In this article, we will introduce a list of free and open source monitoring system that is helping you to monitor system resources such as CPU load, the RAM memory usage, network traffic statistics or memory consumption. In this article I’ve listed top 7 web based Linux monitoring tools which can cover almost all aspects of sysadmin’s monitoring tasks. Nagios Nagios monitoring tools This is one of the most popular web based Linux monitoring systems nowadays, actually it’s industry standard for IT infrastructure monitoring. Nagios is licensed under GNU General Public License which gives you permission to copy, broadcast and/or change it under certain conditions obviously. Nagios features: Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.) Monitoring of host resources (processor load, disk usage, etc.) A simple plugin design that allows users to easily develop their own service checks Parallelized service checks Ability to define network host hierarchy using “parent”

מקור: Best Free Monitoring System For Linux