March 2017 - Users - libvirt List Archives

[libvirt-users] qemu-attach fails
by DS DS 08 Mar '17

08 Mar '17

Hi, I am using "qemu-attach" in virsh to attach to an existing qemu process so I can send monitor commands to it. the VM is started using qemu-kvm -net none -hda ./out.img -m 4G -nographic The VM gets started and the OS boots fine. Then, I start virsh and do a "qemu-attach 44273" which is the PID of the qemu process. virsh # qemu-attach 44273 error: Failed to attach to pid 44273 error: Cannot check QEMU binary qemu-kvm: No such file or directory qemu-kvm is in /usr/libexec. There is a symlink to it from /usr/bin and /bin. The virsh command "create" (for a different VM) works fine. What could be missing? Are there any debug/log messages/config files that can shed some light. Thanks.

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[libvirt-users] Help needed on a gentoo system after update to libvirtd 3.1.0
by Marko Weber | 8000 08 Mar '17

08 Mar '17

(sorry, dont know how i put my posting into an reply to an other issue before, new posting to sepearte it, big sorry) Hello list, i updated on a gentoo system from libvirtd 2.5 to 3.1.0 Now my windows machines cant access internet. I did a virbr1 with virt-manager and route it to the eth0, works fine on 2.5 Hello list, i updated on a gentoo system from libvirtd 2.5 to 3.1.0 Now my windows machines cant access internet. I did a virbr1 with virt-manager and route it to the eth0, works fine on 2.5 on install i get this: Important: The openrc libvirtd init script is now broken up into two separate services: libvirtd, that solely handles the daemon, and libvirt-guests, that takes care of clients during shutdown/restart of the host. In order to reenable client handling, edit /etc/conf.d/libvirt-guests and enable the service and start it: $ rc-update add libvirt-guests $ service libvirt-guests start For the basic networking support (bridged and routed networks) you don't need any extra software. For more complex network modes including but not limited to NATed network, you can enable the 'virt-network' USE flag. It will pull in required runtime dependencies If you are using dnsmasq on your system, you will have to configure /etc/dnsmasq.conf to enable the following settings: bind-interfaces interface or except-interface Otherwise you might have issues with your existing DNS server. For openrc users: Please use /etc/conf.d/libvirtd to control the '--listen' parameter for libvirtd. Use /etc/init.d/libvirt-guests to manage clients on restart/shutdown of the host. The default configuration will suspend and resume running kvm guests with 'managedsave'. This behavior can be changed under /etc/conf.d/libvirt-guests virt-manager starts fine and shows my vm´s. i dont touched /etc/dnsmasq cause i dont used it. so left untouched. yes, i added libvirt-guests with rc-update the virbr1 has 192.168.18.1 as address, and is reachable via ping from vm guest. but it cant resolve hostnames and cant ping ip´s outside the virtualisation host. anyone knows this effect after update? do i have to change some more things? or is this a bug? any help and hints are welcome thank you marko weber on install i get this: Important: The openrc libvirtd init script is now broken up into two separate services: libvirtd, that solely handles the daemon, and libvirt-guests, that takes care of clients during shutdown/restart of the host. In order to reenable client handling, edit /etc/conf.d/libvirt-guests and enable the service and start it: $ rc-update add libvirt-guests $ service libvirt-guests start For the basic networking support (bridged and routed networks) you don't need any extra software. For more complex network modes including but not limited to NATed network, you can enable the 'virt-network' USE flag. It will pull in required runtime dependencies If you are using dnsmasq on your system, you will have to configure /etc/dnsmasq.conf to enable the following settings: bind-interfaces interface or except-interface Otherwise you might have issues with your existing DNS server. For openrc users: Please use /etc/conf.d/libvirtd to control the '--listen' parameter for libvirtd. Use /etc/init.d/libvirt-guests to manage clients on restart/shutdown of the host. The default configuration will suspend and resume running kvm guests with 'managedsave'. This behavior can be changed under /etc/conf.d/libvirt-guests virt-manager starts fine and shows my vm´s. i dont touched /etc/dnsmasq cause i dont used it. so left untouched. yes, i added libvirt-guests with rc-update the virbr1 has 192.168.18.1 as address, and is reachable via ping from vm guest. but it cant resolve hostnames and cant ping ip´s outside the virtualisation host. anyone knows this effect after update? do i have to change some more things? or is this a bug? any help and hints are welcome thank you marko weber -- zbfmail - Mittendrin statt nur Datei! OpenDKIM, SPF, DSPAM, Greylisting, POSTSCREEN, AMAVIS, Mailgateways Mailfiltering, SMTP Service, Spam Abwehr, MX-Backup, Mailserver Backup Redundante Mailgateways, HA Mailserver, Secure Mailserver

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[libvirt-users] events dispatching in synchronous mode
by Matczak, KrzysztofX 08 Mar '17

08 Mar '17

Hi Is there any way to get events dispatching in synchronous mode ? I mean I'm running my own events polling loop which calls virEventRunDefaultImpl each turn . I'd expect to get my callback function called synchronously , but it's not . Seems that's async call. Maybe it's my general misunderstanding and I shouldn't use virEventRunDefaultImpl for that ? Thanks in advance for any guidance Krzysztof -------------------------------------------------------------- Intel Research and Development Ireland Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.

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[libvirt-users] Cache / IO Setting for qcow2 disks with prealloc=metadata?
by Marko Weber | 8000 08 Mar '17

08 Mar '17

Hello, i´ve done 2 vm with qcow2 disks and created them with qemu-img with prealloc=metadata. Virt-Manager shows me under the performance settings for the Storage, Cache= Hypervisor Default IO= Hypervisor Default Is this the best setting? Or do i choose "native" IO on prealloc=metadata created disks? And do i have to change Cache too? The Virtualisation Host is gento linux, the qcow2 files are stored on a xfs partition, qemu is build with "xfs" Flag. thanks for hints and tipps marko -- zbfmail - Mittendrin statt nur Datei! OpenDKIM, SPF, DSPAM, Greylisting, POSTSCREEN, AMAVIS, Mailgateways Mailfiltering, SMTP Service, Spam Abwehr, MX-Backup, Mailserver Backup Redundante Mailgateways, HA Mailserver, Secure Mailserver

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Re: [libvirt-users] Compile DLL for Windows
by Kartik Vaishnav 08 Mar '17

08 Mar '17

I would like to know if there is a proper documentation for compiling libvirt for Windows. This is in regard to the latest versions of libvirt. Also, most answers are outdated and the scripts by Matthias Bolte on github don't use the latest versions and patches for libvirt. Regards, Kartik Vaishnav

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[libvirt-users] Insert/eject USB
by Leroy Tennison 08 Mar '17

08 Mar '17

Is it possible to insert and eject a USB image in kvm/qemu/libvirt or are the only dynamically changeable devices cdroms and floppies? I've searched the web and I'm either not looking for the right terms or it's obscure. I should mention that I'm not talking about a connecting a physical host USB drive to a guest image, I want to be able to use a qcow image as the source. The context is that I want to be able to revert a VM image back to a prior state (internal snapshot) when testing but be able to retain some data without having to go to the effort of transferring it across the network. I've excluded cdroms as an option because they are read-only (correct me if I'm wrong on this) and require some effort to (re)build. Floppy drives appear to be limited to 1.44M which makes sense but is very limiting. Network mounts (NFS, Samba, etc.) require a server supporting the selected style of filesystem sharing over the network. I'm not sure I want to find out what happens to filesystem passthrough when a revert is done (unless someone knows and it's beneficial). I tried creating a partition associated with the VM but not auto-mounted, even if I unmounted the partition before reverting its state was rolled back. I possibly could get exotic here by setting the immutable attribute after unmounting the partition but, again, I'm hoping for something a little simpler and more straightforward. If there's a workable option I haven't considered I'm open to that. Thanks for any input.

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[libvirt-users] domain reinitalization detection
by Matczak, KrzysztofX 07 Mar '17

07 Mar '17

Hello I'm trying to find out how to detect if domain was destroyed and brought up between two time moments, let's call it reads. So far the best approach I could find is to compare domain ID from previous and current read. And this is my first question : is that reliable solution ? Or do you know any better ? And related question is how to resolve virDomainPtr into domain ID ? The only verified way of getting domain ID I know is to memorize it's UUID, then call virConnectListDomains , then iterate over all returned domain IDs and resolve each one's pointer using virDomainLookupByID , then get UUID by virDomainGetUUIDString get domain ID of matching UUID's . It seems too complex and I expect noticeable performance overhead, so looking for something lighter. I'm trying to get current domain ID using API function : char * virDomainGetMetadata (virDomainPtr domain, int type, const char * uri, unsigned int flags) I'm not sure it's relevant function, since domain ID is contained not in metadata subsection but in opening <domain> markup. In fact I wasn't even able to get any data using that function call since I don't know how to construct valid URI. Do you know any doc or examples explaining that ? Any help appreciated Krzysztof -------------------------------------------------------------- Intel Research and Development Ireland Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.

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[libvirt-users] Bluetooth Device Support
by Max Ehrlich 01 Mar '17

01 Mar '17

Hi, I want to create a virtual hci device on my virtual machine. I have seen that qemu has options supporting this https://qemu.weilnetz.de/doc/qemu-doc.html#Bluetooth_0028R_0029-options and https://qemu.weilnetz.de/doc/qemu-doc.html#pcsys_005fusb Is there any support for these options in libvirt? I was not able to find anything in documentation so I added the qemu command line xml as follows <qemu:commandline> <qemu:arg value='-usbdevice'/> <qemu:arg value='bt:hci'/> <qemu:arg value='-bt'/> <qemu:arg value='hci,host'/> </qemu:commandline> but when I try to run my machine from virt-manager i get the following error: Error starting domain: internal error: process exited while connecting to monitor: 2017-02-28T21:25:51.735987Z qemu-system-x86_64: -device ich9-usb-ehci1,id=usb,bus=pcie.0,addr=0x1d.0x7: PCI: slot 29 function 7 not available for ich9-usb-ehci1, in use by ich9-usb-ehci1 this error does not appear if I remove the commandline xml nodes Does anyone have any guidance for troubleshooting this? If it helps at all, virsh -v gives 2.1.0, virt-manager about page lists 1.3.2 and qemu-system-x86_64 --help gives 2.6.1 I am running Ubuntu 16.10. thanks, Max Ehrlich

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