Custom failover settings?

You can change DNS via the API using the domain.resource.update method. When you detect that your Linode fails, hit that with the new target IP address and it will pick it up on the next refresh.

Determining when your Linode fails is an exercise for the reader, but a cron job involving curl or wget from your friend's server would probably do nicely.

@hoopycat:

You can change DNS via the API using the domain.resource.update method. When you detect that your Linode fails, hit that with the new target IP address and it will pick it up on the next refresh.

Determining when your Linode fails is an exercise for the reader, but a cron job involving curl or wget from your friend's server would probably do nicely.

Is it good way to implement DNS-failover?

It's a way to implement it, and will work, although there's quite a few ways for it to fail. For "business-class" production stuff, I'd generally use an already-implemented solution like DNS Made Easy.