A busy proxy server is something that no self-respecting admin should leave to its own devices. The Squid logfile analyzer, dubbed Sarg by its author, helps you keep your Squid servers on track.

A partly overloaded DNS server can slow down all the workstations on the network. Dnsgraph is an early warning system that gives administrators a graph of critical values. Your Dnsgraph charts will help you keep your systems serving names.

When ports on a host start opening and closing like window shutters in a gale, it’s time for admins to pay attention.

Practical tools such as cat, less, and head are convenient for viewing text.

Monitor and troubleshoot Linux system performance with the free and powerful Orca.