Answer: Tomcat5 port redirect issue

[Dan <dm...@tsiware.com>]

I figured I would post this in answer to my own question, just in case anyone 
else has the same problem.

The issue was I two boxes set up one had apache, and tomcat on it, the other 
just had tomcat.

The box with apache, and tomcat had tomcat running something unrelated to the 
secondary box.  What I wanted to do was if a particular context was requested 
from the apache/tomcat domain to redirect to the other domain and to the 
appropriate ports (ie 8080/8443) the redirect was simple enough, with a 
rewrite rule in the apache configuration.

RewriteRule "^/({specific context})(.*)" "http://{domain of tomcat 
box}/$1" [R]

for {specific context} you would substitute the context you wish to map to the 
URL on the other domain.
for {domain of tomcat box} substitute the domain of the box you wish to 
redirect to, from the apache box.

this was straight forward enough the trick was to redirect traffic on the 
other box from port 80 to 8080 and port 443 to 8443.

I found these easiest way to do this is by adding iptable rules on the tomcat 
box.

iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080
iptables -t nat -I PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 8443
iptables -t nat -I OUTPUT -p tcp --dport 80 -j REDIRECT --to-ports 8080
iptables -t nat -I OUTPUT -p tcp --dport 443 -j REDIRECT --to-ports 8443

the first 2 rules redirect external incoming requests, and the next 2 redirect 
localhost requests.  (the second isn't always necessary, but in this case it 
was appropriate.)

I hope this helps someone else out of the mess of sorting this sort of thing 
out.

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