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Re: [libvirt] Bringing up LXC container from virsh command prompt.



Hi,
I want to create eth0 network interface in the container, which is
linked to br0 bridge in the host machine.
For that, I have created a bridge 'br0' with the IP '172.16.1.10'. Now,
I want to create a network interface eth0 in the container with the IP
'172.16.1.17'. I created the following network XML for the above
requirement.

<network>
  <name>mynetwork</name>
  <uuid>3e3fce45-4f53-4fa7-bb32-11f34168b82b</uuid>
  <bridge name="br0" stp="on" delay="5"/>
  <forward mode="nat" dev="eth0"/>
  <ip address="172.16.1.17" netmask="255.255.255.0"/>
</network>

I am able to define the network, but unable to start the network. The
following error is coming when I start the network with the following
command:
#virsh -c lxc:/// net-start mynetwork
error: Failed to start network mynetwork
error: cannot create bridge 'br0': File exists

Can you please guide me to create a network?

My network interfaces in the host machine is shown below:
br0       Link encap:Ethernet  HWaddr 00:50:BF:27:AA:60  
          inet addr:172.16.1.10  Bcast:172.16.255.255  Mask:255.255.0.0
          inet6 addr: fe80::250:bfff:fe27:aa60/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:80728 errors:0 dropped:0 overruns:0 frame:0
          TX packets:170078 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:54037401 (51.5 MiB)  TX bytes:123567268 (117.8 MiB)

eth0      Link encap:Ethernet  HWaddr 00:50:BF:27:AA:60  
          inet6 addr: fe80::250:bfff:fe27:aa60/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:288 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 b)  TX bytes:30108 (29.4 KiB)
          Interrupt:21 Base address:0x1140 

eth1      Link encap:Ethernet  HWaddr 00:16:76:4B:91:DC  
          inet addr:192.168.1.10  Bcast:192.168.1.255
Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

eth2      Link encap:Ethernet  HWaddr 00:11:95:FC:8D:62  
          inet addr:10.232.113.80  Bcast:10.232.113.255
Mask:255.255.254.0
          inet6 addr: fe80::211:95ff:fefc:8d62/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:563988 errors:0 dropped:0 overruns:0 frame:0
          TX packets:391293 errors:1100 dropped:0 overruns:0
carrier:1100
          collisions:188525 txqueuelen:1000 
          RX bytes:565906426 (539.6 MiB)  TX bytes:234291753 (223.4 MiB)
          Interrupt:22 Base address:0xa000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:23001 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23001 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3478027 (3.3 MiB)  TX bytes:3478027 (3.3 MiB)

Regards,
Srikanth.

-----Original Message-----
From: Daniel P. Berrange [mailto:berrange redhat com] 
Sent: Thursday, March 04, 2010 3:41 PM
To: Kumar L Srikanth-B22348
Cc: libvir-list redhat com; Reddy B Veera-B22347
Subject: Re: Bringing up LXC container from virsh command prompt.

On Thu, Mar 04, 2010 at 03:38:43PM +0530, Kumar L Srikanth-B22348 wrote:
> So, again I need to add one network interface in the libvirt XML?. It 
> will not take the interface which was created earlier while creating 
> container using lxc-tools?.
> But, in the container which was created with lxc-tools(lxc-create, 
> lxc-start ..etc), I am not getting any such issues.

The lxc-XXX tools are completely unrelated. They have a configuration
file where you specify what network interfaces are created. Likewise if
you use libvirt you need to specify what network interfaces are to be
created.

> Why I am getting these issues in virsh command prompt, when I am 
> mounting the same rootfs that was used while creating container using 
> lxc-tools.

You need to setup $PATH in your container.

Daniel
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