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The Multi Router Traffic Grapher (MRTG) is normally used to draw graph for showing routers and networking devices traffic loading, based on the information polled by using SNMP protocol. A lot of SNMP measures can be used by MRTG, e.g. memory usage, CPU percentage, disk space usage, network response time, etc. The resulting web page can be customized for better formatting.
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 OpenNMS | OpenNMS is a network monitoring system written in Java. It collects information about servers or other machines using SNMP protocol. You can monitor services such as Web Servers, DNS, SSH, etc. If any one of the service is down, or reaches warning level, it will send out notification to administrator. You may customize the notification content and recipients as needed.
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根據 SNMP 提供不同的資訊,MRTG 還可以監測系統效能,只要你在 cfg 檔案中加入,LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt,而 UCD-SNMP-MIB.txt 專門負責提供系統資訊,如 CPU LOAD,idle,記憶體資訊等等,大家可以 google 一下 UCD-SNMP-MIB.txt,就查到相關資料。