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From Alessandro Fantuzzi <fantu...@o-one.net>
Subject Re: [users@httpd] Third level domain
Date Tue, 14 Apr 2009 14:25:22 GMT
André Warnier ha scritto:
>
> Check #1:
> Presumably, you have Tomcat right now configured so that if you 
> request "http://www.company.com:8080/site_prod" or 
> "http://www.company.com:8080/site_admin", it calls the corresponding 
> application, right ?
Correct
>
> Check #2:
> I will also suppose that the DNS hostnames "www.company.com" and 
> "admin.company.com" resolve to the same IP address, this being the IP 
> address of the host where Apache and Tomcat are running, right ?
>
Correct
>
> There are different ways in which you can achieve what you want.
>
> In the meantime, considering that you are naming Apache httpd in your 
> configuration, let's suppose for now that you also need the Apache 
> httpd for some other reason, and let's thus do it with a front-end 
> Apache.
I need Apache in front of Tomcat
>
> Even there, there are several possibilities.
>
> You would want Apache (httpd) to act as a front-end for the Tomcat 
> server, and to "distribute" the calls to the /site_prod and 
> /site_admin applications under Tomcat.
> Apache can do that, using either one of the following "proxy modules" :
> - mod_proxy via HTTP
> - mod_proxy via AJP
> - mod_jk via AJP
> Are you familiar with any of those ?
> Is one of them already set up on your system ?
mod_jk
> Do you have a preference ?
I was thinking about mod_jk
>
> Next, presumably, you also want that in the process Apache makes the 
> calls appear like you are calling the top-level (or default) 
> application of two different sites, right ?
> I mean, you want your clients to call
> http://www.company.com  and not http://www.company.com/site_prod
> Yes ?
Correct
>
> So basically, what we want to achieve is :
>
> browser :     http://www.mycompany.com      http://admin.mycompany.com
> 1) goes to :         apache httpd host         same apache httpd host
> 2) changed to:  localhost:xxxx/site_prod      localhost:xxxx/site_admin
>   (where xxxx is the listening port of Tomcat on the same host)
> 3) sent to Tomcat (using mod_proxy_http, mod_proxy_ajp, or mod_jk)
> 4) calls Tomcat app     /site_prod                   /site_admin
> and back
>
> For (1), the DNS part must be working.
It is working
> You will probably also need to understand Virtual Hosts, so you might 
> as well read this too :
> http://httpd.apache.org/docs/2.2/vhosts/
> (read the section about Name-based Virtual Hosts)
> For (2), you will need some rewriting of the URL.
> Read this :
> http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html
> For (3), we will need an Apache/Tomcat Connector.
> If one is already installed and working, it will be a lot easier.
> Is there ?
As you can see from the configuration I posted I am using mod_jk
>
> Otherwise, I suggest mod_jk, but that is only a personal preference, 
> because I know it better than the others.
> For (4), these apps need to be installed and working in Tomcat.
> Are they ? How do you call them, right now ?
The apps are installed and working in Tomcat. I have no problem when I 
call them direcly on Tomcat port like this
http://www.mycompany.com:8080/site_prod
and
http://www.mycompany.com:8080/site_admin

As you said what I want to achieve is calling one this way
http://www.mycompany.com
and the other that way
http://admin.mycompany.com
 
>
>
>> Here are the info about production environment.
>>
>> LINUX   APACHE     2.0.59
>> TOMCAT     5.5.20
>> JVM    1.5
>>
>> I read the documentation for both Apache httpd and Tomcat, and I also 
>> had some testing on my testing environment, which is somewhat different.
>>
>> Windows XP Professional
>> APACHE     2.0.63
>> Tomcat         6.0.14
>> JVM    1.5
>>
>> This is what we want to obtain:
>> when the user calls http://www.site.com the contents must be served 
>> by the application intalled in /site_prod under Tomcat.
>> When the user calls a particular third level domain, say 
>> http://admin.site.com the contents must be served by the application 
>> installed in /site_admin
>>
>> This is how I configured Apache httpd and Tomcat
>>
>> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

>>
>>
>> httpd.conf:
>>
>> here I created two VirtualHosts
>>
>> <VirtualHost *:80>
>> ServerName    admin.site.com
>>
>> DocumentRoot    "webapps/site_admin"
>>
>> JkMount     /site_admin/*.jsp worker1
>> JkMount     /* worker1
>>
>> RewriteEngine on
>>
>> [...](Some rewrite rules)
>>
>> [...](Log files)
>>
>> </VirtualHost>
>>
>>
>> <VirtualHost *:80>
>> ServerName    site.com
>>
>> DocumentRoot    "webapps/site_prod"
>>
>> JkMount     /site_prod/*.jsp worker1
>> JkMount     /* worker1
>>
>> [...](Some rewrite rules)
>>
>> [...](Log files)
>>
>> </VirtualHost>
>>
>> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

>>
>>
>> In server.xml I created two Hosts
>>
>> <Host appBase="webapps\" autoDeploy="true" debug="0" 
>> name="admin.site.com" unpackWARs="true">
>>    <Context debug="1" docBase="web\" path=""/>
>>    <Valve className="org.apache.catalina.valves.AccessLogValve" 
>> directory="logs" pattern="common" prrefix="home_access_log."
>>        resolveHosts="false" suffix=".txt"/>
>> </Host>
>>       <Host appBase="webapps\" autoDeploy="true" debug="0" 
>> name="www.site.com" unpackWARs="true">
>>    <Context debug="1" docBase="web\" path=""/>
>>    <Valve className="org.apache.catalina.valves.AccessLogValve" 
>> directory="logs" pattern="common" prrefix="home_access_log."
>>        resolveHosts="false" suffix=".txt"/>
>> </Host>
>>
>> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

>>
>>
>> What is strange is that when both applications are up and running 
>> everithing seem to go the right way.
>> I mean, when I call www.site.com I get a response from the 
>> application sitting on /site_prod
>> And when I call admin.site.com I get a response from the application 
>> sitting on /site_admin
>> But if I turn off the application installed in /site_admin , instead 
>> of receving an error message, I get a page from the application in 
>> /site_prod
>>
>> I don' t know if this is a correct behaviour or if my configuration 
>> is messed up.
>>
>
>
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-- 

Alessandro Fantuzzi - O-one s.r.l.
E-mail: fantuzzi@o-one.net <mailto:fantuzzi@o-one.net>
Software developer

www.o-one.net <http://www.o-one.net>

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