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From "Felix Schumacher" <felix.schumac...@internetallee.de>
Subject Re: Apache2 / Tomcat5 / mod_jk - Problem with load balancer
Date Thu, 04 Oct 2007 10:54:59 GMT
Hi Nuno,

I would think you have configured mod_jk to use worker1 as the only worker
in apache. You should use the loadbalancer worker in mod_jk.conf like

JkMount /myapp/* loadbalancer

and change your worker.properties to inlude the loadbalancer worker in the
worker.list property like

worker.list=loadbalancer,worker1,worker2

And I believe that you can remove worker1 and worker2 from that list if
your are not accessing them directly from any JkMount directive.

HTH
 Felix
Am Do, 4.10.2007, 12:03, schrieb Nuno Branco:
> Hello list,
>
> This is my first post so treat me gently :)
>
> I'm trying to configure Apache + Tomcat with load balancing capabilities
> and
> I'm planning to use mod_jk to accomplish this, unfortunately I have not
> been
> very successfull. The HOWTOs I found in the net must be outdated since I'm
> not really acomplishing anything usefull, also because apache is
> complaining
> about some options (as I will post below) that the HOWTO told me to put in
> the worker.properties file indicating that these options are deprectated.
>
> So here is my setup:
> Apache 2.2.6
> Tomcat 5.5.26
> mod_jk 1.2.25 (was the name of the .tgz I downloaded)
>
> My workers.properties looks like this:
>
>     workers.tomcat_home=/usr/local/tomcat/
>     workers.java_home=/usr/local/sdk/jdk
>
>     ps=/
>
>     worker.list=worker1, worker2
>
>     worker.worker1.port=20009
>     worker.worker1.host=rh01
>     worker.worker1.type=ajp13
>     worker.worker1.lbfactor=1
>
>     worker.worker2.port=8009
>     worker.worker2.host=rh02
>     worker.worker2.type=ajp13
>     worker.worker2.lbfactor=1
>
>     worker.loadbalancer.type=lb
>     worker.loadbalancer.balance_workers=worker1, worker2
>
>     worker.inprocess.type=jni
>     worker.inprocess.class_path=$(workers.tomcat_home
> )$(ps)lib$(ps)tomcat.jar
>     worker.inprocess.cmd_line=start
>     worker.inprocess.jvm_lib=$(workers.java_home
> )$(ps)jre$(ps)lib$(ps)i386$(ps)classic$(ps)libjvm.so
>     worker.inprocess.stdout=$(workers.tomcat_home
> )$(ps)logs$(ps)inprocess.stdout
>     worker.inprocess.stderr=$(workers.tomcat_home
> )$(ps)logs$(ps)inprocess.stderr
>
> I then start the tomcat servers and the apache server, this comes from the
> mod_jk.log:
> [Thu Oct 04 09:17:39 2007] [27191:3086042816] [warn]
> jk_map_validate_property::jk_map.c (412): The attribute '
> worker.inprocess.class_path' is deprecated - please check the
> documentation
> for the correct replacement.
> [Thu Oct 04 09:17:39 2007] [27191:3086042816] [warn]
> jk_map_validate_property::jk_map.c (412): The attribute '
> worker.inprocess.cmd_line' is deprecated - please check the documentation
> for the correct replacement.
> [Thu Oct 04 09:17:39 2007] [27191:3086042816] [warn]
> jk_map_validate_property::jk_map.c (412): The attribute '
> worker.inprocess.jvm_lib' is deprecated - please check the documentation
> for
> the correct replacement.
> [Thu Oct 04 09:17:39 2007] [27191:3086042816] [warn]
> jk_map_validate_property::jk_map.c (412): The attribute '
> worker.inprocess.stdout' is deprecated - please check the documentation
> for
> the correct replacement.
> [Thu Oct 04 09:17:39 2007] [27191:3086042816] [warn]
> jk_map_validate_property::jk_map.c (412): The attribute '
> worker.inprocess.stderr' is deprecated - please check the documentation
> for
> the correct replacement.
> [Thu Oct 04 09:17:39 2007] [27191:3086042816] [info] init_jk::mod_jk.c
> (2775): mod_jk/1.2.25 initialized
>
> The server works fine and apache is giving me static content and the
> tomcat
> standing at rh01 host is giving me dynamic content. For testing purposes I
> do a shutdown to the tomcat server at rh01 and the mod_jk.log reports:
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> jk_open_socket::jk_connect.c (473): connect to 127.0.0.1:20009 failed
> (errno=111)
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> ajp_connect_to_endpoint::jk_ajp_common.c (891): Failed opening socket to (
> 127.0.0.1:20009) (errno=111)
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> ajp_send_request::jk_ajp_common.c (1311): (worker1) error connecting to
> the
> backend server (errno=111)
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> ajp_service::jk_ajp_common.c (2085): (worker1) sending request to tomcat
> failed,  recoverable operation attempt=1
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> jk_open_socket::jk_connect.c (473): connect to 127.0.0.1:20009 failed
> (errno=111)
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> ajp_connect_to_endpoint::jk_ajp_common.c (891): Failed opening socket to (
> 127.0.0.1:20009) (errno=111)
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> ajp_send_request::jk_ajp_common.c (1311): (worker1) error connecting to
> the
> backend server (errno=111)
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info]
> ajp_service::jk_ajp_common.c (2085): (worker1) sending request to tomcat
> failed,  recoverable operation attempt=2
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [error]
> ajp_service::jk_ajp_common.c (2097): (worker1) Connecting to tomcat
> failed.
> Tomcat is probably not started or is listening on the wrong port
> [Thu Oct 04 10:06:36 2007] worker1 rh01 0.002234
> [Thu Oct 04 10:06:36 2007] [27308:3086042816] [info] jk_handler::mod_jk.c
> (2277): Service error=0 for worker=worker1
>
> It seems not to even try to go to rh02, just gives up when it is unable to
> reach rh01. On the browser I get a typical 503 error.
>
> So if anyone has this setup running I would love to ear possible solutions
> to work around this.
>
> Thank you,
> Nuno
>



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