[Zope-dev] Re: Timing the opening of network ports

[Tres Seaver]

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Andreas Jung wrote:
> 
> 
> --On 29. August 2006 18:37:45 +0100 Chris Withers
> <chris at simplistix.co.uk> wrote:
> 
>> Tres Seaver wrote:
>>>> Unlike you, I prefer when the browser waits until Zope
>>>> has come up over me  having to reload manually until it
>>>> finally is ready...
>>>
>>> The branch Andreas just merged leaves the "fast-bind" option on by
>>> default.
>>
>> Cool, although I can't really see the use ;-)
>>
> 
> The usecase is pretty simple:  you have a loadbalancer and remove  one
> backend Zope. The LB detects the removal and stops forwarding request.
> When the client comes back (means Zope opens the ports early) the LB
> will start forwarding to the client although it might take a while until
> the Zope instance is really up and ready to serve request. So by opening
> the ports late we are able to reduce the latency and avoid pending
> requests.

The other reason for wanting "early binding" to the ports is if the
ports are in the "reserved for root" range (< 1024);  in that case, the
ports *must* be bound early, before dropping privileges to those of the
"effective user".


Tres
- --
===================================================================
Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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