- Users - libvirt List Archives

[libvirt-users] How to securely license guests?
by David Knierim 05 Feb '12

05 Feb '12

Hi, I have been asked to research and recommend a method to securely license guests on RHEL/KVM 6.2+ hosts. The guests will be running CentOS or RHEL (5.X or 6.2+). The primary driver to license the software is that we will be selling Telecommunications software in countries where it is common to pirate software. As such, we are worried about the software being purchased one time and then multiple instances of the software being used. We plan to use a USB security dongle (I hate that word!) of some kind. If we were running without virtualization, the solution is pretty straight forward. We would install the security dongle on the server and compile the licensing library which accessed the dongle into our code. We understand that this could be circumvented by a dedicated foe, but it would be reasonably secure. However, as soon as the licensed code is running in a guest, things get a lot more complicated. My first thought was that we could use PCI passthrough to map the USB controller to one guest. Unfortunately, they want to have multiple guests access the same security dongle concurrently. I could see using a bridge that is only on the host to allow the guests to communicate with the host which proxies the requests to the security device. However, it would be pretty easy to connect a network tunnel to the bridge which could allow guests at remote sites to access the security dongle and this would allow the licensed software to be replicated. Can anyone recommend a solution or partial solution to this issue? Any thoughts are welcome, David

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[libvirt-users] Deploying OVF on Different virtual platforms
by Nikunj Badjatya 04 Feb '12

04 Feb '12

Hi All, I am new to Virtualization and Libvirt. Pardon if any information is missing.! I am using VMware PowerCLI And Python to automate tasks for managing my Virtual Infrastructure. I have recently come across Libvirt. and have certain questions. Q1. Can Libvirt be used to deploy OVFs on ESX servers.? Q2. If I wrote a script using Libvirt's Python binding ( A simple one, Say turn on/off/suspend VM) , will that script work on different virtualisation platforms.( HyperV, XEN, VMware-ESX ) ? Q3. Is there a suitable reference for Libvirt's Python APIs ? Thanks, Nikunj Bangalore-India

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Re: [libvirt-users] Can a VM tell what host it's on?
by Paul Lussier 04 Feb '12

04 Feb '12

On Thu, Feb 2, 2012 at 2:08 PM, Eric Blake <eblake(a)redhat.com> wrote: > Did you mean for this to go to the list? Yes, sorry :) > On 02/02/2012 12:04 PM, Paul Lussier wrote: >> On Thu, Feb 2, 2012 at 1:52 PM, Eric Blake <eblake(a)redhat.com> wrote: >>> On 02/02/2012 11:33 AM, Whit Blauvelt wrote: >>>> Is there a way internal to a KVM VM to know which host it's running on? >>> >>> No. The ideal hypervisor is one where the guest doesn't even know it is >>> running as a virtual machine. And consider live migration - a guest >>> might not be running on the same host over its lifetime. Therefore, >>> there should be nothing that requires a guest to know which host it is >>> running on. >> >> From a system administration perspective, though, it's imperative to >> know what physical hosts your VMs are running on. Perhaps the VM >> itself doesn't know, but the sysadmin should be able to have some >> means of figuring this out in a dynamic manner, not simply by "keeping >> track" of where VMs are deployed. > > Yes, but that's a different question. It's not the guests' job to know > which host they are running on, rather, it's the management app _outside > of the guests_ that knows which hosts are running which guests. What do you mean by "management app", virt-manager, or something else ? >>> Why do you think you need it? Perhaps if you ask a better question >>> about what you are really trying to solve, we can give a better answer. >> >> Asset tracking, physical host trouble-shooting, etc. If I'm running >> an environment with 2K physical systems, each of which are running 20+ >> VMs, and someone reports a problem with vm-23475, it would be really >> nice to know that I can ask that VM where it is on my network and on >> what physical hosts. Especially if that VM has been around a while >> and possibly migrated to/from several physical systems. > > That's more a question you should be directing to your management app, > not to your guest. Your management app should know which host is > currently running vm-23475; you shouldn't have to directly query > vm-23475 itself (besides, if you treat guests as untrusted code, you > wouldn't want to rely on any answer vm-23475 gave you in the first place). While I agree with you in principle, my impression is that people are not treating guests as untrusted code, but rather, almost exactly like physical hosts. Perhaps I haven't had the luxury of being in a virtual environment where people are doing things the way they were intended :) -- Paul

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[libvirt-users] Can a VM tell what host it's on?
by Whit Blauvelt 03 Feb '12

03 Feb '12

Is there a way internal to a KVM VM to know which host it's running on? It could send a command via ssh to virsh on a host, and learn from that whether the host currently has it running. But is there something within the VM itself which will reveal this? Thanks, Whit

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[libvirt-users] I want to ask How can I get something like id, uuid, its dom0 in the domU ?
by Ming Q 02 Feb '12

02 Feb '12

hello! I'm new here. I want to ask How can I get something like id, uuid, its dom0 in the domU ?

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[libvirt-users] Gigabit network card not fully operational using KVM/Ubuntu
by Josir Cardoso Gomes 02 Feb '12

02 Feb '12

Hi folks, *Host:* Ubuntu 10.04.3 with KVM lspci | grep net 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06) *Guest:* Ubuntu 10.04.3 lspci: 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02) 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] 00:01.2 USB Controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01) 00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03) 00:02.0 VGA compatible controller: Cirrus Logic GD 5446 00:03.0 Ethernet controller: Qumranet, Inc. Virtio network device *Problem:* The virtio network device operates on 100Mbits. How do I know that it operates on 100Mbits ? I copy a single big file via rsh and I can see the real speed. The network is completely dedicated to this operations, that is, there is no other traffic between other machines. *Question:* What do I have to do to use full bandwidth ? If this is not the best forum to ask this question, do you suggest another channel ? Thanks in advance, Josir Gomes

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[libvirt-users] libvirt 0.9.4-23 on CentOS 6.2 with xen support
by Rudolf Ladyzhenskii 01 Feb '12

01 Feb '12

Hi, all I am trying to install xen on CentOS 6.2. (64 bit on Intel CPU). I am at the stage when xen kernel is app and running and xend is running. Next issue is that I am getting following message when tyring to run virt-manager: no connection driver available for No connection for URI xen:/// Some Google search pointed me to the fact that libvirt as installed from CentOS repository is not built with xen support. I found some quides on how to rebuild libvirt from source with patches for xen support and follow them. I am trying to rebuild libvirt version 0.9.4-23, as this is the rpm that was installed on CentOS. I am getting an error as I build the rpm. xencapstest fails. So, there are few questions: 1. Is there an easier way to get libvirt to work with xen? 2. If rebuilding of RPM is the only option, how do I fix xencaps error? Thanks, Rudolf P.S. Guide I am trying to follow is: http://www.howtoforge.com/virtualization-with-xen-on-centos-6.2-x86_64-para…

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[libvirt-users] Libvirt migration issues (0.9.4 and 0.9.9)
by Daniel Espling 01 Feb '12

01 Feb '12

Dear all, we're having two different problems with migrations in libvirt, running as root user on host machines with CentOS release 5.5 (Final), kernel: Linux 2.6.32.24 #3 SMP Fri Oct 29 16:22:02 BST 2010 x86_64 x86_64 x86_64 GNU/Linux First case: virsh version Compiled against library: libvir 0.9.4 Using library: libvir 0.9.4 Using API: QEMU 0.9.4 Running hypervisor: QEMU 1.0.50 Migrations work well for a basic VM, but if we attach a disk to the usb bus migration is no longer possible and fails with the error message: "error: operation failed: migration job: is not active". This is regardless of if the device is mounted inside the VM or not (debian). Please find more information attached. If we attach the same (.iso based) disk to the scsi bus instead, migrations work as normal. ---- To mitigate this problem, we tried upgrading to a more recent libvirt version: Compiled against library: libvir 0.9.9 Using library: libvir 0.9.9 Using API: QEMU 0.9.9 Running hypervisor: QEMU 1.0.50 When trying to migrate a normal (debian) instance from one host to another using the same domain as in the previous successful case without any devices attached, migration fails with the error message "error: Unable to copy socket file handle: Invalid argument". The libvirt.log only has a similar single-line of information: 2012-01-30 15:44:46.772+0000: 7546: error : virNetSocketDupFD:787 : Unable to copy socket file handle: Invalid argument. The network configuration used here is the same as we successfully used in the 0.9.4 test case, using static ip's. Thankful for assistance, not really sure what to try next. :) Regards, Daniel Espling

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[libvirt-users] libvir: error : cannot getpwuid_r(107): Success
by vipul borikar 31 Jan '12

31 Jan '12

I am on RHEL 6.1 running KVM. I am getting following error when i start a Ubuntu 11.10 Guest I am attaching my xml file . # virsh -c qemu:///system create Ubuntu-110.10.xml error: Failed to create domain from Ubuntu-110.10.xml error: internal error Process exited while reading console log output: 16:19:53.991: 2418: info : libvirt version: 0.8.7, package: 18.el6 (Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>, 2011-04-18-10:28:30, x86-008.build.bos.redhat.com) 16:19:53.991: 2418: error : virSetUIDGID:2905 : cannot getpwuid_r(107): Success libvir: error : cannot getpwuid_r(107): Success Where should i looks for more info??? -- Thanks Vipul Borikar "Our task must be to free ourselves...by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty."

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[libvirt-users] How to change libvirt / cgroup interaction?
by Samuel Hassine 27 Jan '12

27 Jan '12

Hi there, Do you know if there is a way to modify how libvirt interacts with the cgroup? Because, I successfully add the /dev/net/tun support in my LXC container by doing: echo c 10:200 rwm >> /cgroup/libvirt/lxc/instance-00000005/devices.allow But when I restart the instance/LXC container, this option has gone. How can I make this persistant? Is there a configuration file? Thanks for your answers. Best regards. Sam

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[libvirt-users] Preventing 'virsh start' while doing backup?
by Ken Coar 26 Jan '12

26 Jan '12

Is there any way to interface with virsh to keep it from executing a startup operation? Sort of like the /etc/nologin (man page nologin(5)) mechanism? Basically, I want to be able to shut down a VM in order to copy its disk images, and be reasonably assured that it won't be started before I'm finished. Is there any sort of hook or interlock file or other mechanism to accomplish this? Thanks! -- #ken B-)} Ken Coar, Sanagendamgagwedweinini IT Engineering Tower, Red Hat/RDU "Millennium hand and shrimp!"

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[libvirt-users] how to change existing domain xml?
by p-man314＠mail.ru 26 Jan '12

26 Jan '12

Hi. I'm trying to change network settings for a domain via libvirt (the driver is xenapi) with no success. According to its sources, 'virsh edit' uses virDomainGetXMLDesc(), allows to edit the received xml and then use virDomainDefineXML(). In case of xenapi driver it leads to a new vm creation (with the same name and edited settings). Looking through the list of API functions I failed to find a function like virDomainUpdateXML() that would change configuration of existing domain. Could you please suggest a way to do it? Thanks in advance.

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[libvirt-users] ANNOUNCE: oz 0.8.0 release
by Chris Lalancette 25 Jan '12

25 Jan '12

All, I'm pleased to announce release 0.8.0 of Oz. Oz is a program for doing automated installation of guest operating systems with limited input from the user. Release 0.8.0 is a (long overdue) bugfix and feature release for Oz. Some of the highlights between Oz 0.7.0 and 0.8.0 are: - Optional virtualenv make target - Conversion of unittests to py.test - Replace mkisofs with genisoimage - Debian package - Ability to change the root password for Debian installs - Add unittests for ozutil - Add some unittests for the Guest object - SSH tunnel (with SSL vhost) support for local repositories (mostly useful for imagefactory) - Add a new manpage for oz-examples - Make the output filename configurable with a command-line option to oz-install - Monitor both network and disk activity when looking for guest activity - Support for installing Ubuntu 11.10 - Support for SSL certificates for repositories - Support for an optional version in the TDL - Support for installling Mandrake 9.1, 9.2, 10.0, 10.1, 10.2 - Support for installing Mandriva 2006.0, 2007.0, 2008.0 - Support for Ubuntu customization - Support for installing RHEL 6.2 A tarball of this release is available, as well as packages for Fedora-16. Instructions on how to get and use Oz are available at http://aeolusproject.org/oz.html If you have any questions or comments about Oz, please feel free to contact aeolus-devel(a)lists.fedorahosted.org or me (clalancette(a)gmail.com) directly. Thanks to everyone who contributed to this release through bug reports, patches, and suggestions for improvement. -- Chris Lalancette

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[libvirt-users] [Problem] C# virDomainShutdown
by Danny Fonk 25 Jan '12

25 Jan '12

Hey there, im using libvirt since 2 weeks now and there are still some issues im confronted with. I use libvirt in C# and I'm running a 32-bit machine on Windows 7. Actually my worst problem is, is that I'm not able to Shutdown on machine no matter which command I'm using. virDomainShutdown isn't working nor virDomainDestroy. Basically I use the virConnectOpenAuth example to make a test on this. You'll find a code-excerpt in the attachment. Everything else is working. Like Domain.GetName etc. - i just can't figure out the failure and I wanted to ask if the mistake is in the API since it's not tested on a 32-bit Windows. Already thanks for the support. Best regards, D. Fonk -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

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[libvirt-users] Question about libvirt / LXC
by Samuel Hassine 24 Jan '12

24 Jan '12

Hi there, I have a small simple question about libvirt and LXC containers. I know how to activate /dev/net/tun in an LXC container: #tun lxc.cgroup.devices.allow = c 10:200 rwm in the LXC config file. But, how to do that in a libvirt XML file? I just need to activate the /dev/net/tun device in an LXC container using libvirt. Thanks for your answers! Best regards. Sam

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[libvirt-users] oVirt setup issues
by Christian Parpart 24 Jan '12

24 Jan '12

Hi all, as suggested in a prior mail, I was now trying out oVirt - however, on a non-Redhat/Debian system - and ran into huge issues primary due to the lag of information / documenation. So here my assumptions: * oVirt is a web application based on JBoss application server. * VDSM is an agent to run on every hypervisor (or also VM?) * nothing else needed? (despite jboss, java-jdk-1.6, python-2.7, maven-2.2) I tried following the install-from-source guides for oVirt and failed at a compilation error. # cd $OVIRT_ENGINE_SRCDIR # make [.....] [INFO] Compiling 186 source files to /opt/ovirt/src/ovirt-engine/backend/manager/modules/dal/target/classes [INFO] ------------------------------------------------------------------------ [ERROR] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Compilation failure /opt/ovirt/src/ovirt-engine/backend/manager/modules/dal/src/main/java/org/ovirt/engine/core/dal/dbbroker/PGHack.java:[9,7] error: PGHack is not abstract and does not override abstract method getParentLogger() in CommonDataSource [...] There are no remote branches nor tags that looked like "stable" that I could test on, too. So finally (the not favoured version), I tried putting a Fedora 16 netinstall into a KVM on my hypervisor-test-node and installed everything in there, again, following some guide from the upstream site. Since it did not compile anything, the install worked well, but I could not add my hypervisor node as a host, in fact, it complained about some tools not being able to be installed. What tools? VDSM? how am I supposed to "cleanly" install it if not as promoted on the install guide? :( In the end, I am having nothing working, feeling a little bit sad about the possibly wasted time, so I hope you guys can give me a hint on how to deal with VDSM (if that's what I am missing here) and how to deal with the compile error when installing from source. Best regards, Christian Parpart.

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[libvirt-users] gPXE fails automatically, succeeds with manual autoboot
by Paul Lussier 24 Jan '12

24 Jan '12

Hi Folks, I'm trying to auto-create a VM using a kickstart server and gPXE with my VMs. The underlying physical host is CentOS 6.0 running libvirt-0.8.1-27, and libvirt-python 0.8.1-27, virt-manager 0.8.4-8. The underlying network config on the physical host is: # ip -o -4 addr show 1: lo inet 127.0.0.1/8 scope host lo 6: vnet0 inet 10.8.31.61/23 brd 10.8.31.255 scope global vnet0 7: vnet1 inet 10.0.4.249/24 brd 10.0.4.255 scope global vnet1 8: virbr0 inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 I'm attempting to create the new VM with the following command-line: # /usr/bin/virt-install -n test -r 2048 --vcpus=2 --disk path=/var/lib/libvirt/images/test.img,size=25 --pxe --os-type=linux --os-variant=rhel6 --network bridge=vnet0,mac=52:54:00:07:51:1e --autostart So, I'm trying to create the VM with one NIC, bound to the vnet0 interface on the physical host. The physical host is both the PXE/DHCP server (using cobbler) and the kickstart server. When I run the above virt-install command, while simultaneously running 'tcpdump -i vnet0 -n port 67 or port 68' on the physical host, the VM powers on, boots up, and attempts to PXE boot. However, I never see any traffic on the physical host's vnet0 interface, nor does the DHCP server log any requests. If I boot the VM, then hit Ctrl-B to drop into gPXE's prompt and type autoboot, the first invocation fails, but the second one succeeds. Has anyone seen this kind of behavior ? Is this indicative of a configuration issue on the physical host? An underlying network problem ? Or am I missing an option on my command-line ? I'm a little stumped here, and hoping someone can point me in the right direction. I'm more than happy to RTFM if someone can tell me which M to F'ing R :) -- Thanks Paul

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[libvirt-users] libvirt 0.9.9: could not open /dev/net/tun: Operation not permitted
by Fischer, Anna 24 Jan '12

24 Jan '12

Hi, I'm running the latest libvirt 0.9.9. I'm trying to start a VIF of type "Ethernet". I know there are problems with that because you need to be root in order to control the tun/tap driver. I changed my qemu.conf file to user = "root" group = "root" clear_emulator_capabilities = 0 However, I still get an error when trying to start my VM: [root]# virsh start vm-0-3 error: Failed to start domain vm-0-3 error: internal error process exited while connecting to monitor: qemu-system-x86_64: -net tap,ifname=vif-0-3,script=/etc/libvirt/qemu/vif-vnet-up,vlan=0,name=hostnet0: could not open /dev/net/tun: Operation not permitted qemu-system-x86_64: -net tap,ifname=vif-0-3,script=/etc/libvirt/qemu/vif-vnet-up,vlan=0,name=hostnet0: Device 'tap' could not be initialized I run the latest qemu-kvm. The permissions on the tun device are set to default settings and my scripts are executable by anyone: [root ~]# ll /dev/net/tun crw-rw---- 1 root root 10, 200 Jan 20 15:39 /dev/net/tun [root ~]# ll /etc/libvirt/qemu/vif-vnet-* -rwxrwxrwx 1 root root 150 Jan 17 15:52 /etc/libvirt/qemu/vif-vnet-down -rwxrwxrwx 1 root root 137 Jan 19 17:51 /etc/libvirt/qemu/vif-vnet-up Any idea what I'm doing wrong here? I have actually also compiled libvirt with --without capng, so it should not drop capabilities anyway. Why does it not run as root? Thanks, Anna

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[libvirt-users] span port from cisco switch to host to guest using kvm
by nemus＠grayhatlabs.com 23 Jan '12

23 Jan '12

I am trying to get the equivalent of promisc mode to pass all received traffic to a kvm guest that is running snort. So I have a cisco switch with span port plugged into eh2 on my kvm host which is centos. I want the kvm host to forward all promisc traffic from the span port to the guest running snort of tcpdump. What would be the best way to do this?

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[libvirt-users] Kickstart file doesn't work
by Sarath P R 21 Jan '12

21 Jan '12

I am starting an instance passing xml configuration like this. Contents inside my kickstart file is this *apt-get install vim --assume-yes* . But I think kickstart is not considered while booting instance though I am able to start instance. Please help. Thanks in advance "<domain type='xen'>" + " <name>testVM-server</name>" +" <description></description>" +" <memory>524288</memory>" +" <currentMemory>524288</currentMemory>" +" <vcpu>1</vcpu>" + " <os>" * + " <type>hvm</type**>" + " <kernel>/home/x**entest/Desktop/**vmlinuz</kernel**>" + " <initrd>/home/x**entest/Desktop/**initrd</initrd>**" + " <loader>/usr/li**b/xen-4.1/boot/**hvmloader</load** er>" + " <boot dev='hd'/>" + " <cmdline>ks=http://10.30.6.3/testVM-server.cfg </cmdline>" + " </os>"* + " <on_poweroff>destroy</on_poweroff>" + " <on_reboot>destroy</on_reboot>" + " <on_crash>destroy</on_crash>" + " <devices>" + " <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>" + " <disk type='file' device='disk'>" + " <driver name='tap' type='aio'/>" + " <source file='/home/xentest/Desktop/ubuntu-server.img'/>" + " <target dev='xvda'/>" + " </disk>" + " <interface type='bridge'>" + " <source bridge='br0'/>" + " <script path='/etc/xen/scripts/vif-bridge'/>" + " </interface>" + " <serial type='pty'>" + " <target port='0'/>" + " </serial>" + " <console type='pty'>" + " <target type='serial' port='0'/>" + " </console>" + " <input type='mouse' bus='ps2'/>" + " <graphics type='vnc' port='5900' autoport='yes' keymap='en-us'/>" + " <sound model='es1370'/>" + " </devices>" + "</domain>"; -- Thank You Sarath P R | cell +91.999.502.4287

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[libvirt-users] unable to get libvirt work with libxenlight
by 杨镭 21 Jan '12

21 Jan '12

Hi all: I am having problem with libxenlight as the underlying xen drive. I compiled libvirt with configure flag: "--with-libxl". However, the output of command: ldd libvirt.so did not show a symbol link to libxenlight.so. I assume it should link to it, but I could be wrong. To verify libxenlight is working, I then stopped xend. After this, virsh -c xen:/// list can not list Domain-0 anymore. Only start xend can it display correct Domain-0 and DomU information. My libvirt version 0.9.9, Xen is 4.1.2. BTW, the xl command itself is ok after turning off xend. -- lei yang

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[libvirt-users] libvirt with sasl shadow backend
by Robyn Bachofer 20 Jan '12

20 Jan '12

Hi list, i have a problem with virt-manager authentication over tcp. I tried it with virt-manager over non-TLS "TCP (SASL/Kerberos)" auth. and the sasl mechanism "shadow". The user (tested with unprivileged user and root) is allready in the group libvirt(d) and the process is running as root. The result on host: Jan 18 21:05:31 host libvirtd: 21:05:31.620: error : remoteDispatchAuthSaslStep:3691 : sasl step failed -20 (SASL(-13): user not found: no secret in database) on client (virt-manager gui): ... ('virtConnectOpenAuth() faild') .. I have tested it with tool "testsaslauthd" and their result: e.g.: # testsaslauthd -u root -p root 0: OK "Success." When i set it manually with saslpasswd: # saslpasswd2 -a libvirt root -p it works. Although I use, in the configuration of sasl, shadow, libvirt does not use it (i think so). Host: debian6.0.3 (squeez) libvirt 0.8.3 (deb) sasl2.1.23 (deb) :-) Best regards, Robyn

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[libvirt-users] How to use "virDomainMemoryStats"? I got 0 result.
by mao weijie 20 Jan '12

20 Jan '12

I use like this; int n = virDomainMemoryStats(dom, stats, 4, 0); I want to get men used and not used. If can , I want to get all output in stats. but "n" result is always 0. 非淡泊無以明志，非寧靜無以致遠

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[libvirt-users] Should Windows NT guest use all of a CPU?
by Richard Walker 19 Jan '12

19 Jan '12

I've "ported" an old VMware VM containing Windows NT 4 SP6 into libvirt/kvm/qemu and got it running (more or less). However, the CPU graph next to the VM in virt-manager shows it starts using 100% of the allocated CPU as soon as it reaches the "OS Loader" screen, and stays there even after Windows has booted and I've logged in. (There's a dip now and then, apparently when something other than idling happens!) Windows NT Task Manager shows the CPU usage at 0%. I've tried with and without ACPI, and with different CPU settings (none/default, qemu32, pentium). No difference. Host is running Fedora 16 x86_64 with the latest updates: gpxe-roms-qemu-1.0.1-4.fc16.noarch qemu-kvm-0.15.1-3.fc16.x86_64 qemu-system-x86-0.15.1-3.fc16.x86_64 qemu-common-0.15.1-3.fc16.x86_64 qemu-img-0.15.1-3.fc16.x86_64 libvirt-0.9.6-4.fc16.x86_64 libvirt-client-0.9.6-4.fc16.x86_64 libvirt-python-0.9.6-4.fc16.x86_64 virt-manager-common-0.9.0-7.fc16.noarch virt-manager-0.9.0-7.fc16.noarch No other VM (Linux or Windows) behaves this way. I thought NT was deemed to be "well behaved" (e.g., uses HLT instruction), so I'm wondering if this is normal. ps shows (except for bits I've hidden): /usr/bin/qemu-kvm -S -M pc-0.14 -cpu qemu32 -enable-kvm -m 384 -smp 1,sockets=1,cores=1,threads=1 -name BPrjwtest -uuid <hidden> -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/BPrjwtest.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime -device lsi,id=scsi0,bus=pci.0,addr=0x6 -drive file=/home/libvirt/images/BPrjwtest.img,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive file=<hidden>,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=2 -netdev tap,fd=30,id=hostnet0 -device ne2k_pci,netdev=hostnet0,id=net0,mac=<hidden>,bus=pci.0,addr=0x4 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:3 -vga vmware -device AC97,id=sound0,bus=pci.0,addr=0x5 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

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[libvirt-users] possible to disable but not remove hardware?
by David Mansfield 19 Jan '12

19 Jan '12

I have a situation where I frequently need to "add" and "remove" a NIC, but each time I "add" it, I need the same MAC address. I'm using virt-manager mostly, but would be willing to use "virsh" if necessary, although it doesn't seem to hotplug the same way (something else to figure out another day ;-). It doesn't appear in the domain XML format that there is any "disabled" attribute than can be used. Is that true? Is there a different usage pattern to accomplish this? Thanks, David Mansfield Cobite, INC.

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