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[libvirt-users] Virsh blkstat doesn't work on Xen HVM
by wenche_chang＠trend.com.tw 03 Jun '10

03 Jun '10

Hi I tried to use virsh blkstat to get information of a block, but it returns an error message as shown below This function works fine in KVM, but fail in XEN. I tried XEN 3.4.3 ,4.0.0 and 4.0.1 with libvirt 0.7.1 from fedora yum server and 0.8.1 from libvirt . All of them are fail to get the block status. The following is the config file and error message of virsh domblkstat. Any one knows how to make this function work? [root@localhost ~]# virsh dumpxml vm1 <domain type='xen' id='1'> <name>vm1</name> <uuid>12af1ed4-2f2d-f02d-9a2a-5d4f377889d5</uuid> <memory>524288</memory> <currentMemory>524288</currentMemory> <vcpu>1</vcpu> <os> <type>hvm</type> <loader>/usr/lib/xen/boot/hvmloader</loader> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/lib64/xen/bin/qemu-dm</emulator> <disk type='file' device='disk'> <driver name='file'/> <source file='/var/lib/libvirt/images/vm1.img'/> <target dev='hda' bus='ide'/> </disk> <disk type='file' device='cdrom'> <target dev='hdc' bus='ide'/> <readonly/> </disk> <interface type='bridge'> <mac address='00:16:36:0f:fb:7a'/> <source bridge='eth0'/> <script path='/etc/xen/scripts/vif-bridge'/> <target dev='vif1.0'/> </interface> <serial type='pty'> <source path='/dev/pts/0'/> <target port='0'/> </serial> <console type='pty' tty='/dev/pts/0'> <source path='/dev/pts/0'/> <target port='0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5900' autoport='yes' keymap='en-us'/> <sound model='es1370'/> </devices> </domain> [root@localhost ~]# virsh domblkstat vm1 hda error: Failed to get block stats vm1 hda error: internal error read_bd_stats: Failed to read any block statistics TREND MICRO EMAIL NOTICE The information contained in this email and any attachments is confidential and may be subject to copyright or other intellectual property protection. If you are not the intended recipient, you are not authorized to use or disclose this information, and we request that you notify us by reply mail or telephone and delete the original message from your mail system. TREND MICRO EMAIL NOTICE The information contained in this email and any attachments is confidential and may be subject to copyright or other intellectual property protection. If you are not the intended recipient, you are not authorized to use or disclose this information, and we request that you notify us by reply mail or telephone and delete the original message from your mail system.

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[libvirt-users] JSON support
by Camilo Aguilar 03 Jun '10

03 Jun '10

Are there any efforts to support JSON in libvirt ?

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[libvirt-users] Working example of logical storage pool and volume creation?
by Justin Clift 03 Jun '10

03 Jun '10

Hi all, Does anyone have a working example of creation of a logical storage pool and volume? I'm hitting a wall getting logical volumes to work on RHEL 6 beta. There's a single drive I'm trying to setup (sdc) as a libvirt managed logical storage pool, but all volume creation on it fails. Here's what I'm finding so far: Prior to any storage pool work, only the host boot drive (sda) is in lvm. # vgs VG #PV #LV #SN Attr VSize VFree vg_host2 1 3 0 wz--n- 465.27g 0 # pvs PV VG Fmt Attr PSize PFree /dev/sda2 vg_host2 lvm2 a- 465.27g 0 # ls -la /dev/mapper total 0 drwxr-xr-x. 2 root root 120 Jun 1 03:12 . drwxrwxrwt. 21 root root 3920 Jun 1 03:12 .. crw-rw----. 1 root root 10, 58 May 31 14:08 control lrwxrwxrwx. 1 root root 7 May 31 14:10 vg_host2-lv_home -> ../dm-7 lrwxrwxrwx. 1 root root 7 May 31 14:08 vg_host2-lv_root -> ../dm-0 lrwxrwxrwx. 1 root root 7 May 31 14:10 vg_host2-lv_swap -> ../dm-8 # Creation of a logical storage pool, using sdc: # virsh pool-define-as guest_images_lvm logical - - /dev/sdc libvirt_lvm /dev/mapper Pool guest_images_lvm defined # virsh pool-info guest_images_lvm Name: guest_images_lvm UUID: 17398035-8000-7252-ab25-58db95aed130 State: inactive # virsh pool-build guest_images_lvm Pool guest_images_lvm built # The physical device and volume group are seen in lvm: # pvs PV VG Fmt Attr PSize PFree /dev/sda2 vg_host2 lvm2 a- 465.27g 0 /dev/sdc libvirt_lvm lvm2 a- 465.76g 465.76g # vgs VG #PV #LV #SN Attr VSize VFree libvirt_lvm 1 0 0 wz--n- 465.76g 465.76g vg_host2 1 3 0 wz--n- 465.27g 0 # Starting the logical pool works: # virsh pool-start guest_images_lvm Pool guest_images_lvm started # Creation of volumes fail: # virsh vol-create-as guest_images_lvm volume1 8G error: Failed to create vol volume1 error: internal error '/sbin/lvcreate --name volume1 -L 8388608K /dev/mapper' exited with non-zero status 3 and signal 0: Volume group name expected (no slash) Run `lvcreate --help' for more information. # So, it looked like "/dev/mapper" in the pool-define-as command should have instead been the LVM volume group again. That doesn't work either though: # virsh pool-define-as guest_images_lvm logical - - /dev/sdc libvirt_lvm libvirt_lvm Pool guest_images_lvm defined # virsh pool-build guest_images_lvm Pool guest_images_lvm built # virsh pool-start guest_images_lvm Pool guest_images_lvm started # virsh vol-create-as guest_images_lvm volume1 8G error: Failed to create vol volume1 error: cannot read path 'libvirt_lvm/volume1': No such file or directory Looking in the libvirtd logs for this last attempt, the volume was actually successfully created. But libvirtd then checks for it's presence (wrongly!), doesn't find it, and then lvremove's it: 03:01:24.000: debug : virRunWithHook:832 : /sbin/lvcreate --name volume1 -L 8388608K libvirt_lvm ... 03:01:24.223: debug : virRunWithHook:848 : Command stdout: Logical volume "volume1" created ... 03:01:24.223: error : virStorageBackendLogicalCreateVol:616 : cannot read path 'libvirt_lvm/volume1': No such file or directory ... 03:01:24.223: debug : virRunWithHook:832 : /sbin/lvremove -f libvirt_lvm/volume1 Guessing I'm either doing something wrong, or hitting bugs, or ? Anyone have ideas/suggestions/etc? Regards and best wishes, Justin Clift -- Salasaga - Open Source eLearning IDE http://www.salasaga.org

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[libvirt-users] Mount options for fs type storage pools?
by Justin Clift 03 Jun '10

03 Jun '10

Hi all, Presently writing up "Storage Pool" docs for the Fedora Virtualisation Guide. (using both virsh and virt-manager) Having trouble finding out how to specify mount options for fs type storage pools. For example: # virsh pool-define-as guest_images_fs fs - - /dev/sdc1 - "/guest_images" Pool guest_images_fs defined # virsh pool-build guest_images_fs Pool guest_images_fs built # virsh pool-start guest_images_fs Pool guest_images_fs started # mount | grep guest_images /dev/sdc1 on /guest_images type ext4 (rw) # Notice that /guest_images is mounted with default options. Nothing wrong with that, but lets say the SysAdmin has a need to pass specific mount options. (ie journal_checksum, or noatime, or nodiratime, etc) Checked the virStorageBackendFileSystemMount() function in present git master, and it doesn't look like mount options are considered for anything other than Gluster? How to do it, or is it best to not use libvirt to manage the mounting of this type of storage when options are needed? Regards and best wishes, Justin Clift -- Salasaga - Open Source eLearning IDE http://www.salasaga.org

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[libvirt-users] Host should not touch passed-through USB device, how?
by Andreas Ntaflos 02 Jun '10

02 Jun '10

Hello list, this may be off topic but it is closely related to my Libvirt adventures so maybe you can help me. I want to pass a USB device (a USB Huawei E620 modem) through to a KVM guest. Pass-through in general works fine and the modem is visible in the guest. However, the host still sees it and sometimes tries to access it (such modems seem to also be USB storage devices). This naturally leads to conflicts and I believe this crashed the guest very badly yesterday. So I am looking for a way to make sure the host passes through the USB device (in its entirety) without trying to touch it and claim it as its own. Preferably without disabling the USB storage subsystem completely on the host. Any ideas? Is there a best practice for such things in the Libvirt world? Or any other world? Thanks! Andreas -- Andreas Ntaflos GPG Fingerprint: 6234 2E8E 5C81 C6CB E5EC 7E65 397C E2A8 090C A9B4

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[libvirt-users] Qemu driver not supporting VIR_DOMAIN_DEVICE_MODIFY_CONFIG yet?
by Guido Winkelmann 02 Jun '10

02 Jun '10

Hi, According to the docs on http://libvirt.org/html/libvirt-libvirt.html#virDomainDetachDeviceFlags I ought to be able to do virDomainDetachDeviceFlags( <domain>, <devicexml>, VIR_DOMAIN_DEVICE_MODIFY_LIVE | VIR_DOMAIN_DEVICE_MODIFY_CONFIG); to detach a volume both from a currently running VM instance and permanently from the defined config file. If I actually try that, though, I'm getting this error: libvir: QEMU error : Requested operation is not valid: cannot modify the persistent configuration of a domain The same thing happens whether or not the domain is running and also happens if I leave out the "VIR_DOMAIN_DEVICE_MODIFY_LIVE" part. Does the qemu driver simply not support VIR_DOMAIN_DEVICE_MODIFY_CONFIG yet (libvirt 0.8.1), or is there some other problem here? Guido

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[libvirt-users] Monitoring KVM Machine Uptimes
by Karsten Knese 02 Jun '10

02 Jun '10

Hey folks. Currently, I am working on an accounting-solution for Private Cloud with Eucalyptus as my bachelor-thesis. Eucalyptus bases on libvirt providing the KVM machines. Part of the thesis is kind of measurement for the uptimes of each instance in the cloud. As Eucalyptus is based on libvirt, i want to know if there is kind of tool already setup for monitoring a vm in terms of uptimes, cputimes and disk i/o. If not, can anyone give me a hint, how i could grep these facts? I found a tool called "virt-top" which monitors the vm, but for me there is to much overhead. Thanks for you support. cheers, Karsten

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[libvirt-users] FailOver IP
by Christian Hermann 02 Jun '10

02 Jun '10

hi guys! i`am new to libvirt and i want using kvm with a ipv4 failover ip-address. so this addres has the netmask 255.255.255.255. this ip is directly bind to my root server by my provider. so i can not use it on an other server. can you tell me how i can use this ip address on a kvm virtual maschine, build with libvirt? Kind regards, Chris

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[libvirt-users] ballooning option xml
by udo1 02 Jun '10

02 Jun '10

Hi everybody, I need the ballooning option with kvm using libvirt xml file and virsh (virsh create domain.xml) kvm line must be appended with the -balloon virtio switch to enable ballooning. (can be disabled if there no option or with -balloon none ) I currently using Ubuntu Lucid How can I define this in the domain xml file, or what need I to do to get this option? is there any option like enabling with <balloon>virtio</balloon> or disabling with <balloon>none</balloon> Thanks in Advance Udo Attila Fischer

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[libvirt-users] Java Bindings against RHEL5.5 KVM
by James Hogarth 02 Jun '10

02 Jun '10

Hi all, I'm doing some dev work against the native RHEL/centos 5.5 KVM installation for maintenance, creation and deletion of virtual guests using the libvirt API vai the java bindings from a java based web app. Things in general seem to be working - I can connect to and query the kvm instance using the libvirt interface and get a list of guests, pull information about them and stop/start/restart guests. I'm hitting a bit of an issue with creation of a guest however.... When calling domainDefineXML with XML following the domain XML specification (with the XML as per a dumpxml on the relevant box) I get an error creating the guest of: "internal error unknown lifecycle action restart " The virsh version information for the host is: Compiled against library: libvir 0.6.3 Using library: libvir 0.6.3 Using API: QEMU 0.6.3 Running hypervisor: QEMU 0.10.5 I have tried this against my ubuntu system as well with the same error - that has version: Compiled against library: libvir 0.7.5 Using library: libvir 0.7.5 Using API: QEMU 0.7.5 Running hypervisor: QEMU 0.12.3 I'm currently using jna 3.2.5 with libvirt 0.4.5 bindings. The example XML being used is: <domain type="kvm"> <name> newguestfomwebapp </name> <memory> 512 </memory> <vcpu> 1 </vcpu> <os> <type arch="x86_64" machine="rhel5.4.0"> hvm </type> <boot dev="hd"/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset="utc"/> <on_poweroff> destroy </on_poweroff> <on_reboot> restart </on_reboot> <on_crash> restart </on_crash> <devices> <emulator> /usr/libexec/qemu-kvm </emulator> <disk type="file" device="cdrom"> <driver name="qemu" type="raw"/> <source file="/var/lib/libvirt/images/ISOs/centos5.5-ks.iso"/> <target dev="hdc" bus="ide"/> <readonly/> </disk> <interface type="network"> <source network="default"/> <model type="virtio"/> </interface> <input type="mouse" bus="ps2"/> <graphics type="vnc" port="-1" autoport="yes"/> </devices> </domain> If I remove the lifecycle information from the xml I get: "unknown OS type hvm " The xml works from the command line with virsh define ... Anyone seen anything similar or have any ideas? Regards, James

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