Index of /Monitoring

 Name                    Last modified      Size  
 Parent Directory                             -   
 read_d3p_temperature..> 2012-12-03 21:21  1.7K  
 ReadMe.txt              2014-06-22 23:18  4.1K  
 sqlite3stats.pl.txt     2012-10-01 22:35  5.9K  
 read_d3p_temperature..> 2012-12-03 22:36  7.4K  
 cambridge-dtg.pl.txt    2011-09-19 18:41   11K  
 plc_.102.txt            2013-08-25 00:47   12K  
 plc_.103.txt            2014-02-01 20:42   17K  
 diskstatjf_             2014-02-09 13:59   20K  
 diskstatjf_.txt         2014-02-09 13:59   20K  
 smartstats_.txt         2014-06-22 23:18   22K  
 plc_.txt                2014-02-01 20:42   23K  

Monitoring
==========

I have various things monitored at home about the server I run. As I was
very concerned about the temperature of the server during the summer a
year or so back I began monitoring temperatures as well - I've used Day 
Barr's plugins for monitoring now that the Dell desktop I use as my 
server doesn't have any internal monitoring.

Anyhow, if there are any interesting plugins that I create, I'll put 
them here. Eventually there should be a few that I've written which get
moved here in case they're useful to anyone else.

cambridge-dtg:
  The Cambridge Digital Technology Group have some weather sensors
  on the top of their labs. As they're accurate for Cambridge, where
  I live at present, I use them as monitors for the general environment.
  They give a reasonable indication of the temperatures at the time.
  This can then be used alongside the server-specific temperature to
  get some useful information.
  The plugin can function either in text mode (where it really just
  re-prints the textual information from their site), as an MRTG plugin,
  or as a munin plugin.

sqlite3stats.pl
  It is often useful to track the usage of databases. MySQL and 
  PostgreSQL have plugins to monitor many parts of their usage, but
  I could not find any similar plugin for SQLite databases. I wrote a
  simple plugin that will produce some statistics about the database.
  At present we just report the size of the file, and the highest
  row id for each table, which approximates the number of rows.  

read_d3p_temperature.sh
  A friend of a colleague built a custom temperature sensing device.
  It's a USB interface, with 8 temperature sensors, on the end of
  2 meters of cable each. It's very simple to communicate with, so I
  wrote a simple shell script to do so.

read_d3p_temperature.pl
  Having written the simple script to just read the values, I wrote a
  more complex script that allows the reading of temperatures as human
  readable format, for MRTG or for Munin, and can be configured to run
  with different parameters in each case. Probably overkill, but it
  appears to work.

plc_
  A munin plugin which can monitor the Powerline network speed and 
  signal to noise ratio. I use this with my TP-Link powerline network 
  devices. Revised (v1.04) to understand both AR6400 and INT7400
  devices. Thanks to Alex Macfarlane-Smith for testing.

plc_102
  Older Munin plugin, which did not correctly understand the way in 
  which the network topology was described, but which is a little 
  simpler (and should work correctly if you don't reset the devices on 
  the network).

plc_103
  Older Munin plugin, which only handled more recent Atheros devices
  (those which used the 'amp*' tools).

diskstatjf_
  A modification of the standard diskstat_ data collection plugin
  to key the drives by their model and serial number, instead of by
  the device name. In a system that has multiple controllers, and
  swappable discs, the device names - which are dynamically assigned
  for the 'sd' devices - can end up in a different order to that
  which they were originally. This means that the historic data
  for each device is not related to the device name - and as discs
  are moved around, or the controllers appear in a different order
  on startup, the historic records for each device would be
  incorrectly assigned. Using the model and serial number should
  keep the historic records accurate. I also added a title to each
  drive which gives the labels that were assigned to the filesystems
  on the drive. Some drives may not have labels (and in any case
  they are assigned to the FS, not the drive) so the label is not
  used as a distnguisher.

smartstats_
  A munin plugin designed to report on the 'sataphy' statistics reported 
  by the logs in modern discs. Requires 'smartctl'. Uses the same logic
  to select drives as the the above 'diskstatjf_' tool. I use the tool
  configured with 'ACTIVEONLY' set to '1', and 'CACHE' of '120', so that
  we only wake up discs that would be awake anyhow.
  Updated 2014-05-13 to add support for reading SSD usage information.
  Updated 2014-06-22 to use udevadm in preference to udevinfo.

-- 
Justin Fletcher