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 it might be not the network that die, but the whole vm can you run the vms with -vnc ? (first vm -vnc :1 secoend vm -vnc :2 third vm -vnc :3) and try to connect to them with vncviewer and see if they are alive?
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