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