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[libvirt-users] About debugging of libvirt.
by cool dharma06 19 Dec '13

19 Dec '13

i am using libvirt-1.1.4 with xen(libxl). When destroying the VM its showing the following error : virsh # destroy 4 error: Failed to destroy domain 4 error: End of file while reading data: Input/output error error: One or more references were leaked after disconnect from the hypervisor error: Failed to reconnect to the hypervisor virsh # list error: failed to connect to the hypervisor error: no valid connection error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Connection refused already i send one request to this community to solve this problem. they suggested to do gdb. Any guide to do the gdb libvirtd. By googling i did the following things: 1. i enable the logoutput and loglevel in libvirtd.conf 2. restarted the libvirtd with the changed configuration file. 3. ps -aux | grep libvirtd 4. gdb libvirtd pid 5. then what i have to do to find the reason for this error. Suggest me some steps to solve this problem. regards, cooldharma06.

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[libvirt-users] fuse in libivrt-lxc
by Eldar Yusupov 19 Dec '13

19 Dec '13

Hi, I created an LXC domain via libvirt (on Fedora 20), but when I'm trying to mount a FUSE filesystem, like sshfs, I'm getting a following error: $ sshfs 172.30.15.2:/<mntdir> /<mntpoint> fuse: device not found, try 'modprobe fuse' first I see that there's no /dev/fuse device. Is there a way to make it work? Can I get it working via libvirt domain xml file settings or should I use something else, for example, edit cgroups settings directly somehow? Thanks in advance! -- -- Regards, Eldar Yusupov.

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[libvirt-users] QXL and VRAM settings in Virsh/Virt-Manager
by Alex GS 18 Dec '13

18 Dec '13

Hello list, Having a bit of an issue with virt-manager and virsh on Fedora 19/20. I've created several virtual guest machines, one of them is Windows. I've selected QXL and everything is working normally. The only part that's giving me trouble is that I'm unable to set the QXL VRAM higher than 64mb. This would be very useful for performance reasons. I've edited the XML for the corresponding machines and manually set the VRAM higher but when I start the machine with either virsh or virt-manager it defaults to 64mb again. Questions: 1. How can I set the QXL VRAM higher than the default 64mb? 2. Does the VRAM size even matter for guest video performance or does guest video share RAM from the total virtual RAM allocated? Thank you, AGS

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[libvirt-users] BZ1042505: Upon assigning addresses to new virtio-serial ports, libvirt can over-allocate
by Jonathan Lebon 17 Dec '13

17 Dec '13

Hello, (Not sure if this would be better suited for libvir-list, but here it goes!) I filed a bug last week regarding the way in which libvirt assigns addresses to virtio-serial ports. https://bugzilla.redhat.com/show_bug.cgi?id=1042505 To summarize, adding more than 31 ports causes problems because libvirt assigns them all to a single controller, which has a max of 31 (or less if the controller has a ports attribute). I was wondering, in general (eg. for things other than virtio-serial ports), are address assignments done by libvirt considered 'best efforts' (ie. we don't guarantee that it will work) or part of the 'promise' to the [API] user? (Ie. it should always result in a functioning virtual machine) I might be interested in working on a patch for this if it is considered worthwhile. Cheers, Jonathan

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[libvirt-users] How to Position a Network Interface in Physical PCI Slot
by Thiru Murugan 17 Dec '13

17 Dec '13

Hi , I would like to assign a Network Interface card to Physical Slot X in the virtual machine, I have gone through the XML file definition[Now i have some idea on how to position the Network Interface in Logical PCI Slot.] I am NOT interested in using a PCI Pass-through from the Host. currently running Fedora 19 with libvirt 1.2.0 I would like to create an network interface card on Physical Slot 5 so all my network interfaces under the pci-bridge get detected as pci5px Regards Thiru

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[libvirt-users] non trivial question
by Vasiliy Tolstov 16 Dec '13

16 Dec '13

Hi all. I have very special task - i have some vps on kvm, that sometimes needs external support help (administration). But i can't trust external workers and need to known what files are changed. As i understand best of all - create backup before work and after. After that check it for difference and decide apply this work or not. Vps need to run all time. (no downtime for work). How can i do that and what tools i need to use? Is that possible? Thanks for all answers. -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru jabber: vase(a)selfip.ru

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[libvirt-users] is qemu-kvm really searched for in /usr/bin for KVM?
by Robert P. J. Day 16 Dec '13

16 Dec '13

reading KVM/QEMU hypervisor driver page here: http://libvirt.org/drvqemu.html and one reads, "KVM hypervisor: The driver will probe /usr/bin for the presence of qemu-kvm ...". on my RHEL 6.5 system, qemu-kvm is in /usr/libexec, not /usr/bin. am i misreading something? rday

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[libvirt-users] First & long question
by Joaquim Barrera 16 Dec '13

16 Dec '13

Hello everybody! /(First I need to apologize becase I mussunderstood the prupose of libvirt-list and I sent this mail there instead of this list)/ I would like to introduce myself, as this is my first contact with libvirt mailing list (although I've been reading quite a lot of documentation). My name is Joaquim Barrera, from Barcelona, Catalonia. I am a computer engineer and recently I joined a research group here in the university. My task is related to VM migration and management, and since then (a couple of months) I've been trying to figure some things up. Now I need to go one step forward, and I would like to set up a nice dev environment to try some modifications we want to make to libvirt, such as new API or migration-related-stuff. Although I am familiar with linux environrment and programming, I am not really quite familiar with this kind of, may I say, professional development, and there are some issues I need to solve before start writting code. Some of this issues you'll find not relevant or newbie stuff, but I assure you I tried lots of times before coming here. :-) Here is what I got following the instructions in http://libvirt.org/compiling.html $ ./autogen.sh --system $ make After make finishes I have compiled 1.2.0 libvirt in the source tree, and if I execute 'sudo ./run tools/virsh version' I get a this answer: /Compiled against library: libvirt 1.2.0// //Using library: libvirt 1.2.0// //Using API: QEMU 1.2.0// //Running hypervisor: QEMU 1.5.0/ (/note that now I need to run virsh with sudo, I don't know exactly why/) So far, so good. I guess that, with --system flag, 1.2.0 custom libvirt uses config files from standard directories such as /etc/libvirt/libvirtd.conf, and if I used a custom directory instead, I would have to redefine my VMs, am I right? Problems come when I want to use custom 1.2.0 daemon. If I execute "sudo service libvirt-bin stop" followed by "./daemon/libvirtd -d", then custom virsh gives me this error: /error: failed to connect to the hypervisor// //error: no valid connection// //error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory/ And I need to kill custom daemon and restart 1.1.1 libvirtd to recover from this. Any advice? Finally (sorry about this large mail), there is one thing that does bother me quite a lot. Using custom virsh, command history seems to vanish, as I press Arrow-UP and I get "^[[A" in the screen, instead of last command used. Tell me, please, that this is just some silly config I need to adjust... :_( The final comment is, am I following the right direction to be able to develop something with libvirt? :_) Ok, that's all for now, thank you A LOT for your time. Joaquim.

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[libvirt-users] ANNOUNCE: ruby-libvirt 0.5.1
by Chris Lalancette 15 Dec '13

15 Dec '13

I'm pleased to announce the release of ruby-libvirt 0.5.1. ruby-libvirt is a ruby wrapper around the libvirt API. The changelog between 0.5.0 and 0.5.1 is: * Fixes to compile against older libvirt * Fixes to compile against ruby 1.8 Version 0.5.1 is available from http://libvirt.org/ruby: Tarball: http://libvirt.org/ruby/download/ruby-libvirt-0.5.1.tgz Gem: http://libvirt.org/ruby/download/ruby-libvirt-0.5.1.gem It is also available from rubygems.org; to get the latest version, run: $ gem install ruby-libvirt As usual, if you run into questions, problems, or bugs, please feel free to mail me (clalancette(a)gmail.com) and/or the libvirt mailing list. Thanks to everyone who contributed patches and submitted bugs.

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[libvirt-users] centos6 "system checkpoint"
by Ask Stack 14 Dec '13

14 Dec '13

Hello ### http://www.redhat.com/archives/libvir-list/2012-July/msg00782.htm "it almost sounds like you want the convenience of a system checkpoint (the ability to revert to a guest with its RAM state unchanged, which is much faster than booting from just disk state)." ### I am trying to figure out if it is possible to take a snapshot or "system checkpoint" for a VM running on a centos 6 host. I am able to take a snapshot but unable to revert. Force revert will cause the VM to become unresponsive. Nothing would show in console after revert. My host OS environment is CentOS release 6.4 (Final) libvirt-0.10.2-29 qemu-kvm-0.12.1.2-2.415 virsh # suspend combo01 Domain combo01 suspended virsh # snapshot-create-as --domain combo01 combo01-snap1 "snap1-desc" --atomic Domain snapshot combo01-snap1 created virsh # snapshot-list combo01 Name Creation Time State ------------------------------------------------------------ combo01-snap1 2013-12-14 20:57:41 +0000 paused virsh # snapshot-revert combo01 combo01-snap1 error: revert requires force: Target device address type none does not match source pci virsh # snapshot-revert combo01 combo01-snap1 --force virsh # list Id Name State ---------------------------------------------------- 8 combo01 paused virsh # resume combo01 Domain combo01 resumed virsh # console combo01 Connected to domain combo01 Escape character is ^] The VM became unresponsive at this point.

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