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[libvirt-users] Pre-requisites to use Java bindings with QEMU
by Lior Vernia 15 May '13

15 May '13

Hello everyone, I've been reading through the articles on the website trying to understand what's needed to use the libvirt Java bindings with a QEMU hypervisor, but still have some uncertainties/questions: 1. It is my understanding that libvirtd has to be running on the machine hosting the hypervisor. Correct? 2. For libvirtd to communicate with QEMU, QEMU has to be installed on the machine hosting the hypervisor. Correct? I guess what I'm really asking is whether the libvirt QEMU "driver" includes the QEMU source code, or rather communicates with pre-installed executables. 3. Assuming the answer to the two former questions is "yes", is there a way to bypass libvirtd if the machine hosting the hypervisor is the same as the one running the Java code? I'm asking because running libvirtd would require privileged permissions, whereas QEMU itself can run with normal user permissions. Is that a price I have to pay for the uniform interface that libvirt presents? Yours, Lior.

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[libvirt-users] Designing libvirt client
by arvind viswanathan 15 May '13

15 May '13

Hi, I have a VMM application using a homegrown client for communicating with hypervisor. I am planning to migrate to libvirt because of the blocking nature of the calls. After going over the architecture, I would like to have a few doubts clarified 1) Should my application be necessarily multi-threaded in order to make use of the non-blocking calls in libvirt. [Are overlapping methods mainly used by multithreaded clients]. 2) I was wondering if there was any way to provide a callback along with the methods to achieve non-blocking.[My application has event library so it can receive events] 3) Is the libvirt RPC client multi-threaded. [i.e., does it internally use multiple threads to dispatch requests to server and return response to the application] I can provide more information, if its not helpful. Thanks Arvind

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[libvirt-users] convert only partition instead of whole disk (virt-p2v)
by hamelj＠web.de 15 May '13

15 May '13

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[libvirt-users] Error while compiling libvirt-1.0.5
by Javi Legido 14 May '13

14 May '13

Hi all. I'm trying to compile libvirt-1.0.5 on a Debian 6.0, but I get an error after "./configure" and then "make". Info: ... CCLD libvirt_parthelper libvirt_parthelper-parthelper.o: In function `main': /usr/local/src/libvirt-1.0.5/src/storage/parthelper.c:102: undefined reference to `ped_device_get' /usr/local/src/libvirt-1.0.5/src/storage/parthelper.c:116: undefined reference to `ped_disk_new' /usr/local/src/libvirt-1.0.5/src/storage/parthelper.c:122: undefined reference to `ped_disk_next_partition' /usr/local/src/libvirt-1.0.5/src/storage/parthelper.c:174: undefined reference to `ped_disk_next_partition' collect2: ld returned 1 exit status make[3]: *** [libvirt_parthelper] Error 1 make[3]: Leaving directory `/usr/local/src/libvirt-1.0.5/src' make[2]: *** [all] Error 2 make[2]: Leaving directory `/usr/local/src/libvirt-1.0.5/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/usr/local/src/libvirt-1.0.5' make: *** [all] Error 2 ---- $ sudo dpkg -l | grep parted ii libparted0-dev 2.3-5 The GNU Parted disk partitioning library development files ii libparted0debian1 2.3-5 The GNU Parted disk partitioning shared library ii libparted0debian1-dbg 2.3-5 The GNU Parted disk partitioning library debug development files ii parted 2.3-5 The GNU Parted disk partition resizing program Can somebody please help? Thanks

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[libvirt-users] Unable to start LXC on Gentoo w/ libvirt 1.0.4 or 1.0.5. 1.0.3 works
by Dennis Jenkins 14 May '13

14 May '13

Hello. I use libvirtd on my Gentoo development system to manage both QEMU and LXC. When 1.0.3 came out, I updated to it from 1.0.3-r2, but 1.0.4 failed to start my LXC containers. I did not research the issue at the time, so I revert to 1.0.3-r2. Today I updated to 1.0.5 and my LXC containers still fail to start. I have not changed my domain XML at all. I am looking for suggestions on what to try to resolve the problem. Maybe I'm missing a package or have something mus-configured for libvirt-1.0.5. btw, A month ago I updates to the most recent "udev" (udev-200). This required me to rename all of my network interfaces. My QEMU and LXC containers continued to work. All of my VMs use bridged networking on "br0" or "br1". Those virtual interfaces are not bridged to any physical NIC. They exist only inside my host's kernel. I have extensive iptables rules to filter traffic between my network segments (physical + virtual). TL;DR: this was burried in a log file: " error : lxcContainerMountFSDevPTS:808 : Failed to mount /.oldroot//var/run/libvirt/lxc/dwj-lnx-dev.devpts on /dev/pts: No such file or directory". But that directory DOES exist in the container: ostara ~ # ls -ld /vm/lxc/dwj-lnx-dev/dev/pts/ drwxr-xr-x 2 root root 4096 Apr 27 2011 /vm/lxc/dwj-lnx-dev/dev/pts/ If I revert to libvirt-1.0.3-r2, I can boot my LXC containers again. But if possible, I'd like to keep my system current. I've ran the usual Gentoo tools to verify that all package dependencies are installed, revdep-rebuild reports that all ELFs link against the proper shared objects. ostara ~ # virsh --version 1.0.5 ostara ~ # equery l libvirt * Searching for libvirt ... [IP-] [ ] app-emulation/libvirt-1.0.5:0 ostara ~ # equery -q u libvirt | xargs echo -audit -avahi +caps -firewalld -fuse -iscsi +libvirtd +lvm +lxc +macvtap +nfs +nls -numa -openvz -parted +pcap -phyp -policykit -python +qemu -rbd +sasl +udev +uml +vepa +virt-network -virtualbox -xen ostara ~ # virsh -c lxc:/// list --all Id Name State ---------------------------------------------------- - dwj-lnx-dev shut off - vm1 shut off ostara ~ # virsh -c lxc:/// start dwj-lnx-dev error: Failed to start domain dwj-lnx-dev error: internal error guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=fbcd8c3a-9939-12b4-727d-5d3526bc448f LIBVIRT_LXC_UUID=fbcd8c3a-9939-12b4-727d-5d3526bc448f LIBVIRT_LXC_NAME=dwj-lnx-dev /sbin/init error receiving signal from container: Input/output error ostara ~ # tail -n 10 /var/log/libvirt/libvirtd.log 2013-05-14 13:03:47.549+0000: 22352: info : libvirt version: 1.0.5 2013-05-14 13:03:47.549+0000: 22352: error : virDBusGetSystemBus:86 : internal error Unable to get DBus system bus connection: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory 2013-05-14 13:03:47.549+0000: 22352: warning : ebiptablesDriverInitCLITools:4233 : Could not find 'ip6tables' executable 2013-05-14 13:04:21.629+0000: 22341: error : virNetSocketReadWire:1362 : Cannot recv data: Connection reset by peer 2013-05-14 13:04:21.729+0000: 22345: error : virLXCProcessStart:1285 : internal error guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=fbcd8c3a-9939-12b4-727d-5d3526bc448f LIBVIRT_LXC_UUID=fbcd8c3a-9939-12b4-727d-5d3526bc448f LIBVIRT_LXC_NAME=dwj-lnx-dev /sbin/init error receiving signal from container: Input/output error 2013-05-14 13:04:21.731+0000: 22345: error : virNetDevSetOnline:544 : Cannot get interface flags on 'veth0': No such device 2013-05-14 13:04:21.778+0000: 22345: error : virCommandWait:2353 : internal error Child process (ip link del veth0) unexpected exit status 1: Cannot find device "veth0" 2013-05-14 13:04:21.917+0000: 22345: error : virCommandWait:2353 : internal error Child process (ip link del veth1) unexpected exit status 1: Cannot find device "veth1" ostara ~ # tail -n 10 /var/log/libvirt/lxc/dwj-lnx-dev.log 2013-05-14 13:04:20.894+0000: starting up PATH=/bin:/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3:/usr/x86_64-pc-linux-gnu/i686-pc-mingw32/gcc-bin/4.7.2 LIBVIRT_DEBUG=3 LIBVIRT_LOG_OUTPUTS=3:stderr /usr/libexec/libvirt_lxc --name dwj-lnx-dev --console 22 --security=none --handshake 25 --background --veth veth1 PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=fbcd8c3a-9939-12b4-727d-5d3526bc448f LIBVIRT_LXC_UUID=fbcd8c3a-9939-12b4-727d-5d3526bc448f LIBVIRT_LXC_NAME=dwj-lnx-dev /sbin/init 2013-05-14 13:04:21.562+0000: 1: info : libvirt version: 1.0.5 2013-05-14 13:04:21.562+0000: 1: error : lxcContainerMountFSDevPTS:808 : Failed to mount /.oldroot//var/run/libvirt/lxc/dwj-lnx-dev.devpts on /dev/pts: No such file or directory 2013-05-14 13:04:21.562+0000: 22562: info : libvirt version: 1.0.5 2013-05-14 13:04:21.562+0000: 22562: error : virLXCControllerRun:1481 : error receiving signal from container: Input/output error error receiving signal from container: Input/output error 2013-05-14 13:04:21.628+0000: 22562: error : virCommandWait:2353 : internal error Child process (ip link del veth1) unexpected exit status 1: Cannot find device "veth1" ostara ~ # virsh -c lxc:/// dumpxml dwj-lnx-dev <domain type='lxc'> <name>dwj-lnx-dev</name> <uuid>fbcd8c3a-9939-12b4-727d-5d3526bc448f</uuid> <memory unit='KiB'>500000</memory> <currentMemory unit='KiB'>500000</currentMemory> <vcpu placement='static'>2</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64'>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount' accessmode='passthrough'> <source dir='/vm/lxc/dwj-lnx-dev'/> <target dir='/'/> </filesystem> <filesystem type='mount' accessmode='passthrough'> <source dir='/usr/portage'/> <target dir='/usr/portage'/> </filesystem> <filesystem type='mount' accessmode='passthrough'> <source dir='/usr/src'/> <target dir='/usr/src'/> </filesystem> <filesystem type='mount' accessmode='passthrough'> <source dir='/home'/> <target dir='/home'/> </filesystem> <interface type='bridge'> <mac address='82:00:00:00:01:00'/> <source bridge='br0'/> </interface> <console type='pty'> <target type='lxc' port='0'/> </console> </devices> </domain> ostara ~ # ifconfig -a | egrep -v "(RX|TX) (packets|errors)" br0: flags=4355<UP,BROADCAST,PROMISC,MULTICAST> mtu 1500 inet 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 ether 00:00:00:00:00:00 txqueuelen 0 (Ethernet) br1: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST> mtu 1500 inet 192.168.3.1 netmask 255.255.255.0 broadcast 192.168.3.255 ether 06:9b:23:fb:14:5f txqueuelen 0 (Ethernet) enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.1 netmask 255.255.255.0 broadcast 192.168.0.255 ether bc:ae:c5:16:6f:3b txqueuelen 1000 (Ethernet) device interrupt 18 memory 0xfade0000-fae00000 enp5s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet xx.xx.xx.xx netmask 255.255.252.0 broadcast xx.xx.xx.xx ether bc:ae:c5:16:70:3f txqueuelen 1000 (Ethernet) device interrupt 19 memory 0xfaee0000-faf00000 enp6s2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.4.1 netmask 255.255.255.0 broadcast 192.168.4.255 ether 00:03:6d:14:78:30 txqueuelen 1000 (Ethernet) lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 0 (Local Loopback) virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether c2:ff:56:b7:a7:cd txqueuelen 0 (Ethernet)

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[libvirt-users] libvirt support for armv8
by prakash b 14 May '13

14 May '13

Is libvirt supports armv8 arch? Thanks, Prakash B

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[libvirt-users] Libvirt 1.0.5 with Openvswitch 1.11.90: unable to add bridge br0 port vnet0 operation not supported
by Christopher Paggen (cpaggen) 13 May '13

13 May '13

Howdy, Running the most recent OVS and libvirt I'm running into the following error message with virt-install: root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> ovs-vsctl -V ovs-vsctl (Open vSwitch) 1.11.90 Compiled May 6 2013 22:37:22 root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> virt-install --connect qemu:///system --name DSL2 --ram 1024 --vcpus 1 --disk path=/tmp/dsl2,size=1,bus=virtio,cache=none --network=bridge:br0 --vnc --os-type=linux --cdrom /dev/sr0 Starting install... ERROR Unable to add bridge br0 port vnet0: Operation not supported Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect qemu:///system start DSL2 otherwise, please restart your installation. root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> ovs-vsctl del-port br0 vnet0 root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> libvirtd --version libvirtd (libvirt) 1.0.5 root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> virsh --version 1.0.5 root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> virt-install --connect qemu:///system --name DSL2 --ram 1024 --vcpus 1 --disk path=/tmp/dsl2,size=1,bus=virtio,cache=none --network=bridge:br0 --vnc --os-type=linux --cdrom /dev/sr0 Starting install... ERROR Unable to add bridge br0 port vnet0: Operation not supported Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect qemu:///system start DSL2 otherwise, please restart your installation. root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> ovs-vsctl show b81788a2-f45d-4fad-aad2-f423e6e70bad Bridge "br0" Port "eth1" Interface "eth1" Port "br0" Interface "br0" type: internal Port "tap0" Interface "tap0" root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5> Even if I create a new OVS switch I get the same result: root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> ovs-vsctl add-br b1 root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> virt-install --connect qemu:///system --name DSL2 --ram 1024 --vcpus 1 --disk path=/tmp/dsl2,size=1,bus=virtio,cache=none --network=bridge:b1 --vnc --os-type=linux --cdrom /dev/sr0 Starting install... ERROR Unable to add bridge b1 port vnet0: Operation not supported Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect qemu:///system start DSL2 otherwise, please restart your installation. root@qemu-kvm:~/libvirt-1.0.5#<mailto:root@qemu-kvm:~/libvirt-1.0.5#> Nothing in the openvswitch log file (OVS itself works fine, I can start VMs with the kvm command line). Any clues? I'm not too sure how to trace libvirt calls to OVS (according to the release notes, versions 1.0+ of libvirtd should work with OVS. Note: I am not using brcompat, I believe it's obsolete in the OVS version I'm running). Thanks, Chris.

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[libvirt-users] Check Swap Usage on Guest VM from Host
by Nehal J. Wani 13 May '13

13 May '13

I was wondering if swap usage of Guest VM can be checked from Host machine via command line.Is it possible? -- Nehal J. Wani UG2, BTech CS+MS(CL) IIIT-Hyderabad http://commanlinewani.blogspot.com

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[libvirt-users] Way for a VM to reboot from a snapshot?
by Ken Coar 10 May '13

10 May '13

Using the koan command, a VM can essentially request that it be reprovisioned. Is there any way for a VM to request that it reboot from a snapshot taken with virsh? Thanks.. -- #ken B-)} Ken Coar, RHCE, RHCSA, Sanagendamgagwedweinini IT Engineering Tower, Red Hat/RDU "Millennium hand and shrimp!"

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[libvirt-users] latency between LIFECYCLE event and notification generation
by nishant burte 10 May '13

10 May '13

Hi, I have registered for LIFECYCLE events of libvirt. But I don't know, 1. about the the latency of these events happening and notification generation. e.g. suppose a VM goes down. How much time it takes to realize that the particular VM has gone down(going to say, DEFINED state) and then notification is generated? 2. Second question is, can someone please explain what are the sequence of steps happen between a VM going down and the notification is generated? Coul you please answer both the queries? Thanks Nishant

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