(Here I recommend the network monitoring software Nagios. I personally think that its biggest advantage is that it can send fault alarm text messages - as long as the object monitored by Nagios fails, the system will automatically send text messages to the mobile phone. The following is an excerpt from the description of the official website of Nagios: Nagios is an open source software used to monitor hosts, services and networks, and many large enterprises or organizations are using it.)
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