collectd-nagios - Nagios plugin for querying collectd
collectd-nagios -s socket -n value_spec -H hostname [options]
This small program is the glue between collectd and nagios. collectd collects
various performance statistics which it provides via the
see collectd-unixsock(5). This program is called by Nagios, connects to the
UNIX socket and reads the values from collectd. It then returns OKAY,
WARNING or CRITICAL depending on the values and the ranges provided by
The following arguments and options are required and understood by
collectd-nagios. The order of the arguments generally doesn't matter, as long
as no argument is passed more than once.
- -s socket
Path of the UNIX socket opened by collectd's
- -n value_spec
The value to read from collectd. The argument is in the form
- -H hostname
Hostname to query the values for.
- -d data_source
Each value_spec may be made of multiple "data sources". With this option you
can select one or more data sources. To select multiple data sources simply
specify this option again. If multiple data sources are examined they are
handled according to the consolidation function given with the -g option.
- -g none|average|sum
When multiple data sources are selected from a value spec, they can be handled
differently depending on this option. The values of the following meaning:
No consolidation if done and the warning and critical regions are applied to
each value independently.
The warning and critical ranges are applied to the average of all values.
The warning and critical ranges are applied to the sum of all values.
The warning and critical ranges are applied to the ratio (in percent) of the
first value and the sum of all values. A warning is returned if the first
value is not defined or if all values sum up to zero.
- -c range
- -w range
Set the critical (-c) and warning (-w) ranges. These options mostly
follow the normal syntax of Nagios plugins. The general format is
"min:max". If a value is smaller than min or bigger than max, a
warning or critical status is returned, otherwise the status is
The tilde sign (~) can be used to explicitly specify infinity. If ~ is
used as a min value, negative infinity is used. In case of max, it is
interpreted as positive infinity.
If the first character of the range is the at sign (@), the meaning
of the range will be inverted. I. e. all values within the range will
yield a warning or critical status, while all values outside the range
will result in a success status.
min (and the colon) may be omitted,
min is then assumed to be zero. If max (but not the trailing colon) is
omitted, max is assumed to be positive infinity.
If this option is given, "Not a Number" (NaN) is treated as critical. By
default, the none consolidation reports NaNs as warning. Other
consolidations simply ignore NaN values.
As usual for Nagios plugins, this program writes a short, one line status
message to STDOUT and signals success or failure with it's return value. It
exits with a return value of 0 for success, 1 for warning and 2
for critical. If the values are not available or some other error occurred,
it returns 3 for unknown.
Florian Forster <octo at verplant.org>