On Nov 21, 2007, at 12:52 PM, Mike wrote:
> Hello,
> I have a problem with my virtual machines. I am using kvm53
> on an AMD Athlon(tm) 64 X2 Dual Core Processor 5000+.
> As distribution I use Ubuntu server 7.10.
> As kernel I use Linux 2.6.22-14-server #1 SMP Sun Oct 14 22:09:15
> GMT 2007 x86_64 GNU/Linux.
>
> I have 3 different vms running. At the beginning they all work
> without a problem.
> Then, after one moment to another one or more stop working.
> I did a ping test to all the machines, the vm with the failure
> stops pinging.
> The result from external ping: Destination host unreachable.
> The same result from a ping onto the main server.
>
> Here are my configuration files:
> cat /etc/qemu-ifup
> #!/bin/sh
> /sbin/ifconfig $1 0.0.0.0 promisc up
> /usr/sbin/brctl addif br0 $1
> sleep 2
> cat /etc/network/interfaces
> auto lo
> iface lo inet loopback
>
> auto br0
> iface br0 inet static
> address 195.24.77.169
> netmask 255.255.255.0
> gateway 195.24.77.1
> bridge_ports eth0
> bridge_stp off
> bridge_maxwait 5
> I use scripts for starting the vms:
> kvm -hda apache.img -hdb apache_storage.img -m 512 -boot c -net
> nic,vlan=0,macaddr=00:16:3e:00:00:01 -net tap -nographic -daemonize
> kvm -hda postfix.img -m 512 -boot c -net
> nic,vlan=0,macaddr=00:16:3e:00:00:12 -net tap -nographic -daemonize
> kvm -hda openvpn.img -m 256 -boot c -net
> nic,vlan=0,macaddr=00:16:3e:00:00:03 -net tap -nographic -daemonize
> The tapN devices are being created at the startup of the vms.
>
> When I run dmesg I have this:
> [ 112.390943] br0: port 2(tap1) entering learning state
> [ 112.391919] br0: port 3(tap0) entering learning state
> [ 112.397605] br0: port 4(tap2) entering learning state
> [ 122.674313] tap0: no IPv6 routers present
> [ 122.729185] tap1: no IPv6 routers present
> [ 122.843901] tap2: no IPv6 routers present
> [ 123.336081] kvm: emulating exchange as write
> [ 127.367940] br0: topology change detected, propagating
> [ 127.367949] br0: port 4(tap2) entering forwarding state
> [ 127.362971] br0: topology change detected, propagating
> [ 127.362977] br0: port 2(tap1) entering forwarding state
> [ 127.362978] br0: topology change detected, propagating
> [ 127.362980] br0: port 3(tap0) entering forwarding state
>
> No indication of a problem, nowhere in the log files.
>
> I don't know if the vms are freezing, or the network forwarding
> stops working.
> I also activated "net.ipv4.conf.default.forwarding=1"
>
> I googled days for that problem, but without a result.
> I hope that maybe you have a solution for this problem. That would
> be great, because I prefer using kvm instead of other
> virtualization systems.
>
> Thank you very much in advance,
> Greetings from Luxembourg.
>
> Have a nice day,
> Mike
I had similar problems for my first week or so of trying to use KVM
for my virtualization needs. My problem was solved by adding a
"model=rtl8139" to the first -net option on the kvm/qemu command.
The default ne2k emulation seems to be broken. Another possibility
is problems with macaddr. In my testing I found that several of my
machines were getting the same macaddr by default so now I specify
them explicitly for each VM (or generate a dummy one based on the
time for testing).
An example from one of my KVMMs (hopefully line wrapping won't
interfere):
/usr/local/bin/qemu-system-x86_64 -name DOM9-BSD62 -hda /vm_img/
bsd_in1/dom9-disk1.qcow \
-hdb /vm_img/bsd_in1/dom9-disk2.raw -m 512 -boot c -smp 2 -usb -
usbdevice tablet -vnc :9 \
-serial telnet::4109,server,nowait -monitor telnet::
4209,server,nowait \
-net nic,vlan=0,macaddr=52:54:09:12:34:56,model=rtl8139 \
-net tap,vlan=0,ifname=tap1,script=/etc/kvm/kvm-ifup
Lynn Kerby
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