Question

mod_jk2 settings in Apache httpd.conf file

Asked by: bryndavies

I am trying to use Apache 2.0.43 and Tomcat 4.1.12, integrated using the mod_jk2-2.0.43.dll on windows XP.

I have previously used mod_jk successfully but am attempting to change to mod_jk2. I have an Include statement in my httpd.conf which pulls in a configuration file mod_jk2.conf, as follows:

LoadModule jk2_module modules/mod_jk2-2.0.43.dll
JkWorkersFile (blah blah)
JkLogFile (blah blah)
JkLogLevel error

However, Apache refuses to start, and outputs a message to the event log:

Invalid command 'JkWorkersFile', perhaps mis-spelled or defined by a module not included in the server configuration.

Presumably the JkWorkersFile, and possibly JkLogFile and JkLogLevel commands have been renamed for mod_jk2 - but what to? I cannot find any information on this on the Apache website.

There seem to be plenty of you guys who are using mod_jk2, so please let me know how I point the dll to the workers2.properties file, and you'll be 50 points better off and I'll be able to sleep easily.

Thanks!

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Asked On
2002-10-23 at 17:29:45ID20380788
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Topic

Apache Web Server

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Answers

 

by: gvinayakPosted on 2002-11-04 at 14:51:01ID: 7408008

Hi!
   I was using an earlier version of apache and tomcat and tried to integrate them and obtained the same error.
   I included the

<IfModule !mod_jk.c>
  LoadModule jk_module c:/winnt/system32/mod_jk.dll
</IfModule>
and followed it IMMEDIATELY with
JkWorkersFile "D:\Program Files\tomcat\jakarta-tomcat-4.0.4\conf\jk\workers.properties"
 and I stopped getting the error.
   Try this and let me know if you still have the error.
cheers

 

by: bryndaviesPosted on 2002-11-04 at 15:32:11ID: 7408136

Thanks gvinayak

I have used mod_jk.dll successfully in the way you have described, but this method does not work with mod_jk2.dll. I get the error described in my original post.

I've given up trying to get mod_jk2 working for the time being as it was becoming too much of a distraction but I am still interested in the solution if anyone knows it.

Bryn

 

by: deichelePosted on 2002-11-04 at 17:13:57ID: 7408433

I have the exact configuration you have running, except under Linux. I know there are a great many undocumented inconsistencies for the connectors, but mine succesfully runs with the same statements that you are using, except that I use mod_jk-2.0.42. It's hit and miss, but it might make a difference.

 

by: serservPosted on 2002-12-11 at 18:22:52ID: 7569636

Apache-2.0.43 and mod_jk2-2.0.43 do not use the same worker properties configuration thatmod_jk-2.0.42.

mod_jk2-2.0.43 expects to find a file in the apache/conf directory named "worker2.properties". It is this file that contains the parameters necessary to run mod_jk2-2.0.43 under Apache-2.0.43.

Here is a sample of the file:

[logger]
level=DEBUG

[config:]
#file=${serverRoot}/conf/workers2.properties
#file=c:/Apache2/conf/workers2.properties
file=C:/"Program Files"/"Apache Group"/Apache2/conf/workers2.properties
debug=0
debugEnv=0

[uriMap:]
info=Maps the requests. Options: debug
debug=0

# Alternate file logger
#[logger.file:0]
#level=DEBUG
#file=${serverRoot}/logs/jk2.log

[shm:]
info=Scoreboard. Required for reconfiguration and status with multiprocess servers
#file=${serverRoot}/logs/jk2.shm
file=C:/"Program Files"/"Apache Group"/Apache2/logs/jk2.shm
size=1000000
debug=0
disabled=0

[workerEnv:]
info=Global server options
timing=1
debug=0
# Default Native Logger (apache2 or win32 )
# can be overriden to a file logger, useful
# when tracing win32 related issues
#logger=logger.file:0

[lb:lb]
info=Default load balancer.
debug=0

#[lb:lb_1]
#info=A second load balancer.
#debug=0

[channel.socket:localhost:8009]
info=Ajp13 forwarding over socket
debug=0
tomcatId=localhost:8009

#[channel.socket:localhost:8019]
#info=A second tomcat instance.
#debug=0
#tomcatId=localhost:8019
#lb_factor=1
#group=lb
#group=lb_1
#disabled=0

#[channel.un:/opt/33/work/jk2.socket]
#info=A second channel connecting to localhost:8019 via unix socket
#tomcatId=localhost:8019
#lb_factor=1
#debug=0

[channel.jni:jni]
info=The jni channel, used if tomcat is started inprocess

[status:]
info=Status worker, displays runtime informations

[vm:]
info=Parameters used to load a JVM in the server process
#JVM=C:\Program Files\Java\j2re1.4.0_01\bin\client\jvm.dll (Read from registry)
#OPT=-Djava.class.path=c:/Tomcat/bin/tomcat-jni.jar
OPT=-Djava.class.path=C:/"Program Files"/"Apache Group"/"Tomcat 4.1"/bin/tomcat-jni.jar
OPT=-Dtomcat.home=C:/"Program Files"/"Apache Group"/"Tomcat 4.1"
OPT=-Dcatalina.home=C:/"Program Files"/"Apache Group"/"Tomcat 4.1"
OPT=-Xmx128M
#OPT=-Djava.compiler=NONE
disabled=0

[worker.jni:onStartup]
info=Command to be executed by the VM on startup. This one will start tomcat.
class=org/apache/jk/apr/TomcatStarter
ARG=start
disabled=0
stdout=C:/"Program Files"/"Apache Group"/Apache2/logs/stdout.log
stderr=C:/"Program Files"/"Apache Group"/Apache2/logs/stderr.log

[worker.jni:onShutdown]
info=Command to be executed by the VM on shutdown. This one will stop tomcat.
class=org/apache/jk/apr/TomcatStarter
ARG=stop
disabled=0

[uri:/jkstatus/*]
info=Display status information and checks the config file for changes.
group=status:

#[uri:127.0.0.1:8003]
#info=Example virtual host. Make sure myVirtualHost is in /etc/hosts to test it
#alias=myVirtualHost:8003

#[uri:127.0.0.1:8003/ex]
#info=Example webapp in the virtual host. It'll go to lb_1 ( i.e. localhost:8019 )
#context=/ex
#group=lb_1

[uri:/examples]
info=Example webapp in the default context.
context=/examples
debug=0

#[uri:/examples1/*]
#info=A second webapp, this time going to the second tomcat only.
#group=lb_1
#debug=0

[uri:/examples/servlets/*]
info=Prefix mapping

[uri:/examples/*.jsp]
info=Extension mapping

[uri:/examples/*]
info=Map the whole webapp

[uri:/examples/servlets/HelloW]
info=Exampel with debug enabled.
debug=10

I hope this helps as I know how frustrating it can be trying to distinguish the differences between the various release of Apache/Tomcat/mod_jk. I'm sure this is documented somewhere but I don't remember where.
 

 

by: periwinklePosted on 2003-12-08 at 05:53:57ID: 9896393

No comment has been added lately, so it's time to clean up this TA.

I will leave a recommendation in the Cleanup topic area with the following recommendation for this question:

Answered by serserv

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

periwinkle
EE Cleanup Volunteer

 

by: petzl420Posted on 2004-04-29 at 17:51:08ID: 10955052

I am trying to get mod_jk2 to work as well, but I have an additional complication in that I have installed apache 1.3 from the FreeBSD ports collection, and the httpd.conf file does not live in $APACHE_HOME/conf as in a std installation.  Instead it lives in /usr/local/etc/apache directory.  When I drop in the workers2.properties file, it does not get recognized.  Is there anything I can put in the httpd.conf file that will allow me to specify exactly the location of workers2.properties?

Thanks,
Jeff

 

by: lnkrishnanPosted on 2004-09-14 at 06:06:19ID: 12053879

I found something that gave me a bit of a surprise. I found out that when giving the following,
    <IfModule !mod_jk2.c>
      LoadModule jk2_module /usr/lib/mod_jk2.so
    </IfModule>
the mod_jk2.so module never got loaded. But when I commented out the IfModule lines, then started Apache, and then restarted Apache again, I got the following:
    WARNING: mod_jk2.so already loaded. Skipping.

This indicates that the mod_jk2.so file had been loaded previously.

But, I've noticed ALL over the web that information is being given only about how to link Apache with mod_jk. Not with mod_jk2. Sites talking about integrating with mod_jk indicate to include the line:
    JkWorkersFile "/var/jk/workers.properties"

This "JKWorkersfile" works only for mod_jk.so.

Question 1:
Does anybody have any idea what the equivalent is for mod_jk2.so????? I have tried giving "JKWorkersfile", "JKWorkerfile", "JK2Workersfile", "JK2Workerfile"... basically all sorts of permitations and combinations. Apache just wont allow this keyword.

Question 2:
In the place where we specify the LoadModule for mod_jk2 (as under)
    LoadModule jk2_module modules/mod_jk2.so
I guess we need to fully qualify the path to mod_jk2 in case mod_jk2 is placed under a different directory other than [Apache_Install_Dir]/modules. Is this right?

20120131-EE-VQP-002

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