Monitoring Servers,Network Devices with Opmanager

OpManager is a network monitoring software that can automatically discover your network; group your devices into intuitive maps, monitor devices in real-time and alert instantaneously on failure. It serves as a complete network monitoring solution by providing complete fault and performance functionality across your WAN and LAN infrastructure.
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Monitoring Debian Servers Using Monit

monit is a utility for managing and monitoring, processes, files, directories and devices on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.
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Display top CPU processes Using htop

htop is a very competent interactive process viewer for the shell, providing all the functionality — and more — that the top utility does, in an easier and more intuitive way. htop provides easy-to-use menus for most operations and also has support for using a mouse.
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Monitor your Debian/Ubuntu System with saidar

saidar is a curses-based application to display system statistics. Statistics include CPU, processes, load, memory,swap, network I/O and disks I/O along with their free space.
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