Re: [libvirt-users] Isolated networks && test lab
On 08/27/2015 08:56 PM, Spanky Horawitz wrote:
Thanks again!
Can you tell me the difference in setting things up that way as
opposed to updating (in Ubuntu) /etc/network/interfaces and adding
physical br(idge) interfaces? On my other test box, I setup networks
the way you describe from https://help.ubuntu.com/community/KVM/Networking
The main difference between libvirt's bridges and a bridge setup as
described on that page is that bridges created by libvirt will never
have a physical ethernet device directly attached, so any communication
to the outside from interfaces connected to a libvirt-created bridge
will need to be routed at L3 by an IP stack on "something" connected
directly to the bridge; that could be another guest which has multiple
interfaces (as you're setting up) or it could be the host itself (when
you configure an IP address on a bridge, that effectively plugs the
host's IP stack into a port on the bridge).
It's possible to configure bridge interfaces with no directly attached
ethernet outside the scope of libvirt in /etc/network/interfaces - just
skip the "bridge_ports" line. The effect is the same, just depends on
where you want your config.
-----Original Message-----
*From*: Laine Stump <laine(a)laine.org
<mailto:Laine%20Stump%20%3claine@laine.org%3e>>
*To*: libvirt-users(a)redhat.com <mailto:libvirt-users@redhat.com>
*Cc*: shorawitz(a)gmail.com <mailto:shorawitz@gmail.com>
*Subject*: Re: [libvirt-users] Isolated networks && test lab
*Date*: Thu, 27 Aug 2015 20:52:04 -0400
On 08/27/2015 08:25 PM, Spanky Horawitz wrote:
> Sorry, just realized there is a VMmanager app too (free version seem
> to only have support for Debian 7 though.) I am using the Virtual
> Machine Manager GUI (virt-manager.)
virt-manager is what I'm talking about (don't know what you mean by
"VMmanager"). Probably the dialogs have changed - mine is v1.2.1.
0.9.5 sounds a bit old, you should see if there is a backport of a
newer version somewhere for whatever distro you're running.
Alternately, it is dirt simple to create a new network that has no IP
address associated with it. Just do this:
1) create a file with these contents:
<network>
<name>mynetname</name>
</network>
2) "virsh net-define filename.xml" (where filename.xml is the file
containing the above XML)
3) "virsh net-autostart mynetname; virsh net-start mynetname"
(all these run as root)
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