[kwlug-disc] Multiple NICs on Ubuntu Server 14.04

[CrankyOldBugger]

This is great stuff, Khalid.  Thanks!!

I'm going to shuffle a portion of my network around tonight hopefully to
line up with what you've given me here.  Thanks to your help I now have a
better image in my head of what I'm shooting for.  I'll let you know how I
get along.

Tsk tsk tsk ... traitors and infiltrators in our midst ... ;-)
>

No, no, not traitor; convert!  I should have said "this WAS much easier..."
 I haven't touched Hyper-V in over a year now.  I'm really looking forward
to logging in remotely to my first CLI-created Linux VM very soon!





On 15 August 2014 11:30, Khalid Baheyeldin <kb at 2bits.com> wrote:

> On Fri, Aug 15, 2014 at 10:40 AM, CrankyOldBugger <
> crankyoldbugger at gmail.com> wrote:
>
>>
>> virbr0    Link encap:Ethernet  HWaddr ca:e3:65:49:dc:e4
>>           inet addr:192.168.122.1  Bcast:192.168.122.255
>>  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:0
>>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>>
>>
>> Don't ask me why virbr0 is there.  (Google tells me it's there because I
>> started tinkering with KVM at some point but I never finished the task.)
>>
>
> Yes, I have that too, and yes, it is caused by libvirt/kvm. And it is not
> from configuration in /etc/network/interfaces.
>
>
>> I want to start building virtual machines on this box, but before I do I
>> would like to see the server using both NIC cards appropriately.
>>
>
> You can make both cards work by putting something like this in your
> /etc/network/interfaces
>
>
> auto eth0
> iface eth0 inet dhcp
>
> auto eth1
> iface eth1 inet dhcp
>
> The above will make both interfaces come up at boot, and configure
> themselves via DHCP, so the router assigns them an IP address, ...etc
>
> Or you can assign that manually using something like:
>
> auto eth0
> iface eth0 inet static
>         address 192.168.0.2
>         netmask 255.255.255.0
>         network 192.168.0.0
>         broadcast 192.168.0.255
>         gateway 192.168.0.1
>
> auto eth1
> iface eth1 inet static
>         address 192.168.0.3
>         netmask 255.255.255.0
>         network 192.168.0.0
>         broadcast 192.168.0.255
>         gateway 192.168.0.1
>
> This means the first NIC will get 192.168.0.2 and the second will be .3,
> assuming that the router is at .1.
>
>
>> By that I mean it will share the load between any future VMs between the
>> two NICs,
>>
>
> I am not sure what share the load means, or if there is a real answer to
> it as asked. So I will leave that to others who know more than me.
>
>
>> or at least reserve one NIC for the host server and one NIC for the VMs.
>>
>
> This can be done in /etc/network/interfaces as well. Assuming you want the
> VMs to use only the 2nd network card, then you add:
>
> auto br0
> iface br0 inet dhcp
>         bridge_ports eth1
>
> And when creating a VM, via libvirt, you say:
>
> sudo virt-install --name vm_name ... --network bridge=br0 ...
>
> This tells libvirt to use the bridge br0, which uses eth1, which you have
> configured separately.
>
> I have not tried this specifically, but it "should work" (yeah, famous
> words!)
>
>  (I'm ashamed to say this is much easier in MS Hyper-V, but I would much
>> rather learn how to do this in Linux CLI!)
>>
>
> Tsk tsk tsk ... traitors and infiltrators in our midst ... ;-)
>
>
>> So I guess my question is two-fold:
>>
>> a) how do I tame my NICs in preparation for setting up VMs, and
>>
>
> See above.
>
>
>>  b) what's the preferred method for setting up VMs in Ubuntu Server?
>>  Does anyone know of a good how-to link?
>>
>
> If you have kvm capable server, then use libvirt. You create VMs using
> virt-install on the command line, and use virt-viewer to see the BIOS and
> console output, and manage them using virsh.
>
> Or wait till November, when I will cover all this in a presentation for
> KWLUG.
> --
> Khalid M. Baheyeldin
> 2bits.com, Inc.
> Fast Reliable Drupal
> Drupal optimization, development, customization and consulting.
> Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
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> For every complex problem, there is an answer that is clear, simple, and
> wrong." -- H.L. Mencken
>
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