[one-users] Network Configuration - IP assignment

[Shantanu Pavgi]

I think most hypervisors can assign MAC address dynamically on their own. I haven't used Xen so I am not sure about it, but KVM and VMware ESXi can auto-generate MAC addresses. Also, the VMware ESXi has a separate range for manually (non-ESXi) assigned MAC addresses [1] [2].

See:
1. http://kb.vmware.com/kb/507
2. http://libvirt.org/drvesx.html#macaddresses



On Jan 17, 2012, at 10:50 AM, Javier Fontan wrote:

I was not aware of kvm assigning MAC addresses. If that setup suits
your needs then go for it, You should have no problem with it.

On Tue, Jan 17, 2012 at 5:24 PM, Shantanu Pavgi <pavgi at uab.edu<mailto:pavgi at uab.edu>> wrote:

Thanks for the reply Javier.

I was able to create a VM by specifying only network interface name in the NIC section. I left MAC address assignment over to the hypervisor (KVM) which assigns MAC address to a VM if it's not specified in the VM definition file. So in this case OpenNebula didn't have any knowledge of the MAC and IP address assigned to this VM. I am not sure whether this will impact OpenNebula's VM management functionality though. Any thoughts?

Following is an example VM definition. OpenNebula version: 3.0.

{{{
# Capacity section
NAME = ttylinux-01
MEMORY = 128
CPU = 1

# OS and Boot section
OS = [
 ARCH = i686,
 BOOT = hd ]

FEATURES = [ acpi = "no" ]

# Graphics I/O
GRAPHICS = [
 TYPE = "vnc",
 PORT = "-1",
 keymap = "en-us" ]

# Disk devices
DISK = [
 IMAGE_ID = "0" ]

# Network interface
NIC = [
  BRIDGE = br0 ]
}}}


--
Shantanu

On Jan 16, 2012, at 5:05 AM, Javier Fontan wrote:

Hello,

Even if the VM's wont get the IP's form OpenNebula the MAC address
must be generated. Internally MAC addresses are tied to Virtual
Network leases so a place in a Virtual Network is needed. Just add a
class B or C network and everything should work ok.

You can also manually generate the mac addresses and you wont need the
Virtual Network, in VM template:

NIC=[MAC="00:02:01:23:45:67", IP="10.0.0.1", BRIDGE="br0"]

But this is more cumbersome as you will need to manually generate
different mac addresses for every interface.

Bye

On Mon, Jan 16, 2012 at 1:50 AM, Shantanu Pavgi <pavgi at uab.edu<mailto:pavgi at uab.edu>> wrote:

I am not following how OpenNebula handles network configuration for the VMs. I am trying to create a virtual network using network config file as follows:
{{{
NAME = "Test Network"
TYPE = RANGED
BRIDGE = br0
PUBLIC=" yes"
}}}

In my test setup I have a DHCP server for IP address assignment. So I did not put NETWORK_ADDRESS and NETWORK_SIZE values, thinking OpenNebula doesn't need to know about it. However I got following error upon 'onvnet create' command.

{{{
[VirtualNetworkAllocate] Error allocating a new virtual network. No NETWORK_ADDRESS in template for Virtual Network.
}}}

I am not sure what values should I provide in a network definition file if IP address and MAC address assignment is not going to be handled by OpenNebula. How does OpenNebula use NETWORK_ADDRESS and NETWORK_SIZE values during VM deployment?

--
Thanks,
Shantanu
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--
Javier Fontán Muiños
Project Engineer
OpenNebula - The Open Source Toolkit for Data Center Virtualization
www.OpenNebula.org<http://www.OpenNebula.org> | jfontan at opennebula.org<mailto:jfontan at opennebula.org> | @OpenNebula
_______________________________________________
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--
Javier Fontán Muiños
Project Engineer
OpenNebula - The Open Source Toolkit for Data Center Virtualization
www.OpenNebula.org<http://www.OpenNebula.org> | jfontan at opennebula.org<mailto:jfontan at opennebula.org> | @OpenNebula

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