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From "Nuno Branco" <nbranc...@gmail.com>
Subject Apache2 / Tomcat5 / mod_jk - Problem with load balancer
Date Thu, 04 Oct 2007 10:03:18 GMT
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 The HOWTOs I found in the net must be outdated since I'm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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