Mailing List Archive

Hi users,

I have been using mod_backhand for load balancing.
Now I want to use content aware dispatching techique.
Suppose I have 3 servers-x,y,z.
The web content is not fully replicated on these
servers.
In fact I have divided whole web content to three
parts
each served by one server.

Now here there are two cases for dispatching.
1. If a server doesn't know the contents with other
servers.
In this case Iam using the directive "removeSelf"
so that the server which contains the data will
serve.
2. If a server knows the content what other servers
have.
Here which directive will be useful to redirect
the request to a particular server?
what is the difference between HTTPRedirectToName
and HTTPRedirectToIP?
Can I use these directives for this purpose?
Or any other alternative?
Please reply me with where I should put these
directives and with syntax.

thanks,
ravikumar

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Ravi Kumar Munnangi wrote:

>Hi users,
>
> I have been using mod_backhand for load balancing.
>Now I want to use content aware dispatching techique.
>Suppose I have 3 servers-x,y,z.
>The web content is not fully replicated on these
>servers.
>In fact I have divided whole web content to three
>parts
>each served by one server.
>
> Now here there are two cases for dispatching.
>1. If a server doesn't know the contents with other
>servers.
> In this case Iam using the directive "removeSelf"
> so that the server which contains the data will
>serve.
>2. If a server knows the content what other servers
>have.
> Here which directive will be useful to redirect
> the request to a particular server?
> what is the difference between HTTPRedirectToName
> and HTTPRedirectToIP?
> Can I use these directives for this purpose?
> Or any other alternative?
> Please reply me with where I should put these
>directives and with syntax.
>
>
I am not sure I understand what you are trying to accomplish...

(1) ou say you have three servers and the a given box only knows that it
doesn't have it, so you use removeSelf. This is flawed with more than
two servers. mod_backhand will not proxy any request that has already
be proxied by backhand -- to prevent ping-ponging. So, if one of three
servers doesn't have the content in question, it has a 50/50 chance of
directing to a server that does have it. If it misdirects, that is the
end of life for that request.

(2) HTTPRedirect* are special in that they don't proxy anything. They
redirect on an HTTP level by sending a Loction: HTTP header back. Use
them with care.

It sounds to me like you could do this:

www-1 has content under /1/
www-2 has content under /2/
www-3 has content under /3/

<Directory /path/to/1/>
BackhandFromSO byHostname.so byHostname www-1
</Directory>
<Directory /path/to/2/>
BackhandFromSO byHostname.so byHostname www-2
</Directory>
<Directory /path/to/3/>
BackhandFromSO byHostname.so byHostname www-3
</Directory>

--
// Theo Schlossnagle
// Principal Engineer -- http://www.omniti.com/~jesus/
// Postal Engine -- http://www.postalengine.com/
// Ecelerity: fastest MTA on Earth

Theo,

Thankyou!

ravikumar
--- Theo Schlossnagle <jesus@omniti.com> wrote:
> Ravi Kumar Munnangi wrote:
>
> >Hi users,
> >
> > I have been using mod_backhand for load
> balancing.
> >Now I want to use content aware dispatching
> techique.
> >Suppose I have 3 servers-x,y,z.
> >The web content is not fully replicated on these
> >servers.
> >In fact I have divided whole web content to three
> >parts
> >each served by one server.
> >
> > Now here there are two cases for dispatching.
> >1. If a server doesn't know the contents with other
> >servers.
> > In this case Iam using the directive
> "removeSelf"
> > so that the server which contains the data will
> >serve.
> >2. If a server knows the content what other servers
> >have.
> > Here which directive will be useful to redirect
> > the request to a particular server?
> > what is the difference between
> HTTPRedirectToName
> > and HTTPRedirectToIP?
> > Can I use these directives for this purpose?
> > Or any other alternative?
> > Please reply me with where I should put these
> >directives and with syntax.
> >
> >
> I am not sure I understand what you are trying to
> accomplish...
>
> (1) ou say you have three servers and the a given
> box only knows that it
> doesn't have it, so you use removeSelf. This is
> flawed with more than
> two servers. mod_backhand will not proxy any
> request that has already
> be proxied by backhand -- to prevent ping-ponging.
> So, if one of three
> servers doesn't have the content in question, it has
> a 50/50 chance of
> directing to a server that does have it. If it
> misdirects, that is the
> end of life for that request.
>
> (2) HTTPRedirect* are special in that they don't
> proxy anything. They
> redirect on an HTTP level by sending a Loction: HTTP
> header back. Use
> them with care.
>
> It sounds to me like you could do this:
>
> www-1 has content under /1/
> www-2 has content under /2/
> www-3 has content under /3/
>
> <Directory /path/to/1/>
> BackhandFromSO byHostname.so byHostname www-1
> </Directory>
> <Directory /path/to/2/>
> BackhandFromSO byHostname.so byHostname www-2
> </Directory>
> <Directory /path/to/3/>
> BackhandFromSO byHostname.so byHostname www-3
> </Directory>
>
> --
> // Theo Schlossnagle
> // Principal Engineer --
> http://www.omniti.com/~jesus/
> // Postal Engine -- http://www.postalengine.com/
> // Ecelerity: fastest MTA on Earth
>
>
> _______________________________________________
> backhand-users mailing list
> backhand-users@lists.backhand.org
>
http://lists.backhand.org/mailman/listinfo/backhand-users


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