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[libvirt-users] virsh: migration job: unexpectedly failed
by Xing.x.Gao 12 Jun '12

12 Jun '12

Hi,I am use virsh and test the migration command, on server.example.com: # rpm -qa|grep libvirt libvirt-0.9.10-21.el6.x86_64 libvirt-python-0.9.10-21.el6.x86_64 libvirt-client-0.9.10-21.el6.x86_64 # virsh version Compiled against library: libvir 0.9.10 Using library: libvir 0.9.10 Using API: QEMU 0.9.10 Running hypervisor: QEMU 0.14.1 #cat /etc/libvirt/libvirt.conf uri_aliases = [ "host1=qemu+ssh://root@host1.example.com/system", ] node1.example.com is the same version with server.example.com and on both server has the same storage pool with same path, first step,as use the local storage,i copied the vm win7's disk from server.example.com to node1.example.com's storage pool,and did a pool-refresh. 2nd step: on server.example.com i use this command to do the migration job: #virsh start win7 # virsh migrate win7 host1 --copy-storage-inc --persistent --live --unsafe when the migation process begin ,i can see the win7 appear on the node1.example.com whos status is paused,but just after a few secs,errs come out: (server.example.com) # virsh migrate win7 host1 --copy-storage-inc --persistent --live --unsafe error: operation failed: migration job: unexpectedly failed error: Reconnected to the hypervisor i've tried to solve this problem, but failed. thanks.

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[libvirt-users] How to list and change domain's disk image file
by Ricardo Hillbrecht 12 Jun '12

12 Jun '12

Hi I'm writing a C program using libvirt API and need to list the storage volumes used by each domain. I'm wondering if there is a way to do this better of searching the XML strings of all domains, does anyone can suggest me something ? I also need to create a function to change the img file of a given domain. I intend to do the following: 1. virDomainGetXMLDesc (domain) 2. change the XML to other img file 3. virDomainUndefine (domain) 4. virDomainCreateXML (changed XML) Am i correct doing this ? There is a better method ? Thanks Ricardo

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[libvirt-users] A RFE for libvirt
by Sebastien Douche 08 Jun '12

08 Jun '12

On Thu, Jun 7, 2012 at 12:38 AM, Eric Blake <eblake(a)redhat.com> wrote: > I personally find it easier to use virt-manager or virt-install or > gnome-boxes to create an initial guest template, then to modify that XML > for any final tweaks before using the guest in earnest. Right, but the lack of provisioning is a huge miss. Before to use a remote tool (libvirt), you must 1/ connect on the remote machine, 2/ create a xml file and 3/ define the domain. > how easy it would be to add guest templating directly into libvirt, nor > whether it would be duplicating effort that has already been coded > elsewhere. Integrating virt-install & virt-clone would be imho very good start point. -- Sebastien Douche <sdouche(a)gmail.com> Twitter: @sdouche / G+: +sdouche

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[libvirt-users] A RFE for libvirt
by whuang 07 Jun '12

07 Jun '12

Hi, I am a libvirt user , there is a requirement about libvirt : I need a virsh cmd like "#virsh *create-as* --disk --net " to create a very sample guest I have not xml file and I think it's a little hard for me to create a NEW xml for libvirt , so I need a virsh cmd like "vol-create-as " help me do that. I know there are a lot of options for creating a guest , I just need --disk and --net options , others libvirt can set a defaut value . I just want an easy way to create a guest :> Wenlong -- Best Regards! Wenlong Huang IRC Account: wenlong Phone: 62608117 / 15011214521

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[libvirt-users] Fine grained authorisation
by Sam Wilson 07 Jun '12

07 Jun '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi List, I am trying to provide a solution using KVM on RHEL for a number of technical staff sharing server resources. We would like to be able to "restrict" a number of guests from certain users to follow the principle of least privilege. So in short, is there a way of defining access to individual guests via libvirt / polkit or is read only / read write the best we can expect for the foreseeable future? Cheers, Sam -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iF4EAREIAAYFAk/QWhsACgkQFdt86iEfl/cYagD9FGktnsqyGkfzXWkUyFtJmQc2 VX6ZG2iXmKD75R7c6IgA/j5WvnsXdBA6jPO9/WnX83CmmorPc9oRN6lpYTxXgkON =38VZ -----END PGP SIGNATURE-----

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Re: [libvirt-users] The default location of vm snapshots
by SimpleCloud 07 Jun '12

07 Jun '12

Thanks a lot for the details. From http://wiki.libvirt.org/page/Snapshots, we have to pause the domain before taking snapshot and resume after. Is there any way to do "live" snapshotting for running domain or reduce pause time? Thanks, Lei ------------------ Original ------------------ From: "Eric Blake"<eblake(a)redhat.com>; Date: Wed, Jun 6, 2012 08:24 PM To: "SimpleCloud"<simplecloud(a)qq.com>; Cc: "libvirt-users"<libvirt-users(a)redhat.com>; Subject: Re: [libvirt-users] The default location of vm snapshots On 06/06/2012 03:20 AM, SimpleCloud wrote: > Hi all, > > > Where could I find the memory dump and disk snapshots for vm after command "virsh snapshot-create <some_running_vm>"? Thanks in advance. This particular form of snapshot is called the 'system checkpoint' snapshot, and the current qemu implementation is that the snapshot creates internal snapshots in your qcow2 files. If you do 'qemu-img info $path_to_img', you will see the disk snapshots listed as internal snapshots for each image associated with the domain, as well as the first qcow2 file also having memory associated with the internal snapshot. > > > I found the xml files in /var/lib/libvirt/qemu/snapshot/, but hava no idea about the raw snapshot file. Looking in /var/lib/libvirt is generally unsupported (that is an internal libvirt detail, and subject to change in future releases). The only way to safely look at the snapshot XML is via the API (virDomainSnapshotGetXMLDesc, which is wrapped by 'virsh snapshot-dumpxml'). I am also hoping to submit a patch that will allow you the option to create an external snapshot rather than using qcow2 internal snapshots, but that's not in the code base yet. -- Eric Blake eblake(a)redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org

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[libvirt-users] qemu-img snapshots with backing stores?
by Sean Abbott 07 Jun '12

07 Jun '12

So, I was attempting to use qemu snapshots with backing stores. The QEMU docs (http://wiki.qemu.org/Documentation/CreateSnapshot) make it sound like you simply point your qemu at the snapshot after it's creation, and you're golden. When attempting this with libvirt, though, it fails. I created a snapshot using the above tutorial. the resulting file is disk.0, and a qmeu-img info on it returns: image: disk.0 file format: qcow2 virtual size: 29G (31457280000 bytes) disk size: 140K cluster_size: 65536 backing file: /var/lib/one/public/lin_client_current.qcow2 (actual path: /var/lib/one/public/lin_client_current.qcow2) So that all looks groovy, right? Then, I created (via opennebula) an xml deployment file like so: http://paste.ubuntu.com/1027145/ When I attempt to do a virsh create, I get the following errors: virsh # create deployment.0 error: Failed to create domain from deployment.0 error: internal error process exited while connecting to monitor: file=/var/lib/one/vm/56/images/disk.0,if=none,id=drive-virtio-disk0,boot=on,format=qcow2,cache=none qemu-kvm: boot=on|off is deprecated and will be ignored. Future versions will reject this parameter. Please update your scripts. qemu-system-x86_64: -drive file=/var/lib/one/vm/56/images/disk.0,if=none,id=drive-virtio-disk0,boot=on,format=qcow2,cache=none,boot=on: could not open disk image /var/lib/one/vm/56/images/disk.0: Invalid argument So...something isn't working. Is it possible to do this, or should I give up on this path? Thanks! sean

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[libvirt-users] The default location of vm snapshots
by SimpleCloud 06 Jun '12

06 Jun '12

Hi all, Where could I find the memory dump and disk snapshots for vm after command "virsh snapshot-create <some_running_vm>"? Thanks in advance. I found the xml files in /var/lib/libvirt/qemu/snapshot/, but hava no idea about the raw snapshot file. Thanks, Lei

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[libvirt-users] [Fwd: error: this function is not supported by the connection driver : virConnectNumOfStoragePool]
by Onkar 05 Jun '12

05 Jun '12

Hello All, Any idea on this issue ? Regards, Onkar -------- Forwarded Message -------- From: Onkar <kernzap(a)gmail.com> To: libvir-list <libvir-list(a)redhat.com> Subject: error: this function is not supported by the connection driver : virConnectNumOfStoragePool Date: Wed, 30 May 2012 21:29:42 +0530 Hello, I configured libvirt like this ./configure --prefix=/ --exec-prefix=/usr/ --libdir=/usr/lib64/ --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-qemu --with-libvirtd --with-selinux --with-network --with-libblkid and then, make -j4 make install and then # virsh list --all Id Name State ---------------------------------------------------- - vm1 shut off # virsh pool-list --all error: Failed to list active pools error: this function is not supported by the connection driver: virConnectNumOfStoragePools getting this error , any clues on why is this error ? Regards, Onkar

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[libvirt-users] converting save/dump output into physical memory image
by Andrew Tappert 04 Jun '12

04 Jun '12

A lot of people in the security community, myself included, are interested in memory forensics these days. Virtualization is a natural fit with memory forensics because it allows one to get access to a guest's memory without having to introduce any extra software into the guest or otherwise interfere with it. Incident responders are particularly interested in getting memory dumps from systems they're investigating. Virsh has "save" and "dump" commands for storing the state of a guest to a file on disk, but memory of KVM guests doesn't get saved in the "standard" input format for memory forensics tools, which is a raw physical memory image. (This is what you'd get via the classical "dd /dev/mem" approach or the contemporary equivalent using the crash driver; and VMware Server and Workstation produce .vmem files, which are such raw physical memory images, when a guest is paused or snapshotted.) In order to analyze the memory of Libvirt/KVM guests with my Linux memory forensics software, Second Look, I've created a tool for converting Libvirt-QEMU-save files (output of virsh save command) or QEMU-savevm files (output of virsh dump command) to raw physical memory images. I've got a basic working capability, though I'm still tracking down some problems with a guest allocated 8GB RAM--not all the memory seems to be present in the save or dump file. And I haven't tested very extensively yet, version support is limited to what I myself am currently running, etc. I'd like to know if this is a capability that others are interested in. Is this something that would be of interest to the Libvirt project if I were to contribute the code, or to the KVM project, or do you think it best exists as a separate project? I've also got a proof-of-concept tool for converting hibernate images to raw physical memory images. Perhaps a collection of tools for converting various memory dump formats would be a good project. Anyone else interested in this kind of stuff? As an author of commercial memory forensics software I've got a vested interest in availability of good memory acquisition capabilities. But there are a number of people working on FOSS Linux memory analysis tools, too... Andrew

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