Although there wasn't too many comments on my what would you pay for? post I did get some mails.
I was reminded about this via Mario Langs post, which echoed a couple of private mails I received.
Despite being something that I take for granted, perhaps because my hosting comes from the Bytemark, people do seem willing to pay money for DNS hosting.
Which is odd. I mean you could do it very very very cheaply if you had just four virtual machines. You can get complex and be geo-fancy, and you could use anycast on a small AS, but really? You could just deploy four virtual machines0 to provide a.ns, b.ns, c.ns, d.ns, and be better than 90% of DNS hosters out there.
The thing that many people mentioned was Git-backed, or Git-based DNS. Which would be trivial if you used tinydns, and no much harder if you used bind.
I suspect I'm "not allowed" to do DNS-things for a while, due to my contract with Dyn, but it might be worth checking...
ObRandom: Beat me to it. Register gitdns.io, or similar, and configure hooks from github to compile tinydns records.
In other news I started documenting early thoughts about my caching reverse proxy, which has now got a name stockpile.
I wrote some stub code using node.js, and although it was functional it soon became callback hell:
- Is this resource cachable?
- Does this thing exist in the cache already?
- Should we return the server's response to the client, archive to memcached, or do both?
Expressing the rules neatly is also a challenge. I want the server core to be simple and the configuration to be something like:
is_cachable ( vhost, source, request, backened )
{
/**
* If the file is static, then it is cachable.
*/
if ( request.url.match( /\.(jpg|png|txt|html?|gif)$/i ) ) {
return true;
}
/**
* If there is a cookie then the answer is false.
*/
if ( request.has_cookie? ) { return false ; }
/**
* If the server is alive we'll now pass the remainder through it
* if not then we'll serve from the cache.
*/
if ( backend.alive? ) {
return false;
}
else {
return true;
}
}
I can see there is value in judging the cachability based on the server response, but I plan to ignore that except for "Expires:", "Etag", etc ,etc)
Anyway callback hell does make me want to reexamine the existing C/C++ libraries out there. Because I think I could do better.
Tags: caching, dns
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