Modsecurity On Centos 4.7 64 Bit Architecture
By Ian Scott
Some might have a problem installing Mod Security on Centos 4.7 and 64 bit architectures, if following the instructions on the Modsecurity website.
My webserver has been upgraded to httpd-2.0.52-41 using the CentosPlus repository. I don’t know if others using versions previous to this will have the same problem or not - but it has to with one of mod_security’s requirements: mod_unique_id.
It could be the result of an older httpd.conf file being used in place of the one that might come with a brand new install of Centos and Apache, but my configuration file did not have the module loaded. I had to manually add the following to my httpd.conf file:
LoadModule unique_id_module modules/mod_unique_id.so
Another requirement of mod_security is libxml2. The official documentation at modsecurity.org tells you to add the following line to your httpd.conf file:
LoadFile /usr/lib/libxml2.so
If you are on a 64 bit system, it is likely however that this path is incorrect. What you need to add to your httpd.conf file is this:
LoadFile /usr/lib64/libxml2.so
Hopefully this will help anyone who may be having trouble with installing Mod Security on their webserver. I didn’t even realize that the mod_unique_id module was not loaded until I happened to check the /var/log/httpd/error_log file and noticed lines of something like “mod security requires mod_unique_id.” When I restarted httpd, there was no error message and thought everything was working as it should.
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