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From "Sheryl" <gubyd...@his.com>
Subject Re: [users@httpd] Re: Can I have 2 httpd servers running on 2 different ports?
Date Thu, 25 Feb 2010 19:00:11 GMT

>> What benefit does this give you over running VirtualHost?
>>
>
> (I wouldn't set up a second instance like suggested, but..)

Curious about why not...

BTW, my example was a little simplified.  In practice we actually make a
link "base" which points to the apache directory and the link bin to
base/bin, etc.  That way, when we compile a new version we put it in its
own directory and change the link.  Easy to upgrade, easy to back off if
it doesn't work.

More recently we have been moving toward multiple compiles because we're
trying to put everything in its own stack in preparation for moving to
VMs. But we still do the linking in order to make upgrades easier.

> 1) You can load different modules in different instances
> 2) Separation of concerns
> 3) Different global configuration options
> 4) Different compile time options

All of those apply, but most of it has to do with what I assume you mean
by (2).  We have several different customer groups and many applications.
Although we do run VirtualHost, each instance of apache belongs to one
organizational entity.  That way, two groups with different missions don't
have to agree on a restart for changing a paramter (and for that matter
don't have to agree to the change, which relates to (3) above).  Also,
easier to co-ordinate software upgrades.

> For instance, on our reverse proxies, we run two instances of apache,
> one handles SSL and runs prefork MPM, and one handles regular HTTP and
> runs the event MPM.
>
> Cheers
>
> Tom
>
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