System Virtualization

vconsole runs ​Xen. Instances of Xen are configured in /etc/xen/*.cfg and their raw images in /var/img. The Xen host (dom0) is configured in /etc/xen/*.sxp and by our custom bridge creation scripts in /etc/xen/scripts/*-orbit. We have plenty of disk, so we don't bother using LVM2 to share images yet — each domU has its own full image. Most of the instructions we needed are at ​https://help.ubuntu.com/community/XenVirtualMachine/XenOnUbuntuEdgy.

Network Virtualization

Here are the VLANs for our virtualized grid.

vlan	name	usual IP range	notes
31	vgrid1-co	10.71	command console
32	vgrid1-da	10.81	data collection
33	vgrid2-co	10.72	command console
34	vgrid2-da	10.82	data collection
35	vgrid3-co	10.73	command console
36	vgrid3-da	10.83	data collection
37	vgrid4-co	10.74	command console
38	vgrid4-da	10.84	data collection

Here are the IP addresses of the virtual consoles as they interface to their vgrid VLAN.

vgrid side	name	dmz side
10.71.0.10	vconsole1	10.50.71.10
10.72.0.10	vconsole2	10.50.72.10
10.73.0.10	vconsole3	10.50.73.10
10.74.0.10	vconsole4	10.50.74.10

Each virtual console runs on a single system, which has 10.10.0.11 on the regular grid and 10.50.10.11 on the dmz.

10.7n.0.40 is repository2 (frisbee, pxe, and home). 10.7n.0.1 is the PIX interface. The current PIX can only be homed on 25 VLANS, so among these it is only homed on VLAN 31.