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12 Replies Latest reply: Feb 20, 2012 7:31 AM by 832857 RSS

Load Balancing-wrong ELF class: ELFCLASS64

832857 Newbie
Currently Being Moderated
GlassFish 3.1.1
Apache Webserver 2.2.x

To configure the loadbalancing I followed the following link
http://docs.oracle.com/cd/E18930_01/html/821-2426/abdhg.html

However Although the linux machine I am using is 32bit version I am having the following error.
After google search, I have found many points referencing 64compile, but I have properly assigned the corrent flags and compiled it.


+[root@bin]# ./apachectl start+
httpd: Syntax error on line 419 of /usr/local/apacheHttpServer/conf/httpd.conf: Cannot load /usr/local/apacheHttpServer/modules/mod_loadbalancer.so into server: /usr/local/apacheHttpServer/modules/mod_loadbalancer.so: wrong ELF class: ELFCLASS64


+[root@httpd-2.2.22]# file /usr/bin/file+
+/usr/bin/file: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped+

+[root@]# export+
declare -x AS_HOME="/usr/local/glassfish-3.1.1/glassfish"
declare -x CFLAGS="-m32"

Besides that do I need the enable mod_jk for loadbalancing for glassfish App Serv, where mod_jk enabling is not mentioned in the link given above.

Thanks in advance.
  • 1. Re: Load Balancing-wrong ELF class: ELFCLASS64
    RenévanWijk Oracle ACE
    Currently Being Moderated
    Do you know how mod_loadbalancer.so was compiled, looks like it was compiled for 64-bit, and you are linking it with a 32-bit computation.

    You only need to enable the jk listener when you are using mod_jk as the load balancing solution

    An example of setting-up mod_jk can be found here: http://middlewaremagic.com/weblogic/?p=7677 look in the section 'Using the Apache HTTP Server as a front-end'.
  • 2. Re: Load Balancing-wrong ELF class: ELFCLASS64
    832857 Newbie
    Currently Being Moderated
    I am sure it was compiled with 32bit settings, as follows, besides my linux machine is 32bit version , normally it should not be allowed to compile with 64 bit settigs even if i tried to compile with 64bit version

    cd http-2.2_x
    export CFLAGS="-m32"
    ./configure with-mpm=worker with-included-apr --with-ssl=open-ssl-install-path
    prefix=apache-install-path enable-ssl --enable-so


    In addtion,
    for enabling the glassfish loadbalancing, mod_loadbalance.so and loadBalanacer.xml file will be enaought right?

    Edited by: mmc18 on 15-Feb-2012 05:34
  • 3. Re: Load Balancing-wrong ELF class: ELFCLASS64
    RenévanWijk Oracle ACE
    Currently Being Moderated
    "In addtion, for enabling the glassfish loadbalancing, mod_loadbalance.so and loadBalanacer.xml file will be enaought right?"

    Detailed steps can be found here: https://blogs.oracle.com/sprabhu7/entry/install_configure_lb_on_apache
    see the 'Configure LB Plugin for Apache.' section
  • 4. Re: Load Balancing-wrong ELF class: ELFCLASS64
    832857 Newbie
    Currently Being Moderated
    in the link you provided Glassfish 2.x is mentioned, however I want to configure the loadbalancing in Version 3.1.1

    Thanks.

    Edited by: mmc18 on 15-Feb-2012 07:31
  • 5. Re: Load Balancing-wrong ELF class: ELFCLASS64
    RenévanWijk Oracle ACE
    Currently Being Moderated
    You have an Apache 3.*? Where did you download that one? (http://httpd.apache.org/download.cgi)
  • 6. Re: Load Balancing-wrong ELF class: ELFCLASS64
    832857 Newbie
    Currently Being Moderated
    Corrected it,it is Glassfish,
    I am using Glassfish 3.1.1 version.
  • 7. Re: Load Balancing-wrong ELF class: ELFCLASS64
    832857 Newbie
    Currently Being Moderated
    [root@]# file mod_loadbalancer.so
    mod_loadbalancer.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped

    I have found out that, glassfish plugin glassfish-lbconfigurator-3_1_1.jar creates 64bit mod_balancer.so file somehow.

    Edited by: mmc18 on 15-Feb-2012 07:34

    Edited by: mmc18 on 15-Feb-2012 23:21
  • 8. Re: Load Balancing-wrong ELF class: ELFCLASS64
    RenévanWijk Oracle ACE
    Currently Being Moderated
    Could you try with the loadbalancer configurator 3.1 (http://www.oracle.com/technetwork/middleware/downloads/glassfish-301-downloads-326755.html)
    See also the supported operating systems and web servers page - http://docs.oracle.com/cd/E18930_01/html/821-2426/gldbq.html#scrolltoc

    Steps to configure Apache are given here: http://docs.oracle.com/cd/E18930_01/html/821-2426/abdhg.html#scrolltoc

    The steps to install the loadbalancer plug-in are given here: http://docs.oracle.com/cd/E18930_01/html/821-2426/gktkv.html#scrolltoc
  • 9. Re: Load Balancing-wrong ELF class: ELFCLASS64
    832857 Newbie
    Currently Being Moderated
    Hi René van Wijk
    sorry about that but,
    You are only giving references except answering my questions.

    Have you ever been tried to produce mod_loadbalancer.so file via glassfish-lbconfigurator-3_1_1.jar on 32bit machine then run the apache http server?
    if so you are propbably see the error?

    to be sure is mod_balanser.so file is 32bit or 64bit you can type the following command
    file mod_loadbalancer.so
  • 10. Re: Load Balancing-wrong ELF class: ELFCLASS64
    RenévanWijk Oracle ACE
    Currently Being Moderated
    The post above gives you an alternative as the set-up you have is clearly not working.

    "Could you try with the loadbalancer configurator 3.1 (http://www.oracle.com/technetwork/middleware/downloads/glassfish-301-downloads-326755.html)"

    Which is 32-bit for sure, as no 64-bit version was available than, which you can see in the supported operating systems and web servers page - http://docs.oracle.com/cd/E18930_01/html/821-2426/gldbq.html#scrolltoc

    Ahh, who cares anyway
  • 11. Re: Load Balancing-wrong ELF class: ELFCLASS64
    832857 Newbie
    Currently Being Moderated
    I have installed jk-connector module following the instruction in link http://tomcat.apache.org/connectors-doc/
    In this link there is a src file should be complied pointing the <web_server>/bin/apxs, there will be created a mod_jk.so file which has to be reperenced in httpd.conf file web server before starting the web server.

    If you do not want to spend installing and compling jk-connector module, you can download compiled version of jk-module: http://archive.apache.org/dist/tomcat/tomcat-connectors/jk/binaries/linux/jk-1.2.31/i386/


    Thanks all for motivating me to find the real solution.


    -Istanbul-
  • 12. Re: Load Balancing-wrong ELF class: ELFCLASS64
    832857 Newbie
    Currently Being Moderated
    found own solution. but contribution gets me motovated

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