the boopable LibreNMS JSON style SNMP extend for remotely running nagios style checks
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sneck -u [-C <cache file>] [-f <config file>] [-p] [-i]

sneck -c [-C <cache file>] [-b]

sneck [-f <config file>] [-p] [-i]


-f <config>              Config file to use.
                         Default: /usr/local/etc/sneck.conf

-c                       Print the cache and exit. Requires -u being used previously.

-C                       Cache file.
                         Default: /var/cache/sneck.cache

-b                       base64+gzip the printing of the cache.

-u                       Run and write to cache.

-p                       Pretty print. Does not affect -c.

-i                       Include the raw config in the JSON.

-h                       Print help info.
--help                   Print help info.
-v                       Print version info.
--version                Print version info.


White space is always cleared from the start of lines via /^[\t ]*/ for each file line that is read in.

Blank lines are ignored.

Lines starting with /#/ are comments lines.

Lines matching /^[A-Za-z0-9_]+=/ are variables. Anything before the the /=/ is used as the name with everything after being the value.

Lines matching /^[A-Za-z0-9_]+|/ are checks to run. Anything before the /|/ is the name with everything after command to run.

Any other sort of lines are considered an error.

Variables in the checks are in the form of %%%varaible_name%%%.

Variable names and check names may not be redefined once defined in the config.


# this is a comment
geom_foo|/usr/bin/env PATH=%%%PATH%%% /usr/local/libexec/nagios/check_geom mirror foo
does_not_exist|/bin/this_will_error yup... that it will
does_not_exist_2|/usr/bin/env /bin/this_will_also_error

The first line creates a variable named path.

The second is ignored as it is a comment.

The third creates a check named geom_foo that calls env with and sets the PATH to the the variable defined on line 1 and then calls check_geom_mirror.

The fourth is a example of an error that will show what will happen when you call to a file that does not exist.

The fifth line will be ignored as it is blank.

The sixth is a example of another command erroring.

When you run it, you will notice that errors for lines 4 and 5 are printed to STDERR. For this reason you should use '2> /dev/null' when calling it from snmpd or '2> /dev/null > /dev/null' when calling from cron.


snmpd should be configured as below.

extend sneck /usr/bin/env PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin /usr/local/bin/sneck -c

Then just setup a entry in like cron such as below.

*/5 * * * * /usr/bin/env PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin  /usr/local/bin/sneck -u 2> /dev/null > /dev/null

Most likely want to run it once per polling interval.

You can use it in a non-cached manner with out cron, but this will result in a longer polling time for LibreNMS or the like when it queries it.


The generated JSON/hash is as below in jpath notation.

  • .data.alert :: 0/1 boolean for if there is a aloert or not.

  • .data.ok :: Count of the number of ok checks.

  • .data.warning :: Count of the number of warning checks.

  • .data.critical :: Count of the number of critical checks.

  • .data.unknown :: Count of the number of unkown checks.

  • .data.errored :: Count of the number of errored checks.

  • .data.alertString :: The cumulative outputs of anything that returned a warning, critical, or unknown.

  • .data.vars :: A hash with the variables to use.

  • .data.time :: Time since epoch.

  • .data.time :: The hostname the check was ran on.

  • .data.config :: The raw config file if told to include it.

For the following $name is the name of the check ran.

  • .data.checks.$name :: A hash with info on the checks ran.

  • .data.checks.$name.check :: The command pre-variable substitution.

  • .data.checks.$name.ran :: The command ran.

  • .data.checks.$name.output :: The output of the check.

  • .data.checks.$name.exit :: The exit code.

  • .data.checks.$name.error :: Only present it died on a signal or could not be executed. Provides a brief description.



pkg install p5-JSON p5-File-Slurp p5-MIME-Base64 p5-Gzip-Faster p5-App-cpanminus
cpanminus Monitoring::Sneck


apt-get install zlib1g-dev cpanminus
cpanminus Monitoring::Sneck

From Src

perl Makefile.PL
make test
make install