Munin
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Revision as of 02:24, 24 May 2006
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Munin
Munin is a plain monitoring program with no notification possibility. It uses rrd to store and create graphs for servers. It can use SNMP to monitor windows servers.
http://munin.projects.linpro.no/
How Munin works
Munin has a sort of client / server solution, although the server is just a script that collects the data in certain time periods.
The client is a node to which the server scripts connect and collect data.
Setup Client (Node)
remark for non debian systems, it might be different
install the munin-node package and open the /etc/munin/munin-node.conf file.
The only things you need to change here is the host_name and the allow part. The host_name is the server name (FQDN). allow is a regex formated IP which are allowed to access the node.
allow ^127\.0\.0\.1$
allow ^192\.168\.\d{1,3}\.\d{1,3}$
after changes the munin-node has to be restartet. To see if the node works, connect to it:
telnet <node ip> 4949
you will be greeted with a simple screen:
Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. # munin node at linux-debian-clemens.tokyo.tequila.jp
you can use the following commands list, nodes, config, fetch, version, quit
Setup Server
Setting up the server is not more difficult. For Linux/Unix nodes it is nothing more than adding a small config entry into the /etc/munin/munin.conf file.
Basic settings are there the db (rrd files), html, log etc is. At least see that the htmldir is correctly set.
Because the graphs are by default a bit too small - line breaks in the legend make them too high - increase the width to 500
graph_width 500
a normal linux/unix node is added like this
[host.domain.net]
address 192.168.20.15
use_node_name yes
for adding a windows node please see the excellent guide on the munin homepage: http://munin.projects.linpro.no/wiki/HowToMonitorWindows
one very important remark A windows entry in the server config file has NOT the ip address from the target server but from the munin server instead. Second the use_node_name has to be turned off
[uni.tokyo.tequila.jp]
address 127.0.0.1
use_node_name no
MORE CONFIG SETTINGS FOR GROUPINGS NEEDED
Show Graphs
point your browser to the server where munin runs. In the default the munin directory is in the document root of the default host, eg http://foo.com/munin/
--gullevek 04:24, 24 May 2006 (CEST)
