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[libvirt-users] libvirt and shared storage SAN Fiber Channel
by Frederic SOULIER 24 Jan '11

24 Jan '11

Hi, I'm looking information about using libvirt with san (fiber channel) based storage and googling for a while i don't see anything about it. I send this email in order to get advices about libvirt and shared storage We use here, for 3 years now, 8 linux centos server connected to an hitachi FC SAN (multipath devices). Each server run Xen dom0 and use SAN LUNs to store Virtual machine filesystem ( basically one LUN per VM). For each LUN we create an LVM VolGroup. On each VolGroup we create Logical volumes (one for swap, one for root filesystem). We present to the vm the 2 Logical Volume as it was raw disk. In this system we can make live migration between host using local scripts which assume than one VolumeGroup is used only by one host at the same time on the 8 node "cluster". We don't use any clustered aware environment like CLVM. We plan to migrate to kvm and libvirt with the new centos release (CentOS 6). Reading the upstream documentation and libvirt i don't find anything about using libvirt with san storage except for iscsi. Do you have any link or idea about using kvm + libvirt + SAN FC storage that permit to make live migration between node (we think about RHCS with GFS2 but it seems very complex to set up) ? Do you think i can use the LUN's SAN as local storage on each node. For each LUN create an LVM Volume Group (same on each node, like that we doing now with xen) and use it as volume pool in libvirt. Is volume pool in libvirt is 'cluster aware' (Can i access it simultaneously from different node) ? I'm beginner in kvm so any advice will be great. regards -- Frederic Soulier DSI / Service Système Université Toulouse 1 Capitole 2 rue du doyen Gabriel Marty 31 042 Toulouse Cedex 9 Tel: +33 5 61 63 39 98 Fax: +33 5 61 63 37 98

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[libvirt-users] Cgroup
by Nikita A Menkovich 24 Jan '11

24 Jan '11

Hello, I'm running Debian Sid with libvirt/qemu/kvm packages from experimental: $ qemu --version QEMU emulator version 0.13.0 (Debian 0.13.0+dfsg-2), Copyright (c) 2003-2008 Fabrice Bellard $ kvm --version QEMU emulator version 0.13.0 (qemu-kvm-0.13.0 Debian 0.13.0+dfsg-2), Copyright (c) 2003-2008 Fabrice Bellard $ libvirtd --version libvirtd (libvirt) 0.8.6 /etc/libvirt/qemu.conf cgroup_controllers = [ "cpu", "devices" ] cgroup_device_acl = [ "/dev/null", "/dev/full", "/dev/zero", "/dev/random", "/dev/urandom", "/dev/ptmx", "/dev/kvm", "/dev/kqemu", "/dev/rtc", "/dev/hpet", "/dev/net/tun", ] /etc/cgconfig.conf mount { cpu = /dev/cgroup/cpu; cpuacct = /dev/cgroup/cpuacct; devices = /dev/cgroup/devices; # memory = /dev/cgroup/memory; blkio = /dev/cgroup/blkio; } When I'm running virsh, and want to change cpu shares I receive an error virsh # schedinfo --set cpu.shares=2048 test Scheduler : posix error: internal error cannot find cgroup for domain test Really I didn't have any group test in $ ls /dev/cgroup/cpu/sysdefault/libvirt/qemu/ cgroup.clone_children cgroup.event_control cgroup.procs cpu.shares notify_on_release tasks It happens if I run libvirt as usual user, how can I grant access to create cgroup to ordinary user? -- Nikita A Menkovich JID: menkovich(a)gmail.com

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[libvirt-users] Python Bindings for Python 2.7
by vipul borikar 20 Jan '11

20 Jan '11

Hello, I want to source compile the libvirt 0.8.4 with its Python bindings. I have python 2.4 rpm installed but i dont use it. I use Python 2.7 source compiled version. So when i compile libvirt it produces bindings for Python 2.4 which is obvious choice since it is rpm. So how should i make it point to Python 2.7 so that it produces bindings for it. Installed path of Python 2.7 is /opt/Python2.7. Please Guide me. Thanks Vipul

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[libvirt-users] virt-install with --channel option inquiry
by Hongqing Yang 20 Jan '11

20 Jan '11

hi, virt guys, This is Hongqing from Fedroa QA team. I try to forward the guest installation logs to host with virtio. I have used virsh edit <guestName> to add a channel, it works fine. I think it would be better if I can initialize it when I create the guest using virt-install, and virt-install also offers the option, I have tried below, but it does not work. virt-install --connect qemu:///system \ --virt-type kvm \ --name demo2 \ --ram 500 \ --disk path=/home/hongqing/testscript/demo2.img,size=10,sparse=true \ --accelerate \ --cdrom /home/hongqing/fedora/Fedora-14-x86_64-DVD.iso \ --channel tcp host=127.0.0.1:6080 mode=connect target_type=virtio name=org.fedoraproject.anaconda.log.0 error message is : ERROR internal error Process exited while reading console log output: char device redirected to /dev/pts/20 getaddrinfo(127.0.0.1,None): Servname not supported for ai_socktype chardev: opening backend "socket" failed both the host and guest are fedaora 14. I have checked the service syslog with port 6080 is listening. and also I have disabled the SElinux. Do you have any idea about this? Thanks for taking time to view it. Hongqing YANG

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[libvirt-users] Getting CPU and memory usage statistics for the host
by Guido Winkelmann 19 Jan '11

19 Jan '11

Hi, I have noticed that virt-manager has the ability to show me the current cpu- and memory-usage of both the host and running guest machines. How does it do that? I could make good use of that information myself in the client applications I'm writing, however, from what I can see on http://libvirt.org/html/libvirt-libvirt.html, I have no idea how to go about getting it from libvirt. In fact, before I've seen virt-manager, I just assumed libvirt cannot do that at all, and was planning to manually ssh to the host and read statistics from /proc when I'd need them. I've tried looking at the virt-manager source code to find out how to do this, but it appears I would have to learn Python first in order to understand it. Could someone please give me some pointers? Regards, Guido

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[libvirt-users] host to VM serial device configuration
by John Paul Walters 19 Jan '11

19 Jan '11

Hi, I'm trying to get a virtual serial device up and running between my host and virtual machine with a device name on the host. I'm using libvirt 0.8.3 and qemu 0.13.0. The challenge that I'm running into is that I'm able to get a serial device, but I cannot fix it to a pre- defined device name. For example, I'm using the following in my VM's xml file: <serial type='pty'> <source path='/dev/pts/19' /> <target port='0' /> </serial> As I said this works, but it doesn't set the host side to /dev/pts/ 19. Is there any way to do this? thanks, JP

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[libvirt-users] Libvirt Windows 0.8.7 installer available
by Justin Clift 18 Jan '11

18 Jan '11

Hi all, The Libvirt 0.8.7 installer for Windows is now available online: http://libvirt.org/sources/win32_experimental/Libvirt-0.8.7-2.exe Changes for this release include: + VirtualBox support on Windows, as added to the main Libvirt 0.8.7 release. I haven't personally tested this yet, so if someone has the time to test and report/confirm it's working, that would be really helpful. + There is now an option to update the system PATH with the libvirt binaries location, so they don't have to be copied around if you're using the .dlls elsewhere. + The README text has been tweaked to be less confusing for vSphere ESX users reading about TLS certificates All thoughts and feedback are welcome. :) Regards and best wishes, Justin Clift

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[libvirt-users] list mac or IP of all guests NICs?
by Josiah Ritchie 18 Jan '11

18 Jan '11

I'm trying to figure out how to use virsh (or something else) to list all the IP addresses (or MAC addresses if needed) for each virtual NIC, preferably with it domain affiliation also listed. Is this possible? Thanks, JSR/

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[libvirt-users] Open virt-viewer with virsh start
by Scott Lerman 18 Jan '11

18 Jan '11

Is it possible to have virt-viewer come up when a domain is started with virsh start, the same way that it does with virt-install? Thanks. --- Scott Lerman

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[libvirt-users] ERROR Unable to deny all devices for (solution)
by Lucas Arbiza 14 Jan '11

14 Jan '11

Hi. This is not a question, I had the following problem and I want to share my solution. ------- I tried to create a new virtual machine with this command: $ virt-install --connect qemu:///system -n vmTeste -r 512 -f /var/lib/libvirt/images/vmTeste.qcow2 -s 2 -c /media/Data/isos/debian-506-amd64-netinst.iso --vnc --noautoconsole --accelerate --hvm And I got this error: ERROR Unable to deny all devices for vmTeste: No such file or directory Traceback (most recent call last): File "/usr/bin/virt-install", line 1033, in <module> main() File "/usr/bin/virt-install", line 915, in main start_time, guest.start_install) File "/usr/bin/virt-install", line 957, in do_install dom = install_func(conscb, progresscb, wait=(not wait)) File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 973, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 1038, in _do_install "install") File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 1009, in _create_guest dom = self.conn.createLinux(start_xml, 0) File "/usr/lib/python2.6/dist-packages/libvirt.py", line 1277, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: Unable to deny all devices for vmTeste: No such file or directory I found the same error looking for in the internet, similar errors including in this list. I tried to solve changing permissions, editing xml and defining the virtual machine, etc. No long time ago I made some changes to optimize kernel performance for desktop as described here (it's in Portuguese, but can be undertood reading the commands and files) and this changes caused the above errors (in Ubuntu 10.10 and Fedora 14). I undid the changes and I had no more errors. Possibly I can be wrong, but it worked for me. __ *Lucas Arbiza* email: lucas.arbiza(a)gmail.com celular: +55 (55) 9152 7561 Twitter: http://twitter.com/lucasarbiza Facebook: http://www.facebook.com/lucas.arbiza Google Profile: http://www.google.com/profiles/lucas.arbiza <http://www.google.com/profiles/lucas.arbiza>LinkedIn: http://br.linkedin.com/in/lucasarbiza

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