[Seaside] Amazon EC2

[Jason Johnson]

My only nit-pick would be that you're being a bit optimistic about the 
DNS.  Afaik most or all of the ISP's hard code the TTL's to at least 48 
hours, so whatever you
set isn't going to even be looked at.

But I don't think that hurts your picture much does it?

Avi Bryant wrote:
>
> On Sep 6, 2006, at 11:57 AM, Darius Clarke wrote:
>
>> I really like the idea as well.
>>
>> Creating a production application w/o a fixed IP address hosted on
>> their service would be the tricky part.
>
> Yes.  So, say you had a server named control.seaside.st, with a fixed 
> IP, and DNS and Apache + mod_proxy installed.  Say the domain name of 
> your production app was myapp.seaside.st, and control.seaside.st was 
> the authority for that domain.  To begin with, the myapp domain would 
> be pointed to control.seaside.st itself.  The first time a request for 
> myapp came in, control would provision an EC2 instance (from a waiting 
> pool) with the myapp image.  It would then modify its DNS to point 
> myapp to that new EC2 instance, and proxy the request through.  While 
> the DNS change propagated out (you could have a short TTL), it would 
> have to continue to proxy those requests, but eventually everyone 
> would be hitting the EC2 instance directly.
>
> When you want to decommission myapp from that EC2 instance, you do the 
> same thing in reverse: you switch the DNS back to control, and the EC2 
> instance has to stay up for a few minutes until the TTL is over and 
> everyone's cache is updated.
>
> This is a little complex, but has two advantages over the current 
> seasidehosting.st setup:
>
> 1. There are no capacity problems - if it becomes wildly popular, it 
> just means the EC2 bills go up a bit.
> 2. We get perfect sandboxing, rather than requiring a modified VM: 
> each app is running in a separate virtual server so you can let people 
> do whatever they want.
>
> Thoughts, refinements?
>
> Avi
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