Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.
In Norse mythology Hugin and Munin are the ravens of the god king Odin. They flew all over Midgard for him, seeing and remembering, and later telling him. "Munin" means "memory".
Munin the monitoring tool surveys all your computers and remembers what it saw. It presents all the information in graphs through a web interface. Its emphasis is on plug and play capabilities. After completing a installation a high number of monitoring plugins will be playing with no more effort.
Using Munin you can easily monitor the performance of your computers, networks, SANs, applications, weather measurements and whatever comes to mind. It makes it easy to determine "what's different today" when a performance problem crops up. It makes it easy to see how you're doing capacity-wise on any resources.
Munin uses the excellent RRDTool (written by Tobi Oetiker) and the framework is written in Perl, while plugins may be written in any language. Munin has a master/node architecture in which the master connects to all the nodes at regular intervals and asks them for data. It then stores the data in RRD files, and (if needed) updates the graphs. One of the main goals has been ease of creating new plugins (graphs).
Munin 2.0 is available in repositories for (at least) the following Linux distributions: Debian, Ubuntu, Fedora, Red Hat, Red Hat Enterprise Linux, Mandriva, Gentoo and is also available in FreeBSD ports.
The munin master, node and most core plugins are written in Perl, The master requires perl 5.10 or newer. The node may run on older perls.
There are several alternative implementations of the munin node.
- munin-node-c Munin node and plugins written in C
- munin-node-python Munin Node implementation in python
- munin node for OpenWRT (written in minimal perl)
- Muninlite Munin node written in shell script
- Poor Man's Munin Node A minimal munin node running under inetd/xinetd
Plugins are small, standalone executables. They are easy to write, and can be written in any language. You can find many user contributed plugins in the contrib repository.
Munin can always need more help. Please see the list of tasks if you're looking for something to do.
Please visit our GitHub group and repositories. Due to the workload generated by spam robots and other automated vandalism, most project services has moved there.