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[libvirt-users] Adding a second lv as vm drive: how to set the pci part
by Mauricio Tavares 10 Jul '12

10 Jul '12

Let's say I have a vm, vm1, which has a lv as its hard drive: <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source file='/dev/mapper/kvmtest_vm1_rootvg'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> I could add pickles as a second drive as follows: <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source file='/dev/mapper/kvmtest_pickles'/> <target dev='vdb' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </disk> but I am trying to understand the pci address entry. Must drive be on a different slot?

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[libvirt-users] Issue with getCPUStats and getMemoryStats
by Ananth 10 Jul '12

10 Jul '12

Hi, I am facing issue with the calls getCPUStats and getMemoryStats. Please find the error below. AttributeError: 'module' object has no attribute 'VIR_NODE_CPU_STATS_ALL_CPUS' >>> print con.getCPUStats(2, None, 0, 0) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python2.6/site-packages/libvirt.py", line 2173, in getCPUStats ret = libvirtmod.virNodeGetCPUStats(self._o, cpuNum, params, nparams, flags) *AttributeError: 'module' object has no attribute 'virNodeGetCPUStats'* >>> print con.getMemoryStats(2, None, 0, 0) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python2.6/site-packages/libvirt.py", line 2245, in getMemoryStats ret = libvirtmod.virNodeGetMemoryStats(self._o, cellNum, params, nparams, flags) *AttributeError: 'module' object has no attribute 'virNodeGetMemoryStats'* Kind let me know if this is a known issue. I came to know that this issue was fixed in 0.9.8 version of libvirt. I am executing these calls on libvirt-0.9.8 compiled (--with-netcf) on centos 6.2. Please let me know if any other option needs to be specified while compiling libvirt in order to get this working. -- Regards Ananth

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Re: [libvirt-users] virsh iface-list () - function is not supported
by Osier Yang 10 Jul '12

10 Jul '12

On 2012年07月03日 00:42, Ananth wrote: > Thank you. Can you give pointers on how to compile libvirt code? and > documentation available for the same? Sorry for the late response, I'm in vacation. Yes, there is documentation. http://libvirt.org/compiling.html Regards, Osier

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[libvirt-users] OpenVswitch with KVM virtual machines
by Neha Jatav 09 Jul '12

09 Jul '12

Hey, I have KVM installed on my Fedora 17 box. I added the network interfaces of the virtual machines to the openvswitch bridge as follows: ____ ____ / VM1\______br0_______/ em1\ \____/ | \____/ | _|_ /VM2\ \____/ virbr0 is the virtual network switch VM1 and VM2 are on the same subnet having tap interfaces vnet0 and vnet1 respectively. em1 is the default network interface. $sudo ovs-vsctl add-br br0 $sudo ovs-vsctl add-port br0 em1 $sudo ifconfig br0 <ip address of em1> $sudo ip route del default dev em1 $sudo ip route add default dev br0 (Using the above commands, I was able to connect to the internet) $sudo brctl delif virbr0 vnet0 $sudo ovs-vsctl add-port br0 vnet0 $sudo brctl delif virbr0 vnet1 $sudo ovs-vsctl add-port br0 vnet1 $brctl show bridge name bridge id STP enabled interfaces virbr0 8000.52540094e45e yes virbr0-nic vnet0 vnet2 $sudo ovs-vsctl show Bridge "br0" Port "vnet1" Interface "vnet1" Port "br0" Interface "br0" type: internal Port "vnet0" Interface "vnet0" Port "em1" Interface "em1" ovs_version: "1.4.0" $ifconfig em1 em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.66.97.253 netmask 255.255.254.0 broadcast 10.66.97.255 inet6 fe80::226:55ff:fe3e:971c prefixlen 64 scopeid 0x20<link> ether 00:26:55:3e:97:1c txqueuelen 1000 (Ethernet) RX packets 194955 bytes 81216930 (77.4 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 53004 bytes 9477482 (9.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 19 memory 0xf0200000-f0220000 $ifconfig br0 br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.66.97.253 netmask 255.0.0.0 broadcast 10.255.255.255 inet6 fe80::226:55ff:fe3e:971c prefixlen 64 scopeid 0x20<link> ether 00:26:55:3e:97:1c txqueuelen 0 (Ethernet) RX packets 84745 bytes 60302978 (57.5 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44528 bytes 7732040 (7.3 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 By default, the OVS should act as a MAC-layer learning switch. However, the VMs which are in the same subnet can ping each other but the VMs can't ping the host machine (10.66.97.253) & viceversa. Can you tell me where am I wrong in my approach? Thanks and regards, Neha.

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[libvirt-users] guest VM waiting for a symbol at serial console
by Andrey Korolyov 09 Jul '12

09 Jul '12

Hi, Recently I`ve run into weird bug, which may be reproduced in following way: - start qemu virtual machine configured with direct boot and kernel args like 'console=tty0 console=ttyS0,38400n8', connect to serial console, disconnect and then shutdown vm - try to start vm again, machine hangs on booting kernel until I press any key into 'virsh console' session - after first power cycle, this bug remains until host system will be rebooted. This happens only when vm experiencing 'power cycle', rebooting inside same kvm process do fine. guest kernel 3.4.4/3.2.20, libvirt 0.9.12 and qemu-1.1.0

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[libvirt-users] numa query
by kapil jain 09 Jul '12

09 Jul '12

Hi, I have a host machine which contains 4 numa nodes each with 2 GB memory and 4 cpus. I am using qem-kvm hypervisor. I am trying to create a guest with the similar topology (4 numa nodes, with only 2 vcpus and 1 GB memory) as host. Each vcpu is 1-1 pinned to physical cpus(i.e. guest{socket0 cpu0} is pinned to host{socket0 cpu0). But one critical requirement is that one guest socket should not have memory from two host sockets to avoid numa access completely. With the current constructs of numa/topology I am able to create the guest. But memory is not mapped as socket 1-1. numatune is not helping. Please suggest a possible way. Thanks, Kapil

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[libvirt-users] Metadata accessible within guests
by Renich Bon Ciric 09 Jul '12

09 Jul '12

Hello, I'd like to know if there is any way to make metadata; for example, the public part of an SSH, accessible within a Guest? This would be very useful in order to provide access to Guests in an automated way. For example, let's suppose I have an implementation that gives a user the power to create Guests. The user has stored his public SSH key in my implementation. After the user creates a Guest, I can inject (with a proper rc.local script or something of the sorts) his/her SSH key properly. This would be useful for a million things. Another cool feature would be that I could sync the root password with the SPICE/VNC password. anyway, if there is a way to store metadata into an XML and, maybe, access it with some tool from within the Guest, this would be awesome. Thank you for your time. -- It's hard to be free... but I love to struggle. Love isn't asked for; it's just given. Respect isn't asked for; it's earned! Renich Bon Ciric http://www.woralelandia.com/ http://www.introbella.com/

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[libvirt-users] Why the xen vm memory won't bloon
by Tony Huang 09 Jul '12

09 Jul '12

Hello, I have a vm with startup xml file has currentmemory = 256M and memory=1024M. However, once the vm started up, the memory allocation won't change. xentop shows that the memory keeps in 256M. How can I make the vm to allocate more memory when they needed. -- Tony

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[libvirt-users] CPU usage by libvirtd
by Zhihua Che 06 Jul '12

06 Jul '12

Hi, I employed libvirt to monitor 50 domains in one node(host). my monitor calls libvirtd for every stats such as cpu, memory, disk every 10 sec. All my requests are made in one thread. And I found that the libvirtd may cost 30% or above cpu time. Is it normal in my case? I tried to reduce this cpu consumption and found some variable in libvirtd.conf and got a little confused by variables like max_clients, max_workers, max_requests. In my opinion, max_clients limits the number of virConnect created by app. max_workers limits the number of thread to handle requests from clients. Does that mean requests from one client may be handled in multi-thread way if max_workers is greater than max_workers? max_request limits the concurrent RPC calls according the comments in libvirtd.conf. I wonder if it can improve the response time if I give a higher value in the case that all my requests are made in one thread? I've tried several different configurations and they didn't reduce the cpu usage effectively.

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[libvirt-users] Problem halting/restaring a lxc container from within
by david＠dit.upm.es 05 Jul '12

05 Jul '12

Hi, I've been making some tests with libvirt and LXC and found some problems when halting/restarting a LXC container from within. Basically, on a Ubuntu 12.04 system with libvirt installed as package (0.9.8), I've created a basic container image with: lxc-create -t ubuntu -n lxc And started it using the libvirt XML listed below and the following command: virsh -c lxc:// create lxc.xml I can access the container console normally but when I issue a halt or reboot command from inside, the container initiates the halt/reboot execution but it does not finishes it properly. For example: $ sudo halt -p [sudo] password for ubuntu: Broadcast message from ubuntu@my-container (/dev/pts/0) at 23:19 ... The system is going down for power off NOW! ubuntu@my-container:~$ acpid: exiting * Asking all remaining processes to terminate... [ OK ] * All processes ended within 1 seconds.... [ OK ] * Deconfiguring network interfaces... [ OK ] * Deactivating swap... [fail] * Unmounting weak filesystems... [ OK ] umount: /run/lock: not mounted mount: / is busy * Will now halt The container seems to finish the shutdown process but libvirt does not seem to be signaled about it (virsh shows the container is still executing). Something similar happens with reboot. However, if a start that container with: lxc-start -n lxc and do the same test, it works perfectly: # sudo halt -p [sudo] password for ubuntu: Broadcast message from ubuntu@my-container (/dev/lxc/console) at 23:17 ... The system is going down for power off NOW! ubuntu@my-container:~$ acpid: exiting * Asking all remaining processes to terminate... [ OK ] * All processes ended within 1 seconds.... [ OK ] * Deconfiguring network interfaces... [ OK ] * Deactivating swap... [fail] umount: /run/lock: not mounted mount: cannot mount block device /dev/disk/by-uuid/9b50a43d-98c3-45ad-a540-7fcbc629a418 read-only * Will now halt # Any idea about how to investigate/solve this problem?? Thanks in advance, David Fernandez -- lxc.xml file -- <domain type='lxc'> <name>lxc</name> <memory>524288</memory> <os> <type>exe</type> <init>/sbin/init</init> </os> <vcpu>1</vcpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/lib/libvirt/libvirt_lxc</emulator> <filesystem type='mount'> <source dir='/var/lib/lxc/lxc/rootfs'/> <target dir='/'/> </filesystem> <interface type='network'> <source network='default'/> </interface> <console type='pty'/> </devices> </domain>

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