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[Updated] Install Cacti (Network Monitoring) on RHEL/CentOS 8/7 and Fedora 3

Cacti tool is an open-source web-based network monitoring and system monitoring graphing solution for IT business. Cacti enable a user to poll services at regular intervals to create graphs on resulting data using RRDtool. Generally, it is used to graph time-series data of metrics such as network bandwidth utilization, CPU load, running processes, disk space, etc.