How to make 150k active clients happy?

[Steve van der Burg]

>>> <Heinecke at hansenet.com> wrote:
> I have to design a dhcp infrastructure which is good for:
> ~ 150k active leases
> ~ 2000 subnets, each a /22 network (1018 available IP's each)
> - 4 days lease time
> - failover is a must-have
> - HP hardware running 64Bit debian lenny, 1 or 2 quad-core cpu, min. 4GB RAM) 
> (Fast hardware ist not the problem ...)
> 
> And one 'special' requirement:
> I have to forward agent-circuit.id, leased IP and client hardware address 
> (mac) to a thrid party system on all events (commit|release|expiry) by 
> issuing a http request.
> Regarding this, I think of doing something like "execute('/usr/bin/wget 
> http://1.2.3.4?ip=",param1<http://1.2.3.4?ip=>, param2, ....)"
> 
> So... what do you think? Is there a (good) chance to be successful with ISC 
> 4.x? My feeling is that the  'execute()' call may turn out as showstopper. 
> Any other ideas?

That's about 10x bigger than my client set, but you're right, it sounds doable.

I would make sure that the HTTP requests are uncoupled from the DHCP server's operation.  Instead of launching wget directly, do something else as cheaply as possible (eg. create a small file with the details of the transaction, rename when finished) and have another process watch for those and have it push them off with wget.

...Steve


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