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[libvirt-users] Determine ongoing shutdown via libvirt or preventing migrations to host
by Ondřej Kunc 10 Dec '13

10 Dec '13

Hi list, Is there any function in libvirt to determine runlevel of host or any possibility to prevent VM migrations to that host ? I'm developing simple cluster of 4 servers running KVM VMs. For management I decided to use python-libvirt. It is working in that way, that every VM is diskless and booting via PXE so I can run it on every host server. Every VM has assigned one host as monitor which is responsible to periodically check, that VM is running on one of other hosts. If it don't run, it will be started on first available server assigned for that VM. When one of hosts is shut down, it will migrate all VMs to another hosts, but that monitor which checks VMs will migrate it after reboot. But I have race condition there that monitors can check that host is running before it is shutdown and will migrate VM's back to server which will reboot. Thank you for any help -- Ondřej Kunc, Senior Linux Administrator IGNUM s.r.o., Vinohradská 190, Praha 3, 130 61, CZE Mobil: +420 603 111 111 | Fax: +420 296 332 222 www.ignum.cz | www.domena.cz | www.webcloud.cz

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Re: [libvirt-users] gentoo linux, problem starting vm´s when cache=none
by Daniel P. Berrange 10 Dec '13

10 Dec '13

On Tue, Dec 10, 2013 at 03:21:59PM +0100, Marko Weber | ZBF wrote: > Hello Daniel, > > Am 2013-12-10 11:23, schrieb Daniel P. Berrange: > >On Tue, Dec 10, 2013 at 11:20:35AM +0100, Marko Weber | ZBF wrote: > >> > >>hello mailinglist, > >> > >>on gentoo system with qemu-1.6.1, libvirt 1.1.4, libvirt-glib-0.1.7, > >>virt-manager 0.10.0-r1 > >> > >>when i set on virtual machine "cache=none" in the disk-menu, the > >>machine faults to start with: > >> > >><< > >>Fehler beim Starten der Domain: Interner Fehler: Prozess während der > >>Verbindungsaufnahme zum Monitor beendet :qemu-system-x86_64: > >>-drive file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: > >>could not open disk image /raid6/virtual/debian-kaspersky.img: > >>Invalid argument > >> > >> > >>Traceback (most recent call last): > >> File "/usr/share/virt-manager/virtManager/asyncjob.py", line 100, > >>in cb_wrapper > >> callback(asyncjob, *args, **kwargs) > >> File "/usr/share/virt-manager/virtManager/asyncjob.py", line 122, > >>in tmpcb > >> callback(*args, **kwargs) > >> File "/usr/share/virt-manager/virtManager/domain.py", line 1210, > >>in startup > >> self._backend.create() > >> File "/usr/lib64/python2.7/site-packages/libvirt.py", line 708, in > >>create > >> if ret == -1: raise libvirtError ('virDomainCreate() failed', > >>dom=self) > >>libvirtError: Interner Fehler: Prozess während der > >>Verbindungsaufnahme zum Monitor beendet :qemu-system-x86_64: > >>-drive file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: > >>could not open disk image /raid6/virtual/debian-kaspersky.img: > >>Invalid argument > >>>> > >> > >>when i switch back to cache=default, the machine start like a charm. > >> > >>any ideas why? i cant find anything in logs, only this "invalid > >>argument". > > > >cache=none uses O_DIRECT flag. if you get "Invalid argument" it usually > >means that your filesystem is bad and does not support O_DIRECT > > i use vanilla-kernel 3.10.23 and xfs on the partition where the vm > .img is lying. > > the mount options i use: /raid6 type xfs > (rw,noatime,nodiratime,largeio,nobarrier,logbsize=256k) > > any wrong here? XFS should support O_DIRECT, but possibly one of the mount option is causing trouble. I don't know enough about XFS to answer for sure. BTW, please keep your replies on the mailing list... Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|

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[libvirt-users] gentoo linux, problem starting vm´s when cache=none
by Marko Weber | ZBF 10 Dec '13

10 Dec '13

hello mailinglist, on gentoo system with qemu-1.6.1, libvirt 1.1.4, libvirt-glib-0.1.7, virt-manager 0.10.0-r1 when i set on virtual machine "cache=none" in the disk-menu, the machine faults to start with: << Fehler beim Starten der Domain: Interner Fehler: Prozess während der Verbindungsaufnahme zum Monitor beendet :qemu-system-x86_64: -drive file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: could not open disk image /raid6/virtual/debian-kaspersky.img: Invalid argument Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 100, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 122, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/domain.py", line 1210, in startup self._backend.create() File "/usr/lib64/python2.7/site-packages/libvirt.py", line 708, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: Interner Fehler: Prozess während der Verbindungsaufnahme zum Monitor beendet :qemu-system-x86_64: -drive file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: could not open disk image /raid6/virtual/debian-kaspersky.img: Invalid argument >> when i switch back to cache=default, the machine start like a charm. any ideas why? i cant find anything in logs, only this "invalid argument". the machine is created with profile "linux / debian squeeze" cause its a debian 6 marko

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[libvirt-users] ANNOUNCE: ruby-libvirt 0.5.0
by Chris Lalancette 10 Dec '13

10 Dec '13

All, I'm pleased to announce the release of ruby-libvirt 0.5.0. ruby-libvirt is a ruby wrapper around the libvirt API. Version 0.5.0 brings new APIs, more documentation, and bugfixes: * Updated Network class, implementing almost all libvirt APIs * Updated Domain class, implementing almost all libvirt APIs * Updated Connection class, implementing almost all libvirt APIs * Updated DomainSnapshot class, implementing almost all libvirt APIs * Updated NodeDevice class, implementing almost all libvirt APIs * Updated Storage class, implementing almost all libvirt APIs * Add constants for almost all libvirt defines * Improved performance in the library by using alloca Version 0.5.0 is available from http://libvirt.org/ruby: Tarball: http://libvirt.org/ruby/download/ruby-libvirt-0.5.0.tgz Gem: http://libvirt.org/ruby/download/ruby-libvirt-0.5.0.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. Chris Lalancette

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[libvirt-users] Question about setns recognising in libvirt autoconf
by hzguanqiang＠corp.netease.com 09 Dec '13

09 Dec '13

Hi experts, When I test lxc container with lxc-enter-namespace command, It reported an error as following: root@debian:~/github/libvirt# vir lxc-enter-namespace lxc --noseclabel /bin/df -hl error: Cannot get namespaces for 3145: Function not implemented It seems that setns is not supported by my kernel. But from the following info, It seemed the reason is just libvirt/autoconf doesn't recgonise setns. root@debian:~/github/libvirt# grep setns /proc/kallsyms ffffffff8105b78b T SyS_setns ffffffff8105b78b T sys_setns root@debian:~/github/libvirt# ./configure | grep setns checking for setns... no What the problem really is ? How can I fix this problem? Thanks~ ------------------ Best regards! GuanQiang 2013-12-09

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[libvirt-users] Libvirt support for KVM/ARM
by 林佳緯 09 Dec '13

09 Dec '13

Sorry for ask the similar question again. ( I have asked "libvirt support for arm platform" but truely I want to ask libvirt for kvm/arm.) My question: Does libvirt API support KVM/ARM now? Thanks for any answer. Gavin

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[libvirt-users] assign static external IP to container
by scar 08 Dec '13

08 Dec '13

hello i have a server colocated in a datacenter with several external IP addresses available to use. the physical server is using one of these IPs, and i want to assign another, unused IP to the virtual machine. i thought i could just do this by editing the container's /etc/network/interfaces, setting a static IP address for eth0 much like i did for br0 on the host machine.... but doesn't seem to be working. ifconfig shows eth0 has the external address but i can't resolve any hostnames nor telnet to a direct IP address (no route to host). if i change back to dhcp and let eth0 get an internal address, i can at least access the internet but cannot access the virtual machine from the internet. what is the trick to giving a VM a routable, external IP address? thanks

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[libvirt-users] correct way to hot-add cdrom ?
by Alexandr 05 Dec '13

05 Dec '13

Good day to all. i have problems with cdrom hot adding code. currently i using virDomainAttachDevice with type=file, device=cdrom, dev=hdc, this code works for machine with one ide hdd and one ide cdrom, but this not work for machine with only one ide hdd, and i looking for solution to hot add cdrom to machine independent of existing devices or i need way to determinate which target device can be attached to vm. thanks in advance for any help.

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[libvirt-users] how to add/remove emulated usb removable devices to guests
by Alexandr 05 Dec '13

05 Dec '13

Good day, i was not able to find api to add/remove usb removable devices to guest, i have windows machines and need to plug usb stick with some fs (fat or ntfs) which is image on host, i was found what it is possible and implemented in libvirt https://bugzilla.redhat.com/show_bug.cgi?id=922495, but i can't find how to use this.

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[libvirt-users] libvirt, Open vSwitch and iptables
by Yoann Juet 05 Dec '13

05 Dec '13

Hi all, We're using since a long time libvirt with KVM guest machines and linux bridges. Firewall rules based on iptables and defined on the host server control inbound/outbound traffic to/from each VM. In order to improve remote administration facility and get extra services, it makes sense for us to replace linux bridges with Open vSwitch. However, the side effect is the solution's inability to filter VM traffic since it's impossible to set-up iptables rules with ovs bridges. OpenStack/Quantum circumvents this problem (no talking about performance) by setting an extra linux bridge and veth pair between the guest TAP and ovs. Is there {a simple|an alternative} solution to achieve it without installing the OpenStack/Quantum layer ? Thanks, Regards, -- Université de Nantes - Direction des Systèmes d'Information IM jabber: yoann.juet(a)univ-nantes.fr

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