Introduction
Munin is a networked resource monitoring tool that can help analyze resource trends. It has an architecture master/node, built for modularity and plug and play. It shows all the information you need in graphs, through a web interface. The Munin framework is written in Perl, and uses RRDTool.
Prerequisites
In order to run Munin, you have to satisfy the following requirements:
- Perl 5.10 or newer
- A web server (this is optional, but we’ll use Apache in this tutorial)
Installation
In order to install Munin on RedHat, CentOS or Fedora, you need the EPEL repository.
Then, just:
# yum install munin-node
on all nodes, and
# yum install munin
on the master.
Install Apache Web Server
If it’s not already installed, install Apache:
# yum install httpd
and then, enable it:
# systemctl enable httpd # systemctl start httpd
Configuration
Node
First, decide which plugins you want to use. The easiest solution is to run the following command:
munin-node-configure --shell --families=contrib,auto | sh -x
After this, you have to configure access. By default, munin node listens on all interfaces, but has a restrictive access list. So, you have to add your Munin master’s IP address, using the cidr_allow statement.
For more information about the syntax, just see Net::Server.
At this point, you cant start the node agent as root.
Master
In the master, you have to add some nodes on /etc/munin/munin.conf configuration file. The syntax is INI-like.
Conclusion
That’s it! If you’ve followed the steps correctly, you now have a resource monitoring tool which will make a huge difference in your work. Enjoy!
