After you configure what hosts and services you want to monitor, Nagios schedules regular checks against that host and/or service. If it finds a problem, Nagios does the following: the Nagios site ...

Nagios remains a cornerstone of Linux system performance monitoring, offering unmatched flexibility and reliability. By mastering its setup and configuration, administrators can ensure their systems ...

From network and server monitoring to trending, graphing and even switch and router configuration backups, these utilities will see you through.

Nagios Core is open source, free and has good documentation, but it could use a streamlined install process, updated Web interface and better configuration options.

There are a lot of excellent monitoring tools (Big Brother, Nagios and so on), and some of them allow recovery from dead services, but with great complexity in their configuration, which becomes even ...