mod_was_ap22_http.so wrong ELF class: ELFCLASS32

I’m experimenting with running Apache on our servers instead of IBM HTTP Server. This could be an advantage in terms of security updates – if a particular security vulnerability is fixed in Apache, it is going to be much easier to apply it by typing yum update than going to the IBM site and downloading the latest update and then struggling through the WAS Update Installer.

Anyway, when trying this out, I got this error when starting Apache. This error is pretty straightforward :


Starting httpd: httpd: Syntax error on line 993 of /etc/httpd/conf/httpd.conf: Cannot load /opt/WebSphere70/Plugin/bin/mod_was_ap22_http.so into server: /opt/WebSphere70/Plugin/bin/mod_was_ap22_http.so: wrong ELF class: ELFCLASS32


This simply means that the wrong version of the plugin is installed. I’m using 64 bit linux and 64 bit Apache, but the 32 bit version of the WAS Plugin. Reinstalling the 64 bit version made it work fine.