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[libvirt-users] snapshot-create error
by Hong-Hua.Yin＠freescale.com 10 Jul '14

10 Jul '14

Hi, What's the difference between QEMU snapshot and libvirt snapshot? # qemu-img create -f qcow2 disk.img 512 Formatting 'disk.img', fmt=qcow2 size=512 encryption=off cluster_size=65536 lazy_refcounts=off # qemu-img info disk.img image: disk.img file format: qcow2 virtual size: 512 (512 bytes) disk size: 136K cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false # /usr/bin/qemu-system-ppc -M ppce500 -enable-kvm -m 512 -nographic -kernel /dev/shm/uImage -initrd /dev/shm/ramdisk -append "root=/dev/ram rw console=ttyS0,115200" -serial tcp::4444,server,telnet -snapshot -hda disk.img QEMU 1.7.0 monitor - type 'help' for more information (qemu) QEMU waiting for connection on: telnet:0.0.0.0:4444,server (qemu) savevm (qemu) info snapshot unknown command: 'info snapshot' (qemu) info snapshots ID TAG VM SIZE DATE VM CLOCK 1 vm-20140709035738 173M 2014-07-09 03:57:38 00:00:07.401 Is there any special qemu command options or kernel configurations to allow libvirt create snapshot? I got the error as below: virsh # snapshot-create snap error: unsupported configuration: internal snapshots and checkpoints require all disks to be selected for snapshot The domain XML file is converted as below steps. # cat >snap.args <<EOF /usr/bin/qemu-system-ppc -name snap -M ppce500 -enable-kvm -m 512 -nographic -kernel /dev/shm/uImage -initrd /dev/shm/ramdisk -append "root=/dev/ram rw console=ttyS0,115200" -serial pty # virsh domxml-from-native qemu-argv snap.args >snap.xml # cat sdk.xml <domain type='kvm'> <name>sdk</name> <memory unit='KiB'>524288</memory> <currentMemory unit='KiB'>524288</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='ppc' machine='ppce500'>hvm</type> <kernel>/dev/shm/uImage</kernel> <initrd>/dev/shm/ramdisk</initrd> <cmdline>root=/dev/ram rw console=ttyS0,115200</cmdline> <boot dev='hd'/> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-system-ppc</emulator> <controller type='usb' index='0'/> <controller type='pci' index='0' model='pci-root'/> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </memballoon> </devices> </domain> Best Regards, Olivia

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[libvirt-users] qemu+tls question
by Fl＠sh 09 Jul '14

09 Jul '14

I`m generate TLS-certificates for my libvirtd and remote, useing http://wiki.libvirt.org/page/TLSSetup . >From console connect to remote host is success, but from virt-manager -- no: Unable to connect to libvirt. Unable to read TLS confirmation: Input/output error Verify that the 'libvirtd' daemon is running on the remote host. Libvirt URI is: qemu+tls://<remote_host>/system Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/connection.py", line 1056, in _open_thread self._backend.open (self._do_creds_password) File "/usr/share/virt-manager/virtinst/connection.py", line 158, in open open_flags) File "/usr/lib64/python2.7/site-packages/libvirt.py", line 102, in openAuth if ret is None:raise libvirtError('virConnectOpenAuth () failed') libvirtError: Unable to read TLS confirmation: Input/output error Any suggestions? -- Fl@sh

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[libvirt-users] Disk and Network Statistics for a Specific Interval
by Sijo Jose 09 Jul '14

09 Jul '14

Hi, virDomainInterfaceStats - This function returns network interface stats for interfaces attached to the domain. virDomainBlockStats- This function returns block device (disk) stats for block devices attached to the domain. Based on which time interval these function returns values. Is it cumulative from the vms uptime..? OR average ...? How can I get the average statistics of Disk and Network for a specific time interval say time x to time y ..? Regards -Sijo

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[libvirt-users] memoryStats question
by Gleb Voronich 09 Jul '14

09 Jul '14

Hello, I'm trying to get memory usage statistic inside a guest machine using virDomainMemoryStats function at libvirt. According to http://libvirt.org/html/libvirt-libvirt.html#virDomainMemoryStatTags the structure could have a lot of useful memory statistic but the amount of parameters depends on the hypervisor and the driver. However using KVM I'm able to get VIR_DOMAIN_MEMORY_STAT_ACTUAL_BALLOON and VIR_DOMAIN_MEMORY_STAT_RSS only. Am I right it is not possible to get additional info such as used/unused memory inside a guest machine in case of KVM?

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[libvirt-users] Libvirt 1.2.6 patch for Hyper-V 2012 R2 ?
by Evgeny Vasilchenko 08 Jul '14

08 Jul '14

Hello, Does anyone know if the below patch for libvirt 1.2.4 has been integrated into the libvirt 1.2.6 source code? http://www.redhat.com/archives/libvir-list/2014-May/msg00509.html https://github.com/vikhyath/libvirt-hyperv-r2-2012 Thank you! Evgeny

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[libvirt-users] libvirt behind stunnel4
by Parthipan 08 Jul '14

08 Jul '14

Hi, I'm trying this setup where an stunnel4 (listening for clients on port 16514) connects to an unencrypted libvirt backend (on port 16509). When I point the virsh client to stunnel4 it hangs. Looking via tshark: 1. virsh completes ssl handshake with stunnel4 2. stunnel4 completes tcp handshake with libvirt. and that's all. When connecting virsh client directly to libvirt (this time encrypted) tshark shows: 1. virsh completes ssl handshake with libvirt (change cypher spec at the end) 2. libvirt sends something (I can't decode what libvirt sends, since DH key exchange is used.) Anyway my question really is, can libvirt be run as an unencrypted backend behind an ssl offloader such as stunnel4? If people do use it like that, then I can look for any setup issues in mine. My package versions: libvirt: 1.2.2-0ubuntu13.1 stunnel4: 3:4.53-1.1ubuntu1 Thanks ~parthi

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[libvirt-users] How to get uuid info inside a lxc container created by libvirt_lxc
by Qiang Guan 08 Jul '14

08 Jul '14

Hi , Is there anyway to get uuid info inside a lxc container which is created by libvirt_lxc? For kvm, we can use dmidecode or lshw to get this info inside vm. Is there any tools to do this thing for libvirt lxc? Thanks for any help~ -- ------------ Jackie Best Regards

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[libvirt-users] follow-up to thread : Acces to hypervisor from a KVM guest, ( by the way , how to enter a follow up in a thread ?) Thx
by Jean-Pierre Ribeauville 07 Jul '14

07 Jul '14

Hi, This is what I tried : Y , how enter an answer in the thread ?) virsh -c qemu+ssh://127.0.0.1:22/system hostname root(a)127.0.0.1's<mailto:root@127.0.0.1's> password: error: End of file while reading data: : Input/output error error: failed to connect to the hypervisor In another hand ,as we have few information to share , I was thinking to use a virtio channel to dialog between host and guest . Does it fit ? Thx J.P. ? -----Message d'origine----- De : Eric Blake [mailto:eblake@redhat.com] Envoyé : vendredi 4 juillet 2014 15:20 À : Jean-Pierre Ribeauville; libvirt-users(a)redhat.com<mailto:libvirt-users@redhat.com> Objet : Re: [libvirt-users] Acces to hypervisor from a KVM guest On 07/04/2014 04:23 AM, Jean-Pierre Ribeauville wrote: > Hi, > >>From a KVM guest, I want to retrieve the hostname of the host on which the hypervisor is running. > Before doing that by using libvirt API, I first try via virsh. Well, virsh just uses the libvirt API under the hood. I'd suggest that you try: virsh -c qemu://host/system hostname except that this is a chicken-and-egg situation, because virsh in the guest doesn't know what host to connect to. If you are using the out-of-the-box NAT setup, then you could use qemu://192.168.122.1/system, since your guest will be using an IP address assigned from that subnet from the host. Other than that, libvirt is not really designed for guest-to-host communication, but for host management of guests. You'll have to solve your problem in some other way. Consider the same situation with bare metal hosts - if you are provisioning a cluster, and want machines in the cluster to communicate to a particular controller, but not all machines connect to the same controller, how would you do that? If you can solve that problem, then you can use it to solve your guest provisioning problem. > error: Failed to reconnect to the hypervisor > error: no valid connection > error: internal error Unable to locate libvirtd daemon in /usr/sbin > (to override, set $LIBVIRTD_PATH to the name of the libvirtd binary) This failure is because you did not use -c to connect to a remote daemon, but don't have libvirtd running in the guest. You do not need libvirtd running locally to use virsh for remote connections, but you do need to know where the remote connection lives. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org [cid:image001.png@01CF75CE.35F97F50] Jean-Pierre RIBEAUVILLE Developer Tel: 01 49 11 45 81 Discover Systar's Videos!<https://www.youtube.com/channel/UCvyaJkMXCGFo8_XZYd9rcBw> P Please consider the environment before printing this e-mail

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[libvirt-users] getting CPU usage through virsh command or libvirt API
by Restituto Marcus Arevalo 07 Jul '14

07 Jul '14

Hi, Is it possible to get the CPU usage of a guest through a virsh command? I have tried almost all the commands (vcpuinfo, cpu-stats, etc.) that gets the details of a guest cpu, but it only returns the cpu time. Is there any command that returns the cpu usage (just like the graph that virt-manager displays) of a guest? Or do I have to create a program using libvirt API? Thanks in advance. regards, Marco

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[libvirt-users] qemu-kvm version for CentOS
by kerwin 07 Jul '14

07 Jul '14

WHY CentOS still using qemu-kvm 0.12? What I am need is high version of qemu-kvm for CentOS, but seems like they do not officially provide newest qemu, only qemu 0.12 source code with 3522 patched rpm package. Is there any reasonable to keep low version for qemu-kvm ? or what should I do if I need newest qemu-kvm rpm package? ✉ -- 朴元奎 kerwin

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