muninlite/README

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README for MuninLite
====================
MuninLite is a single Bourne Shell script that implements the Munin
protocoll as well as some Linux specific plugins. The motivation for
developing MuninLite was to provide a simple Munin Node, using inetd
on systems without a full featured Perl and/or bash or a busybox
system.
MuninLite is Copyright (C) 2007 Rune Nordb<64>e Skillingstad
<rune@skillingstad.no> and released under GPLv2 (see LICENSE file)
Features
--------
MuninLite implements the following plugins:
* df
* cpu
* if_
* if_err_
* load
* memory
* processes
* swap
* netstat
* uptime
* interrupts
* irqstats
Included files
--------------
Changelog Changelog
CREDITS Credits to contributors
LICENSE GPLv2 License
Makefile Rules to make munin-node
README This file
TODO Things to do in future releases
VERSION Current version
munin-node.in The MuninLite script skeleton
examples/xinetd.d/munin Sample xinetd configuration
examples/inetd.conf Sample inetd.conf configuration
examples/inetd.busybox Sample inetd.conf configuration for busybox
examples/hosts.deny Sample hosts.deny configuration
examples/hosts.allow Sample hosts.allow configuration
plugins/cpu CPU usage plugin
plugins/df Filesystem usage plugin
plugins/if_ Network interface traffic plugin
plugins/if_err_ Network interface errors plugin
plugins/interrupts Interrupts & context switches plugin
plugins/irqstats Individual interrupts plugin
plugins/load Load average plugin
plugins/memory Memory usage plugin
plugins/netstat Netstat plugin
plugins/processes Number of Processes plugin
plugins/swap Swap in/out plugin
plugins/uptime Uptime plugin
Build requirements
------------------
Make (Not sure what requirements)
Perl (even very old versions should work)
Requirements
------------
Bourne Shell (ash or dash should be sufficient)
grep (simple grep in busybox is sufficient)
sed (simple sed in busybox is sufficient -- but a bit strange...)
cut (cut in busybox is sufficient)
wc (wc in busybox is sufficient)
xargs (xargs in busybox is sufficient)
inetd (inetd in busybox is sufficient)
Installation
------------
Download source and unpack it.
Edit Makefile to suit your choice of plugins
Make munin-node by running "make"
# make
Making munin-node for muninlite version 0.9.14
Adding plugin df
Adding plugin cpu
Adding plugin if_
Adding plugin if_err_
Adding plugin load
Adding plugin memory
Adding plugin processes
Adding plugin swap
Adding plugin netstat
Adding plugin uptime
Adding plugin interrupts
Adding plugin irqstats
Copy munin-node to a suitable location (/usr/local/bin/) and make it
executable (there will be a "make install" at a later release)
# cp munin-node /usr/local/bin
# chmod +x /usr/local/bin/munin-node
Add munin port to /etc/services
# echo "munin 4949/tcp lrrd # Munin" >>/etc/services
Configure inetd or xinetd to fork this script for request on the
munin port (4949).
Sample configuration for xinetd is located in examples/xinetd.d/munin
# cp examples/xinetd.d/munin /etc/xinetd.d
# killall -HUP xinetd
Sample configuration for inetd is located in examples/inetd.conf
# cat examples/inetd.conf >> /etc/inetd.conf
# killall -HUP inetd
Restrict access to munin port using hosts.allow and
hosts.deny or add a rule to your favorite firewall config.
Examples of hosts.allow/deny settings is provided in the examples
directory.
Iptables might be set with something like this:
# iptables -A INPUT -p tcp --dport munin --source 10.42.42.25 -j ACCEPT
Test
----
To test script, just run it (/usr/bin/local/munin-node):
# /usr/local/bin/munin-node
# munin node at localhost.localdomain
help
# Unknown command. Try list, nodes, config, fetch, version or quit
list
df cpu if_eth0 if_eth1 if_err_eth0 if_err_eth1 load memory
version
munins node on mose.medisin.ntnu.no version: 0.0.5 (munin-lite)
quit
For inetd-test, try to telnet to munin port from allowed host.
# telnet localhost 4949
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
# munin node at localhost.localdomain
help
# Unknown command. Try list, nodes, config, fetch, version or quit
list
df cpu if_eth0 if_eth1 if_err_eth0 if_err_eth1 load memory
version
munins node on mose.medisin.ntnu.no version: 0.0.5 (munin-lite)
quit
Connection closed by foreign host.
Plugin configuration
------------------------
To configure which plugins should be enabled, locate the PLUGINS
variable in munin-node and remove unwanted plugins.
There is no specific configuration for plugins.
Munin configuration
-------------------
Configure your /etc/munin/munin.conf as you would for a regular
munin-node.
[some.host.tld]
address 10.42.42.25
use_node_name yes