Peter Johnson wrote:
Hi All,
I was discussing with someone two common system architectures for a
web application environment and thought I'd extend it to the Tomcat
community to see their views / thoughts.
If we consider that there are 5 servers available, what is the best
way to utilise them assuming that both Apache and Tomcat are used -
Option 1: all 5 servers run both Apache and Tomcat and requests are
load-balanced across them.
Pro: - avoids the ~50ms delay of sending over network
- resource allocation is more dynamic
True and you should utilize mod_jk's UNIX socket, since it is supposed
to be even faster.
Option 2: 2 servers running Apache passing through to 3 running Tomcat.
Pro: - enhanced security due to tiers
Only if you're expecting the Apache to be hacked, but then it is a
disaster scenario all the way.
So what are peoples' thoughts and views on this?
The main problem with both configs is session replication. If you can
get it right, you're OK. I know that N Tomcats can be clustered and can
have a shared session. How will it work with M Apaches in front of them?
I don't see any obvious trouble, but you should test it.
Nix.
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