Personally - I prefer the 2 apache + 3 tomcat approach.
With 2 apache's you have your needed redundancy. The apaches can also be used
to use the many modules for decorating any requests. (Such as mod_headers to
add selectively add cache-control headers)
Since the tomcats will probably need more CPU for processing - its easier to
add and manage them while not touching the apache servers.
Its also easier to size the servers too since apache and tomcat will not be
competing for resources.
If one of the apaches were to fail - you can also designate one of the
tomcats to start apache and handle the load / redundancy.
-Tim
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
Option 2: 2 servers running Apache passing through to 3 running Tomcat.
Pro: - enhanced security due to tiers
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