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Red Hat / CentOS Install mod_security Apache Intrusion Detection And Prevention Engine

How do I install ModSecurity - an open source intrusion detection and prevention engine for web applications under CentOS / RHEL / Red Hat Enterprise Linux 5.x server?
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Troubleshooting: Apache Webserver Will Not Restart / Start

My CentOS Apache 2 (httpd) webserver will not start. It was working fine but I made few changes to httpd.conf and it is not restarting. What are some things to check in order to solve my issues?
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FreeBSD: Nginx Virtual Hosting Configuration

Q. How do I configure Nginx Web server for virtual hosting (host multiple websites under same IP address - name based virtual hosting)?
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How To Back Up a Web Server

Q. I'm using Red Hat Enterprise Linux based Apache web server. How do I backup my Apache webserver, MySQL and PostgreSQL database to another disk called /backup and then copy it to other offsite backup ssh server called backup.example.com?
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Monitor HTTP Packets ( packet sniffing )

How do I monitor and analyze data transferred via HTTP (apache or lighttpd or nginx webserver) for debugging and security purposes?
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I'm setting up WordPress based blog system under Debian or Ubuntu Linux. I am getting an error which read as follows:


Your PHP installation appears to be missing the MySQL extension which is required by WordPress

How do I fix this problem under Debian or Ubuntu Linux?
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Accessing A Single iSCSI LUN From Multiple Linux Systems

Q. I'd like to share iSCSI storage with our 3 node web server cluster. How can multiple systems access a single iSCSI LUN under Linux operating system? Can I connect multiple servers to a single iSCSI LUN?
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How To Run Linux Web Server / Service on Private IP Network

Q. I've only one public IP address assigned by my ISP using metro Ethernet connection. eth0 has public IP and eth1 is connected to our network switch. How do I configure Linux box to forward traffic to my web server hosted at 192.168.1.100 IP address?
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Start / Stop / Restart Lighttpd Web Server on Linux / Unix

I'm unable to find any command(s) to stop lighttpd web server. How do I stop / start / restart Lighttpd on Debian/Ubuntu Linux installed using apt-get command? How do I restart lighttpd on RHEL / CentOS installed using yum command? How do I restart lighttpd on FreeBSD Unix operating systems?
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FreeBSD: Start / Stop / Restart Nginx Web Server

Q. How do I start / stop / restart Nginx webserver under FreeBSD operating systems? How do I test Nginx web server config file syntax before restarting my server?
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