Nagios (http://www.nagios.org/) - Nagios is a computer system monitoring, network monitoring, and infrastructure monitoring software application. Nagios offers monitoring and alerting services for servers, switches, applications, and services. It alerts the users when things go wrong and alerts them a second time when the problem has been resolved.
Features
- Network services monitoring (SMTP, POP3, HTTP, NNTP, ICMP, SNMP);
- Hosts status monitoring (CPU usage, disk usage, system logs, etc.);
- Support remote control via SSH;
- Support of different plugins with a simple architecture and feasibility of virtually any programming language (Shell, C/C++, Perl et cetera) ;
- Parallel test of services;
- The function of the hierarchy of hosts on the network with the ability to identify problems and unreachable hosts;
- Send notification after the status change of system objects;
- Automatic rotation of log files;
- Ability to create a distributed monitoring system through the collaboration of several monitoring systems;
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