= System Virtualization =

vconsole runs [http://www.xensource.com 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/XenOnUbuntuBinaryInstall].  Don't use the Xen packages Edgy/universe, run 6.06 like a sensible Ubuntu admin, and install the xensource binary tarball over it using the given script.  Seriously.

From [http://tx.downloads.xensource.com/downloads/docs/user/#SECTION02220000000000000000 The Xen User Guide]:
  "... MAC address from the range 00:16:3E:xx:xx:xx, assigned by IEEE to !XenSource as an OUI (organizationally unique identifier). !XenSource Inc. gives permission for anyone to use addresses randomly allocated from this range for use by their Xen domains."

We use specific MAC addresses, and manage them with DHCP as if they were otherwise physical devices.

|| mac               || ip          || notes       ||
|| 00:16:3E:00:00:01 || 10.50.71.10 || guest1 eth0 ||
|| 00:16:3E:00:00:02 || 10.71.0.10  || guest1 eth1 ||
|| 00:16:3E:00:00:03 || 10.50.72.10 || guest2 eth0 ||
|| 00:16:3E:00:00:04 || 10.72.0.10  || guest2 eth1 ||
|| 00:16:3E:00:00:05 || 10.50.73.10 || guest3 eth0 ||
|| 00:16:3E:00:00:06 || 10.73.0.10  || guest3 eth1 ||
|| 00:16:3E:00:00:07 || 10.50.74.10 || guest4 eth0 ||
|| 00:16:3E:00:00:08 || 10.74.0.10  || guest4 eth1 ||

= 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.