How To Install Mod_Security Apache on CentOS 6

Install Mod_Security Apache on CentOS 6

In this tutorial, we will show you how to install Mod_Security Apache on CentOS 6. For those of you who didn’t know, Mod_security is an Apache module that helps to protect your website from various attacks such as cross-site scripting, SQL injection attacks, path traversal attacks, etc. Mod_evasive is an Apache module that helps to prevent HTTP DoS (DDoS) attacks or server brute force attacks. It operates embedded into the web server, acting as a powerful umbrella, shielding applications from attacks.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple. I will show you through the step-by-step installation mod_security apache on CentOS 6.


  • A server running one of the following operating systems: CentOS 6.
  • It’s recommended that you use a fresh OS install to prevent any potential issues.
  • SSH access to the server (or just open Terminal if you’re on a desktop).
  • A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Install Mod_Security Apache on CentOS 6

Step 1. Installing Dependencies for mod_security.

yum install gcc make httpd-devel libxml2 pcre-devel libxml2-devel curl-devel git

Step 2. Download the latest stable release of mod_security source code from their official website to your server.

wget https://www.modsecurity.org/tarball/2.9.0/modsecurity-2.9.0.tar.gz
tar xzf modsecurity-apache_2.9.0.tar.gz
cd modsecurity-apache_2.9.0
make install
cp modsecurity.conf-recommended /etc/httpd/conf.d/modsecurity.conf
cp unicode.mapping /etc/httpd/conf.d/

Step 3. Configuring Mod_Security.

# nano /etc/httpd/conf/httpd.conf
LoadModule security2_module modules/mod_security2.so

Now set the basic rule set in your httpd.conf file. Add the following lines of code at the end of the file:

<IfModule security2_module>
    Include conf.d/modsecurity.conf

Save the changes and restart Apache:

service httpd start

Step 4. Download and configure OWASP (Open Web Application Security Project) core rule set for a base configuration.

cd /etc/httpd
git clone https://github.com/SpiderLabs/owasp-modsecurity-crs.git
mv owasp-modsecurity-crs modsecurity-crs
cd modsecurity-crs
cp modsecurity_crs_10_setup.conf.example modsecurity_crs_10_config.conf

Open the Apache configuration file again, and add the following lines at the end of the file:

# nano /etc/httpd/conf/httpd.conf

Include modsecurity-crs/modsecurity_crs_10_config.conf
Include modsecurity-crs/base_rules/*.conf

Next, restart the Apache service to enable the mod_security module:

service httpd restart

Congratulations! You have successfully installed mod_security apache. Thanks for using this tutorial for installing the mod_security apache web server on centos 6 systems. For additional help or useful information, we recommend you check the official apache website.

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r00t is a seasoned Linux system administrator with a wealth of experience in the field. Known for his contributions to idroot.us, r00t has authored numerous tutorials and guides, helping users navigate the complexities of Linux systems. His expertise spans across various Linux distributions, including Ubuntu, CentOS, and Debian. r00t's work is characterized by his ability to simplify complex concepts, making Linux more accessible to users of all skill levels. His dedication to the Linux community and his commitment to sharing knowledge makes him a respected figure in the field.
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