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[libvirt-users] Remote virtualization with Xen, feasibility
by Jørgen Nordmoen 22 Jun '12

22 Jun '12

Hello. I'm wondering if a scenario which I'm tasked to setup would be feasible to create with libvirt. The scenario is; we want to have one computer running ns-3[1] which will simulate a MANET[2] this computer will be connected to a second computer(how is not quite clear to me yet) this second computer will be running several Xen or LXC domains where each domain is connected to a node in the ns-3 simulation. Inside each domain we will run an program which will use service-discovery to interact with all the other domains which from the point of view of a specific domain will look like wireless nodes in a network(accomplished with the ns-3 simulation, connecting the ns-3 nodes to taps[3] outside the simulation and then connecting these taps to the remote computer running libvirt and Xen or LXC). What I'm wondering is if the libvirt side of this is feasible, namely creating several domains remotely, on one or hopefully more computers, having the domains on the same computer share a storage area where we can place shared programs and where programs running inside the domains can log output to. Then after the program is done retrieve these output logs and shutdown all of the domains. When it comes to Xen, we will most likely crate a snapshot of a running Linux distribution that we can quickly start so we don't need to do a full boot process every time. Below is a very simple illustration of what we want to accomplish. Each Xen domain is connected to a specific tap device in the ns-3 server. ns-3 server libvirt server +----------------------+ +-----------------------------+ | | | +-----+ +------+ | | +-------------+ | | |Xen1| ... |XenX| | | | ns-3 | | | +-----+ +------+ | | +-------------+ | | | | tap-1 ... tap-X | | | +----------------------+ +-----------------------------+ | | | | ------------------------------------------------------------------------------------ LAN Is this possible to create with the help of libvirt? Ps. My reasoning to want to do this with libvirt is that we get support for both Xen, QEMU/KVM and LXC and libvirt has, from my first impressions, good support for Python which means quicker prototyping and better looking code. Best regards Jørgen Nordmoen [1] http://www.nsnam.org [2] https://en.wikipedia.org/wiki/MANET [3] https://en.wikipedia.org/wiki/TUN/TAP

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[libvirt-users] Libvert live migration problem!
by GaoYi 22 Jun '12

22 Jun '12

Hi all, I've succeed to do live migration between two PCs. However, I found I could not connect the VM by host IP from a remote PC before migration and can only connect it from host PC. If I appended the VM with the following line at the end of the xml file: <listen type='address' address=host_IP port='PORT'> I can connect the VM via VNCVIEWER with host_IP:PORT. However, the libvirt reported: error: failed to bind the <host_IP, PORT>...It seems that the IP:port is already bound. Can someone show how to do live migration using NFS? Thanks, Yi

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[libvirt-users] Cannot create macvlan devices on this platform
by Michael Hierweck 21 Jun '12

21 Jun '12

Hi, libvirt (0.9.11) refuses to start KVM based virtual machines on my system when changing the network connection from "host bridge" to "direct" (macvtap/macvlan), neither in "bridge" nor in "vepa" mode: "Cannot create macvlan devices on this platform" That's astonishing because I can easily setup working macvlan devices using the "ip" command: "ip link add link eth0 type macvlan". Would someone help me figure out the reason? Thanks in advance Michael -- EDV-Serviceteam Annika & Michael Hierweck GbR Egerstraße 53, 44225 Dortmund (Germany) http://www.edv-serviceteam.net

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[libvirt-users] getting name or uuid of vm within guest OS
by Behrooz 21 Jun '12

21 Jun '12

Hi, for tl;dr people: how we can get uuid or name of a vm within a guest os? description: We are trying to implement a guest-agent for Archipel* to let us run simple commands on guest os**. in archipel each vm has its own jid (jabber id), user will open a chat conversation to vm's jid and send messages like "!exec ls", then we check that user (jid) who sent !exec has permission to run commands on our guest. if he/she had permission we will send a message to jid of guest-agent with message "ls", guest-agent will run command then will send result to vm's jid and we tunnel result to user. now problem is that we don't know (in guest-agent) that what xmpp server we should connect to and what jid is trusted to recieve command from. xmpp server is running on hypervisor and trusted jid is {uuid-of-jvm}(a)hypervisor.com. right now we've used internal dhcp to set hostname of guest os to something like "uuid-of-jvm.hypervisor.com" using this switch (qemu): -net user,hostname=uuid-of-jvm.hypervisor.com it works but it's not best solution as it only works with qemu and we need a solution that works with other virtualization platforms that libvirt supports. * https://github.com/ArchipelProject/ ** yes, we know about vnc / ssh / ... but by implementing such thing we can add cool stuff in archipel like status of services that are running on guest os. -- regards, behrooz

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[libvirt-users] How to obtain guest's monthly internet bandwidth usage?
by Tony Huang 21 Jun '12

21 Jun '12

Hello, I want to monitor the outgoing and incoming monthly internet usage. How can I do that? -- Tony

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[libvirt-users] update virDomainDef with xml config
by xuanmao_001 20 Jun '12

20 Jun '12

Libvirt Version: 0.9.8 Hi: I added a new api for qemu_driver. and both added libvirt.c and remote. I tested it and it worked well. the function of this new api was add a new field in xml config of domain. (I added it like qemudDomainSetMemoryFlags)at the same time, I added a new member to struct virDomainDef. then I tested xml config converted to virDomaindef and virDomainDef converted to xml config both well(just tested this new api). But there was a problem, if I change the memory size or cpu number then apply it with virtManager. the xml config was changed. but there is no field in the xml what I added. I guest the virDomainDef member in virDomainObjPtr wasn't update. I have no idea, can you give me some ideas? thanks! here is my code in qemu_driver.c: static int qemudDomainSetCustomOptions(virDomainPtr dom, char *opt) { struct qemud_driver *driver = dom->conn->privateData; virDomainObjPtr vm; virDomainDefPtr persistentDef = NULL; int ret = -1; qemuDriverLock(driver); vm = virDomainFindByUUID(&driver->domains, dom->uuid); qemuDriverUnlock(driver); if (!vm) { char uuidstr[VIR_UUID_STRING_BUFLEN]; virUUIDFormat(dom->uuid, uuidstr); qemuReportError(VIR_ERR_NO_DOMAIN, _("no domain with matching uuid '%s'"), uuidstr); goto cleanup; } if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) goto cleanup; if (!vm->persistent) { qemuReportError(VIR_ERR_OPERATION_INVALID, "%s", _("cannot change persistent config of a transient domain")); goto endjob; } if (!(persistentDef = virDomainObjGetPersistentDef(driver->caps, vm))) goto endjob; sa_assert(persistentDef); persistentDef->running_mode = opt; ret = virDomainSaveConfig(driver->configDir, persistentDef); ret = 0; endjob: if (qemuDomainObjEndJob(driver, vm) == 0) vm = NULL; cleanup: if (vm) virDomainObjUnlock(vm); return ret; } xuanmao_001

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[libvirt-users] caps->nguests == 0?
by Zhihua Che 20 Jun '12

20 Jun '12

hi, I compiled the libvirt-0.9.10 and started the libvirtd with sudo. Unfortunately, I got an Error, saying 'virDomainDefParseXML unknown OS type hvm'. I debugged it and found in function virCapabilitiesSupportsGuestOSType, the parameter caps->nguests is 0. On the other hand, I tried start the libvirtd with common user, and creating domain with virsh, i found the caps->ngusts is 2 and had one value 'hvm', so it didn't complain the error above, instead, it complained could not load PC BIOS bios.bin. I'd say I searched a lot and people say it's caused by without loading kvm and kvm-intel module. So, I checked and it is loaded. Any tips here?

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[libvirt-users] unsupported configuration: Reboot is not supported with this QEMU binary
by Xing.x.Gao 19 Jun '12

19 Jun '12

Hello, when i use virsh to reboot a guest,it report a "unsupported configuration: Reboot is not supported with this QEMU binary" error . my libvirt version 0.9.10 and i've tried 0.9.11/12 ,the debug info is in the attachment libvirtd.log, virsh # version --daemon Compiled against library: libvir 0.9.10 Using library: libvir 0.9.10 Using API: QEMU 0.9.10 Running hypervisor: QEMU 0.14.0 Running against daemon: 0.9.10 virsh # list Id Name State ---------------------------------------------------- 6 win7 running 7 f16 running virsh # reboot f16 error: Failed to reboot domain f16 error: unsupported configuration: Reboot is not supported with this QEMU binary thanks.

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[libvirt-users] How to update the QEMU of libvirt?
by GaoYi 18 Jun '12

18 Jun '12

Hi all, I type "version" and the virsh outputs: Compiling library: libvir 0.6.3 ... Management: QEMU 0.9.1 Now I wanna update the QEMU to qemu-kvm-0.14.0. I don't know how to. Can anybody provide any help? Yi

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[libvirt-users] How to set cpu limits to xen domU in libvirt
by Tony Huang 18 Jun '12

18 Jun '12

Hello, I looked in the the documents. Looks like the <cputune> period and quota will only support qemu driver. Of for xen user, how to set the hard cpu limit? -- Tony

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