On Fri, 2009-11-27 at 12:12 -0500, Kelvin Edmison wrote: > On 26/11/09 10:16 PM, "Tait Clarridge" <[email protected]> wrote: > > > On Fri, 2009-11-27 at 14:02 +1300, Steven Ellis wrote: <snip> > > > > So if I have this right, at the basic level you wish to have: > > > > - One interface for Host machine > > - Multiple interfaces for guest traffic > > > > If your environment supports VLANs (802.1Q), might I suggest a trunk > > port on eth1 split up into different bridges to have the KVM guests go > > through to get on different VLANs/address spaces. > > > > This is what I currently do for Xen and it works great. What kind of > > network setup to you have? > > Could you please provide some pointers on how you accomplished this? I've > been attempting to set up a similar configuration without success. > > Thanks, > Kelvin >
Sure.
The way we would do it for a 2 NIC box would be:
eth0 - VLAN trunk
eth1 - Storage Network VLAN
After you have been given a trunk port with a native vlan (for eth0,
allowing you to set an IP for this connection) you can run or script the
following:
- Load the VLAN module
modprobe 8021q
- Use vconfig to add VLAN interfaces
- This is going to assume that eth0 is your trunk port
- eg. vconfig add eth0 <vlan number>
- So for VLAN 22 it would be:
vconfig add eth0 22
- Add the bridge for xen to use (requires bridge-utils package)
- eg. brctl addbr xenbr<vlan#>
- VLAN 22 would be:
brctl addbr xenbr22
- Add the VLAN interface to the bridge
- eg. brctl addif xenbr<vlan#> eth0.<vlan#>
- VLAN 22 would be:
brctl addif xenbr22 eth0.22
- Bring both the bridge and the VLAN interface up
- eg. ifconfig eth0.<vlan#> up
- eg. ifconfig xenbr<vlan#> up
- VLAN 22 would be:
ifconfig eth0.22 up
ifconfig xenbr22 up
If you wanted to script it to run at boot time you can create a simple
for loop with a list of VLANs to use.
In this case I want to use VLANS:
- 2
- 4
- 6
- 8
- 200
- 120
The script would start as follows:
#!/bin/bash
VLANS="2 4 6 8 200 120"
modprobe 8021q
for i in $VLANS
do
# above commands go here
# starting from vconfig add eth0 22
# just change 22 from the examples to $i
done
If you have any trouble, let me know.
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