mod_jk causes Apache httpd to fail on startup

OS: Fedora Core 3
Apache: 2.0.52
Tomcat: 5.5.16

I am using the Apache install from the linux dist rpm, tomcat
downloaded from Apache website.

Apache worked as configured when installed, I built a small test site
and could access it.

Tomcat installed, default install and I could access the example pages
via port 8080.

The next step was to install the mod_jk connector module. I downloaded
jakarta-tomcat-connectors-jk-1.2.14-linux-sles9-x86_64-prefo rk.so from
the tomcat site and renamed this binary file to mod_jk.so and placed
it in the Apache modules directory (/usr/lib/httpd/modules). I did a
chmod 775 mod_jk.so to set it's x flags.

At the end of /etc/httpd/httpd.conf I added:

#
# Mod_jk settings
#
JkWorkersFile "/etc/httpd/conf/workers.properties"

JkLogLevel error


# myNewApp is optional, in cse you want to place a new app of your own
in here
#JkMount /myNewWebApp default
#JkMount /myNewWebApp/* default

JkMount /jsp-examples default
JkMount /jsp-examples/* default

LoadModule jk_module modules/mod_jk.so

# End of mod_jk settings


My limited understanding of this is that I should at least be able to
access the example JPS files through Apache with
http://localhost/jsp-examples/ however, I can no longer start Apache.

When I attempt to start Apache, I get this error:

# /etc/rc.d/init.d/httpd start
Starting httpd: Syntax error on line 1039 of
/etc/httpd/conf/httpd.conf:
Cannot load /etc/httpd/modules/mod_jk.so into server:
/etc/httpd/modules/mod_jk.so: cannot open shared object file: No such
file or directory
[FAILED]

Since /etc/httpd/modules/ is linked to /usr/lib/httpd/modules, I do
see mod_jk.so when I do an ls of /etc/httpd/modules.


If I comment out these added lines, httpd starts just fine, but
without the connector.


Since I can see the file in the proper directory with ls, I just don't
understand this error message. Can someone please help me - point me
to good documentation?

Thanks so much in advance -

-- ScottG

Re: mod_jk causes Apache httpd to fail on startup

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Re: mod_jk causes Apache httpd to fail on startup

On Thu, 23 Mar 2006 16:06:59 +0100, Davide Bianchi
wrote:

>On 2006-03-23, Scott Gravenhorst wrote:
>> Cannot load /etc/httpd/modules/mod_jk.so into server:
>> /etc/httpd/modules/mod_jk.so: cannot open shared object file: No such
>> file or directory
>
>Check the permission on the file and your selinux configuation.

# ls -l mod_jk.so
-rwxr-xr-x 1 root root 551410 Mar 22 12:09 mod_jk.so

I erred when I said chmod 775, it is 755.

Contents of /etc/sysconfig/selinux:
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - SELinux is fully disabled.
SELINUX=disabled
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.

Sorry to be ignorant, I have no idea what this does, but it looks to
be disabled.

>This could also meant that mod_jk.so is linked against a library
>that is missing in your system. Try ldd /where/is/mod_jk.so and see
>which libraries it wants. Check if you have all of them

Hmm. Here could be a problem:

# ldd /usr/lib/httpd/modules/mod_jk.so
not a dynamic executable

>Have you considered to compile mod_jk on your own?

I can try that, the reason I did not is that in the Apache Tomcat
documentation it said that it is recommended that the precompiled
binaries be used, so that's what I've been trying to work with.

Many thanks Davide, I'll give compiling the source a shot.

-- ScottG

Re: mod_jk causes Apache httpd to fail on startup

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Re: mod_jk causes Apache httpd to fail on startup

On Thu, 23 Mar 2006 16:48:31 +0100, Davide Bianchi
wrote:

>On 2006-03-23, Scott Gravenhorst wrote:
>> SELINUX=disabled
>>
>> Sorry to be ignorant, I have no idea what this does, but it looks to
>> be disabled.
>
>It allow you to add 'hooks' in the kernel to have a better control of
>what processes can do or cannot do on files, beyond the permissions.
>
>> # ldd /usr/lib/httpd/modules/mod_jk.so
>> not a dynamic executable
>
>Well...
>
>> I can try that, the reason I did not is that in the Apache Tomcat
>> documentation it said that it is recommended that the precompiled
>> binaries be used, so that's what I've been trying to work with.
>
>It never worked for me.
>
>> Many thanks Davide, I'll give compiling the source a shot.
>
>Quick way: get the source codes, cd in /where/you/unpacked/them/native
>./configure ; make
>Then in apache- you should find the mod_jk.so.

Ok, this is almost working, but ./configure says it can't find
Apache... Is there some configuration I need to do? (environment
variable? config file change?)

There _is_ an Apache webserver install in there, very much default.

Re: mod_jk causes Apache httpd to fail on startup

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Re: mod_jk causes Apache httpd to fail on startup

On Thu, 23 Mar 2006 20:13:33 +0100, Davide Bianchi
wrote:

>On 2006-03-23, Scott Gravenhorst wrote:
>> Ok, this is almost working, but ./configure says it can't find
>> Apache... Is there some configuration I need to do? (environment
>> variable? config file change?)
>
>See the README and INSTALL files in there, ./configure --help will give
>you a lot more info.
>


Thank you so much for your help, the BUILDING file had what I needed,
except that I knew nothing about the apxs requirement and had to
suffer through installing the httpd devel packages. But in the end, I
now have an Apache - Tomcat pair, connector installed, that works as
advertised. I can see the jsp-examples files via the Apache
Webserver.


You da man, Davide, thanks!