Author: LEB Have you ever wished you could monitor the performance of your server after the fact? Or did you ever want to get some statistics of your server, about it’s performance and the amount of resources used? Look no further: Munin is here! Munin is a resource monitoring tool that helps you monitor server performance and analyze problems after they happened. Munin uses RRDtools, a data logging and graphing system, for storing and displaying logged data. It’s plug and play and has over 500 plugins available. It’s open source and freely available. In addition to all that, it has networking capabilities so a monitoring master can hold the data for all nodes in a cluster (more on that next week). So, I’m going to show you how to set up and configure Munin on a single node and check those graphs. As usual, written for and tested on both CentOS and Ubuntu.