(Today, with the rapid development of the Internet, we can not ignore the normal operation of the server. At present, there are two types of server monitoring: one is traffic monitoring, such as MRTG, cacti, PRTG, etc. One is server status monitoring. For example, the well-known Nagios, WhatsUp and WhatsUp are programs running on Windows systems. We can use them to monitor whether the server is powered off, disconnected from the network, and whether the service is running normally. We can also monitor the resource occupancy of the server, and realize email and SMS alarms. The functions are very powerful. Please refer to this document for typical WhatsUp applications)
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