April 2016 - Users - libvirt List Archives

[libvirt-users] ceph rbd pool and libvirt manageability (virt-install)
by Jelle de Jong 29 Aug '18

29 Aug '18

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everybody, I created a rbd pool and activated it, but I can't seem to create volumes in it with virsh or virt-install? # virsh pool-dumpxml myrbdpool <pool type='rbd'> <name>myrbdpool</name> <uuid>2d786f7a-2df3-4d79-ae60-1535bcf1c6b5</uuid> <capacity unit='bytes'>6997998301184</capacity> <allocation unit='bytes'>10309227031</allocation> <available unit='bytes'>6977204658176</available> <source> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> <name>libvirt-pool</name> <auth type='ceph' username='libvirt'> <secret uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> </source> </pool> # virt-install --version 1.0.1 # virsh --version 1.2.9 I ended using virsh edit ceph-test.powercraft.nl and making creating the disk manually. <disk type='network' device='disk'> <auth username='libvirt'> <secret type='ceph' uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> <source protocol='rbd' name='libvirt-pool/kvm01-storage'> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> </source> <target dev='vdc' bus='virtio'/> </disk> I use virt-install a lot to define, import and undefine domains, how can I use virt-install to manage my rdb disks? Kind regards, Jelle de Jong -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iJwEAQECAAYFAlV1xlQACgkQ1WclBW9j5HkbPQP+PjNrzvlqysslOp2Yk7wH4Mxy 2sh2dn96G0KOAHEeEn3BN6IWlnD1TADZbHdpTtMwkdv48Xwn0sP1s+3QDM4pb3gP n+z+dVxS8FouDIy/eiso3IBCj3g4TWbEX8ZHqs3jKqe0lZgAXBzB9xYSUowcEBrZ ddkPbr8p8ozWyOG+9V8= =lkK7 -----END PGP SIGNATURE-----

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[libvirt-users] virRandomBits - not very random
by Brian Rak 01 Jun '18

01 Jun '18

I just ran into an issue where I had about 30 guests get duplicate mac addresses assigned. These were scattered across 30 different machines. Some debugging revealed that: 1) All the host machines were restarted within a couple seconds of each other 2) All the host machines had fairly similar libvirtd pids (within ~100 PIDs of each other) 3) Libvirt seeds the RNG using 'time(NULL) ^ getpid()' This perfectly explains why I saw so many duplicate mac addresses. Why is the RNG seed such a predictable value? Surely there has to be a better source of a random seed then the timestamp and the pid? The PID seems to me to be a very bad source of any randomness. I just ran a test across 60 of our hosts. 43 of them shared their PID with at least one other machine.

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[libvirt-users] stream finish throws exception via python API
by Shahar Havivi 28 Nov '16

28 Nov '16

Hi, The following snippet works fine e.g. receiving the data but when calling stream.finish() we get the following error: stream = con.newStream() vol.download(stream, 0, 0, 0) buf = stream.recv(1024) stream.finish() libvirt: I/O Stream Utils error : internal error: I/O helper exited abnormally Traceback (most recent call last): File "./helpers/kvm2ovirt", line 149, in <module> download_volume(vol, item[1], diskno, disksitems, pksize) File "./helpers/kvm2ovirt", line 102, in download_volume stream.finish() File "/usr/lib64/python2.7/site-packages/libvirt.py", line 5501, in finish if ret == -1: raise libvirtError ('virStreamFinish() failed') libvirt.libvirtError: internal error: I/O helper exited abnormally Am I doing something wrong? Thank you, Shahar.

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[libvirt-users] unhelpful error message on failed "virsh migrate"
by Andreas Buschmann 01 Jun '16

01 Jun '16

Hello, I have two servers where I can push VMs from one to the other by issuing the command virsh migrate --live --persistent --copy-storage-all --verbose \ test6 qemu+ssh://kvmhost2/system on kvmhost1. I can get the VM back by issuing the equivalent command on kvmhost2: virsh migrate --live --persistent --copy-storage-all --verbose \ test6 qemu+ssh://kvmhost1/system After an update (on behalf of the glibc bug) it only works for some VMs and fails for others. The error message is unhelpful: virsh --debug 4 migrate --live --persistent --copy-storage-all --verbose \ vmware-mgmt qemu+ssh://kvmhost1/system error: internal error: info migration reply was missing return status Is there a way to get a more helpful error message? migrating VMs only works for a very limited subset of the VMs on the system in the direction kvmhost2 --> kvmhost2 Stopping the VMs, copying them over to kvmhost1 and restarting still works, and I can even migrate them back. How do I debug this problem? One possible way would be to stop all VMs on kvmhost2, manually copy them to kvmhost1 and start them and afterwards reinstall all packages (or the whole Server if that doesn't help) But that would be a workaround, and I still would not know what the problem is. The system is CentOS 7.2 now and was CentOS 7.1 before the upgrade, with the qemu-kvm-rhev repo added for qemu. Mit freundlichen Gruessen Andreas Buschmann -- Andreas Buschmann [Senior Systems Engineer] net.DE AG

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[libvirt-users] I have ping through bridge , net has been started , But IPs they're not equivalent.
by Mohsen Pahlevanzadeh 30 Apr '16

30 Apr '16

Dear All, I have the following configuration and I have ping from bridge : ///////////////////////////////////////////////////// iface eth0 inet static address 192.168.1.4 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 auto ivbr0 iface ivbr0 inet static address 192.168.1.4 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 bridge_ports eth0 bridge_stp on bridge_maxwait 0 bridge_fd 0 ///////////////////////////////////////////// # brctl show bridge name bridge id STP enabled interfaces ivbr0 8000.18037360b44e yes eth0 ///////////////////////////////////////////// my network xml file : <network> <name>myintranet</name> <uuid>465ce6cb-0a69-4f89-92ba-629349741e73</uuid> <forward mode='nat'> <interface dev="eth0" /> </forward> <bridge name='ivbr0' stp='on' delay='0' /> <mac address='52:54:00:0f:f4:f0'/> <ip address='192.168.1.4' netmask='255.255.255.0'> <dhcp> <range start='192.168.1.3' end='192.168.122.254'/> </dhcp> </ip> </network> //////////////////////////////////////////// Now , I have ping of my modem and internet. Then I did the following command : # ip l set dev ivbr0 down # brctl delbr ivbr0 # virsh net-start myintranet Network myintranet started According to above , myintranet network has been started. But with the following IP address : # ip a show dev ivbr0 17: ivbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/ether 52:54:00:0f:f4:f0 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global ivbr0 valid_lft forever preferred_lft forever //////// 192.168.122.1 ? Question is , Where I change this address?(I set in myxml file.) --best regards Mohsen

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[libvirt-users] virsh and disable interface
by Mohsen Pahlevanzadeh 30 Apr '16

30 Apr '16

Dear All, According to http://wiki.libvirt.org/page/Networking#Debian.2FUbuntu_Bridging May be I have to do "ifdown eth0" How can I define, edit or other task live? ---mohsen

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[libvirt-users] vhost-user libvirt 1.2.18 issue
by chintu hetam 29 Apr '16

29 Apr '16

Hello there, i am trying to start my VM with 2 virtio interfaces as a vhost-user interface Following is my relevant xml network configuration " <interface type='vhostuser'> <mac address='52:54:00:c7:ac:38'/> <source type='unix' path='/tmp/vhost1.sock' mode='server'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </interface> <interface type='vhostuser'> <mac address='52:54:00:9d:ea:73'/> <source type='unix' path='/tmp/vhost2.sock' mode='server'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/> </interface>" when i execute virsh start domain_name command it starts and gets paused log shows it's stuck at n-pci,id=balloon0,bus=pci.0,addr=0x7 -msg timestamp=on QEMU waiting for connection on: disconnected:unix:/tmp/vhost1.sock,server is there anything i am missing? thank you in advance. -hardik-

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[libvirt-users] Use virt-* tools from within container?
by Ken D'Ambrosio 28 Apr '16

28 Apr '16

Hi, all. I've set up an LXC container for various Openstack admin chores, and now I'm being asked to have it used for importing qcow2 images -- on which we want to run utilities like virt-sparsify and virt-sysprep, first. Sadly, when I do that, it dies horribly, e.g., root@openstack-cli:/tmp# virt-sysprep -a cloud-image.qcow2 Examining the guest ... libguestfs: warning: supermin-helper -f checksum returned a short string Fatal error: exception Guestfs.Error("cannot find any suitable libguestfs supermin, fixed or old-style appliance on LIBGUESTFS_PATH (search path: /usr/lib/guestfs)") Is there a way around this? Or is the answer, "Don't do that in a container"? Thanks! -Ken P.S. /usr/lib/guestfs -- the only part of the error I can easily look into -- has more stuff in it than the system that does process virt-* commands properly. Here's what's there: excludelist make.sh packagelist supermin.d

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[libvirt-users] Networking issues with lxc containers in AWS EC2
by Peter Steele 27 Apr '16

27 Apr '16

I've created an EC2 AMI for AWS that essentially represents a CentOS 7 "hypervisor" image. I deploy instances of these in AWS and create an number of libvirt based lxc containers on each of these instances. The containers run fine within a single host and have no problem communicating with themselves as well as with their host, and vice versa. However, containers hosted in one EC2 instance cannot communicate with containers hosted in another EC2 instance. We've tried various tweaks with our Amazon VPC but have been unable to find a way to solve this networking issue. If I use something like VMware or KVM and create VMs using this same hypervisor image, the containers running under these VMs can communicate with with each other, even across different hosts. My real question is has anyone tried deploying EC2 images that host containers and have figured out how to successfully communicate between containers on different hosts? Peter

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[libvirt-users] /proc/meminfo
by Peter Steele 27 Apr '16

27 Apr '16

Has anyone seen this issue? We're running containers under CentOS 7.2 and some of these containers are reporting incorrect memory allocation in /proc/meminfo. The output below comes from a system with 32G of memory and 84GB of swap. The values reported are completely wrong. # cat /proc/meminfo MemTotal: 9007199254740991 kB MemFree: 9007199224543267 kB MemAvailable: 12985680 kB Buffers: 0 kB Cached: 119744 kB SwapCached: 10804 kB Active: 110228 kB Inactive: 111716 kB Active(anon): 53840 kB Inactive(anon): 57568 kB Active(file): 56388 kB Inactive(file): 54148 kB Unevictable: 0 kB Mlocked: 15347728 kB SwapTotal: 0 kB SwapFree: 18446744073709524600 kB Dirty: 20304 kB Writeback: 99596 kB AnonPages: 18963368 kB Mapped: 231472 kB Shmem: 51852 kB Slab: 1891324 kB SReclaimable: 1805244 kB SUnreclaim: 86080 kB KernelStack: 60656 kB PageTables: 81948 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 104487760 kB Committed_AS: 31507444 kB VmallocTotal: 34359738367 kB VmallocUsed: 354796 kB VmallocChunk: 34359380456 kAnonHugePages: 15630336 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 81684 kB DirectMap2M: 3031040 kB DirectMap1G: 32505856 kB

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[libvirt-users] Managing VMs across multiple physical hosts
by Daniel Corbe 26 Apr '16

26 Apr '16

Hello List, We’re currently managing VMs across approximately 26 physical hosts. We tend to migrate VMs around a lot to do things like spread load and keep VMs running when physical hosts are in need of package updates. Suffice it to say sometimes finding out which physical host a VM is currently running on can be a pain. Anyone know of an open source tool that will give me a snapshot of what’s running where across a list of physical hosts? Doesn’t have to be anything fancy. A command-line utility will do. Best, Daniel

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[libvirt-users] VM crash : Failed to terminate process X with SIGKILL: Device or resource busy
by Michel Villeneuve 23 Apr '16

23 Apr '16

Hello since I changed my hypervisor from centos 6.3 to Fedora-23 I had many problems with differents VMs. Very often once by day ( I have about 150 VM ), some VMs crash or freeze indifferently and I got messages like this on console. [<fffffffff8000a08bd>] wake_bit_funtion +0w0/0x23..... [<fffffffff8800a0ead>] :jbd:journal_get_write_access+0x22/0x33 ;;;; [<fffffffff800013ccd>] :ext3:ext3_dirty_inode+0x63/0x7b And so the VM is crashed and can't be accessed but often the ping command can respond Before my migration I never meet these problems, It 's strictly the same VMs between the 6.3 and fedora23 release. I just changed the parameter : <type arch='x86_64' machine='rhel-6.0.0'>hvm</type> to <type arch='x86_64' machine='pc-i440fx-2.4'>hvm</type> and do a virsh define I tried some other version of the parameters without success. and I also added a lockd manager in fedora23. Before and I used libvirt.0.9.5 or 1.0.2 on centos 6.03 without lockd A major problem with these crashs is that the VMs couldn't be destroyed by the virsh command, the qemu process is notified as defunct by the ps command If I try a virsh destroy I get in log file 2016-04-20 20:32:47.318+0000: 5541: info : virEventPollRunOnce:641 : EVENT_POLL_RUN: nhandles=11 timeout=-1 2016-04-20 20:32:55.028+0000: 5567: debug : virProcessKillPainfully:368 : Timed out waiting after SIGTERM to process 8720, sending SIGKILL 2016-04-20 20:33:00.032+0000: 5567: error : virProcessKillPainfully:398 : Failed to terminate process 8720 with SIGKILL: Périphérique ou ressource occupé or on console Failed to terminate process xxx with SIGTERM: Device or resource busy and the VM is still in the list in a "Stopping" state Result of ps ps on the the qemu process attached to the VM qemu 8720 1 0 avril20 ? 00:07:16 [qemu-system-x86] <defunct> root 8733 2 0 avril20 ? 00:00:01 [vhost-8720] root 8735 2 0 avril20 ? 00:00:00 [kvm-pit/8720] libvirtd seems to be in an anormal state. If I restart the libvirtd the virsh command just hang and never remove the VM from the list. The only seems to reboot the hypervisor but all the VMs in production too. Is there a way to remove the process qemu in defunct state without reboot the hypervisor. Perhaps the probleme come from the VM parameters which have been created on 6.3 Centos and libvirt <1.0 version. Do I need to convert some other parameters ? I 'am trying to put a new hypervisor in aFailed to terminate process X with SIGKILL: Device or resource busy version level less than fedora23 perhaps a Centos 7.2 to see what 's happen and if there is a problem like mine. Thanks PS: I put the log_level to 1 ----------------------information in logfile [root@kvmserver6 ~]# ls -al /var/lib/libvirt/qemu/domain-1-TEST-VM-A total 8 drwxr-x--- 2 qemu qemu 4096 20 avril 22:01 . drwxr-x--x. 18 qemu qemu 4096 20 avril 22:01 .. srwxrwxr-x 1 qemu qemu 0 20 avril 22:01 monitor.sock /var/lib/libvirt/qemu/channel/target/domain-1-TEST-VM-A/ [root@kvmserver6 ~]# cat /var/log/libvirt/qemu/TEST-VM-A.log 2016-04-20 20:01:36.714+0000: starting up libvirt version: 1.3.3, package: 1.fc23 (Unknown, 2016-04-06-15:17:39, thinkpad2), qemu version: 2.4.1 (qemu-2.4.1-8.fc23), hostname: kvmserver6.univ-brest.fr LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-kvm -name TEST-VM-A,debug-threads=on -S -machine pc-i440fx-2.4,accel=kvm,usb=off -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 1e4c27e4-123e-719a-9fdf-f783d34cbb40 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-1-TEST-VM-A/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/POOL_PROD4/TEST-VM-A.img,format=raw,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,id=drive-ide0-1-0,readonly=on -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=26,id=hostnet0,vhost=on,vhostfd=28 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:77:11:11,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 0.0.0.0:0,password -k fr -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device ES1370,id=sound0,bus=pci.0,addr=0x4 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -msg timestamp=on char device redirected to /dev/pts/1 (label charserial0) qemu: terminating on signal 15 from pid 5541 -- Michel Villeneuve Tel 02 98 01 71 61

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[libvirt-users] Mapping physical interface to a container
by Peter Steele 22 Apr '16

22 Apr '16

In the "other" LXC project (linuxcontainers.org) you can map a host's physical ethernet interface to a container, e.g. lxc.network.type = phys lxc.network.flags = up lxc.network.link = eth1 lxc.network.name = eth1 Is there an equivalent option for doing this with libvirt lxc? Peter

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[libvirt-users] uefi built from tiancore via edk2 can't persist boot changes
by jsl6uy js16uy 21 Apr '16

21 Apr '16

Apologies if this has been gone over, but I believe I have checked the intertubes more than a bit..... I am using libvirt and have vms booting under an OVMF.fd to use an efi firmware. I can create vms, linux ubuntu, and they will boot up. However, everytime I reboot am I dropped into the default efi shell provide by the tianocore build. Then I must walk the FS to the booting efi app and run, in this case grubx64.efi, to actually finish booting the host. I had tried adding boot entries with efibootmgr within the OS and also bcfg with the efi shell. I get no errors when adding an entry, and the new entry shows up and I can manipulate the entry i.e. set it to next boot and the like. Soon as I reboot I get dumped back to efi shell. Am I missing something? Are the var changes not being stored? Is there someplace to look for an error perhaps? I also can use the same efi bootloader under libvirt to boot a hybrid iso. location of the efi application on the hybrid iso is /EFI/boot/bootx64.efi. Drops me right into my grub menu, after falling thru from EFI FLOPPY1 and EFI FLOPPY2 to EFI DVD So since that was/is working, tried adding that to my efi partition so it has /EFI/boot/bootx64.efi. The thinking being that since I can't add an entry, I will setup for the "known" efi boot path. Of course that didn't work either I am on arch linux: Linux X 4.4.5-1-ARCH #1 SMP PREEMPT Thu Mar 10 07:38:19 CET 2016 x86_64 GNU/Linux local/libvirt 1.3.2-3 API for controlling virtualization engines (openvz,kvm,qemu,virtualbox,xen,etc) local/libvirt-python 1.3.1-1 libvirt python binding UEFI: Shell> ver UEFI Interactive Shell v2.1 EDK II UEFI v2.50 (EDK II, 0x00010000) for this host....my nvram setting look like <os> <type arch='x86_64' machine='pc-i440fx-2.5'>hvm</type> <loader readonly='yes' type='pflash'>/home/xyz/OVMF.fd</loader> <nvram template='/usr/share/OVMF/OVMF_VARS.fd'>/var/lib/libvirt/qemu/nvram/X_VARS.fd</nvram> <boot dev='hd'/> </os>

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[libvirt-users] ssh-askpass in libvirt
by Alex Roithman 20 Apr '16

20 Apr '16

It seems, that libvirt use system environments for finding the ask-pass application. You can to tell me this variables? Or libvirt uses another mechanism for call to ssh-askpass application?

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[libvirt-users] Create multiple domains from single saved domain state (is UUID/name fixed?)
by Jonas Finnemann Jensen 20 Apr '16

20 Apr '16

Hi, I would like to save a running domain (ie. disk + memory) and be able to restore it multiple times creating duplicates of the orignal domain all starting from the same state. Use case: I'm building a task-processing system for use in a CI flow. I want to run multiple VMs in parallel using the same image (always starting from the same state). And to avoid needlessly booting between each task, I would like to save (and distribute) the domain state, so that I just restore from memory. However, I can't seems to change the UUID or the name of a domain once it is saved. Nor do I seem able to rename a domain while it is running. I can obviously duplicate both the disks and the file to which I saved the domain state using "virsh save". But I seem unable to rename before I restore.. Any ideas? Could I do this with snapshots? I suspect not since I see virDomainSnapshotRedefinePrep() calling virDomainDefCheckABIStability which raises the error here: https://fossies.org/dox/libvirt-1.3.3/domain__conf_8c_source.html#l17991 Out of curiosity does anyone know what horrors might befall me if I were to remove the lines protecting against name and UUID changes? Then compile my own libvirt... The comment in the code says name can be changed, but I'm guessing I would have to change the UUID too. Does anyone see how that would create issues? I'm not sure how libvirt uses the UUID internally. -- Regards Jonas Finnemann Jensen.

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[libvirt-users] this function is not supported by the connection driver: virDomainCoreDump
by Alex Font 19 Apr '16

19 Apr '16

Hi, I'm facing problems trying to get a full dump of a VM machine on ESXi 6.0, using libvirt 1.3.3. When I try to do: virsh$: dump vm_machine dump.dmp I get the following error: this function is not supported by the connection driver: virDomainCoreDump Is there any way to get dumps of VM's? Thanks in advance. Alex

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[libvirt-users] Make disk "unaffected by snapshots"
by Basin Ilya 17 Apr '16

17 Apr '16

Hi. Is it possible to make a virtual disk unaffected by snapshots just like writethrough disks in VBox? I tried raw with shareable flag, but snapshot creation fails with: "internal snapshot for disk vdb unsupported for storage type raw".

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[libvirt-users] Can libvird use iSCSI direcly?
by Basin Ilya 16 Apr '16

16 Apr '16

Hi. I was expecting that qemu-kvm process would connect directly to iSCSI server, but https://libvirt.org/storage.html#StorageBackendISCSI says that it wants symlinks in `/dev/disk/by-path` . That suggests it relies on Linux iSCSI client that will act as mediator and create block devices. So is "iSCSI volume pools" just a convenience thing giving no performance gain compared to attaching block devices to my guest?

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[libvirt-users] locked out after preseed install
by Mario Gummies 15 Apr '16

15 Apr '16

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[libvirt-users] How to optimize for IBM db2?
by Basin Ilya 15 Apr '16

15 Apr '16

Hi. I have performance problems with IBM DB2 10.5 server on KVM guest: [db2inst1@wc8ws-auth ~]$ time db2 create db test DB20000I The CREATE DATABASE command completed successfully. real 7m46.155s user 0m0.022s sys 0m0.027s It takes 30 seconds to create a database on an image mounted with -oloop. I think it's because db2 uses O_DIRECT to ensure consistency. I also think that O_DIRECT is not propagated to host with default cache modes in VM settings. The real problem is: when guest writes data in small blocks, host CPU becomes a bottleneck. I hava a relatively old 24-core Xeon. Host `top` shows 130% CPU usage by qemu-kvm, when I run the following command: [root@wc8ws-auth ~]# </dev/zero timeout -sINT 30s dd iflag=fullblock oflag=direct conv=notrunc of=./bigfile bs=8192 140384+0 records in 140384+0 records out 1150025728 bytes (1.2 GB) copied, 29.9992 s, 38.3 MB/s I tried all buses, cache modes and IO modes; "Cache mode=none" is slower, others are almost equal. I moved from image file to LVM. This raised the speed from 16M to 38M. I also tried VirtualBox, but it's neither faster, nor slower, and it eats CPU too. -- -------------------------------------------------------------------------------- Kind regards, Ilya Basin software engineer Reksoft Skype: basin_ilya phone +7(812)324-24-40*553

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[libvirt-users] how to list and kill existing console sessions to VMs?
by Francesco Romani 14 Apr '16

14 Apr '16

Hi everyone, If a VM is configured to have a console attached to it, like using http://libvirt.org/formatdomain.html#elementCharConsole Libvirt offers access to VM serial console's using the virDomainOpenConsole API[1] However, I didn't find a way to 1. list the existing connections to the console 2. kill an existing connection - without reconnecting using VIR_DOMAIN_CONSOLE_FORCE[2] Am I missing something? How can I do that? Rationale for my request oVirt [3] offers a management interface for VMs, and we have recently integrated user-friandly VM serial console access [4] in the system; in the future release we want to enhance the administation capabilities allowing to check existing connections and to terminate them (maybe because it got stuck). +++ [1] http://libvirt.org/html/libvirt-libvirt-domain.html#virDomainOpenConsole [2] http://libvirt.org/html/libvirt-libvirt-domain.html#VIR_DOMAIN_CONSOLE_FORCE [4] http://www.ovirt.org/ [5] https://www.ovirt.org/develop/release-management/features/engine/serial-con… et. al. -- Francesco Romani RedHat Engineering Virtualization R & D Phone: 8261328 IRC: fromani

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[libvirt-users] DBus API for libvirt
by sbaugh＠catern.com 14 Apr '16

14 Apr '16

Hello, For a variety of reasons I am interested in a D-Bus interface for libvirt. Primarily for use with http://cockpit-project.org/ for which it would be very easy to write a web interface for libvirt, given a D-Bus interface for libvirt, but writing using the raw libvirt RPC protocol would require writing a new Javascript library for parsing/encoding that protocol. But there are other nice features of a D-Bus interface for libvirt, too. Does a D-Bus interface for libvirt exist? Thanks!

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[libvirt-users] Clone VM with saved state
by Michael Ravits 13 Apr '16

13 Apr '16

Hi, My use case involves creating duplicates of saved virtual machines. Tried with virt-manager and with virsh but so far it seems like this case is not supported by these tools. Does anyone know how I could achieve the above? Thanks, Michael

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Re: [libvirt-users] [Bug 1325687] network type="ethernet" not supported with LXC
by abhishek jain 13 Apr '16

13 Apr '16

Hi Team I'm trying to launch LXC VM with libvirt 1.2.12 having commit *22cff52a2b8e06c913b1f97767e5d3**90fb17fc3b *with below XML configuration.. <domain type="lxc"> <uuid>64c48da2-e318-4085-8b88-c980aab4de34</uuid> <name>test</name> <memory>524288</memory> <vcpu>1</vcpu> <os> <type machine="virt">exe</type> <cmdline>root=/dev/ram0 rw console=ttyAMA0 rootwait earlyprintk</cmdline> <init>/bin/sh</init> </os> <clock offset="utc"/> <devices> <file/> <interface type='ethernet'> <mac address='02:74:ff:9d:52:f5'/> <script path=''/> <target dev='tap74f2-f5'/> </interface> <console type="pty"/> </devices> </domain> I'm getting following errors while launching LXC VM using above XML file.. virsh -c lxc: define lxc.xml virsh -c lxc: start test error: Failed to start domain test error: internal error: guest failed to start: /usr/lib/libvirt/libvirt_lxc: option '--veth' requires an argument syntax: /usr/lib/libvirt/libvirt_lxc [OPTIONS] Options -b, --background -n NAME, --name NAME -c FD, --console FD -v VETH, --veth VETH -s FD, --handshakefd FD -S NAME, --security NAME -h, --help Unknown failure in libvirt_lxc startup Please help me regarding this. --Thanks Abhishek Jain On Mon, Apr 11, 2016 at 3:35 AM, <bugzilla(a)redhat.com> wrote: > https://bugzilla.redhat.com/show_bug.cgi?id=1325687 > > Cole Robinson <crobinso(a)redhat.com> changed: > > What |Removed |Added > > ---------------------------------------------------------------------------- > Status|NEW |CLOSED > CC| |crobinso(a)redhat.com > Resolution|--- |CURRENTRELEASE > Last Closed| |2016-04-10 18:05:06 > > > > --- Comment #1 from Cole Robinson <crobinso(a)redhat.com> --- > ethernet support was actually enabled for lxc via this commit: > > commit 22cff52a2b8e06c913b1f97767e5d390fb17fc3b > Author: Anirban Chakraborty <abchak(a)juniper.net> > Date: Tue Nov 18 15:55:48 2014 -0800 > > network: Add network bandwidth support to ethernet interfaces > > > Which looks like libvirt v1.2.10 or v1.2.11 > > -- > You are receiving this mail because: > You are on the CC list for the bug. > You reported the bug.

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