Doesn't have eth0 interface in VM, It can not connect to the Internet directly

[lemon1707]

I had installed Cloud(Ubuntu 11.04 Natty) on 2 machines ( CC,SC,Walrus,Cloud on 1 machine, and Nc on 1 machine). They connect direct to router. Each machine just have one Nic. I installed images from store and test successfully. But when I installed Ubuntu 9.10 Karmic image :

$ sudo kvm -m 512 -drive file=ubuntu9-10.img,if=scsi,index=0,boot=on -boot=c -net nic,model=e1000 -net tap -nographic -vnc :0

Its command talks VM using interface with model e1000 (default of Eucalyptus). And -net tap : connect direct to internet using the host's bridge.

Then, I can log into VM by using Vnc Viewer, but from VM, it can not connect to the internet. I type in VM :
$ ifconfig
It appear just one interface : lo

Please help me to solve that problem. I don't konw why It doesn't have eth0 interface.

[WthIteh]

did u tried:

ifconfig eth0 up

command?

[lemon1707]

One more thing, That is in the /etc/network/interfaces => It have tow interfaces. 'lo' interface and 'eht0' interface. The configuration of eth0
auto eth0
iface eth0 inet dhcp

Then command "ifconfig", just appear "lo" interface with ip. When I command : "ifup eth0", It doesn't work.
Any experts there, please help me correct that problem.
Sorry about my english...

[lemon1707]

thank WthIteh replying,
when i "ifconfig eth0 up". It appear error :
ubuntu@ubuntu: ~$ ifconfig eth0 up
eth0: ERROR while getting interface flags: No such device

Could you give me exactly problem and how to fix that please ?

[WthIteh]

The VM needs a way to know about (virtual) NIC. In this case, kvm and qemu work in the same way. See http://www.linux-kvm.org/page/Networking for details on preparing VM NIC.

[lemon1707]

Hi WthIteh
I had configured br0 for host OS before install VM. Should we have another solution to fix that?
I think you said that is correct problem. When I create image I always use "kvm" command instead of "qemu", but i think in my system, It maybe runs Qemu. Is it important?
Let explain more for me, I spend long time to solve that !

[WthIteh]

Hi WthIteh
I had configured br0 for host OS before install VM. Should we have another solution to fix that?
I think you said that is correct problem. When I create image I always use "kvm" command instead of "qemu", but i think in my system, It maybe runs Qemu. Is it important?
Let explain more for me, I spend long time to solve that !

The qemu and kvm are not (probably) the source of problem.
So where you installed the ifup script? You could also add
"-net tap,script=/path/to/qemu-ifup" option to be sure.

[lemon1707]

hi WthIteh,
I'm in process install Ubuntu 9.10 Karmic, I had adjust the bridge="br0" in /etc/vmbuilder/libvirt/libvirtxml.tmpl, then I restart host OS and relaunch the VM by commnand :
$ sudo kvm -m 512 -drive file=ubuntu9-10.img,if=scsi,index=0,boot=on -boot c -net nic,vlan=0,model=e1000, -net tap -nographic -vnc :0

I log into VM by using VNC viewer and command "ifconfig" -> It appears IP of eth0, connect direct to internet via br0 ( br0 , the bridge of host ).
Now, I finished installation OS, I will register it with UEC. I hope no error happen.
Thank you a lot. I hope you could guide me to bundle successful Ubuntu 9.10 Karmic into UEC.

[lemon1707]

Unfortunately, It's still doesn't work.
When I registerd image onto UEC, It's doesn't work correctly. It's can connect direct to internet when I using the command :
$ sudo kvm -m 512 -drive file=ubuntu9-10.img,if=scsi,index=0,boot=on -boot c -net nic,vlan=0,model=e1000, -net tap -nographic -vnc :0
Then I upload it onto UEC, It doesn't connect to internet, the outsite can't connect to instance too.
It maybe I didn' point the VM's interface to Host bridge's interface.
Could you give me more infomation, WthIteh ?
Please help me, I spend over a week to configure.

[Rusty au Lait]

I had installed Cloud(Ubuntu 11.04 Natty) on 2 machines ( CC,SC,Walrus,Cloud on 1 machine, and Nc on 1 machine). They connect direct to router. Each machine just have one Nic. I installed images from store and test successfully. But when I installed Ubuntu 9.10 Karmic image :

$ sudo kvm -m 512 -drive file=ubuntu9-10.img,if=scsi,index=0,boot=on -boot=c -net nic,model=e1000 -net tap -nographic -vnc :0

Does this mean you loaded a Karmic image onto an instance you downloaded from the store and successfully started and are now trying to run a VM of the Karmic image on your instance?
I am confused as to why you are using kvm and/or Qemu.