munin-node data monitoring tool has a variety of plugins with different and sometimes conflicting parameters and configuration options. Finding out what options a plugin takes is typically a matter of looking at the actual Perl file which provides the plugin. Here is a simple overview of some of the more common plugins and their options.
munin-node does not monitor
/etc/munin/plugins or configuration files in
/etc/munin/plugin-conf.d/. You need to
systemctl restart munin-node
to make changes take effect.
HTTP/HTTPS Load Times
This plugin lets you monitor how long wget spends loading one or more web page(s). It takes the arguments
env.requisites to false if the target is any modern HTTPS using website or the load times will be unnaturally high.
It can be enabled with
ln -s /usr/share/munin/plugins/http_loadtime /etc/munin/plugins/http_loadtime
and configured with something like:
[http_loadtime] env.target https://immortalpoetry.com/Immortal_Poetry,https://linuxreviews.org/LinuxReviews env.requisites false
Network Traffic Plugins
Network interface traffic can be monitored with the
if_ plugin. Per-interface monitoring is enabled by creating symbolic links named
if_bond0 etc). Enabling
if_ for interface
enp9s0f0 would be done with:
ln -s /usr/share/munin/plugins/if_ /etc/munin/plugins/if_enp9s0f0
There is a similar plugin named
if_err_ for monitoring network errors, packet drops, and collisions.
if_ plugin has some configuration options you likely do not need:
speed (interface speed, should be autodetected correctly) and
env.warning. These can be set per-interface. Example:
sensors_ plugin will only work if you have
lm_sensors (and the required kernel modules) up and running. It takes three arguments:
|sensors_fan||Monitor fan speeds|
You can only have one graph with all fans, using
sensors_fan2 and so on is not supported.
ln -s /usr/share/munin/plugins/sensors_ /etc/munin/plugins/sensors_fan ln -s /usr/share/munin/plugins/sensors_ /etc/munin/plugins/sensors_temp ln -s /usr/share/munin/plugins/sensors_ /etc/munin/plugins/sensors_volt
This plugin claims it can configured using the following options under
[sensors_*] in a plugin configuration file:
||Override default sensors program path|
||Temperature <n> will not be plotted|
||Fan <n> will not be plotted|
||Voltage <n> will not be plotted|
||Percentage over mininum for warning|
||Percentage over mininum/under maximum for warning|
env.volt_warn_percent are the only options listed in the table above who actually do anything.
/usr/share/munin/plugins/sensors_ does not have any code that would allow it to care about
ignore_ configuration options. Thus, the following configuration is valid according to the documentation but it doesn't do anything at all:
There is a work-around:
lm_sensors can be configured to hide fans and temperatures using configuration files in
will actually accomplish what the above munin-node configuration file example doesn't.
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