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[libvirt-users] migrate vm images to new storage pool
by Jamie Fargen 02 Feb '13

02 Feb '13

I am searching for directions for using live block migration to copy running vm's to a different storage pool. Example: VM1 running on HOST1, the image(s) for VM1 are stored in /var/lib/libvirt/images. I'd like to copy the disk image(s) that VM1 is using to /nfs/images. Without stopping/pausing/powering down the VM. Regards, Jamie Ian Fargen

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Re: [libvirt-users] windows 2008 guest causing rcu_shed to emit NMI
by Andrey Korolyov 01 Feb '13

01 Feb '13

On Thu, Jan 31, 2013 at 12:11 AM, Marcelo Tosatti <mtosatti(a)redhat.com> wrote: > On Wed, Jan 30, 2013 at 11:21:08AM +0300, Andrey Korolyov wrote: >> On Wed, Jan 30, 2013 at 3:15 AM, Marcelo Tosatti <mtosatti(a)redhat.com> wrote: >> > On Tue, Jan 29, 2013 at 02:35:02AM +0300, Andrey Korolyov wrote: >> >> On Mon, Jan 28, 2013 at 5:56 PM, Andrey Korolyov <andrey(a)xdel.ru> wrote: >> >> > On Mon, Jan 28, 2013 at 3:14 AM, Marcelo Tosatti <mtosatti(a)redhat.com> wrote: >> >> >> On Mon, Jan 28, 2013 at 12:04:50AM +0300, Andrey Korolyov wrote: >> >> >>> On Sat, Jan 26, 2013 at 12:49 AM, Marcelo Tosatti <mtosatti(a)redhat.com> wrote: >> >> >>> > On Fri, Jan 25, 2013 at 10:45:02AM +0300, Andrey Korolyov wrote: >> >> >>> >> On Thu, Jan 24, 2013 at 4:20 PM, Marcelo Tosatti <mtosatti(a)redhat.com> wrote: >> >> >>> >> > On Thu, Jan 24, 2013 at 01:54:03PM +0300, Andrey Korolyov wrote: >> >> >>> >> >> Thank you Marcelo, >> >> >>> >> >> >> >> >>> >> >> Host node locking up sometimes later than yesterday, bur problem still >> >> >>> >> >> here, please see attached dmesg. Stuck process looks like >> >> >>> >> >> root 19251 0.0 0.0 228476 12488 ? D 14:42 0:00 >> >> >>> >> >> /usr/bin/kvm -no-user-config -device ? -device pci-assign,? -device >> >> >>> >> >> virtio-blk-pci,? -device >> >> >>> >> >> >> >> >>> >> >> on fourth vm by count. >> >> >>> >> >> >> >> >>> >> >> Should I try upstream kernel instead of applying patch to the latest >> >> >>> >> >> 3.4 or it is useless? >> >> >>> >> > >> >> >>> >> > If you can upgrade to an upstream kernel, please do that. >> >> >>> >> > >> >> >>> >> >> >> >>> >> With vanilla 3.7.4 there is almost no changes, and NMI started firing >> >> >>> >> again. External symptoms looks like following: starting from some >> >> >>> >> count, may be third or sixth vm, qemu-kvm process allocating its >> >> >>> >> memory very slowly and by jumps, 20M-200M-700M-1.6G in minutes. Patch >> >> >>> >> helps, of course - on both patched 3.4 and vanilla 3.7 I`m able to >> >> >>> >> kill stuck kvm processes and node returned back to the normal, when on >> >> >>> >> 3.2 sending SIGKILL to the process causing zombies and hanged ``ps'' >> >> >>> >> output (problem and workaround when no scheduler involved described >> >> >>> >> here http://www.spinics.net/lists/kvm/msg84799.html) >> >> >>> > >> >> >>> > Try disabling pause loop exiting with ple_gap=0 kvm-intel.ko module parameter. >> >> >>> > >> >> >>> >> >> >>> Hi Marcelo, >> >> >>> >> >> >>> thanks, this parameter helped to increase number of working VMs in a >> >> >>> half of order of magnitude, from 3-4 to 10-15. Very high SY load, 10 >> >> >>> to 15 percents, persists on such numbers for a long time, where linux >> >> >>> guests in same configuration do not jump over one percent even under >> >> >>> stress bench. After I disabled HT, crash happens only in long runs and >> >> >>> now it is kernel panic :) >> >> >>> Stair-like memory allocation behaviour disappeared, but other symptom >> >> >>> leading to the crash which I have not counted previously, persists: if >> >> >>> VM count is ``enough'' for crash, some qemu processes starting to eat >> >> >>> one core, and they`ll panic system after run in tens of minutes in >> >> >>> such state or if I try to attach debugger to one of them. If needed, I >> >> >>> can log entire crash output via netconsole, now I have some tail, >> >> >>> almost the same every time: >> >> >>> http://xdel.ru/downloads/btwin.png >> >> >> >> >> >> Yes, please log entire crash output, thanks. >> >> >> >> >> > >> >> > Here please, 3.7.4-vanilla, 16 vms, ple_gap=0: >> >> > >> >> > http://xdel.ru/downloads/oops-default-kvmintel.txt >> >> >> >> Just an update: I was able to reproduce that on pure linux VMs using >> >> qemu-1.3.0 and ``stress'' benchmark running on them - panic occurs at >> >> start of vm(with count ten working machines at the moment). Qemu-1.1.2 >> >> generally is not able to reproduce that, but host node with older >> >> version crashing on less amount of Windows VMs(three to six instead >> >> ten to fifteen) than with 1.3, please see trace below: >> >> >> >> http://xdel.ru/downloads/oops-old-qemu.txt >> > >> > Single bit memory error, apparently. Try: >> > >> > 1. memtest86. >> > 2. Boot with slub_debug=ZFPU kernel parameter. >> > 3. Reproduce on different machine >> > >> > >> >> Hi Marcelo, >> >> I always follow the rule - if some weird bug exists, check it on >> ECC-enabled machine and check IPMI logs too before start complaining >> :) I have finally managed to ``fix'' the problem, but my solution >> seems a bit strange: >> - I have noticed that if virtual machines started without any cgroup >> setting they will not cause this bug under any conditions, >> - I have thought, very wrong in my mind, that the >> CONFIG_SCHED_AUTOGROUP should regroup the tasks without any cgroup and >> should not touch tasks already inside any existing cpu cgroup. First >> sight on the 200-line patch shows that the autogrouping always applies >> to all tasks, so I tried to disable it, >> - wild magic appears - VMs didn`t crashed host any more, even in count >> 30+ they work fine. >> I still don`t know what exactly triggered that and will I face it >> again under different conditions, so my solution more likely to be a >> patch of mud in wall of the dam, instead of proper fixing. >> >> There seems to be two possible origins of such error - a very very >> hideous race condition involving cgroups and processes like qemu-kvm >> causing frequent context switches and simple incompatibility between >> NUMA, logic of CONFIG_SCHED_AUTOGROUP and qemu VMs already doing work >> in the cgroup, since I have not observed this errors on single numa >> node(mean, desktop) on relatively heavier condition. > > Yes, it would be important to track it down though. Enabling > slub_debug=ZFPU kernel parameter should help. > > Hi Marcelo, I have finally beat that one. As I have mentioned before in the off-list message, nested cgroups for vcpu/emulator threads created by libvirt was a root cause of this problem. Today we`ve disabled creation of cgroup deeper than qemu/vm/ level and trace didn`t showed up under different workloads. So for libvirt itself, it may be a feature request to create thread-based cgroups iff any element of the VM` config requires that. As for cgroups, seems it is fatal to have very large amount of nested elements inside cpu on qemu-kvm, or on very large amount of threads - since I have limited core amount on each node, I can`t prove what exactly, complicated cgroup hierarchy or some side effects putting threads on the dedicated cgroup, caused all this pain. And, of course, without Windows(tm) bug is very hard to observe in the wild, since almost no synthetic test I have put on the linux VMs is able to show it.

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[libvirt-users] There's no output when connecting to console of domain on PowerPC
by Yin Olivia-R63875 31 Jan '13

31 Jan '13

Hi, I tried to use libvirt to run KVM/QEMU on Freescale PowerPC platforms. So far there's only one serial device (spapr-vty) defined in QEMU to work as console for IBM PSeries platform. There's no serial device support in QEMU for Freescale PowerPC (ePAPR). libvirt/src/qemu/qemu_command.c /* This function generates the correct '-device' string for character * devices of each architecture. */ char * qemuBuildChrDeviceStr(virDomainChrDefPtr serial, virBitmapPtr qemuCaps, char *os_arch, char *machine) { virBuffer cmd = VIR_BUFFER_INITIALIZER; if (STREQ(os_arch, "ppc64") && STREQ(machine, "pseries")) { if (serial->deviceType == VIR_DOMAIN_CHR_DEVICE_TYPE_SERIAL && serial->source.type == VIR_DOMAIN_CHR_TYPE_PTY && serial->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_SPAPRVIO) { virBufferAsprintf(&cmd, "spapr-vty,chardev=char%s", serial->info.alias); if (qemuBuildDeviceAddressStr(&cmd, &serial->info, qemuCaps) < 0) goto error; } } else virBufferAsprintf(&cmd, "isa-serial,chardev=char%s,id=%s", serial->info.alias, serial->info.alias); if (virBufferError(&cmd)) { virReportOOMError(); goto error; } return virBufferContentAndReset(&cmd); error: virBufferFreeAndReset(&cmd); return NULL; } We usually connect guest with telnet. For instance, /usr/bin/qemu-system-ppc -name demo -M ppce500v2 -enable-kvm -m 256 -nographic -kernel /media/ram/uImage -initrd /media/ram/ramdisk -append "root=/dev/ram rw console=ttyS0,115200" -serial tcp::4445,server Then to run 'telnet 10.193.20.xxx 4445' could connect the guest. The temporary workaround is not add '-device' string after '-serial' option. diff -Nur libvirt-0.10.1.orig/src/qemu/qemu_command.c libvirt-0.10.1/src/qemu/qemu_command.c --- libvirt-0.10.1.orig/src/qemu/qemu_command.c 2012-08-30 15:35:18.000000000 +0530 +++ libvirt-0.10.1/src/qemu/qemu_command.c 2012-10-05 17:19:32.060368755 +0530 @@ -5501,13 +5501,15 @@ virCommandAddArg(cmd, devstr); VIR_FREE(devstr); - virCommandAddArg(cmd, "-device"); - if (!(devstr = qemuBuildChrDeviceStr(serial, qemuCaps, + if (!STREQ(def->os.arch, "ppc")) { + virCommandAddArg(cmd, "-device"); + if (!(devstr = qemuBuildChrDeviceStr(serial, qemuCaps, def->os.arch, def->os.machine))) - goto error; - virCommandAddArg(cmd, devstr); - VIR_FREE(devstr); + goto error; + virCommandAddArg(cmd, devstr); + VIR_FREE(devstr); + } } else { virCommandAddArg(cmd, "-serial"); if (!(devstr = qemuBuildChrArgStr(&serial->source, NULL))) Applying the above patch to libvirt, all the other domain control commands could work except 'virsh console domain'. # cat >demo.args <<EOF > /usr/bin/qemu-system-ppc -name demo -M ppce500v2 -enable-kvm -m 256 -nographic -kernel /media/ram/uImage -initrd /media/ram/ramdisk -append "root=/dev/ram rw console=ttyS0,115200" -serial tcp::4445,server -net nic > EOF # vi demo.args /usr/bin/qemu-system-ppc -name demo -M ppce500v2 -enable-kvm -m 256 -nographic -kernel /media/ram/uImage -initrd /media/ram/ramdisk -append "root=/dev/ram rw console=ttyS0,115200" -serial tcp::4445,server -net nic # virsh domxml-from-native qemu-argv demo.args >demo.xml # vi demo.xml <domain type='kvm'> <name>demo</name> <uuid>985d7154-83c8-0763-cbac-ecd159eee8a6</uuid> <memory unit='KiB'>262144</memory> <currentMemory unit='KiB'>262144</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='ppc' machine='ppce500v2'>hvm</type> <kernel>/media/ram/uImage</kernel> <initrd>/media/ram/ramdisk</initrd> <cmdline>root=/dev/ram rw console=ttyS0,115200</cmdline> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-system-ppc</emulator> <serial type='tcp'> <source mode='bind' host='' service='4445'/> <protocol type='raw'/> <target port='0'/> </serial> <console type='tcp'> <source mode='bind' host='' service='4445'/> <protocol type='raw'/> <target type='serial' port='0'/> </console> <memballoon model='virtio'/> </devices> </domain> # virsh -c qemu:///system define demo.xml # virsh -c qemu:///system start demo But it seemed that can't connect to the console. # virsh -c qemu:///system console demo Connected to domain test Escape character is ^] error: internal error character device (null) is not using a PTY I tried also use '-serial pty' option, /usr/bin/qemu-system-ppc -name test -M ppce500v2 -enable-kvm -m 256 -nographic -kernel /media/ram/uImage -initrd /media/ram/ramdisk -append "root=/dev/ram rw console=ttyS0,115200" -serial pty Then there's no other output after the below message: # virsh -c qemu:///system console demo Connected to domain test Escape character is ^] It seemed not libvirt group issue. I also tried the LXC. It could connect to the console if <init>/bin/sh/</init> instead of <init>/sbin/init</init> Best Regards, Olivia

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[libvirt-users] VMs fail to start with NUMA configuration
by Doug Goldstein 31 Jan '13

31 Jan '13

I am using libvirt 0.10.2.2 and qemu-kvm 1.2.2 (qemu-kvm 1.2.0 + qemu 1.2.2 applied on top plus a number of stability patches). Having issue where my VMs fail to start with the following message: kvm_init_vcpu failed: Cannot allocate memory Following the instructions at http://libvirt.org/formatdomain.html#elementsNUMATuning I've added the following to my VCPU configuration: <vcpu placement='auto'>2</vcpu> Which libvirt expands out as I'd expect per the documentation to: <vcpu placement='auto'>2</vcpu> <numatune> <memory tune='strict' placement='auto'/> </numatune> However, the VMs won't start and the system is no low on memory. # numactl --hardware available: 8 nodes (0-7) node 0 cpus: 0 4 8 12 16 20 24 28 node 0 size: 16374 MB node 0 free: 11899 MB node 1 cpus: 32 36 40 44 48 52 56 60 node 1 size: 16384 MB node 1 free: 15318 MB node 2 cpus: 2 6 10 14 18 22 26 30 node 2 size: 16384 MB node 2 free: 15766 MB node 3 cpus: 34 38 42 46 50 54 58 62 node 3 size: 16384 MB node 3 free: 15347 MB node 4 cpus: 3 7 11 15 19 23 27 31 node 4 size: 16384 MB node 4 free: 15041 MB node 5 cpus: 35 39 43 47 51 55 59 63 node 5 size: 16384 MB node 5 free: 15202 MB node 6 cpus: 1 5 9 13 17 21 25 29 node 6 size: 16384 MB node 6 free: 15197 MB node 7 cpus: 33 37 41 45 49 53 57 61 node 7 size: 16368 MB node 7 free: 15669 MB The system has 4 Opteron 6272 which add up to a total of 64 cores, 16 cores per socket. These are the CPUs that Dan B noticed issues with in the past regarding topology but I thought this was resolved. But the capabilities are posted below, you'll notice the topology is incorrect. # virsh capabilities <capabilities> <host> <uuid>44454c4c-5300-1038-8031-c4c04f545331</uuid> <cpu> <arch>x86_64</arch> <model>Opteron_G4</model> <vendor>AMD</vendor> <topology sockets='1' cores='8' threads='2'/> <feature name='nodeid_msr'/> <feature name='wdt'/> <feature name='skinit'/> <feature name='ibs'/> <feature name='osvw'/> <feature name='cr8legacy'/> <feature name='extapic'/> <feature name='cmp_legacy'/> <feature name='fxsr_opt'/> <feature name='mmxext'/> <feature name='osxsave'/> <feature name='monitor'/> <feature name='ht'/> <feature name='vme'/> </cpu> <power_management> <suspend_disk/> </power_management> <migration_features> <live/> <uri_transports> <uri_transport>tcp</uri_transport> </uri_transports> </migration_features> <topology> <cells num='8'> <cell id='0'> <cpus num='8'> <cpu id='0'/> <cpu id='4'/> <cpu id='8'/> <cpu id='12'/> <cpu id='16'/> <cpu id='20'/> <cpu id='24'/> <cpu id='28'/> </cpus> </cell> <cell id='1'> <cpus num='8'> <cpu id='32'/> <cpu id='36'/> <cpu id='40'/> <cpu id='44'/> <cpu id='48'/> <cpu id='52'/> <cpu id='56'/> <cpu id='60'/> </cpus> </cell> <cell id='2'> <cpus num='8'> <cpu id='2'/> <cpu id='6'/> <cpu id='10'/> <cpu id='14'/> <cpu id='18'/> <cpu id='22'/> <cpu id='26'/> <cpu id='30'/> </cpus> </cell> <cell id='3'> <cpus num='8'> <cpu id='34'/> <cpu id='38'/> <cpu id='42'/> <cpu id='46'/> <cpu id='50'/> <cpu id='54'/> <cpu id='58'/> <cpu id='62'/> </cpus> </cell> <cell id='4'> <cpus num='8'> <cpu id='3'/> <cpu id='7'/> <cpu id='11'/> <cpu id='15'/> <cpu id='19'/> <cpu id='23'/> <cpu id='27'/> <cpu id='31'/> </cpus> </cell> <cell id='5'> <cpus num='8'> <cpu id='35'/> <cpu id='39'/> <cpu id='43'/> <cpu id='47'/> <cpu id='51'/> <cpu id='55'/> <cpu id='59'/> <cpu id='63'/> </cpus> </cell> <cell id='6'> <cpus num='8'> <cpu id='1'/> <cpu id='5'/> <cpu id='9'/> <cpu id='13'/> <cpu id='17'/> <cpu id='21'/> <cpu id='25'/> <cpu id='29'/> </cpus> </cell> <cell id='7'> <cpus num='8'> <cpu id='33'/> <cpu id='37'/> <cpu id='41'/> <cpu id='45'/> <cpu id='49'/> <cpu id='53'/> <cpu id='57'/> <cpu id='61'/> </cpus> </cell> </cells> </topology> <secmodel> <model>none</model> <doi>0</doi> </secmodel> <secmodel> <model>dac</model> <doi>0</doi> </secmodel> </host> <guest> <os_type>hvm</os_type> <arch name='i686'> <wordsize>32</wordsize> <emulator>/usr/bin/qemu-system-x86_64</emulator> <machine>pc-1.2</machine> <machine canonical='pc-1.2'>pc</machine> <machine>pc-1.1</machine> <machine>pc-1.0</machine> <machine>pc-0.15</machine> <machine>pc-0.14</machine> <machine>pc-0.13</machine> <machine>pc-0.12</machine> <machine>pc-0.11</machine> <machine>pc-0.10</machine> <machine>isapc</machine> <machine>none</machine> <domain type='qemu'> </domain> <domain type='kvm'> <emulator>/usr/bin/qemu-kvm</emulator> <machine>pc-1.2</machine> <machine canonical='pc-1.2'>pc</machine> <machine>pc-1.1</machine> <machine>pc-1.0</machine> <machine>pc-0.15</machine> <machine>pc-0.14</machine> <machine>pc-0.13</machine> <machine>pc-0.12</machine> <machine>pc-0.11</machine> <machine>pc-0.10</machine> <machine>isapc</machine> <machine>none</machine> </domain> </arch> <features> <cpuselection/> <deviceboot/> <pae/> <nonpae/> <acpi default='on' toggle='yes'/> <apic default='on' toggle='no'/> </features> </guest> <guest> <os_type>hvm</os_type> <arch name='x86_64'> <wordsize>64</wordsize> <emulator>/usr/bin/qemu-system-x86_64</emulator> <machine>pc-1.2</machine> <machine canonical='pc-1.2'>pc</machine> <machine>pc-1.1</machine> <machine>pc-1.0</machine> <machine>pc-0.15</machine> <machine>pc-0.14</machine> <machine>pc-0.13</machine> <machine>pc-0.12</machine> <machine>pc-0.11</machine> <machine>pc-0.10</machine> <machine>isapc</machine> <machine>none</machine> <domain type='qemu'> </domain> <domain type='kvm'> <emulator>/usr/bin/qemu-kvm</emulator> <machine>pc-1.2</machine> <machine canonical='pc-1.2'>pc</machine> <machine>pc-1.1</machine> <machine>pc-1.0</machine> <machine>pc-0.15</machine> <machine>pc-0.14</machine> <machine>pc-0.13</machine> <machine>pc-0.12</machine> <machine>pc-0.11</machine> <machine>pc-0.10</machine> <machine>isapc</machine> <machine>none</machine> </domain> </arch> <features> <cpuselection/> <deviceboot/> <acpi default='on' toggle='yes'/> <apic default='on' toggle='no'/> </features> </guest> </capabilities> Any suggestions are appreciated. -- Doug Goldstein

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[libvirt-users] Libvirt support for windows
by varun bhatnagar 31 Jan '13

31 Jan '13

Hi, I want to use libvirt for windows but when i try to launch virsh it gives an error message saying "*error: invalid argument in transport methods unix, ssh and ext are not supported under Windows"* The version which I downloaded is libvirt-0.8.8.exe. I want to connect to two virtualization techniques --- *Virtualbox* and *VMWare* If libvirt is not supported on windows then is there any other tool or API which supports multiple virtualization technology? Thanks in advance..!!!!

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[libvirt-users] Fail to build libvirt-sandbox under ubuntu 12.10
by pablo platt 30 Jan '13

30 Jan '13

I'm trying to build libvirt-sandbox under ubuntu 12.10 sudo apt-get install git build-essential lxc libvirt-bin libvirt-glib-1.0 libglib2.0-0 libglib2.0-dev gtk-doc-tools libxml2-dev libselinux-dev git clone git://libvirt.org/libvirt-sandbox.git cd libvirt-sandbox sudo ./autobuild The error I'm getting: make[2]: Entering directory `/home/user/libvirt-sandbox/build/bin' CC virt_sandbox-virt-sandbox.o CCLD virt-sandbox CC virt_sandbox_service_util-virt-sandbox-service-util.o make[2]: *** No rule to make target `container.c', needed by `virt_sandbox_service_util-container.o'. Stop. Am I doing something wrong? Thanks

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[libvirt-users] http problem with (a particular url) and default (nat) networking
by John McFarlane 29 Jan '13

29 Jan '13

At work I have a script that provisions a vm for use by employees. One step in this process is to fetch hadoop, which we happen to get from cloudera. I noticed the script always failed when I used libvirt's default networking (nat) but worked fine when I used user mode networking. My instinct is that this is related to (potentially uncommon) network traffic from the server in question, and the iptables rules added by libvirt. Repro steps: 1. Create a vm (I tested with linux and freebsd guests) using default libvirt networking settings (<interface type='network'>). 2. wget, curl, fetch: http://archive.cloudera.com/one-click-install/lucid/cdh3-repository_1.0_all… Observe it will "hang". If you use strace you'll see it block on the select call. My particular host is using a virbr0 network bridge, with the following iptables rules: $ iptables -S -v -Z -P INPUT ACCEPT -c 404828 91071544 -P FORWARD ACCEPT -c 0 0 -P OUTPUT ACCEPT -c 402905 45139291 -A INPUT -i virbr0 -p udp -m udp --dport 53 -c 26 1703 -j ACCEPT -A INPUT -i virbr0 -p tcp -m tcp --dport 53 -c 0 0 -j ACCEPT -A INPUT -i virbr0 -p udp -m udp --dport 67 -c 70 22960 -j ACCEPT -A INPUT -i virbr0 -p tcp -m tcp --dport 67 -c 0 0 -j ACCEPT -A FORWARD -d 192.168.122.0/24 -o virbr0 -m state --state RELATED,ESTABLISHED -c 1191 1495856 -j ACCEPT -A FORWARD -s 192.168.122.0/24 -i virbr0 -c 853 64266 -j ACCEPT -A FORWARD -i virbr0 -o virbr0 -c 6 1968 -j ACCEPT -A FORWARD -o virbr0 -c 0 0 -j REJECT --reject-with icmp-port-unreachable -A FORWARD -i virbr0 -c 0 0 -j REJECT --reject-with icmp-port-unreachable Zeroing chain `INPUT' Zeroing chain `FORWARD' Zeroing chain `OUTPUT' I'm not sure how best to diagnose this problem. Any ideas or tips? Thanks! John M.

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[libvirt-users] not able to stop vmware player node through libvirt API
by varun bhatnagar 29 Jan '13

29 Jan '13

Hi, I have started one node through libvirt API using its start method. I am trying to stop that node using the *destroy *method provided by the API but I am not able to do so. Instead, I am getting one message saying: *libvir: error: internal error Child process (vmrun -T player stop /root/test_folder/myImage.vmx soft) unexpected exit status 255* Can anybody tell me why I am not able to stop the node. Thanks in advance. :)

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[libvirt-users] limit memory and CPU when using libvirt-sandbox
by pablo platt 29 Jan '13

29 Jan '13

I'm considering using virt-sandbox with lxc to sandbox and execute untrusted code like python scripts and compiled C code. Is it possible to limit CPU and Memory like is possible with lxc-execute and a config file? What are the defaults security settings? Is it completely isolated by default? What's the difference between lxc-execute and libvirt-sandbox? How can I use it in ubuntu? Thanks

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[libvirt-users] Not able to do ssh with libvirt
by varun bhatnagar 25 Jan '13

25 Jan '13

Hi, I am having issue while doing *ssh* to a virtual node through libvirt. The nodes's ip address is 192.168.82.1. When I am giving the command it is giving the following error message: *virsh# connect vbox+ssh://192.168.82.1/session* *Password:* *error: Failed to connect to the hypervisor* *error: End of ifle while reading data: sh: nc: command not found: Input/output error.* Can anyone tell me why am I facing this problem and how to resolve it. Thanks in advance.

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