[squeak-dev] Re: Upgrading running servers?
Bert Freudenberg
bert at freudenbergs.de
Fri Apr 4 20:41:47 UTC 2008
On 04.04.2008, at 20:14, Andreas Raab wrote:
> Bert Freudenberg wrote:
>> On 04.04.2008, at 08:42, Avi Bryant wrote:
>>> On Thu, Apr 3, 2008 at 7:25 PM, Andreas Raab <andreas.raab at gmx.de>
>>> wrote:
>>>> We currently don't do this mostly because I'm unaware of a low-
>>>> latency
>>>> proxy/forwarding solution that we could use (obviously we're more
>>>> concerned
>>>> about latency than most web-based services). What do you use to
>>>> redirect the
>>>> incoming connections?
>>>
>>> We use Apache with mod_proxy. This is fine for HTTP (the extra
>>> latency literally gets lost in the noise), but a chattier protocol
>>> would be different, of course. I wonder if someone who knew their
>>> way
>>> around ipfw could rig something up...
>> Yes, iptables magic came to my mind, too. This would have very low
>> latency overhead, I doubt it would be measurable at all.
>
> Can iptables look at the content of a connection? The problem is
> that if a user is in a forum and another one tries to join him, they
> need to end up in the same image (at least right now). And we can't
> use different ports for this - we run through firewalls and NATs and
> all sorts of insane corporate IT setups so the choice of port is not
> completely ours.
Yes, iptables can look at the packet contents, for example using the
u32 module:
http://www.stearns.org/doc/iptables-u32.current.html
You should ask a real expert of course, I never did this myself.
- Bert -
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