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Re: Mapping in workers2.properties

George Shafik

2004-01-10

Replies:

Magic stuff Mark


*** updated httpd.conf file snippet ***
LoadModule jk2_module modules/mod_jk2.so

<IfModule mod_jk2.c>
JkSet config:file
"/usr/local/jakarta-tomcat-4.1.29/conf/workers2.properties"
</IfModule>

Alias /examples "/usr/local/jakarta-tomcat-4.1.29/webapps/examples"
<Location "/examples">
JkUriSet worker ajp13:sslaptop.gsss.net:8001
</Location>

<Location "/examples/WEB-INF/">
AllowOverride None
deny from all
</Location>
************************************

*** updated worker2.properties file ****
[uri:/examples]
info=Display status information and checks the config file for changes.
worker=ajp13:sslaptop.gsss.net:8001
context=/examples
group=status:status
tomcatId=sslaptop.gsss.net:8001

[uri:/examples/*.jsp]
info=jsp files

[uri:/examples/servlet/*]
info=servlet
*************************

take care,
George



----- Original Message -----
From: "Mark Eggers" <its_toasted@(protected)>
To: "Tomcat Users List" <tomcat-user@(protected)>
Cc: "George Shafik" <gshafik@(protected)>
Sent: Sunday, January 11, 2004 6:16 AM
Subject: Mapping in workers2.properties


> There are actually several ways to map between Apache
> and Tomcat via mod_jk2.
>
> The first is using workers2.properties. If you've
> compiled with -pcre, then perl regular expressions
> should work as well as individual names.
>
> Also, remember that servlets traditionally live in
> /<app-name>/servlet/<servlet-name>. This is
> controlled by the web.xml for the particular
> application (context) and is found in:
>
> $TOMCAT_HOME/webapps/<app-name>/WEB-INF/web.xml
>
> The example context is especially confusing, primarily
> due to the name. In Tomcat 4.1.29, you have the
> following:
>
> /examples/jsp/index.html
> /examples/servlets/index.html
>
> However, the actual location of the servlets according
> to web.xml would be:
>
> /examples/servlet/<servlet-name>
>
> So, in your workers2.properties file you will need to
> have the following in order to map all servlets in the
> examples:
>
> [uri:/examples/servlet/*]
> worker=ajp13:unixsocket
>
> or whatever you called your worker name.
>
> While workers2.properties works well for a small
> number of sites, it does not scale very well since the
> match lookup is linear. Another way to manage mod_jk2
> mapping is detailed in the source of mod_jk2.
>
> I know, I know, reading the source is not supposed to
> be a requirement, but then again this is open source
> so you do have the opportunity.
>
> Anyway, in jk/native2/server/apache2/mod_jk2.c, there
> is a little documentation concerning JkUriSet.
>
> Basically, you use Apache constructs to map the
> location and within that you use the JkUriSet
> directive to map the location to the appropriate
> worker.
>
> I've tried both ways, and they both work well.
> According to the source, using JkUriSet is the
> preferred method.
>
> As for in-process, there has been some discussion on
> this mailing list about why in-process does not work
> with the current MPM (multi-processor modules)
> available for Apache httpd. The real problem seems to
> be that there is currently no MPM that runs all of
> apache within one process in UNIX, using threads
> exclusively to handle separate requests.
>
> Actually, this is not quite true since there is an
> experimental MPM that accomplishes this. However,
> according to the documentation this is slower than the
> current worker model (multi-process, multi-thread) and
> not recommended for production work.
>
> The problem is that when multiple processes get
> started, each process attempts to start its own Tomcat
> (if in-process is being used). This can't be done
> using the same server,xml.
>
> In recent kernels (Redhat 2.4.2x, generic 2.6.0,
> 2.6.1) there has been a new implementation of threads.
> It might be possible to build a new MPM that takes
> advantage of this. As far as I know, this is not
> being done (yet). This sounds like a great
> opportunity to make a contribution :-).
>
> Hope this has been helpful.
>
> /mde/
> just my two cents . . .
>
> __________________________________
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