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From "David Harris" <>
Subject listen ipaddrs:80 vs *:80
Date Fri, 11 Jun 1999 13:59:10 GMT

Question kind of relating to mass hosting:

How much worse is this:

     Listen ipaddr:80
     <VirtualHost ipaddr:*>
     bla bla bla

repeated for each virtual host, compared to:

     Listen *:80

with just

     <VirtualHost ipaddr:*>
     bla bla bla

repeated for each virtual host.

I understand that the first causes one socket to be opened and the second
causes one socket to be opened for each virtual host. Well, this makes a
larger call to select, but is this a problem? Are all those sockets eating
up file descriptors? This could cause apache problems or also linux kernel
problems, I guess.

I've been using the first method just because it seemed easiest to get
working. It works just fine with my relatively small test setups, but I'm
afraid that it will not scale. Perhaps I should just setup a box with a few
class C's and test it out...

I assume you people running a few thousand virtual domains in a server are
using the second method with a "Listen *:80". This correct?

 - David Harris
   Principal Engineer, DRH Internet Services

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