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[libvirt-users] Would a DOS on dovecot running under a VM cause host to crash?
by Hugh Davenport 20 Jun '13

20 Jun '13

Hey All, I'm just wondering whether this is what caused my server to crash. Started last night in NZ land. Jun 20 19:22:11 elm dovecot: imap-login: Disconnected (tried to use disallowed plaintext auth): user=<>, rip=attackerip, lip=10.0.0.3, session=<0C8LzpDfZQDINsQC> occasionally get Jun 20 19:22:52 elm dovecot: imap-login: Disconnected (no auth attempts in 1 secs): user=<>, rip=attackerip, lip=10.0.0.3, session=<bHdz0JDfpwDINsQC> or in 0 secs last at Jun 20 19:26:24 elm dovecot: imap-login: Disconnected (tried to use disallowed plaintext auth): user=<>, rip=attackerip, lip=10.0.0.3, session=<1MUR3ZDfcwDINsQC> and a minute later the server lost contact to the world. When I checked a bit later, the underlying host machine (dovecot runs on a VM (KVM)) had been powered off. Now, here in NZ land, there was also a crazy storm last night, and lots of brown outs. There could potentially of been a surge that killed it, but the UPS was still running fine when I started it again. The "attack" lasted around 4 minutes, in which there was 1161 lines in the log for a single attacker ip, and no other similar logs previously. Would this be enough to kill not only the VM running dovecot, but the underlying host machine? All up to date with patches, running debian stable (wheezy). dovecot-core debian package version 1:2.1.7-7 dovecot version 2.1.7 I notice there is a version 2.2.3 out, but not in debian yet. Could this fix this issue? I don't particularly want to have it happen again :D. The host is running debian oldstable (squeeze), so could update more. libvirt0 debian package version 0.8.3-5+squeeze5 libvirt version 0.8.3 I notice there is a version 1.0.6 out (debian stable only has 0.9.12-11+deb7u1, which is 0.9.12), would either of these versions fix an issue like this? qemu-kvm debian package version 0.12.5+dfsg-5+squeeze10 kernel is 2.6.32-5-amd64 Any thoughts? Cheers, Hugh

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[libvirt-users] libvirt hang on domain attemp to create domain
by Александр 20 Jun '13

20 Jun '13

good day, i am trying to create domain via virDomainDefineXML. and my program hanging, also i failed to caonnect to libvirt daemon with virt-manager after this, only killing libvirtd via SIGKILL and restarting it solveing hang (i mean after restart i able to connect with virt-manager), i using following domain xml <?xml version="1.0" encoding="UTF-8"?> <domain type="kvm"> <tittle>Automatically created domain with default configuration</tittle> <name>vm1</name> <description>no description</description> <os> <type>hvm</type> <boot dev="cdrom"/> <boot dev="hd"/> </os> <vcpu>1</vcpu> <memory unit="MB">512</memory> <cpu model="host-model"> <topology sockets="1" cores="1" threads="1"/> </cpu> <clock offset="localtime"/> <devices> <graphics type="vnc" autoport="yes" password="admin"/> <channel type="unix"> <source mode="bind" path="/var/run/vm1.sock"/> <target type="virtio" name="org.guest_agent.0"/> </channel> </devices> </domain> i have this calls on stack 0 0x00007ffff48c1750 __poll_nocancel 1 0x00007ffff649e5ca virNetClientIOEventLoop 2 0x00007ffff649ed96 virNetClientSendInternal 3 0x00007ffff64a0443 virNetClientSendWithReply 4 0x00007ffff64a0daa virNetClientProgramCall 5 0x00007ffff6478566 callFull.isra.2 6 0x00007ffff6487fa2 remoteDomainDefineXML 7 0x00007ffff6449d2f virDomainDefineXML 8 0x0000000000426941 virt_domain::create /home/sss/install/git/work/avirt/vm_pool/vm_pool/libvirt.cpp 295 9 0x000000000040c1a9 main /home/sss/install/git/work/avirt/vm_pool/vm_pool/main.cpp 40 what i am doing wrong ?

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[libvirt-users] Haswell 4770 misidentified as Sandy Bridge
by Michael Giardino 19 Jun '13

19 Jun '13

Hi, I'm running libvert on a Debian 7 system. I have upgraded libvert and qemu from source (v1.06 and 1.5.0 respectively) and the problem persists. The guest OS is also a Debian 7 system running a non-SMP kernel. The error message from virt-manager is Error starting domain: unsupported configuration: guest and host CPU are not compatible: Host CPU does not provide required features: rtm, invpcid, erms, bmi2, smep, avx2, hle, bmi1, fsgsbase, pcid Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 66, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/domain.py", line 1114, in startup self._backend.create() File "/usr/local/lib/python2.7/dist-packages/libvirt.py", line 698, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: unsupported configuration: guest and host CPU are not compatible: Host CPU does not provide required features: rtm, invpcid, erms, bmi2, smep, avx2, hle, bmi1, fsgsbase, pcid but the host /proc/cpuinfo gives the correct flags as processor : 7 vendor_id : GenuineIntel cpu family : 6 model : 60 model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz stepping : 3 microcode : 0x7 cpu MHz : 800.000 cache size : 8192 KB physical id : 0 siblings : 8 core id : 3 cpu cores : 4 apicid : 7 initial apicid : 7 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm bogomips : 6795.91 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: Is there a place in the code I can look where the CPU flags are checked? I did create this VM on the Debian 7 versions of libvirt and qemu, but I don't see that it should be much of a problem since you can swap CPUs in virt-manager. The end goal is to read Sandy Bridge+ RAPL MSRs from the guest OS. perf_events are now being exported, which is great for my work, but if I could read some of those RAPL MSRs, It would make my life orders of magnitude easier. Any help would be much appreciated. Best, Michael Giardino <giardino(a)ece.gatech.edu> <michael.giardino(a)gmail.com>

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[libvirt-users] Migration between 2 hosts
by Parakkal, Navin S 19 Jun '13

19 Jun '13

Hi , How does migration of VMs between 2 hosts work ? Say we want to migrate a VM from host A - > B , does it create a process on B, copy all the data of the process on A to B and then once done kill process on A. Is it how it happens ? Can someone tell me how the copying of data between process on A and new process on B is done ? Regards, Navin

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[libvirt-users] Live Migration Without Shared Storage
by cmcc.dylan 19 Jun '13

19 Jun '13

I‘m very exited to hear that qemu has supported live migration without shared storage and I also have found some persons give their experiments, for example: （http://blog.allanglesit.com/2011/08/linux-kvm-management-live-migration-without-shared-storage/） # virsh migrate --live vmname qemu+ssh://kvmnode02.allanglesit.net/system --copy-storage-all --verbose --persistent --undefinesource I repeated the above experiment, but I failed. I want to know I need which version of qemu and libvirt and how the progress of the new feature.

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[libvirt-users] Not able to open Xen Connection using libvirt
by varun bhatnagar 18 Jun '13

18 Jun '13

Hi, I am trying to create virtual machine through libvirt using xen hypervisor. I was able to install xen successfully but when I tried connecting to the hypervisor it gave an error. And while installing libvirt (libvirt-1.0.1) I installed it with xen support. I am pasting the snapshot of the error below: [image: Inline image 1] Can anyone tell me why I am getting this error? // Varun

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[libvirt-users] Using a Windows partition as libvirt media
by Roland Giesler 18 Jun '13

18 Jun '13

I'm running Ubuntu desktop 12.10 with libvirt and virt-manager (gui). I have been led to believe that it is possible to use and existing partition as the disk storage volume for a virtual machine. The windows partition is /dev/sda2, but if I use fs: Pre-formatted Block Device I can select the partion. What I can't figure out is how to tell the vitual machine to use this volume. I tried with virt-manager, but the only options I have are * Local media * Network install * Network Boot * Import Existing Disk Image How can I do this? regards Roland Giesler

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[libvirt-users] Unable to setup qemu-guest-agent
by Nehal J. Wani 17 Jun '13

17 Jun '13

Could anyone please list out the steps required to run the command $virsh qemu-agent-command Steps that I followed: 1. Clone the latest source code of libvirt 2. Create a vm of f18 (source:liveCD) 3. Edit f18 domain xml and add this: <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/f16x86_64.agent'/> <target type='virtio' name='org.qemu.guest_agent.0'/> </channel> 4. On host: #./tools/virsh start f18 5. On guest: #yum install qemu-guest-agent -y 6. On host: # ./tools/virsh qemu-agent-command f18 '{"execute":"guest-network-get-interfaces"}' Expected Response: {"return":[{"name":"lo","ip- addresses":[{"ip-address-type":"ipv4","ip-address":"127.0.0.1","prefix":8},{"ip-address-type":"ipv6","ip-address":"::1","prefix":128}],"hardware-address":"00:00:00:00:00:00"},{"name":"eth0","ip-addresses":[{"ip-address-type":"ipv4","ip-address":"192.168.122.62","prefix":24},{"ip-address-type":"ipv6","ip-address":"fe80::5054:ff:fe14:9998","prefix":64}],"hardware-address":"52:54:00:14:99:98"}]} Actual result: (null) Where am I going wrong? -- Nehal J. Wani UG2, BTech CS+MS(CL) IIIT-Hyderabad http://commanlinewani.blogspot.com

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[libvirt-users] Enabling route_localnet on private network
by McEvoy, James 15 Jun '13

15 Jun '13

I have an issue setting a persistent kernel option on a libvirt net device since that device does not exist early enough during the boot of the KVM host. I am using the 127.0.0.0 local net for cluster communication between the KVM host and its guests as well as between KVM guests. In order to use addresses on the 127.0.0.0/8 network, which is reserved for local communication, two configuration changes must be made after the system is rebooted. First the default route of 127.0.0.1/0 to the loopback device must be deleted which I did by adding an "ip route delete" command to the ifcfg-br0 file that starts the bridged network that is used by the KVM guests. The second configuration change is where I am having trouble. For the second change I need to set the kernel boolean net.ipv4.conf.pvt0.route_localnet to be true to allow routing of the 127.0.0.0/8 on the libvirt net device that I have configured to use addresses on the 127.0.0.0/8 network. Normally I would do this by adding "net.ipv4.conf.pvt0.route_localnet = 1" to /etc/sysctl.conf but this does not work because the libvirt pvt0 device does not exist when the settings in the /etc/sysctl.conf are done. My question is where can I add the command "/sbin/sysctl -w net.ipv4.conf.pvt0.route_localnet=1" to the start-up files so the command is run after the libvirt device pvt0 has been autostarted? I am running on RHEL 6.4 x86_64. --jim

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[libvirt-users] [virt-tools-list] How to solve the UID repeatetion problem of virt-clone one WINDOWS virtual machine
by cochen 14 Jun '13

14 Jun '13

Hi all: If I use "virt-clone" to clone a windows virtual machine , the new windows vm is sure be have a uid which the same with the source windows. How can I make them difference auto? Best regards; chencong

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