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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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[libvirt-users] Non-Root not able to use openReadOnly()
by vipul borikar 24 Apr '12

24 Apr '12

Hi, I have a code : import libvirt con = libvirt.openReadOnly(None) print con.listDomainsID() When i run the above code using root i get the proper output... but when i use non-root user it givers be a empty list [ ] If i change the 2nd line to con = libvirt.open(qemu:///system) It works. I am using RHEL 6.1 with default kvm and libvirt. unix_sock_group = "virt" in libvirtd.conf where virt is a group of non-root user group = "virt" in qemu.conf is set. Any Ideas???? -- Thanks Vipul Borikar "Our task must be to free ourselves...by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty."

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[libvirt-users] Creating Domain and moving a kvm disk under libvirt control
by James Allsopp 20 Apr '12

20 Apr '12

Hi, I'm trying to start using libvirt on my debian machine, but am having some issues. Regardless of using command-line or gui interface with virt-manager, building the virtual machine stalls on 0 with no indication of why it has stopped working. How do I go about fixing this or diagnosing this problem. Also I've a .img file that work s with KVM, would there be anyway to import it for use with libvirt? Thanks James

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[libvirt-users] Using Sys::Virt with Libvirt
by John Wayne 20 Apr '12

20 Apr '12

Anyone using Sys::Virt CPAN Perl Module with Libvirt? I am unable to install Sys::Virt using cpan, Sys::Virt cannot find Libvirt, even though I have it installed. I tried setting LD_LIBRARY_PATH and also PKG_CONFIG_PATH to point to Libvirt, and in both case Sys::Virt was not able to find Libvirt. During installation Sys::Virt times out with : Sys-Virt-0.9.4/INSTALL CPAN: File::Temp loaded ok (v0.22) CPAN.pm: Going to build D/DA/DANBERR/Sys-Virt-0.9.4.tar.gz libvirt >= 0.9.4 is required Warning: No success on command[/usr/bin/perl Makefile.PL INSTALLDIRS=site] Warning (usually harmless): 'YAML' not installed, will not store persistent state DANBERR/Sys-Virt-0.9.4.tar.gz /usr/bin/perl Makefile.PL INSTALLDIRS=site -- NOT OK Running make test Make had some problems, won't test Running make install Make had some problems, won't install Could not read '/root/.cpan/build/Sys-Virt-0.9.4-DiRtOZ/META.yml'. Falling back to other methods to determine prerequisites Failed during this command: DANBERR/Sys-Virt-0.9.4.tar.gz : writemakefile NO '/usr/bin/perl Makefile.PL INSTALLDIRS=site' returned status 256 I have tried with both Libvirt 0.9.11 and Sys::Virt 0.9.11 in addition to Libvirt 0.9.4 with Sys::Virt 0.9.4. Thanks

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[libvirt-users] Error on running libvirt (dnsmasq)
by John Wayne 20 Apr '12

20 Apr '12

Hi, I am running libvirt on RHEL 6.2 and getting this below error when I start the daemon: /usr/sbin/libvirtd --verbose 2012-04-20 06:00:13.366+0000: 26900: info : libvirt version: 0.9.11 2012-04-20 06:00:13.366+0000: 26900: error : virExecWithHook:424 : Cannot find 'dnsmasq' in path: No such file or directory 2012-04-20 06:00:13.405+0000: 26900: warning : ebiptablesDriverInit:4066 : Could not find 'ebtables' executable 2012-04-20 06:00:13.419+0000: 26900: error : virCommandWait:2306 : internal error Child process (/bin/sh -c IPT=/sbin/ip6tables cmd='$IPT -n -L FORWARD' eval res=\$$"${cmd} 2>&1"$ if [ $? -ne 0 ]; then echo "Failure to execute command '${cmd}' : '${res}'."; exit 1;fi ) status unexpected: exit status 1 2012-04-20 06:00:13.419+0000: 26900: error : ebiptablesDriverInit:4101 : Testing of ip6tables command failed: Failure to execute command '$IPT -n -L FORWARD' : 'WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/. ip6tables v1.4.7: can't initialize ip6tables table `filter': Address family not supported by protocol Perhaps ip6tables or your kernel needs to be upgraded.'. I compiled libvirt from the source, do I really need dnsmasq? Thanks

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[libvirt-users] Building an RPM
by John Wayne 20 Apr '12

20 Apr '12

Hi, I have downloaded libvirt-0.9.11 and compiled it on my RHEL 6.2 system. I am trying to build a binary RPM for distribution, I am not sure what the best way to go about doing this is. http://libvirt.org/FAQ.html suggests that I try 'make rpm', however that ends in the below error: missing XHTML1 DTD cp: cannot stat `./api.html': No such file or directory make[2]: *** [distdir] Error 1 rm news.html.tmp goals.html.tmp archnetwork.html.tmp formatsecret.html.tmp drvopenvz.html.tmp windows.html.tmp testtck.html.tmp drvlxc.html.tmp apps.html.tmp docs.html.tmp formatstorageencryption.html.tmp drvvbox.html.tmp formatdomain.html.tmp php.html.tmp drvhyperv.html.tmp errors.html.tmp hacking.html.tmp format.html.tmp hooks.html.tmp api.html.tmp storage.html.tmp formatcaps.html.tmp relatedlinks.html.tmp compiling.html.tmp index.html.tmp archdomain.html.tmp downloads.html.tmp auth.html.tmp archnode.html.tmp hvsupport.html.tmp bugs.html.tmp java.html.tmp locking.html.tmp logging.html.tmp testapi.html.tmp formatnetwork.html.tmp bindings.html.tmp uri.html.tmp drvtest.html.tmp sitemap.html.tmp drvqemu.html.tmp contact.html.tmp formatnwfilter.html.tmp intro.html.tmp drvxen.html.tmp drvesx.html.tmp drvvmware.html.tmp testsuites.html.tmp devguide.html.tmp firewall.html.tmp architecture.html.tmp migration.html.tmp todo.html.tmp formatsnapshot.html.tmp formatstorage.html.tmp internals.html.tmp deployment.html.tmp api_extension.html.tmp drvuml.html.tmp virshcmdref.html.tmp csharp.html.tmp python.html.tmp drvremote.html.tmp archstorage.html.tmp remote.html.tmp drivers.html.tmp formatnode.html.tmp make[2]: Leaving directory `/home/user/libvirt-0.9.11/docs' make[1]: *** [distdir] Error 1 make[1]: Leaving directory `/home/user/libvirt-0.9.11' make: *** [rpm] Error 2 Any clue on how to proceed? I am not sure why api.html is missing, since this is a clean untar of the 0.9.11 tar file, and './configure;make;make install' all worked without any issues. Thanks!

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[libvirt-users] Thread-safety issues with vbox driver ?
by Jean-Baptiste Rouault 19 Apr '12

19 Apr '12

Hi, I'm experiencing weird things with the vbox driver when using multiple threads. Following is the snippet of code I experience problems with /*****************************************************/ #include <stdlib.h> #include <stdio.h> #include <pthread.h> #include <libvirt/libvirt.h> void *create_and_destroy(void *arg) { virDomainPtr dom = (virDomainPtr)arg; char buf[VIR_UUID_STRING_BUFLEN]; virDomainGetUUIDString(dom, buf); if (virDomainCreate(dom) != 0) { printf("failed to start %s\n", buf); goto end; } printf("%s started\n", buf); if (virDomainDestroy(dom) != 0) { printf("failed to destroy %s\n", buf); } printf("%s destroyed\n", buf); end: virDomainFree(dom); pthread_exit(NULL); } int main(int argc, char **argv) { virConnectPtr conn = virConnectOpen("vbox:///session"); int i; int count = virConnectNumOfDefinedDomains(conn); char **names = malloc(count * sizeof(char *)); virConnectListDefinedDomains(conn, names, count); virDomainPtr *doms = malloc(count * sizeof(virDomainPtr)); for (i = 0 ; i < count ; ++i) { doms[i] = virDomainLookupByName(conn, names[i]); } pthread_t *threads = malloc(count * sizeof(pthread_t)); pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); for (i = 0 ; i < count ; ++i) { pthread_create(&threads[i], &attr, create_and_destroy, (void *)doms[i]); } pthread_attr_destroy(&attr); for (i = 0 ; i < count ; ++i) { pthread_join(threads[i], NULL); } virConnectClose(conn); pthread_exit(NULL); } /************************************************/ Here is the output of the program with 2 defined domains: > libvir: VBOX error : operation failed: OpenRemoteSession/LaunchVMProcess failed, domain can't be started > failed to start c538c89a-70da-42ab-a88a-5aeb15698c12 > 034cf837-abe7-4c48-8373-0ddcf480d416 started > 034cf837-abe7-4c48-8373-0ddcf480d416 destroyed Sometimes the first domain really fails to start, but sometimes it starts correctly but libvirt reports an error. Sometimes domains aren't destroyed but libvirt reports no error at all. If there is only one domain, no problem occurs at all. I also tried the same code (ie with multiple domains) but with only one thread and it works well. I managed to reproduce these issues with libvirt 0.9.4, 0.9.7, using VirtualBox 4.0 and 4.1. -- Jean-Baptiste ROUAULT Ingénieur R&D - diateam : Architectes de l'information Phone : +33 (0)9 53 16 02 70 Fax : +33 (0)2 98 050 051

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[libvirt-users] USB Passthrough of two identical devices
by Hendrik Friedel 19 Apr '12

19 Apr '12

Hello, I re-post my question from some days ago, as I got no reply.. Please let me know, if my question is unclear, or if I can do anything to make answering it easier. I appreciate your help. Greetings, Hendrik Hello, I'd like to pass throug two identical devices to my VM. (using libvirt, guest is debian). For one device, it works like this: <hostdev mode='subsystem' type='usb'> <source> <vendor id='0x4fa'/> <product id='0x2490'/> </source> <boot order='2'/> </hostdev> But now, I have another device just like this one: Bus 001 Device 007: ID 04fa:2490 Dallas Semiconductor DS1490F 2-in-1 Fob, 1-Wire adapter Bus 001 Device 005: ID 04fa:2490 Dallas Semiconductor DS1490F 2-in-1 Fob, 1-Wire adapter Unfortunately, only one of these two devices appears for the Guest, even if I duplicate the above entry. Now, there's this option to pass devices: <address bus='0x06' device='0x02''/> But the Bus/Device can/might change... Maybe this can be overcome by udev (and maybe this is the default in ubuntu? can someone confirm?) I have tried the latter syntax aswell. Here the log-file: Code: LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc -cpu qemu32 -enable-kvm -m 256 -smp 1 -name WG -uuid fd90f0d6-122c-992f-a399-4105ee30d6e3 -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/WG.monitor,server,nowait -monitor chardev:monitor -boot c -drive file=/var/lib/zentyal/machines/WG/WG-Test.qcow2,if=scsi,index=0,boot=on,format=qcow2 -net nic,macaddr=00:16:3e:5d:c7:9e,vlan=0,name=nic.0 -net tap,fd=29,vlan=0,name=tap.0 -serial none -parallel none -usb -usbdevice mouse -vnc 0.0.0.0:0,password -k de -vga cirrus -usbdevice host:04fa:2490 -usbdevice host:04fa:2490 usb_create: no bus specified, using "usb.0" for "usb-host" husb: open device 1.5 husb: config #1 need -1 husb: 1 interfaces claimed for configuration 1 husb: grabbed usb device 1.5 usb_create: no bus specified, using "usb.0" for "usb-host" What's odd in this: -usbdevice host:04fa:2490 -usbdevice host:04fa:2490 And this, although I had used the bus/device syntax... So, what would you recommend? Regards, Hendrik

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[libvirt-users] CfP 7th Workshop on Virtualization in High-Performance Cloud Computing (VHPC'12)
by VHPC 12 19 Apr '12

19 Apr '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: Rolling abstract submission June 4, 2012 - Full paper submission 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 4, 2012 - Full paper submission 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] Problems using latest qemu-kvm and latest libvirt ( hvm missing )
by Bhasker C V 18 Apr '12

18 Apr '12

Hi all I have faced this issue already and the solution was to go back to a old version of qemu-kvm and/or libvirt and things start falling into place but this time I would want to solve this. I have used these versions as per the o/p of the commands below. To jumpstart a new machine which is libvirt capable, it always is a hastle to find out which of the version combination of libvirt,qemu-kvm will work. Just by picking the latest of the two versions does not help and ends up not supporting hvm at all $ sudo virsh capabilities <capabilities> <host> <uuid>34373030-3635-435a-4a32-313230485156</uuid> <cpu> <arch>x86_64</arch> <model>Westmere</model> <vendor>Intel</vendor> <topology sockets='2' cores='4' threads='2'/> <feature name='rdtscp'/> <feature name='pdpe1gb'/> <feature name='dca'/> <feature name='pdcm'/> <feature name='xtpr'/> <feature name='tm2'/> <feature name='est'/> <feature name='smx'/> <feature name='vmx'/> <feature name='ds_cpl'/> <feature name='monitor'/> <feature name='dtes64'/> <feature name='pclmuldq'/> <feature name='pbe'/> <feature name='tm'/> <feature name='ht'/> <feature name='ss'/> <feature name='acpi'/> <feature name='ds'/> <feature name='vme'/> </cpu> <power_management/> <migration_features> <live/> <uri_transports> <uri_transport>tcp</uri_transport> </uri_transports> </migration_features> </host> </capabilities> $ virsh --version 0.9.11 $ qemu-system-x86_64 --version QEMU emulator version 1.0,1 (qemu-kvm-1.0.1), Copyright (c) 2003-2008 Fabrice Bellard $ sudo virsh uri qemu:///system $ sudo virsh version Compiled against library: libvir 0.9.11 Using library: libvir 0.9.11 Using API: QEMU 0.9.11 error: failed to get the hypervisor version error: internal error Cannot find suitable emulator for x86_64 $ which kvm /usr/local/bin/kvm Can someone tell me, please, what is the version of qemu-kvm which will work well with the latest libvirt 0.9.11 ? since clearly the latest versions of qemu-kvm and libvirt are not compatible fully (atleast not hvm). Even better if this is documented somewhere visible so that a lot of time can be saved in iterating through the versions of qemu-kvm to find out which one will work. -- Bhasker C V Secure Mails: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4D05FEEC54E47413

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