Category: Revelation

Note to self: Xen config

Once again, my blog becomes my own personal scratch pad for things I want to remember. In this case, what to do with Xen domUs that install udev:

– login to the VM using “xm console ID”
– edit /etc/udev/persistent-net-generator.rules
– insert the following at the top, just below the first comment block:

# No persistent interface names for Xen VMs.
KERNEL==”eth*”, GOTO=”persistent_net_generator_end”

– remove the existing persistence “database”:

rm /etc/udev/rules.d/z25_persistent-net.rules

You’re not expected to understand or care.

Fun fact #143.4

Discovered while trying to debug my nav data loading scripts: The Hendersonville Airport (0A7) and the “W.N.C. Museum Airport” (8NC9) are only 0.03 nautical miles apart, but they’re separate airports. I’m not sure if they’re the closest two ever, but they’re certainly pretty damn close. As a matter of fact, I think this picture Hendersonville Airport from the AirNav.com web site listing for Hendersonville shows both runways, the paved one for Hendersonville and the turf one for the museum. I bet there is a story why they didn’t just build a taxiway between them and call it one airport.

This looks incredibly promising

Thanks to a post by Skud, I’ve discovered Freebase, which is, as Skud described it, “crack for information nerds”. It appears to be exactly what I was hoping to develop or find for my aviation navigation data project – a flexible structured information agregator, almost like a wiki with user definable fields.

You probably can’t see much of it, because right now it’s in alpha and by invitation only, but so far they’ve imported all of Wikipedia and added some links between then, and people have written some demo applications.

Like many AJAX applications, it has a tendency to get the dreaded “a script on this page is running slowly”, but otherwise it’s pretty nifty.