(Nagios is an excellent network host management software. It is an application for system and network monitoring. It can monitor the host and service under the conditions you set, and give alarm information when the status gets worse and better. Nagios further features include:? Monitor network services (SMTP, POP3, HTTP, NNTP, Ping, etc.);? Monitor host resources (processor load, disk space, memory usage, etc.);? Simple plug-in design enables users to easily extend their service detection methods;? Parallel service checking mechanism;? Have the ability to define the network hierarchy, and use the definition of parent host to express the relationship between network hosts. This relationship can be used to find and clarify the downtime or unreachable status of hosts;? When a service or host problem arises and is solved, the alarm is sent to the contact person (via email, SMS, user-defined methods);? It has the function of defining event handles, which can obtain more problem location when the host or service events occur;? Automatic log rollback;? It can support and realize redundant monitoring of the host;? The optional web interface is used to view the current network status, notification and fault history, log files, etc;)
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