derived - run command periodically, calculate rate and check from network
$ cat CmdsFile slowqueries: mysql -NB -e 'show global status like "Slow_queries%"' $ derived -MMemcahced,port=12306 CmdsFile $ telnet localhost 12306 get slowqueris VALUE slowqueris 0 3 0.2 # slow queries/sec
derived runs command periodically and capture integer value. And calculate per-second rate. You can retrieve these values from integrated memcached-protocol server or pluggable workers.
You can monitoring the variation of metrics through this daemon.
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Interval seconds for running commands. Default 10.
Plugin. Requires one or more Plugin load.
loading plugin with port and host arguments.
a file that list commands
A command file should contain both a name for the process and the command used to run it.
slowquery: mysql -NB -e 'show global status like "Slow_queries%"' lines: wc -l /path/to/file
IF there is no previous data to calculate rate, the server returns "0E0"
Masahiro Nagano <firstname.lastname@example.org>
Copyright (C) Masahiro Nagano