Ken Perl wrote:
> Is it possible to make a modperl application to run in cluster?

Of course.

> if yes, how to do that?

The same as any other web system -- multiple machines, a load balancer,
shared data on a database or other system.

> any doc?

Tons of them. Practically any doc about clustering will apply. I wrote
one ages ago about one mod_perl site I worked at:

Is there some specific part you're having trouble getting your head around?

- Perrin