MySQL is the standard solution for free relational database systems in web applications, but new forks, more storage engines, and patched versions muddy the water. Now's the time to take stock of the most important offerings.
The virtualization technology market is currently concentrating on hypervisor-based systems, but hosting providers often use an alternative technology. Container-based solutions such as OpenVZ/Virtuozzo are the most efficient way to go if the guest and host systems are both Linux.
Even securely configured and patched web servers can be compromised because of vulnerabilities in a web application. ModSecurity is an Apache extension that acts as a web application firewall to protect the web server against attacks.
Administrators often write custom monitoring programs to make sure their daemons are providing the intended functionality. But simple shell tools are just as well suited to this task, and not just for systems that are low on resources.
Because Microsoft's legacy VPN protocol, PPTP, has a couple of vulnerabilities, SSTP, which routes data via an SSL connection, was introduced as the new VPN protocol with Vista, Windows Server 2008, and Windows 7.