- Users - libvirt List Archives

[libvirt-users] Live migration: Xen to KVM
by Анатолий Степанов 06 Feb '13

06 Feb '13

Hello! Is there some way to migrate guest OS from one Xen-host to another KVM-host using libvirt? (live migration is highly desirable) (Both hosts have the same hardware, Xen running in full-virtualized mode.)

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[libvirt-users] VMM and puppet/kickstart/vagrant
by Jay Vyas 06 Feb '13

06 Feb '13

Hi guys: I'd like to "scriptify" my virtual machine manager deployment. In particular id like to 1) Configure a 3 node cluster from an ISO 2) Assign static IPs at the vm level, and have those cascade into /etc/hosts 3) Add storage to each machine in the cluster . 4) Set the memory/CPU# for each machine. Is there a way i can automate this task using VMM, or maybe, using VMM in conjunction with puppet/kickstart/vagrant/?... Thanks -- Jay Vyas http://jayunit100.blogspot.com

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[libvirt-users] Managing Live Snapshots with Libvirt 1.0.1
by Andrew Martin 05 Feb '13

05 Feb '13

Hello, I recently compiled libvirt 1.0.1 and qemu 1.3.0 on Ubuntu 12.04. I have performed live snapshots on VMs using "virsh snapshot-create-as" and then later re-merge the images together using "virsh blockpull". I am wondering how I can do a couple of other operations on the images while the VM is running. For example, VM1 is running from the snap3 image, with the following snapshot history (backing files): [orig] <-- [snap1] <-- [snap2] <-- [snap3] 1. Can I revert VM1 to use snap2 while it is live, or must it be shutdown? After shutting it down, is the best way to revert to snap2 to just edit the xml file and change the block device to point to snap2? Afterwards, I believe snap3 would become unusable and should be deleted? 2. If I would like to start a new VM from snap1, is there a way to extract a copy of this snapshot from the chain, to an independent image file? I tried to use "virsh blockcopy" but it returned this error: # virsh blockcopy VM1 vda snap1.qcow2 --wait --verbose error: Requested operation is not valid: domain is not transient Thanks, Andrew

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[libvirt-users] Can't save domain: unexpectedly failed
by Mauricio Tavares 05 Feb '13

05 Feb '13

I am running libvirt 0.9.8, virsh -V Virsh command line tool of libvirt 0.9.8 See web site at http://libvirt.org/ Compiled with support for: Hypervisors: Xen QEmu/KVM UML OpenVZ LXC Test Networking: Remote Daemon Network Bridging Nwfilter VirtualPort Storage: Dir Disk Filesystem SCSI Multipath iSCSI LVM Miscellaneous: AppArmor Secrets Debug Readline in an ubuntu 12.04.1 install. I created a vm client and wanted to save it: root@vmhost:/tmp# /usr/bin/virsh save test /export/vms/dump/test.dump error: Failed to save domain test to /export/vms/dump/test.dump error: operation failed: domain save job: unexpectedly failed root@vmhost:/tmp# cat /var/log/libvirt/qemu/test.log 2013-02-04 17:06:10.792+0000: starting up LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.14 -cpu core2duo,+lahf_lm,+aes,+popcnt,+sse4.2,+sse4.1,+cx16,-monitor,-vme -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -name test -uuid 82758b52-77e9-494c-8a9d-c666949c978c -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/test.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot order=cd,menu=on -drive file=/dev/mapper/vmhost_vg1-test,if=none,id=drive-virtio-disk0,format=raw,cache=none,aio=native -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -drive if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-0-1,readonly=on,format=raw -device ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -netdev tap,fd=19,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:16:3e:6f:9c:6b,bus=pci.0,addr=0x3 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:1 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 root@vmhost:/tmp# Does anyone know what could have caused this? Is there another log I can check for what this unexpected failure really is?

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[libvirt-users] How to connect to console of domain on PowerPC?
by Yin Olivia-R63875 04 Feb '13

04 Feb '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] Networking problem - multiple guests using MacVTap in bridge mode
by Filip Korzeniowski 04 Feb '13

04 Feb '13

Dear list, I am getting strange problems using a setup outlined in the subject. I want to run three guests on a single kvm host. The guests are connected through macvtap directly to the network device 'eth0' of the host using this configuration: <interface type='direct'> <mac address='52:54:00:86:3f:24'/> <source dev='eth0' mode='bridge'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> Each guest is assigned a static ip address, no DHCP is involved. When I start the guests the macvtap links are generated automatically, ifconfig outputs this: macvtap2 Link encap:Ethernet HWaddr 52:54:00:86:3f:24 inet6 addr: fe80::5054:ff:fe86:3f24/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:98 errors:0 dropped:0 overruns:0 frame:0 TX packets:31 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:10946 (10.6 KiB) TX bytes:2184 (2.1 KiB) However, depending on the startup order, only the first two guests are able to reach the network! I can't access the third one. After the initial startup, the last host won't connect to the network even if I restart all the guests in a differnt order. I can only reset this by restarting the host. As far as I have tested this, it really depends on the initial startup order of the guests after a host restart. This seems very strange to me. As I am quite new to all of this, I have no clue how to start searching for the problem here. Can anyone provide me with some hints?

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[libvirt-users] control ip address of VM
by zorg 03 Feb '13

03 Feb '13

HI I have 15 vm (libvirt + kvm) with a network brigde and ip address like 192.168.0.1 VM1 192.168.0.2 VM2 192.168.0.3 VM3 ..... The vm are use by other people and I want to be sure that if someone change the ip of VM3 to 192.168.0.1 it will filter it network traffic for him and can't flood the VM1 What the best way to achieve this Hope I m clear enough

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[libvirt-users] Sanlock gives up lock when VM is paused
by Michael Rodrigues 02 Feb '13

02 Feb '13

Hello, I'm using libvirt and sanlock on qemu-kvm guests. Each guest has it's own Logical Volume for it's root filesystem. Sanlock is configured and working and prevents me from starting the same VM twice on multiple nodes and corrupting it's root filesystem. Each VM's domain XML resides on 2 servers that share the LVM volume group over fiber channel. In testing, I noticed that if I pause a VM on node 1, the sanlock lock is relinquished, and I am able to start the same VM, using the same root filesystem, on node 2. I get a lock error when unpausing node 1's VM if node 2's copy is still running, but by this point, the disk may already be corrupted. Is it necessary that paused VMs don't get to keep their locks? Is there a way to configure sanlock to lock when a VM is paused? Versions: sanlock(-devel, -lib) 2.3-1.el6 libvirt(-lock-sanlock, -client) 0.9.10-21.el6_3.8 I'm using NFS for the lockspace. Thanks, Michael -- Michael Rodrigues Interim Help Desk Manager Gevirtz Graduate School of Education Education Building 4203 (805) 893-8031 help(a)education.ucsb.edu

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[libvirt-users] Live Migration and KSM merging
by James 02 Feb '13

02 Feb '13

Hi, Could anyone provide (or point me to) information on how KSM merging behaves when performing live migrations? Does libvirt perform any special work to trigger KSM scanning of the migrated pages? Any guidance is appreciated. James

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[libvirt-users] How to copy snapshots of a VM to the other computer.
by Jonghee Youn 02 Feb '13

02 Feb '13

Currently, I've tried to move qemu VM image to a new computer. So, I copied VM image files in /var/lib/libvirt/images, VM xml files in /etc/libvirt/qemu, VM snapshot files in /var/lib/libvirt/qemu/snapshot to the same places at the new computer. Everything is OK except snapshot!! When I use "qemu-img info" for the copied VM image, I can see the snapshot list in the result as shown below: root@doc-scheduler:/var/lib/libvirt/images# qemu-img info VM22.img image: VM22.img file format: qcow2 virtual size: 10G (10737418240 bytes) disk size: 1.7G cluster_size: 65536 Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 VM22_A 228M 2013-01-31 10:06:45 00:06:38.110 But, when I use "virsh snapshot-list " for the copied VM, the result is empty as follows: root@doc-scheduler:~# virsh snapshot-list VM22 Name Creation Time State ------------------------------------------------------------ and of course, I can't revert to the snapshot. Please let me know how I can copy my snapshots to the new machine. Thanks.

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