August 2011 - Users - libvirt List Archives

[libvirt-users] ANNOUNCE: oz0.6.0 release
by Chris Lalancette 22 Aug '11

22 Aug '11

All, I'm pleased to announce release 0.6.0 of Oz. Oz is a program for doing automated installation of guest operating systems with limited input from the user. Release 0.6.0 is a bugfix and feature release for Oz. Some of the highlights between Oz 0.5.0 and 0.6.0 are: - The ability to specify the destination for the ICICLE output from oz-install and oz-generate-icicle - pydoc class documentation for all internal Oz classes - Automatic detection of KVM or QEMU at runtime (this allows oz to be used within virtual machines, although with a large performance hit) - Less scary warning messages in the debug output - Printing of the screenshot path when a build fails - Ability to run multiple Oz installs of the same OS at the same time - Support for OEL and ScientificLinux - Support for RHEL-5.7 - Support for CentOS 6 - Support for OpenSUSE arbitrary file injection and command execution - Ability to make the TDL (template) parsing enforce a root password - Rejection of localhost URLs for repositories (since they must be reachable from the guest operating system, localhost URLs make no sense) Fedora-14, Fedora-15, and RHEL-6 packages are available for this release. Note that to install the RHEL-6 packages, you must be running RHEL-6.1 or later. Instructions on how to get and use Oz are available at http://aeolusproject.org/oz.html If you have any questions or comments about Oz, please feel free to contact aeolus-devel(a)lists.fedorahosted.org or me (clalance(a)redhat.com) directly. Thanks to everyone who contributed to this release through bug reports, patches, and suggestions for improvement. -- Chris Lalancette

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[libvirt-users] issue with virErrorInitialize
by Sharad Mishra 22 Aug '11

22 Aug '11

One of my team mate investigated the issue where libvirt-cim was segfaulting when unloading providers. More info on this issue is at https://www.redhat.com/archives/libvirt-users/2011-August/msg00069.html Here is the gist of his investigation - I've looked into the libvirt source code and the reason for issues with the unload of libvirt-cim providers is there (and cimprovider -r forces an unload, just as cimserver shutdown does). virConnectOpen() does call virInitialize() which then will initialize the gcrypt library after initializes the thread setup ->virThreadInitialize(), creates the error reporting structure ->virErrorInitialize() and initialize a random number generator ->virRandomInitialize(). The issue is hidden in virErrorInitialize(). It calls virErrorInitialize() which uses the wrapper function virThreadLocalInit(&virLastErr, virLastErrFreeData);. virThreadLocalInit() calls pthread_create() with a destructor function (virLastErrFreeData()) which will be called on thread exits. Trouble here is that pthread_key_delete() is never called in libvirt, but next time the system runs through the key list and libvirt has been unloaded the system will jump to an already unloaded function (the pointer were virLastErrFreeData() was loaded formerly) and consequently crash the process. Fixing this will not be easy, but a start would be a libvirt function on its externalize interface that allows cleanup short before library unload, or alternatively libvirt does the thread key delete on library unload. Thanks Sharad Mishra Open Virtualization Linux Technology Center IBM

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[libvirt-users] How to Connect a new CD via virt-manager
by Marc Haber 22 Aug '11

22 Aug '11

Hi, I have virt-manager 0.9 connecting to a libvirtd 0.9.3 on Debian unstable. Hypervisor being used is KVM. In a VM, I can select the "IDE CDROM 1" and click on "disonnect" which makes the virtual disk disappear from the virtual drive and the former disconnect button now reads "connect". Hence, when I click there, nothing happens. Currently, the only way I am aware to get a new CD in the virtual drive is to delete it and to add a new virtual CD drive. Is this a bug, or am I doing things wrong? Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Mannheim, Germany | lose things." Winona Ryder | Fon: *49 621 72739834 Nordisch by Nature | How to make an American Quilt | Fax: *49 3221 2323190

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[libvirt-users] Invitation to connect on LinkedIn
by Hao Pan 22 Aug '11

22 Aug '11

LinkedIn ------------ I'd like to add you to my professional network on LinkedIn. - Hao Hao Pan Student at Peking University China Confirm that you know Hao Pan https://www.linkedin.com/e/qej7u0-grmy9fff-2v/isd/3931333441/YXbn8TLa/ -- (c) 2011, LinkedIn Corporation

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[libvirt-users] Detaching LVM volume from Windows guest
by mkey 20 Aug '11

20 Aug '11

Hello, I have some difficulties regarding to above title. Windows as guest OS is running on KVM(Ubuntu natty). After attaching LVM volume to guest OS and did "safely remove device" in guest windows, detaching volume was failed. > root@localhost:/opt/win# virsh detach-disk testwin vdc > error: Failed to detach disk > errpr: operation failed: detaching virtio-disk2 device failed: Device 'virtio-disk2' not found But kvm(qemu?) seems like detaching device successfully. > root@localhost:/opt/win# virsh qemu-monitor-command testwin 'info block' > drive-virtio-disk0: type=hd removable=0 file=/opt/win/win2008server.virtio.img ro=0 drv=qcow2 encrypted=0 So, problem is, libvirt doesn't know detaching, but kvm(qemu) knows. Again, please let me know if anybody has workaround. P.S. at some website, I found "hotunplugging is not supported in current libvirt", is that related on this matter? Regards, mkey

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[libvirt-users] Detaching LVM volume from Windows guest
by mkey 20 Aug '11

20 Aug '11

Hello, I have some difficulties regarding to above title. Windows as guest OS is running on KVM(Ubuntu natty). After attaching LVM volume to guest OS and did "safely remove device" in guest windows, detaching volume was failed. > root@localhost:/opt/win# virsh detach-disk testwin vdc > error: Failed to detach disk > errpr: operation failed: detaching virtio-disk2 device failed: Device 'virtio-disk2' not found But kvm(qemu?) seems like detaching device successfully. > root@localhost:/opt/win# virsh qemu-monitor-command testwin 'info block' > drive-virtio-disk0: type=hd removable=0 file=/opt/win/win2008server.virtio.img ro=0 drv=qcow2 encrypted=0 So, problem is, libvirt doesn't know detaching, but kvm(qemu) knows. Again, please let me know if anybody has workaround. P.S. at some website, I found "hotunplugging is not supported in current libvirt", is that related on this matter? Regards, mkey

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[libvirt-users] build libvirt from source yourself and make sure to get the XenAPI driver enabled.
by Lovocas Mou 19 Aug '11

19 Aug '11

Hi, I want install libvirt on my ubuntu11.04, and I want to test using libvirt to manage a xenserver, after download the tar and extract them when in this step : ./configure --with-esx --with-xenapi --prefix=/opt/libvirt .... checking for xen_vm_start in -lxenserver... no configure: error: You must install the XenServer Library to compile XenAPI driver with -lxenserver ..... I get this error, but i get very few information about it from google. >>libvirt can use XenAPI via libxenserver [1]. That should allow you to >> use libvirt with a Citrix XenServer. You can use virsh like this >> assuming you have a libxenserver enabled libvirt: >> >> virsh -c xenapi://my-xen-server >> >> But it's true, there is no documentation about this on the libvirt website >> yet. >> >> [1] http://community.citrix.com/display/xs/Download+SDKs I download the libxenserver source and binary file from the above url, but I don't know how to install it and how to use -lxenserver, can anyone help me? thanks!

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[libvirt-users] Detecting the last user of a connection has closed.
by Andy Joslin 18 Aug '11

18 Aug '11

The documentation says something that concerns me: http://libvirt.org/html/libvirt-libvirt.html#virConnectClose "It is possible for the last virConnectClose<http://libvirt.org/html/libvirt-libvirt.html#virConnectClose>to return a positive value if some other object still has a temporary reference to the connection, but the application should not try to further use a connection after the virConnectClose<http://libvirt.org/html/libvirt-libvirt.html#virConnectClose>that matches the initial open." The application I am working on requires that I know when the last thread using this connection goes away, so I can properly cleanup some overhead. If I can't trust the return value of this call, how will I know that the connection is indeed torn down? Under what circumstances will the virConnectClose behave this way? Thanks, BTW, I am using 0.8.2

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[libvirt-users] which vols added to storage pool during refresh?
by Gareth S Bestor 17 Aug '11

17 Aug '11

(opps, actually meant to post this to libvirt-users instead of libvirt-cim...) We're looking at a problem when we have a libvirt pool defined, below [root@xnl2192 ~]# virsh pool-dumpxml ScsiPool-host2 <pool type='scsi'> <name>ScsiPool-host2</name> <uuid>f2ea1882-881f-9f49-838d-39e070f68002</uuid> <capacity>136583315456</capacity> <allocation>136583315456</allocation> <available>0</available> <source> <adapter name='host2'/> </source> <target> <path>/dev/disk/by-id</path> <permissions> <mode>0700</mode> <owner>-1</owner> <group>-1</group> </permissions> </target> </pool> As you can see, this pool maps to /dev/disk/by-id. There may be a large number of actual volume entries in /dev/disk/by-id, however it appears only a distinct subset of them are actually added into the libvirt pool when you do a pool-refresh. What does libvirt check when determining which, and whether or not, to add one of these volume into the vol-list? In particular, we have a case when one specific volume in /dev/disk/by-id is *not* added into the pool, and no amount of pool-refresh makes a difference. We did notice that if you remove all the sym links in /dev/disk/by-id and do a pool-refresh, that libvirt re-scans the bus, recreates the links in /dev/disk/by-id, and adds (some of) the volumes back into the vol-list. But not this one problematic vol, so clearly there is something about this vol that libvirt doesnt like and why it is (deliberately?) not added to the pool. What checks, etc does libvirt make against vols when determining whether to add them to a pool? - G Dr. Gareth S. Bestor IBM Senior Software Engineer Systems & Technology Group - Systems Management Standards 971-285-6375 (mobile) bestor(a)us.ibm.com_______________________________________________ Libvirt-cim mailing list Libvirt-cim(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-cim

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Re: [libvirt-users] Migration hangs on Gentoo with KVM
by Eric Blake 17 Aug '11

17 Aug '11

[re-adding the list] On 08/01/2011 04:22 PM, Jonathan Stoppani wrote: > > On Aug 1, 2011, at 16:20 , Eric Blake wrote: > >> On 08/01/2011 04:11 PM, Jonathan Stoppani wrote: >>> Hi there, >>> >>> I'm trying to migrate a domain between two Gentoo hosts using KVM as hypervisor, but the migration hangs. >>> I tried both live or offline migration modes without success. >> >> Does your 'nc' command have a -q option? If so, then this is probably >> >> https://bugzilla.redhat.com/show_bug.cgi?id=726174 >> > > Thanks for the prompt answer Eric! Yes, nc has a q option: > > -q, --hold-timeout=SEC1[:SEC2] Set hold timeout(s) for local [and remote] Glad to hear that we found root cause to your problems, then. > > The bug specifically refers to ssh, does that mean that it should work over tcp? The problem is that libvirt is trying to start a remote nc session over ssh; but looking at http://libvirt.org/remote.html, it looks like ssh is the only protocol using nc in that manner (so yes, you can probably avoid the issue by using tcp or tls). Meanwhile, I think you can work around it without patching libvirt, by using this as your remote URI: qemu+ssh://user@remotehost/system?netcat=/path/to/nc-wrapper where nc-wrapper is an executable script installed on remotehost, looking like: #!/bin/sh exec /path/to/real/nc -q0 "$@" -- Eric Blake eblake(a)redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org

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