Config examples

[Jerome Moliere <jm...@perform.fr>]

Hi,
i'm using Tomcat + Apache 1.3.11 + mod_jserv + mod_ssl
I'd like to map all URLs coming to my web server into servlets 
invokation, using the mod_jserv apache module.
I've included the path_to_tomcat.conf files , specified the location 
of the Web.xml file but i keep getting error pages from my server.

mod_ssl seems to get the requests, with a 200 status ( they might be 
forwarded, am I wrong?) but servlets are never invoked?

Any clue?config examples?
thanks in advance.
Jerome

Re: Load Balancing

[Jean-Luc Rochat <jn...@cybercable.fr>]

Shachor Gal wrote:
> 
> > Is anyone working on load balancing for tomcat.
> > If so GREAT, when can we get it :)
> > If not
> > Any ideas and thoughts so far on this?
> > Is it something I can take up?
> >
> 
> As a concept, Tomcat inherits the Jserv code that handled load balancing.
> The problem is that this code is currently partially broken... session
> state will not work correctly!!!
> 
> As soon as I will be able to check code into the CVS I will fix that and
> let you know... Hopefully sooner then later.
> 
> Now, for how it is working...
> Apache (or any other web server) is first accepting the request, when it
> finds out that the request should go to Tomcat it need to decide who is
> the Tomcat process to be used. Deciding that can be based on something
> like round robin but then you also need to support session affinity to the
> JVM where the session started.
> 
> Jserv (as well as other servlet engines) solved this problem by embedding
> the JVM id inside the session id sent to the client. Currently this part
> is broken so sessions will not work (at all).
> 
>         Gal Shachor
> 
Hi Gal,

go on ! I was just planning to rewrite parts of this code, but sounds
cool to work on this with others and get it working soon.

Jean-Luc

RE: Load Balancing

[Angsuman Chakraborty <an...@technologist.com>]

That sounds GREAT! And thanks for the details.
I was wondering if we could make the balancing algorithm pluggable, say by
using factory pattern.
Does the tomcat acting as http server support this? say 4 tomcat server
running with one of them as a leader(assuming the role of apache in the
current scenario) which delegates the task to the others.
What do you think of the idea?

I am currently playing around with tomcat and I have to say this has
undoubtedly the coolest build procedure I have seen in a long time, not to
mention a lot of other cool things.

Great job!

Angsuman

-----Original Message-----
From: Shachor Gal [mailto:shachor@techunix.technion.ac.il]
Sent: Wednesday, February 16, 2000 1:40 PM
To: tomcat-dev@jakarta.apache.org
Subject: Re: Load Balancing




> Is anyone working on load balancing for tomcat.
> If so GREAT, when can we get it :)
> If not
> Any ideas and thoughts so far on this?
> Is it something I can take up?
>

As a concept, Tomcat inherits the Jserv code that handled load balancing.
The problem is that this code is currently partially broken... session
state will not work correctly!!!

As soon as I will be able to check code into the CVS I will fix that and
let you know... Hopefully sooner then later.

Now, for how it is working...
Apache (or any other web server) is first accepting the request, when it
finds out that the request should go to Tomcat it need to decide who is
the Tomcat process to be used. Deciding that can be based on something
like round robin but then you also need to support session affinity to the
JVM where the session started.

Jserv (as well as other servlet engines) solved this problem by embedding
the JVM id inside the session id sent to the client. Currently this part
is broken so sessions will not work (at all).

	Gal Shachor


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Re: Load Balancing

[Shachor Gal <sh...@techunix.technion.ac.il>]

> Is anyone working on load balancing for tomcat. 
> If so GREAT, when can we get it :)
> If not
> Any ideas and thoughts so far on this?
> Is it something I can take up?
> 

As a concept, Tomcat inherits the Jserv code that handled load balancing.
The problem is that this code is currently partially broken... session
state will not work correctly!!!

As soon as I will be able to check code into the CVS I will fix that and
let you know... Hopefully sooner then later.

Now, for how it is working...
Apache (or any other web server) is first accepting the request, when it
finds out that the request should go to Tomcat it need to decide who is
the Tomcat process to be used. Deciding that can be based on something
like round robin but then you also need to support session affinity to the
JVM where the session started.

Jserv (as well as other servlet engines) solved this problem by embedding
the JVM id inside the session id sent to the client. Currently this part
is broken so sessions will not work (at all).

	Gal Shachor

Load Balancing

[Angsuman Chakraborty <an...@technologist.com>]

Is anyone working on load balancing for tomcat. 
If so GREAT, when can we get it :)
If not
Any ideas and thoughts so far on this?
Is it something I can take up?

Angsuman