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[libvirt-users] How to run qemu with root permission from libvirt.
by Edward Young 15 Mar '15

15 Mar '15

Hi all, My platform is qemu 1.5.1 and libvirt 1.2.0. How to lauch the qemu with root permission, since in the qemu I would like to access the hardware directly. I actually check the runing /usr/bin/kvm process, it indicated that this process is from a root user, but it still failed to act as with root permission. Thanks! Ed

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[libvirt-users] lxc-enter-namespace support in Python API
by Florian Haas 13 Mar '15

13 Mar '15

Hello everyone, referring back to https://www.redhat.com/archives/libvirt-users/2013-August/msg00107.html, in which a user discovered that there is no equivalent to "virsh -c lxc:/// lxc-enter-namespace" in the Python API. Has that ever changed? In that thread Daniel suggested that the user file a bug, but that apparently never happened. Why am I interested in this? Ansible currently supports a somewhat limited libvirt_lxc connection driver which uses lxc-enter-namespace to access LXC containers without SSH (https://github.com/ansible/ansible/blob/devel/lib/ansible/runner/connection…) That connection driver, written in Python like the rest of Ansible, currently has to use jump through subprocess hoops with virsh to enter the namespace, which is slow and doesn't support pipelining. Being able to use the native Python API would help greatly. In addition, if it were to use the Python API instead, the connection plugin could also be extended to use lxc+ssh:// connection types so Ansible users could potentially manage container hosts _and_ all their containers from a single playbook, just so long as they have SSH access to the host. Does anyone know whether that extension of the API is being / has been addressed? Cheers, Florian

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[libvirt-users] lxc-enter-namespace support in Python API
by Florian Haas 13 Mar '15

13 Mar '15

Hello everyone, referring back to https://www.redhat.com/archives/libvirt-users/2013-August/msg00107.html, in which a user discovered that there is no equivalent to "virsh -c lxc:/// lxc-enter-namespace" in the Python API. Has that ever changed? In that thread Daniel suggested that the user file a bug, but that apparently never happened. Why am I interested in this? Ansible currently supports a somewhat limited libvirt_lxc connection driver which uses lxc-enter-namespace to access LXC containers without SSH (https://github.com/ansible/ansible/blob/devel/lib/ansible/runner/connection…) That connection driver, written in Python like the rest of Ansible, currently has to use jump through subprocess hoops with virsh to enter the namespace, which is slow and doesn't support pipelining. Being able to use the native Python API would help greatly. In addition, if it were to use the Python API instead, the connection plugin could also be extended to use lxc+ssh:// connection types so Ansible users could potentially manage container hosts _and_ all their containers from a single playbook, just so long as they have SSH access to the host. Does anyone know whether that extension of the API is being / has been addressed? Cheers, Florian

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[libvirt-users] vm live storage migration failure.
by Edward Young 11 Mar '15

11 Mar '15

Hi all, When I migrate a live vm with two virtual disk images from one node to another. Bothe of the nodes are in the same LAN and there is no shared storage. I run the following command and get the output blew: yyang@node1:~$ sudo virsh migrate --live --persistent --copy-storage-all --unsafe --verbose vm1 qemu+ssh://192.168.1.3/system root(a)192.168.1.3's password: root(a)192.168.1.3's password: root(a)192.168.1.3's password: error: Cannot recv data: Permission denied, please try again. Permission denied, please try again. Permission denied (publickey,password).: Connection reset by peer I'm sure the root passwd I entered is correct. And When I run the following command, it works. I can use qemu+ssh to connect to a remote libvirtd daemon. yyang@node2:~$ sudo virsh Welcome to virsh, the virtualization interactive terminal. Type: 'help' for help with commands 'quit' to quit virsh # connect qemu+ssh://192.168.1.2/system root(a)192.168.1.2's password: virsh # list Id Name State ---------------------------------------------------- 6 vm1 running 7 vm2 running virsh # Any suggestions about this issue? Thanks a lot! Ed

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[libvirt-users] CfP 10th Workshop on Virtualization in High-Performance Cloud Computing (VHPC '15)
by VHPC 15 11 Mar '15

11 Mar '15

================================================================= CALL FOR PAPERS 10th Workshop on Virtualization in High-Performance Cloud Computing (VHPC '15) held in conjunction with Euro-Par 2015, August 24-28, Vienna, Austria (Springer LNCS) ================================================================= Date: August 25, 2015 Workshop URL: http://vhpc.org Paper Submission Deadline: May 22, 2015 CALL FOR PAPERS Virtualization technologies constitute a key enabling factor for flexible resource management in modern data centers, cloud environments, and increasingly in HPC as well. Providers need to dynamically manage complex infrastructures in a seamless fashion for varying workloads and hosted applications, independently of the customers deploying software or users submitting highly dynamic and heterogeneous workloads. Thanks to virtualization, we have the ability to manage vast computing and networking resources dynamically and close to the marginal cost of providing the services, which is unprecedented in the history of scientific and commercial computing. Various virtualization technologies contribute to the overall picture in different ways: machine virtualization, with its capability to enable consolidation of multiple under-utilized servers with heterogeneous software and operating systems (OSes), and its capability to live-migrate a fully operating virtual machine (VM) with a very short downtime, enables novel and dynamic ways to manage physical servers; OS-level virtualization, with its capability to isolate multiple user-space environments and to allow for their co-existence within the same OS kernel, promises to provide many of the advantages of machine virtualization with high levels of responsiveness and performance; I/O Virtualization allows physical network adapters to take traffic from multiple VMs; network virtualization, with its capability to create logical network overlays that are independent of the underlying physical topology and IP addressing, provides the fundamental ground on top of which evolved network services can be realized with an unprecedented level of dynamicity and flexibility; These technologies have to be inter-mixed and integrated in an intelligent way, to support workloads that are increasingly demanding in terms of absolute performance, responsiveness and interactivity, and have to respect well-specified Service- Level Agreements (SLAs), as needed for industrial-grade provided services. Indeed, among emerging and increasingly interesting application domains for virtualization, we can find big-data application workloads in cloud infrastructures, interactive and real-time multimedia services in the cloud, including real-time big-data streaming platforms such as used in real-time analytics supporting nowadays a plethora of application domains. Distributed cloud infrastructures promise to offer unprecedented responsiveness levels for hosted applications, but that is only possible if the underlying virtualization technologies can overcome most of the latency impairments typical of current virtualized infrastructures (e.g., far worse tail-latency). The Workshop on Virtualization in High-Performance Cloud Computing (VHPC) aims to bring together researchers and industrial practitioners facing the challenges posed by virtualization in order to foster discussion, collaboration, mutual exchange of knowledge and experience, enabling research to ultimately provide novel solutions for virtualized computing systems of tomorrow. The workshop will be one day in length, composed of 20 min paper presentations, each followed by 10 min discussion sections, and lightning talks, limited to 5 minutes. Presentations may be accompanied by interactive demonstrations. TOPICS Topics of interest include, but are not limited to: - Virtualization in supercomputing environments, HPC clusters, cloud HPC and grids - Optimizations of virtual machine monitor platforms, hypervisors and OS-level virtualization - Hypervisor and network virtualization QoS and SLAs - Cloud based network and system management for SDN and NFV - Management, deployment and monitoring of virtualized environments - Performance measurement, modelling and monitoring of virtualized/cloud workloads - Programming models for virtualized environments - Cloud reliability, fault-tolerance, high-availability and security - Heterogeneous virtualized environments, virtualized accelerators, GPUs and co-processors - Optimized communication libraries/protocols in the cloud and for HPC in the cloud - Topology management and optimization for distributed virtualized applications - Cluster provisioning in the cloud and cloud bursting - Adaptation of emerging HPC technologies (high performance networks, RDMA, etc..) - I/O and storage virtualization, virtualization aware file systems - Job scheduling/control/policy in virtualized environments - Checkpointing and migration of VM-based large compute jobs - Cloud frameworks and APIs - Energy-efficient / power-aware virtualization Important Dates April 29, 2015 - Abstract registration May 22, 2015 - Full paper submission June 19, 2014 - Acceptance notification October 2, 2014 - Camera-ready version due August 25, 2014 - Workshop Date TPC CHAIR Michael Alexander (chair), TU Wien, Austria Anastassios Nanos (co-chair), NTUA, Greece Balazs Gerofi (co-chair), RIKEN Advanced Institute for Computational Science, Japan PROGRAM COMMITTEE Stergios Anastasiadis, University of Ioannina, Greece Costas Bekas, IBM Zurich Research Laboratory, Switzerland Jakob Blomer, CERN Ron Brightwell, Sandia National Laboratories, USA Roberto Canonico, University of Napoli Federico II, Italy Julian Chesterfield, OnApp, UK Patrick Dreher, MIT, USA William Gardner, University of Guelph, Canada Kyle Hale, Northwestern University, USA Marcus Hardt, Karlsruhe Institute of Technology, Germany Iftekhar Hussain, Infinera, USA Krishna Kant, Temple University, USA Eiji Kawai, National Institute of Information and Communications Technology, Japan Romeo Kinzler, IBM, Switzerland Kornilios Kourtis, ETH, Switzerland Nectarios Koziris, National Technical University of Athens, Greece Massimo Lamanna, CERN Che-Rung Roger Lee, National Tsing Hua University, Taiwan Helge Meinhard, CERN Jean-Marc Menaud, Ecole des Mines de Nantes France Christine Morin, INRIA, France Amer Qouneh, University of Florida, USA Seetharami Seelam, IBM Watson Research Center, USA Josh Simons, VMWare, USA Borja Sotomayor, University of Chicago, USA Kurt Tutschku, Blekinge Institute of Technology, Sweden Yasuhiro Watashiba, Osaka University, Japan Chao-Tung Yang, Tunghai University, Taiwan PAPER SUBMISSION-PUBLICATION 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 Submission Link: https://easychair.org/conferences/?conf=europar2015ws GENERAL INFORMATION The workshop is one day in length and will be held in conjunction with Euro-Par 2015, 24-28 August, Vienna, Austria

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[libvirt-users] Issues with XML validation after upgrade to 1.2.12
by Brian Rak 11 Mar '15

11 Mar '15

After we upgraded to 1.2.12, we've been having issues with libvirt... it complains that our formerly valid guest definitions are now invalid: error: Failed to start domain XXXX error: internal error: Cannot instantiate filter due to unresolvable variables or unavailable list elements: DHCPSERVER We looked into this, and found that it's the XML validation that's failing: # xmllint --noout --relaxng "/share/libvirt/schemas/domain.rng" XXXX.xml --recover Relax-NG validity error : Extra element devices in interleave test.xml:1: element domain: Relax-NG validity error : Element domain failed to validate content test.xml fails to validate And, a minimal domain XML to reproduce it (this won't boot, but it shows the issue): <domain type='kvm' id='65'> <name>XXXX</name> <uuid>b602b5f2-b9d7-43bd-a949-acc7eeeb9f8f</uuid> <memory unit='KiB'>1048576</memory> <devices> <interface type='bridge'> <filterref filter='myfilter'> <parameter name='CTRL_IP_LEARNING' value='none'/> <parameter name='DHCPSERVER' value='104.156.226.10'/> <parameter name='IP' value='104.207.129.11'/> <parameter name='IP6_ADDR' value='2001:19f0:300:2102::'/> <parameter name='IP6_MASK' value='64'/> </filterref> </interface> </devices> </domain> The cause seems to be having multiple parameters in a <filterref> block. We applied the following patch to fix it: diff -ur src_clean/docs/schemas/domaincommon.rng src/docs/schemas/domaincommon.rng --- src_clean/docs/schemas/domaincommon.rng 2015-01-23 06:46:24.000000000 -0500 +++ src/docs/schemas/domaincommon.rng 2015-03-10 11:30:42.057441342 -0400 @@ -4468,6 +4468,7 @@ <data type="NCName"/> </attribute> <optional> + <zeroOrMore> <element name="parameter"> <attribute name="name"> <ref name="filter-param-name"/> @@ -4476,6 +4477,7 @@ <ref name="filter-param-value"/> </attribute> </element> + </zeroOrMore> </optional> </define>

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[libvirt-users] Unable to start sandbox: Kernel module dir /lib/modules/3.18.5-x86_64-linode52/kernel does not exist
by Adam Smith 09 Mar '15

09 Mar '15

Dear all, I have been trying to set up the set up Libvirt Sandbox without success. I want to use virt-sandbox in order to run untrusted programs in a secure environment. I am had no knowledge about virtualization until a couple of days ago, so I am probably doing something wrong. The scenario is the following: Linode instance. OS that I have tried: Ubuntu 14.04, Ubuntu 14, Fedora 21. Both compiling from source and installing the pre-compiled packages. But I always reach the same error: """ $ virt-sandbox -c qemu:///session /bin/date Unable to start sandbox: Kernel module dir /lib/modules/3.18.5-x86_64-linode52/kernel does not exist """ I have been told by the guys of Linode that: "The kernels we use are completely compiled and do not utilize modules. In addition, the kernels are loaded from the host rather than the /boot directory" Any hints to solve this issue? Is the only solution to compile my own kernel? Also, if I decide to use a service like Linode, AWS, Digital Ocean...then the server that I would be using would be already a virtual server. Is it a problem to run virt-sandbox within a server which is already a virtual server? Thanks a lot!

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[libvirt-users] Hyper-V 2008 R2 support ?
by Jean-François FILIPPI 09 Mar '15

09 Mar '15

Hi, I'm trying libvirt to connect to Hyper-V servers. It works fine for Hyper-V 2012 servers, however it doesn't work for Hyper-V 2008 R2 (the exact error is | Call to virConnectOpenAuth failed: internal error: Transport error during enumeration: Could not connect (7) (Libvirt::ConnectionError)|.). I'm using the code provided by libvirt documentation (http://libvirt.org/ruby/examples/open_auth.rb) and have authorized basic auth plus unencrypted connection on both 2008 R2 & 2012 servers (http://libvirt.org/drvhyperv.html#auth) Surfing the Internet to find some solutions, I found this (https://www.redhat.com/archives/libvir-list/2014-April/msg00802.html) where a developer talks about stopping 2008 R2 support (because of some technical stuff), while in the documentation (http://libvirt.org/drvhyperv.html) it is explicitely said to be supporting 2008 R2. My question is : does the support has been stopped or does the code to connect to a 2008 R2 server is different from the 2012 server ? I'm using libvirt 1.2.2 and ruby-libvirt 1.2.2. Thanks for your help, Jean-François FILPPI

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[libvirt-users] ANNOUNCE: Oz 0.13.0 release
by Chris Lalancette 08 Mar '15

08 Mar '15

All, I'm pleased to announce release 0.13.0 of Oz. Oz is a program for doing automated installation of guest operating systems with limited input from the user. Release 0.13.0 is a bugfix and feature release for Oz. Some of the highlights between Oz 0.12.0 and 0.13.0 are: - For Fedora, if the user specifies a version, but that isn't supported yet, try the last supported version (in this case), as that will often work. - Fix a regression where we forgot to force the qcow2 image type - Allow installs that use more than one installation device - Add support for RHEL 6.5 - Rename OEL-6 to OL-6 - Add support for Ubuntu 14.04 - Add Windows 8.1 support - Add CentOS-7 support - Add the ability to specify kernel parameters in the TDL - Make sure to remove dhcp leases from guests after the install - Fix support for FreeBSD - Add in support for TDL "precommands"; these are commands that are run *before* package installation - Fix up file locking - Add support for RHEL 5.11 - Remove Ubuntu ssh keys at the end of installation - Add support for Ubuntu 14.10 - Add support for XInclude, for merging various TDLs together - Add Fedora 21 support - Add support for ppc64 and ppc64le A tarball and zipfile of this release is available on the Github releases page: https://github.com/clalancette/oz/releases . Packages for Fedora-20, Fedora-21, Fedora-22, EPEL-6, and EPEL-7 have been built in Koji and will eventually make their way to stable. Instructions on how to get and use Oz are available at http://github.com/clalancette/oz/wiki . If you have questions or comments about Oz, please feel free to contact me at clalancette at gmail.com, or open up an issue on the github page: http://github.com/clalancette/oz/issues . Thanks to everyone who contributed to this release through bug reports, patches, and suggestions for improvement. Chris Lalancette

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[libvirt-users] live migration - qemu hook
by Martin Klepáč 05 Mar '15

05 Mar '15

Hi, I am using qemu hook script to track status of VM live migration - libvirt 1.2.9 as included in Debian Wheezy backports. I would like to be informed of the fact that VM migration has successfully finished as soon as possible. Based on the steps below, when would that be possible? Sample VM migration as detected by qemu hook script: 1.) Destination hypervisor: [10:27:42.224] Args: one-16 migrate begin 2.) Destination hypervisor: [10:27:42.253] Args: one-16 prepare begin 3.) Destination hypervisor: [10:27:42.472] Args: one-16 start begin 4.) Destination hypervisor: [10:27:42.890] Args: one-16 started begin 5.) Actual VM migration...takes approximately 10 seconds in this case. 6.) Source hypervisor: [10:27:51.847] Args: one-16 stopped end 7.) Source hypervisor: [10:27:51.882] Args: one-16 release end Based on the website, "Unless an error occurs during the migration process, the *qemu* hook script on the *source* host is then executed with the "stopped" and "release" operations to indicate it is no longer running on this host." So the source hypervisor in steps no. 6 and 7 knows that it is no longer running a VM, right? Does that mean that the destination hypervisor is already running the VM at the moment corresponding to step no. 6? If so, is there any hook on the destination hypervisor, which would inform of the fact that the hypervisor has copied the last portions of VM memory and has become responsible for the VM in question? Thank you, Martin

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