Alessandro Fantuzzi wrote:
[...]
If I don' t go wrong the domain admin.site.com is considered to be a
"third level domain" related to www.site.com
I believe the following :
.com, .biz, etc.. are called "top level domains" or TLD (for obvious
reasons).
mycompany.com, yourcompany.biz etc.. may be called "second-level
domains", which in this case would make "www.yourcompany.biz" AND
"admin.yourcompany.biz" be third-level domains.
The fact that "www" is traditionally chosen for website servers, and
often for convenience made to resolve to the same IP as
"yourcompany.biz", is just a choice. Other than that, the name "www"
for a host has no special DNS meaning as compared to "admin".
But that's not the main issue here.
To summarise : you have one Tomcat, one Apache httpd, and you want :
- that the requests to "http://www.yourcompany.com/"; would go to the
Tomcat application deployed under the /site_prod context
- that the requests to "http://admin.yourcompany.com/"; would go to the
Tomcat application deployed under the /site_admin context
both in the same Tomcat.
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 ?
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 ?
(If not, then that is the first thing that you should organise,
otherwise the rest will not work).
There are different ways in which you can achieve what you want.
The first thing you should now, is that strictly-speaking, to do just
the above, you do not need an Apache httpd in front of Tomcat. You
could do this with Tomcat alone, and it may simplify your configuration
and make your life easier, if you don't need Apache for anything else.
Let us know if you would prefer a Tomcat-only solution.
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.
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 ?
Do you have a preference ?
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 ?
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.
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 ?
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 ?
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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