[libvirt-users] renaming a domain?
by Igor Serebryany
Hi,
I'm trying to figure out if libvirt supports a domain rename
feature, like xen's "xm rename" command. I couldn't find anything in
the docs suggesting such a function. Am I missing something?
Thanks!
--Igor
14 years, 1 month
[libvirt-users] Sporadic network issues
by jeremy avnet
I'm seeing this problem with both the virtio and e1000 driver with both
linux and windows guests. About 5 - 10% of the VMs I launch have network
problems. They seem to always get an IP from the DHCP server (dnsmasq), but
afterwards either they can not make an outside network connection or they
lose connectivity at a later time. Sometimes the connectivity comes back,
sometimes it doesn't. It's very sporadic and there doesn't seem to be any
rhyme or reason to it.
The network is configured like "Routed network config" described here:
http://libvirt.org/formatnetwork.html#examplesRoute
The host machines are on Ubuntu 10.04. We were using the default Lucid
packages (libvirt 0.7.5 / qemu 0.12.3), but I have upgraded us to libvirt
0.8.1 and qemu 0.12.4. I believe this has helped reduce the failure rate,
but it still persists.
Has anyone else had this problem or is there some suggestions for things to
look into?
Thank you.
.:. jeremy
14 years, 1 month
[libvirt-users] 0.8.3 make error
by Haidong Zhu
OS: Ubuntu 9.04
Error output:
CC libvirt_parthelper-parthelper.o
CCLD libvirt_parthelper
libvirt_parthelper-parthelper.o: In function `main':
/home/yoyoadm/libvirt-0.8.3/src/storage/parthelper.c:105: undefined reference to `ped_device_get'
/home/yoyoadm/libvirt-0.8.3/src/storage/parthelper.c:119: undefined reference to `ped_disk_new'
/home/yoyoadm/libvirt-0.8.3/src/storage/parthelper.c:125: undefined reference to `ped_disk_next_partition'
collect2: ld returned 1 exit status
make[3]: *** [libvirt_parthelper] Error 1
make[3]: Leaving directory `/home/yoyoadm/libvirt-0.8.3/src'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/yoyoadm/libvirt-0.8.3/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/yoyoadm/libvirt-0.8.3'
make: *** [all] Error 2
14 years, 1 month
[libvirt-users] howto setup linux guest with 2 nics
by Jan Paulini
hi,
i have the following situation. my host system is running debian lenny
and kvm. i have 2 ethernet interfaces of which i like to use eth0 for
administration of the server itself without traffic from any guest
systems. eth1 is connected to a different switch where i have numerous
vlans. i have successfully setup a guest running virt-install using a
bridge interface on the host system. here the debian config for br1
which i used:
auto eth1.700
iface eth1.700 inet manual
auto br1
iface br1 inet manual
bridge_ports eth1.700
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off
i was now looking into the xml file for the guest hoping to find a way
to use 2 ethernet interfaces for the guest one on br1 and another on br2
where br2 would be configures as br1 above on the host, just in a
different vlan. how can i do that ? the network section of the xml fine
lookes like this:
<interface type='bridge'>
<mac address='54:52:00:xx:xx:xx'/>
<source bridge='br1'/>
<model type='virtio'/>
</interface>
is there possibly a way of installing a guest with virt-install to give
the guest eth0 and eth1 which are in different vlans on the hosts eth1 ?
thanks for your help !
Jan
14 years, 1 month
[libvirt-users] How to force the use of virtio as the guest network driver
by Tony Lewis
I'm running KVM on a standard Debian Lenny host, and I seem to be
hitting the problem identified here:
http://serverfault.com/questions/123566/is-anyone-using-kvm-in-production
My symptom is that using rsync over SSH to transfer files into the guest
gets slower and slower, and then grinds to a halt, and the machine
becomes unreachable.
It seems that I should be using the virtio driver, but I can't seem to
make it load. The KVM guest has the virtio module, (a la find
/lib/modules -name \*virtio\*) but when I try to force it by setting
<model type="virtio"/> in the XML configuration, it seems to make no
difference.
I see that as per http://libvirt.org/formatdomain.html , "qemu -net
nic,model=? /dev/null" returns the following: "ne2k_isa i82551 i82557b
i82559er ne2k_pci pcnet rtl8139", but I have no qemu-kvm binary. Not
sure if that's a telling symptom or not.
Host kernel is 2.6.26-2-openvz-amd64, KVM version is 72+dfsg-5~lenny5,
libvirt version is 0.4.6-10, all of which look good enough to use virtio
according to http://wiki.libvirt.org/page/Virtio .
Thanks,
Tony Lewis
14 years, 1 month
[libvirt-users] performance with libvirt and kvm
by Nirmal Guhan
Hi,
I am seeing a performance degradation while using libvirt to start my
vm (kvm). vm is fedora 12 and host is also fedora 12, both with
2.6.32.10-90.fc12.i686. Here are the statistics from iperf :
>From VM: [ 3] 0.0-30.0 sec 199 MBytes 55.7 Mbits/sec
>From host : [ 3] 0.0-30.0 sec 331 MBytes 92.6 Mbits/sec
libvirt command as seen from ps output :
/usr/bin/qemu-kvm -S -M pc-0.11 -enable-kvm -m 512 -smp 1 -name
f12kvm1 -uuid 9300bfe2-2b9c-d9f0-3b03-9c7fe9934393 -monitor
unix:/var/lib/libvirt/qemu/f12kvm1.monitor,server,nowait -boot c
-drive file=/var/lib/libvirt/f12.img,if=ide,bus=0,unit=0,boot=on,format=raw
-drive if=ide,media=cdrom,bus=1,unit=0,format=raw -net
nic,macaddr=52:54:00:51:7c:39,vlan=0,model=virtio,name=net0 -net
tap,fd=21,vlan=0,name=hostnet0 -serial pty -parallel none -usb -vnc
127.0.0.1:0 -k en-us -vga cirrus -balloon virtio
If I start a similar vm using qemu-kvm directly, the performance
matches with the host.
qemu kvm : [ 3] 0.0-30.0 sec 329 MBytes 91.9 Mbits/sec
TCP window size is 64K for all the cases.
Command used : qemu-kvm vdisk.img -m 512 -net nic,model=virtio
macaddr=$macaddress -net tap,script=/etc/qemu-ifup
Any clues?
Thanks,
Nirmal
14 years, 1 month
[libvirt-users] libvirt and lxc
by Nirmal Guhan
Is anyone using libvirt for lxc ? I am trying to do so and running
into an issue. The system container starts fine with lxc tools and am
able to connect to it.
Here is the snippet of my xml file (rest is same as in
http://libvirt.org/drvlxc.html)
<devices>
<emulator>/usr/libexec/libvirt_lxc</emulator>
<filesystem type='mount'>
<source dir='/lxc/f12'/>
<target dir='/'/>
</filesystem>
<interface type='bridge'>
<mac address='52:54:00:82:87:64'/>
<source bridge='br0'/>
<target dev='tap0'/>
</interface>
<console type='pty'>
<target port='0'/>
</console>
</devices>
Am able to start the container but when I do console :
virsh # console f12lxc
Connected to domain f12lxc
Escape character is ^]
<<hangs here and I press enter, it destroys the domain>>
virsh #
Am running Fedora 12 with 2.6.32.10-90.fc12.i686. I changed target
dev='tap0' to 'veth' and no change in the behavior.
Please help.
Thanks,
Nirmal
14 years, 1 month
