7g-nbd.xml # virsh dumpxml r7g-qcow2| grep disk -A 7 <disk type='network' device='disk'> <driver name='qemu' type='qcow2'/> <source protocol='nbd'> <host name='10.66.106.34' port='10809'/> </source> <target dev='sda' bus='scsi'/> <alias name='scsi0-0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> # ps -ef| grep qemu-kvm| grep nbd qemu 15724 1 99 09:58 ? 00:00:47 /usr/libexec/qemu-kvm -name r7g-qcow2 ...... -drive file=nbd:10.66.106.34:10809,if=none,id=drive-scsi0-0-0-0,format=qcow2 -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1 ...... 3. login to the guest, the console output error messages and fail to booting up. Actual results： As described. Expected results: The guest can boot up successfully. Additional info: Attached screen-shot and log files. Regards, chhu

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[libvirt-users] Forwarding incoming connections from an secondary external interface with dhcp
by Bhima Pandava 28 Apr '14

28 Apr '14

Hi everyone, I have a server (ubuntu 14.04 lts) running KVM with a few guests (each with static IP addresses) which I manage using libvirt. This machine has a wired interface (br0 / p2p1) connecting to my internal network and a wireless interface using dhcp (ppp0) as a secondary direct connection to the internet. My goal is route all administration traffic for both the host and guests through the wired interface (br0); while routing the service traffic, and _only_ this traffic, through the ppp0 interface. For example: One vm is a webserver and I wish to route all traffic on ports 80 & 443 from ppp0 to that vm. Another vm is a mailserver and I wish to route all the imap & pop traffic from ppp0 to that vm. At the same time, I wish to be able to ssh in through the wired interface (p2p1) and route all system maintenance traffic through the wired interface as well. Additionally I wish to drop/reject incoming traffic on ppp0 which is not on these specified ports. Reading the libvirt documentation, I have found a section which very nearly describes my needs: http://wiki.libvirt.org/page/Networking#Forwarding_Incoming_Connections Unfortunately, I am unsure how to correcting modify the given examples to meet my specific needs. To begin with, the examples assume a static external IP, while mine is dynamic. I think I would like to refer to interface by name (ppp0) or perhaps create a secondary bridge (br1) with a static IP, the ppp0 included with "bridge_prts ppp0" command, and then refer to the static IP of the new bridge (br1). Next, I don't see the correct mechanism which I could configure such that all traffic coming in ppp0 which was not on the specified ports is rejected/dropped and all administrative traffic, originating from both the host and guests, is routed through the wired interface. I am assuming that this also should be done through libvirt/virsh and not directly through iptables. If it matters, the wired interface connects to a router running shorewall (and thus the server is in the "dmz" zone). The server itself is not running shorewall or any other similar things. The router is managing the primary connection to internet, which is distinct from the secondary wireless interface on the server, it is connecting to a different ISP. If anyone could give me some advice or point me to some additional or more relevant documentation/examples I would really, really appreciate it. Thanks!

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[libvirt-users] Ability of a VM to detect Libvirt events.
by Taimur Al Said 26 Apr '14

26 Apr '14

Hi there, Let's assume a libvirt event occurred on a VM, i.e an event like pause VM or reboot VM or any other libvirt event. Can the VM determine that such event was originated by libvirt? ---or in a more general term by the hypervisor? If yes, how can this be done in theory? Thanks in advance, Regards, Taimur

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[libvirt-users] Deriving VMs from a reference image via scripts
by Philip Prindeville 25 Apr '14

25 Apr '14

Hi. I have a reference .vmdk (and .xml) reference VM. I need to instantiate multiple new VM’s from this, but changing various parameters: name, MAC address, network connections, cores, memory size, disk size and backing store, etc. and then start these new VM’s… all via ‘virsh’ et al from a script. What are the steps to do this? I was looking at the command help and some tutorials but apparently not the right ones. Thanks, -Philip

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