Re: VM networking stops working

[Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Mike wrote:
> Izik Eidus schrieb:
>   
>> Mike wrote:
>>     
>>> Izik Eidus schrieb:
>>>  
>>>       
>>>> 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?
>>>>
>>>>     
>>>>         
>>> Thank you for your reply.
>>> I can't connect to the vm if it has died, even with vnc. I tried this 
>>> already, no reply from the host.
>>> I don't have physical access to the server because its located in a 
>>> dc. Only ssh to the host.
>>>   
>>>       
>> ok this mean there is bug in kvm for amd and it not realted to the 
>> network
>> what is the guest that you use? is it 64/32?
>>
>>     
> I'm using Debian Etch 32 Bit for all guests
> with Kernel Linux apache 2.6.18-5-486 #1 Tue Oct 2 23:38:54 UTC 2007 
> i686 GNU/Linux
>
> -------------------------------------------------------------------------
>   
ok but what more interesting me is:
if you run just one vm
is it work?


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