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A recent version of perl5.

CPAN Modules: 
Nagios::Plugin - if you're lucky, rpmforge repo is configured in yum and you 
can issue 'yum install perl-Nagios-Plugin' to install everything you need.

(optional) Writable directory for meta data cache from mysql.  Defaults to 
'/tmp/pdb_nagios_cache'.  Can also run in non-caching mode, see below or 
--help for more info. 

To install:

* copy plugin to nagios plugin directory.
* chmod 755.  
* Make sure cache directory is writable by nagios user. 

Usage examples:

To check for long running queries, warn at 40 seconds, critical at 60 seconds: --hostname=localhost --user=root --mode=long-query \
--warning=900 --critical=1800

To checked for locked queries: --hostname=localhost --user=root --mode=locked-query

To check mysql status and variables; for example max connections, alert at > 80% used: --hostname=localhost --user=root --mode=varcomp \
--expression="Max_used_connections/max_connections * 100" --comparison_warning=">80" \

In varcomp, you can use any variable from 'SHOW GLOBAL STATUS' and 

To compare status and variables from previous run's cache file, you can do something like: --hostname=localhost --user=root --mode lastrun-varcomp \
 --comparison_warning ">80" \
 --comparison_critical ">100" \
--expression "(current{Queries} - lastrun{Queries}) / (current{Uptime} - lastrun{Uptime})"

current{keyword} and lastrun{keyword} will be replaced with the appropriate value from the cache.  

WARNING: There isn't good sanity checking here yet, so please get the keywords right or else you'll see warnings.

To check if mySQL is read-only, you can do: --hostname=localhost --user=root --mode simple --expression read_only

To check the default storage engine, you can do: --hostname=localhost --user=root --mode simple --expression engine

General Notes:

--warning and --critical Thresholds are very flexible, please see:
for detailed info on how to use them.  

Use --help to a full list of supported arguments.