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Posted to users@tomcat.apache.org by David Harrison <da...@stress-free.co.nz> on 2007/03/22 21:34:46 UTC
Using the jk connector to join different tomcat contexts with discrete urls
Hi,
I am a little lost when it comes to linking Tomcat to Apache in
circumstances where the urls to not map directly across to each other.
For example I have a Tomcat server with the following applications
deployed:
TOMCAT/app1
TOMCAT/app2
I wish to map different Apache urls across to specific Tomcat
contexts, for example:
http://app1.example.com/ to TOMCAT/app1.
http://app2.example.com/ to TOMCAT/app2
Using the jk connector documentation it is easy to setup the
following direct mapping (with JkMount /app1/* worker and JkMount /
app2/* worker):
http://www.example.com/app1 to TOMCAT/app1
http://www.example.com/app2 to TOMCAT/app2
But what I am after is a workers.properities or Apache directive that
will allow the mapping to be indirect i.e. / -> /app1/ for each
virtual host.
Is something like this possible using the same Tomcat host (and
preferably workers.properties file)?
Regards,
David
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Re: Using the jk connector to join different tomcat contexts with
discrete urls
Posted by Erik Melkersson <er...@liu.se>.
Hi!
Actually I never got JkMount to work, so I would say something like:
<VirtualHost *:80>
ServerName app1.example.com
# you do not want to have a loop
RewriteCond %{REQUEST_FILENAME} !^/app1/
RewriteRule ^/(.*)$ /app1/$1 [PT]
<Location /app1/>
SetEnv JK_WORKER_NAME worker_for_app1
SetHandler jakarta-servlet
</Location>
</VirtualHost>
/Erik
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Re: Using the jk connector to join different tomcat contexts with
discrete urls
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Erik,
Erik Melkersson wrote:
> Hi! I wanted to do something similar. (but without the two virtual
> hosts).
It sounds like a solution might be something like this:
<VirtualHost *:80>
ServerName app1.example.com
RewriteRule ^(.*)$ /app1/$1 [PT]
JkMount /* worker_for_app1
</VirtualHost>
<VirtualHost *:80>
ServerName app2.example.com
RewriteRule ^(.*)$ /app2/$1 [PT]
JkMount /* worker_for_app2
</VirtualHost>
I always forget exactly what mod_rewrite does to the URL (the transform
is obvious, but I mean, how it affects processing), so you might have to
tweak the flags in order to get this to work properly.
- -chris
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Re: Using the jk connector to join different tomcat contexts with
discrete urls
Posted by Erik Melkersson <er...@liu.se>.
Hi!
I wanted to do something similar. (but without the two virtual hosts).
I did like this:
# The directory the user sees
RewriteRule ^/test/aaa/(.*) /tomcat-dir/$1 [PT]
RewriteRule ^/test/bbb/(.*) /tomcat-dir/stuff/$1 [PT]
# The directory tomcat serves the stuff on:
<Location /tomcat-dir/>
SetEnv JK_WORKER_NAME workername
SetHandler jakarta-servlet
</Location>
>> David Harrison wrote:
>>> I wish to map different Apache urls across to specific Tomcat contexts,
>>> for example:
>>> http://app1.example.com/ to TOMCAT/app1.
>>> http://app2.example.com/ to TOMCAT/app2
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Re: Using the jk connector to join different tomcat contexts with discrete urls
Posted by David Harrison <da...@stress-free.co.nz>.
On 23/03/2007, at 8:49 AM, Christopher Schultz wrote:
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>
> David,
>
> David Harrison wrote:
>> I wish to map different Apache urls across to specific Tomcat
>> contexts,
>> for example:
>> http://app1.example.com/ to TOMCAT/app1.
>> http://app2.example.com/ to TOMCAT/app2
>
> This should be relatively straightforward.
>
> First, you'll need two Apache httpd virtual hosts configured.
>
> For each virtual host, just use the appropriate JkMount directives to
> send URI mappings "perhaps just /" to the proper worker.
>
> The only catch is the URIs themselves. If you want / to map to /
> app1, it
> might be easiest to make "app1" into the ROOT application for that
> Tomcat instance, and use two separate Tomcat instances.
Part of this deployment question is getting away with not having to
map a fixed ROOT application for the Tomcat server and instead rely
on automated .war deployment into distinct contexts.
> I believe that using mod_proxy_ajp (instead of mod_jk), you can do
> this
> very easily using something along the lines of
>
> # In VirtualHost app1.example.com
> ProxyPass / ajp13://localhost:8080/app1
>
> # In VirtualHost app2.example.com
> ProxyPass / ajp13://localhost:8080/app2
I had not heard of mod_proxy_ajp and it does look like it would do
what I want when combined with mod_proxy_balancer.
The only problem is the production servers are Apache 2.0 and it
looks like mod_proxy_ajp has been introduced in versions >2.1 :-(
I only wish that the standard mod_jk module would support such an
activity as what is described, I'd prefer to tweak a few JkMount/
workers.properties settings than completely change the entire
production environment :-)
Thanks for the information,
David
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Re: Using the jk connector to join different tomcat contexts with
discrete urls
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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David,
David Harrison wrote:
> I wish to map different Apache urls across to specific Tomcat contexts,
> for example:
> http://app1.example.com/ to TOMCAT/app1.
> http://app2.example.com/ to TOMCAT/app2
This should be relatively straightforward.
First, you'll need two Apache httpd virtual hosts configured.
For each virtual host, just use the appropriate JkMount directives to
send URI mappings "perhaps just /" to the proper worker.
The only catch is the URIs themselves. If you want / to map to /app1, it
might be easiest to make "app1" into the ROOT application for that
Tomcat instance, and use two separate Tomcat instances.
I believe that using mod_proxy_ajp (instead of mod_jk), you can do this
very easily using something along the lines of
# In VirtualHost app1.example.com
ProxyPass / ajp13://localhost:8080/app1
# In VirtualHost app2.example.com
ProxyPass / ajp13://localhost:8080/app2
I believe that this is trickier when using mod_jk. This is one of the
only situations where I've found that mod_proxy_ajp is nicer than mod_jk.
- -chris
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