Munin is one of the various systems monitoring tools using RRDtool.
It consists of a munin server where all data is collected and a munin-node daemon from which data is collected.
Official site: munin-monitoring.org
sudo apt-get install munin
Installing munin-node on the servers we want to monitor:
sudo apt-get install munin-node
The configuration files are located in the /etc/munin directory
In the munin-node.conf file, you need to specify the IP address of the server that is allowed to receive information. In munin.conf, the addresses of the clients from which to receive information.