- Users - libvirt List Archives

[libvirt-users] Passing dhcp-options
by Michael Hierweck 09 May '12

09 May '12

Hi, I'm running some Windows clients inside KVM virtual maschines managed by libvirt. These clients are managed by a Samba 3 PDC. Therefore the DHCP needs so supply corresponding WINS server (dhcp option 44) not only IP address and DNS server. Is it possible to make dnsmasq driven by libvirt to supply custom dhcp options? I would appreciate something like this in the network.xml: [...] <dhcp> <range [...] /> <option key="key1">value1</option> <option key="key2">value2</option> [...] </dhcp> [...] Is there any other solution? Using DHCP to configure clients does not make sense when parts (WINS) of the IP configurations need to be hard coded in the clients. Thanks in advance Michael -- EDV-Serviceteam Annika & Michael Hierweck GbR Egerstraße 53, 44225 Dortmund (Germany) http://www.edv-serviceteam.net

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[libvirt-users] creation of storage volume fails
by John Wayne 08 May '12

08 May '12

hi, i am getting this error below when i try to create a storage volume: libvirt.virStoragePool.CreateXML(storagepoolobject,xmldesc,0) AttributeError: class virStoragePool has no attribute 'CreateXML' my code is: xmldesc="xml description of storage volume which i got from sudo virsh vol-dumpxml" #get a storage pool object to use in creating a volume storagepoolobject=libvirt.virConnect.storagePoolLookupByName(conn,'poolname') #now try to create the volume using the above storage pool object libvirt.virStoragePool.CreateXML(storagepoolobject,xmldesc,0) from python: -bash-4.1$ python >>> import libvirt >>> dir(libvirt.virStoragePool) ['UUID', 'UUIDString', 'XMLDesc', '__del__', '__doc__', '__init__', '__module__', 'autostart', 'build', 'connect', 'create', 'createXML', 'createXMLFrom', 'delete', 'destroy', 'info', 'isActive', 'isPersistent', 'listVolumes', 'name', 'numOfVolumes', 'refresh', 'setAutostart', 'storageVolLookupByName', 'undefine'] >>> help(libvirt.virStoragePool.createXML) Help on method createXML in module libvirt: createXML(self, xmldesc, flags) unbound libvirt.virStoragePool method Create a storage volume within a pool based on an XML description. Not all pools support creation of volumes from the libvirt.org documentation: http://libvirt.org/html/libvirt-libvirt.html#virStorageVolCreateXML virStorageVolPtrvirStorageVolCreateXML(virStoragePoolPtr pool, const char * xmldesc, unsigned int flags) Create a storage volume within a pool based on an XML description. Not all pools support creation of volumes pool:pointer to storage pool xmldesc:description of volume to create flags:extra flags; not used yet, so callers should always pass 0 Returns:the storage volume, or NULL on error

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[libvirt-users] Destroy VM failed.
by david_zhu 08 May '12

08 May '12

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[libvirt-users] list storage pools and volumes using python api calls
by Syed A. Ali 08 May '12

08 May '12

how do i list storage pools and volumes using the python bindings? basically the python api calls for virsh pool-list and virsh vol-list thanks

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[libvirt-users] libvirt read only connections upgraded to full access connections
by Doug Goldstein 07 May '12

07 May '12

I've gone through the docs and the API and I didn't see a way to do this but I wanted to confirm. My application gives a bunch of info on the state of a VM that's available through a connection created through libvirt.openReadOnly() but at some point the user might want to restart the VM let's say. This requires a full privilege connection, rather than opening a new connection I was hoping to upgrade the existing one to a full privilege connection. Just confirming that's not possible. -- Doug Goldstein

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[libvirt-users] libvirt python api for storage-volumes and storage-pools
by John Wayne 07 May '12

07 May '12

hi, how do i list storage pools and volumes using the python bindings? basically the python api calls for virsh pool-list and virsh vol-list thanks

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[libvirt-users] Libvirt LXC and VCPU?
by Samuel Hassine 07 May '12

07 May '12

Hi, We are using Openstack and Libvirt/LXC as our virtualization endpoint. Here is an example of one of our libvirt domain: http://paste.debian.net/167276/ So we have <vcpu>4</vcpu>. But the command : root@PAR-SRV-02-MASTER:/etc/libvirt/lxc# virsh --connect lxc:/// dominfo instance-0000004a Id: 17495 Name: instance-0000004a UUID: d600b83f-6d34-4a08-b905-b9daf67ac7f7 OS Type: exe State: running CPU(s): 1 CPU time: 25886.4s Max memory: 4194304 kB Used memory: 140272 kB Persistent: yes Autostart: disable Managed save: unknown give only "1" CPU. Is it normal? Best regards. Sam

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[libvirt-users] printing domain information
by John Wayne 07 May '12

07 May '12

how do i print the features of a domain from functions that return a domain object? for instance mydomain = virdomain=libvirt.virConnect.lookupByID(conn,domainid) so mydomain is virDomainPtr, which is typedef virDomain * virDomainPtr i am not sure on how to print the domain object features in python, such as name, disk size, etc

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[libvirt-users] Submission Deadline Extension
by VHPC 12 06 May '12

06 May '12

we apologize if you receive multiple copies of this CFP =================================================================== CALL FOR PAPERS 7th Workshop on Virtualization in High-Performance Cloud Computing VHPC '12 as part of Euro-Par 2012, Rhodes Island, Greece =================================================================== Date: August 28, 2012 Workshop URL: http://vhpc.org SUBMISSION DEADLINE: June 11, 2012 - Full paper submission (extended) SCOPE: Virtualization has become a common abstraction layer in modern data centers, enabling resource owners to manage complex infrastructure independently of their applications. Conjointly, virtualization is becoming a driving technology for a manifold of industry grade IT services. The cloud concept includes the notion of a separation between resource owners and users, adding services such as hosted application frameworks and queueing. Utilizing the same infrastructure, clouds carry significant potential for use in high-performance scientific computing. The ability of clouds to provide for requests and releases of vast computing resources dynamically and close to the marginal cost of providing the services is unprecedented in the history of scientific and commercial computing. Distributed computing concepts that leverage federated resource access are popular within the grid community, but have not seen previously desired deployed levels so far. Also, many of the scientific data centers have not adopted virtualization or cloud concepts yet. This workshop aims to bring together industrial providers with the scientific community in order to foster discussion, collaboration and mutual exchange of knowledge and experience. The workshop will be one day in length, composed of 20 min paper presentations, each followed by 10 min discussion sections. Presentations may be accompanied by interactive demonstrations. TOPICS Topics of interest include, but are not limited to: Higher-level cloud architectures, focusing on issues such as: - Languages for describing highly-distributed compute jobs - Workload characterization for VM-based environments - Optimized communication libraries/protocols in the cloud - Cross-layer optimization of numeric algorithms on VM infrastructure - System and process/bytecode VM convergence - Cloud frameworks and API sets - Checkpointing/migration of large compute jobs - Instrumentation interfaces and languages - VMM performance (auto-)tuning on various load types - Cloud reliability, fault-tolerance, and security - Software as a Service (SaaS) architectures - Research and education use cases - Virtualization in cloud, cluster and grid environments - Cross-layer VM optimizations - Cloud use cases including optimizations - VM-based cloud performance modelling - Performance and cost modelling Lower-level design challenges for Hypervisors, VM-aware I/O devices, hardware accelerators or filesystems in VM environments, especially: - Cloud, grid and distributed filesystems - Hardware for I/O virtualization (storage/network/accelerators) - Storage and network I/O subsystems in virtualized environments - Novel software approaches to I/O virtualization - Paravirtualized I/O subsystems for modified/unmodified guests - Virtualization-aware cluster interconnects - Direct device assignment - NUMA-aware subsystems in virtualized environments - Hardware Accelerators in virtualization (GPUs/FPGAs) - Hardware extensions for virtualization - VMMs/Hypervisors for embedded systems Data Center management methods, including: - QoS and and service levels - VM cloud and cluster distribution algorithms - VM load-balancing in Clouds - Hypervisor extensions and tools for cluster and grid computing - Fault tolerant VM environments - Virtual machine monitor platforms - Management, deployment and monitoring of VM-based environments - Cluster provisioning in the Cloud PAPER SUBMISSION Papers submitted to the workshop will be reviewed by at least two members of the program committee and external reviewers. Submissions should include abstract, key words, the e-mail address of the corresponding author, and must not exceed 10 pages, including tables and figures at a main font size no smaller than 11 point. Submission of a paper should be regarded as a commitment that, should the paper be accepted, at least one of the authors will register and attend the conference to present the work. Accepted papers will be published in the Springer LNCS series - the format must be according to the Springer LNCS Style. Initial submissions are in PDF; authors of accepted papers will be requested to provide source files. Format Guidelines: http://www.springer.de/comp/lncs/authors.html Style template: ftp://ftp.springer.de/pub/tex/latex/llncs/latex2e/llncs2e.zip Abstract Submission Link: http://edas.info/newPaper.php?c=11943 IMPORTANT DATES Rolling abstract submission June 11, 2012 - Full paper submission (extended) June 29, 2012 - Acceptance notification July 20, 2012 - Camera-ready version due August 28, 2012 - Workshop Date CHAIR Michael Alexander (chair), TU Wien, Austria Gianluigi Zanetti (co-chair), CRS4, Italy Anastassios Nanos (co-chair), NTUA, Greece PROGRAM COMMITTEE Paolo Anedda, CRS4, Italy Giovanni Busonera, CRS4, Italy Brad Calder, Microsoft, USA Roberto Canonico, University of Napoli Federico II, Italy Tommaso Cucinotta, Alcatel-Lucent Bell Labs, Ireland Werner Fischer, Thomas-Krenn AG, Germany William Gardner, University of Guelph, USA Marcus Hardt, Forschungszentrum Karlsruhe, Germany Sverre Jarp, CERN, Switzerland Shantenu Jha, Louisiana State University, USA Xuxian Jiang, NC State, USA Nectarios Koziris, National Technical University of Athens, Greece Simone Leo, CRS4, Italy Ignacio Llorente, Universidad Complutense de Madrid, Spain Naoya Maruyama, Tokyo Institute of Technology, Japan Jean-Marc Menaud, Ecole des Mines de Nantes, France Dimitrios Nikolopoulos, Foundation for Research&Technology Hellas, Greece Jose Renato Santos, HP Labs, USA Walter Schwaiger, TU Wien, Austria Yoshio Turner, HP Labs, USA Kurt Tutschku, University of Vienna, Austria Lizhe Wang, Indiana University, USA Chao-Tung Yang, Tunghai University, Taiwan DURATION: Workshop Duration is one day. GENERAL INFORMATION The workshop will be held as part of Euro-Par 2012. Euro-Par 2012: http://europar2012.cti.gr/

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[libvirt-users] storage-pools and volumes
by John Wayne 06 May '12

06 May '12

hi, i am trying to create a domain using libvirt 0.9.4 python api and i can't find any information on how to use the libvirt python api with linux logical volumes http://libvirt.org/guide/html-single/#Application_Development_Guide-Device_… is TBD i figured out that i need to use defineXML to create a domain, however for the disk part in the xml, i am not sure if i need to create the LVM first, or just specify the LVM path and libvirt will create the lvm for me and stick the domain on the lvm <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/vg001/myhost.blah.com'/> <target dev='hda' bus='ide'/> </disk> /usr/lib64/python2.6/site-packages/libvirt.py has: ret = libvirtmod.virStorageVolCreateXML(self._o, xmldesc, flags) if ret is None:raise libvirtError('virStorageVolCreateXML() failed', pool=self) __tmp = virStorageVol(self, _obj=ret) return __tmp however i don't know the xml format for storage vol thanks

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[libvirt-users] maxvcpu
by John Wayne 04 May '12

04 May '12

hi, i am trying to find out the max vcpus supported for any domain by my hypervisor, however i am having some trouble with the below: vcpu=5 maxvcpus=libvirt.virConnect.getMaxVcpus(conn,'kqemu') if maxvcpus <= vcpu: logging.debug('checkmaxvcpus: max vcpus on hypervisor %i is less than requested vcpu of %i' % (maxvcpus, vcpu)) return 0 else: return 1 http://libvirt.org/html/libvirt-libvirt.html#virConnectGetMaxVcpus says that i need: conn:pointer to the hypervisor connection type:value of the 'type' attribute in the <domain> element http://libvirt.org/formatdomain.html says that type is of "The allowed values are driver specific, but include "xen", "kvm", "qemu", "lxc" and "kqemu"." i am using KVM, so i used kqemu, however maxvcpus is always 1, which does not seem right, since i should be able to create a vm with more than 1 vcpu...

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[libvirt-users] Libvirt heavy CPU usage
by Samuel Hassine 04 May '12

04 May '12

Hi there, We are currently using OpenStack with the libvirt driver (libvirt version: 0.9.11.3) and LXC containers. We are observing a really bad CPU usage of libvirt_lxc processes: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 28828 root 20 0 40852 1376 832 R 104.4 0.0 516:44.27 libvirt_lxc 20560 root 20 0 40852 1372 832 R 98.6 0.0 454:42.48 libvirt_lxc 22419 root 20 0 40852 1376 832 R 98.6 0.0 499:16.98 libvirt_lxc 26238 root 20 0 40852 1376 832 R 98.6 0.0 500:42.94 libvirt_lxc 28307 root 20 0 40852 1376 832 R 92.8 0.0 594:16.96 libvirt_lxc 20408 root 20 0 40852 1376 832 R 69.6 0.0 364:21.02 libvirt_lxc 17495 root 20 0 40852 1372 832 R 63.8 0.0 421:40.78 libvirt_lxc 23725 root 20 0 40852 1376 832 R 46.4 0.0 459:03.75 libvirt_lxc 24710 root 20 0 40852 1368 832 R 40.6 0.0 494:30.45 libvirt_lxc 1350 root 20 0 40852 1372 828 R 34.8 0.0 358:49.72 libvirt_lxc But theses domains are not really active, they are just "minimal" virtual engines without any trafic or load. Is it a "normal" way or there is something wrong? Thanks for your answer. Best regards. Sam

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[libvirt-users] free memory on hypervisor
by John Wayne 04 May '12

04 May '12

i am trying to get the free memory on a hypervisor using libvert, with the python api bindings as per http://libvirt.org/python.html, it should be pretty easy, however the below is failing: #conn is a connection object freemem=libvirt.virNode.getFreeMemory(conn) although this works fine: software=libvirt.virConnect.getType(conn) if software == 'QEMU': logging.debug('hypervisor is type QEMU')

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[libvirt-users] communicate with vm
by me,apporc 03 May '12

03 May '12

We need to create many virtual machines and assign an static ip for each of them. To do this, 1. we can use one dhcp server to assign ip for them, and bind the MAC to it's ip. But we got many many machines, so this is not easy to operate for admins. 2. we can just create the vm and then let the client to config the ip from within the operating system. But the client don't want to, and sometimes in fact they should not be authorized to do that. Are there any way else to do this? I mean is there some API for that we can use? or just mount the vm image file and change the network configuration file? If any API for that, can we change the config while the os in the vm is running? Thanks, any help is appreciated.

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[libvirt-users] ESX support for virt-install
by Filip Skola 03 May '12

03 May '12

Hi! I try to integrate ESXi guests to beaker. I'd like to have dynamic installations of guests just like KVM and Xen is done. I know that virt-install is not currently supported by libvirt, so I'd like to ask, do you plan to add esxdrv support for virt-install? What's current status? Thank you, Filip

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[libvirt-users] USB passthrough: flexible configuration in XML-file needed
by eGerlach 03 May '12

03 May '12

Hi, I need a flexible USB passthrough of a USB-device. If the device is turned off by the current switch (230Volt) the VM should start and not claim that the USB device is left. Using: <devices> … <hostdev mode='subsystem' type='usb'> <source> <vendor id='0x152a'/> <product id='0x8180'/> </source> </hostdev> </devices> </domain> in libvirt XML-config file the boot process is stopped if the device is switched off. How can I configure the xml-file to make ich more flexible? Another possibility would be to passthrough USB-Slot No1 (or No 2, ...) to the VM. So an arbitrary USB-device that is plugged in to USB-Slot1 would be recognized by the VM. In another forum I got the hint to start the VM by: -usb -usbdevice host:0.* -usbdevice host:1.* to passthrough USB-Slot No1 and No 2. How can I configure that in libvirt xml-file? tia Eckard

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[libvirt-users] Regarding persistence of VM's after live migration (virDomainMigrateToURI() problem)
by Coding Geek 02 May '12

02 May '12

Hello I am working with 3 host machines each running xen with shared NFS storage. I am working on automatic load balancing if one host is over utilized and another is under utilized by measuring the utilization from xentop. I am facing a problem after migration of VM. I am setting the flags ( 1| 8| 16) in order to do live migration, persist VM on destination, undefine host from source. After migration if I shut off the migrated VM on destination host it does not persist. I am using the migrateToURI() API for migration. Please help how to make VM persist on destination. Thank you, Tasvinder Singh -- -- "To Iterate is Human, To Recurse is Divine"

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[libvirt-users] Snooze energy-efficient cloud manager is available as open-source!
by Eugen Feller 02 May '12

02 May '12

Dear all, herewith we proudly announce the first public release of Snooze. Snooze is an open-source scalable, autonomic, and energy-efficient virtual machine (VM) management framework for private clouds based on libvirt. Similarly to other VM management frameworks such as Nimbus, OpenNebula, Eucalyptus, and OpenStack it allows to build compute infrastructures from virtualized resources. Particularly, once installed and configured users can submit and control the life-cycle of a large number of VMs. However, contrary to existing frameworks for scalability and fault tolerance, Snooze employs a self-organizing and healing hierarchical architecture. Moreover, it performs distributed VM management and is designed to be energy efficient. Therefore, it implements features to monitor and estimate VM resource (CPU, memory, network Rx, network Tx) demands, detect and resolve overload/underload situations, perform dynamic VM consolidation through live migration, and finally power management to save energy. Last but not least, it integrates a generic scheduler which allows to implement any VM placement algorithms. The system can be either used to manage production data centers or as an experimental testbed for advanced (i.e. requiring live migration support) VM placement algorithms. Please see our website "http://snooze.inria.fr" for more information. We are looking forward for your feedback and contributions! Best regards, Eugen -- Eugen Feller PhD student, University of Rennes I INRIA Rennes Bretagne Atlantique - MYRIADS project Tel: +33 (0) 2 99 84 72 68 Web: http://www.irisa.fr/myriads/members/efeller

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[libvirt-users] Python Libvirt Bindings
by John Wayne 02 May '12

02 May '12

Hi, Can anyone please share sample Python code for using qemu+tcp with SASL or qemu+tls with SASL? (i.e., connecting to a hypervisor using qemu+tls or qemu+tcp when a username/password using SASL has been defined on the hypervisor) I am having some trouble figuring out how to use callbacks for authenticating from with my Python program. I assume I will have to use http://libvirt.org/html/libvirt-libvirt.html#virConnectCredentialType, but I can't quite translate that to Python from C. Thanks

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[libvirt-users] serial console locking for a domain (concurrent access = garbled output)
by Dusty Mabe 01 May '12

01 May '12

Hi, I am seeing an issue in libvirt-0.9.4-23.el6_2.7.x86_64.rpm where my virsh console output for a domain gets garbled because I have virt-manager running and it is also trying to access the serial device for the guest domain. Basically there is concurrent serial access and half the text ends up on one end while the rest ends up on the other end. Closing virt-manager does not help. Disconnecting and reconnecting using virsh console does not help. The only way to recover is to destroy the domain and then start the guest again and never start virt-manager. Note that the domain does not have VNC graphics so virt-manager defaults to try to access the serial port when started for a particular domain. Should there be locking within libvirt to only allow for a single client to access a specific serial port of a domain? Thanks, Dusty Mabe

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[libvirt-users] Console to RHEL6.1 container
by Sukadev Bhattiprolu 01 May '12

01 May '12

We are trying to create RHEL6.1 container and having trouble getting a proper console to the container. I have used lxc containers in the past and lxc has a script (lxc-fedora) to setup a basic Fedora container. Is there something similar or docs with virtmgr ? We started out making a copy of the root fs and using that copy as the root for the container. I made a couple of tweaks to the container rootfs: 1. ensured that /dev/ptmx is a symlink to pts/ptmx 2. Added 'newinstance' option to the devpts mount in fstab The container xml file is attached. If devpts entry in container's fstab has the 'newinstance' option, I get a brief "domain test01 started" message on the stdout. When I run 'virsh consle test01', I only see a few messages --- Setting hostname node03: [ OK ] Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems [ OK ] mount: can't find / in /etc/fstab or /etc/mtab Mounting local filesystems: [ OK ] Enabling local filesystem quotas: [ OK ] Enabling /etc/fstab swaps: [ OK ] --- and then a hang wihtout a shell. At ths point sshd or any of the other services don't appear to be running. If I remove the 'newinstance' entry in fstab and run 'virsh start test01' the container starts up ok. I get all "console" messages on whichever is my current /dev/pts/0 ! At this point sshd and many other services are running and I can ssh in. Even in this case, though 'virsh console test01' shows the same _few_ messages as above and no login shell. Back to the newinstance case, by putting some debug messages in the container's /etc/rc.sysinit, I see that devpts is already mounted with newinstance. With lxc, in setup_pts(), we unmount devpts in the container and then mount with newinstance. I wonder what that sequence is with virtmgr. I double checked that /dev/ptmx in container is a symlink to pts/ptmx and that CONFIG_DEVPTS_MULTIPLE_INSTANCES=y. Appreciate any tips on how I can get access to the console of the RHEL6.1 container. Suka Suka

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[libvirt-users] question of iSCSI pool on the same iSCSI target
by david_zhu 28 Apr '12

28 Apr '12

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[libvirt-users] Is there a way for telling libvirt to auto define an xml under /etc/libvirt/qemu?
by Raoul Scarazzini 26 Apr '12

26 Apr '12

Hi everybody, like in the subject: is there a way for telling libvirt to auto define an xml under /etc/libvirt/qemu? I mean, sometimes it happens to have the /etc/libvirt/qemu shared between nodes, say with a NFS share, since I can set a new xml on a node and I want o see the virtual machine on all the others, is there a way to automate this or am I obligated to launch virsh define <xml> on EACH node? Thank you so much, -- Raoul Scarazzini Solution Architect MMUL: Niente è impossibile da realizzare, se lo pensi bene! +39 3281776712 rasca(a)mmul.it http://www.mmul.it

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[libvirt-users] Installing the python libvirt bindings in a virtualenv
by Daniel Gonzalez 26 Apr '12

26 Apr '12

Hi, I have a virtualenv which I am using for production (I need python 2.7 and certain libraries which can not be easily installed on the host environment). Now I am trying to install also libvirt, but I have not succeeded yet. The problem that I have now looks quite difficult to solve. This is the script I am using to install libvirt (bash script): install_libvirt_ ( ) { local myvirtualenv="$1" local libvirt_tag=v0.9.9 cd $TMP_DIR git clone git://libvirt.org/libvirt.git cd libvirt git checkout $libvirt_tag mkdir -p $VIRTUALENVS_DIR/$myvirtualenv/usr sudo apt-get install autopoint # configure: error: You must install the GnuTLS library in order to compile and run libvirt sudo apt-get install -y gnutls-bin gnutls-dev # configure: error: You must install device-mapper-devel/libdevmapper >= 1.0.0 to compile libvirt sudo apt-get install -y libdevmapper-dev libdevmapper # configure: error: You must install python-devel to build Python bindings sudo apt-get install -y python-all-dev ./autogen.sh --prefix=$VIRTUALENVS_DIR/$myvirtualenv/usr --enable-compile-warnings=error make make install } But this is failing with error message: checking for python script directory... ${prefix}/lib/python2.7/site-packages checking for python extension module directory... ${exec_prefix}/lib/python2.7/site-packages configure: error: You must install python-devel to build Python bindings python-devel does not exist. I have used python-all-dev, but it has not solved the problem. Has somebody succeeded in installing libvirt-python inside a virtualenv? Thanks, Daniel Gonzalez

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[libvirt-users] Snapshot system: really confusing.
by NoxDaFox 25 Apr '12

25 Apr '12

Greetings, I am developing a platform for test and debug use. The typical scenario I want to realize is the following: I run a .qcow2 image via QEMU-KVM, the running OS is not relevant. I want to take several snapshots of both Disk and RAM status; same file, separate files doesn't matter. I just need a way to have consistent information about them (better with XML description) and the data as well. I want to store these snapshots on my storage devices to use them whenever and wherever I want. Is it possible to store a single snapshot providing both the memory and disks state in a file (maybe a .qcow2 file)? Is there any way to get a unique interface which handles my snapshots? I was used to use the virDomainSnapshotCreateXML() defining the destination file in the XML with <disk> fields. After updating libvirt it was not working anymore, I thought was a bug but then I realized it was intentional. The function complains about the fact that the <disk> parameter is not accepted anymore. So I started guessing how to solve reading the API documentation and I fall in a completely nebulous world. For what I got: - virDomainSnapshotCreateXML(): According to flags can take system checkpoints (really useful) and disks snapshots. System checkpoints: What I need but I didn't find any way to retrieve the storage file; I'm only able to get the snapshot pointer, quite useless as from its pointer I can only print the XML description. Disk snapshot: here through the XML description I can specify a target file where to write the information. But I still need the memory status. - virDomainSaveFlags(): No matter how I set the flags, it halts the guest; I need it still running afterward and I think that reverting the domain and restarting for my scenarios is unaffordable. - virDomainCoreDump(): Does what I need for the memory, but doesn't give any XML description and doesn't supply any useful interface to handle it, I just get back an int that represent the exit status of the routine. (other functions really similar) The question is: why all this confusion? I absolutely understand the problematic that realizing a multiplatform snapshots management raises; but I think that for an API purpose what is implemented here is completely confusing the developer. Regards, NoxDaFox.

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