Applying bonus kernel tweaks
Most operating system kernels are optimized for generalized use. While this does not preclude operation as a server, we have to change a few settings to fully utilize our available hardware. This isn't simply a series of configuration modifications meant to increase performance, but critical kernel-related tweaks meant to prevent outages.
Though, while we're on the subject, there's no reason to not include purely performance-enhancing changes. Getting the most out of our hardware prevents unnecessary operating strain on existing resources. A server running too close to its limits cannot be considered highly-available; an unexpected increase in demand can render a server unusable under the right circumstances.
Getting ready
While the following settings are based on Linux servers, some of the concepts are universal. We'll try to provide enough information to illustrate this. However, keep that in mind for this recipe. Otherwise, look for a directory named /etc/sysctl...
