apache2 two instances

[Kaushal Shriyan]

On Sat, Aug 21, 2010 at 1:46 AM, Hakan Koseoglu <hakan at koseoglu.org> wrote:
> On 20 August 2010 18:38, Kaushal Shriyan <kaushalshriyan at gmail.com> wrote:
>>>> Can someone please guide me to setup two instances of apache2 along with
>>>> start/stop init.d script for both the instances.
>> What are the implications to have multiple instances of apache2 ?
> Please explain what you are trying to achieve.
> This sounds like someone's homework or project work.
>
> it is doable, it's not worth the hassle with the Ubuntu defaults. Much
> easier to roll your own versions with separate prefixes but even then
> it's not worth the hassle in most cases. We do it with our customers
> to completely isolate  Apache instances from each other on CentOS &
> RHEL but we don't depend on a lot of external libraries. We trim the
> compilation to a few options we require and it turns out to be very
> tight, secure and small. OTOH, we miss out on the automated updates so
> there's a bad side of it.
>
> If you run multiple Apache instances, they must listen on different
> ports (i.e., standard 80 and something else). This is usually more
> easy to manage with virtual servers.
>
> The only reason you should have separate Apache instances is when you
> have conflicting libraries/modules and applications loaded. Again,
> separate applications should be separated by virtual hosts.
>
> You can run multiple instances by having separate config directories
> and running the daemon with additional parameters. You can take a copy
> of /etc/init.d/apache2 and add necessary modifications.
>
> Check apache2's man page. You will be interested with the -f
> parameters to supply a separate Apache config. Default config is in
> /etc/apache2/apache2.conf. Don't forget to change log directories,
> Server root, Listening port.
>
> Then you need to register the new init file and test.
>
> As I said, you can always compile your own Apache to a completely new
> area but that will not pick up any updates and compiling/obtaining
> prerequisites can be a bummer (the combination of Apache 2.2, PHP5 and
> AIX's XLC are a nightmare - count yourself lucky - I've been there,
> still having the nightmares).
> --
> Hakan (m1fcj) - http://www.hititgunesi.org

Thanks Hakan for a detailed explanation and have completely understood
now about the implications

Kaushal