nodereality

#!/usr/bin/env python
'''
Munin plugin to monitor I/O transactions of geom(4) devices
on FreeBSD as reported by gstat(8).

To get the list of devices you might want to monitor,
run gstat.
If your device contains '/', substitute it with '_';
example: mirror/myarray -> mirror_myarray

Install it as any other munin plugin (if you want to monitor
device foo, symlink the plugin in your plugins directory
as gstat_foo.py).

The plugin need to be run as root.
Add these 2 lines to your plugins.conf:
[gstat_*]
user root

You need to restart munin_node for the changes to take effect.


Written by ghirai-at-ghirai-d0t-com
'''

import sys
from subprocess import Popen,PIPE
from string import split


device = sys.argv[0][(sys.argv[0].find('_')+1):]
if device == None: sys.exit(1)

device = device.replace('_','/')

if len(sys.argv) == 2 and sys.argv[1] == "autoconf":

  print "yes"

elif len(sys.argv) == 2 and sys.argv[1] == "config":

  print 'graph_title I/O transactions for %s' % device
  print 'graph_vlabel Transfers in kBps'
  print 'graph_category Disk'

  print 'r.label read'
  print 'w.label write'

  print 'graph_args --base 1000 -l 0'

else:

  r = 0
  w = 0

  res = Popen(['gstat','-b'],stdout=PIPE).stdout.read()
  res = res.split('\n')

  for ln in res:

    lns = split(ln)
    lns.reverse()

    try:
      if lns[0] == device:
        r = lns[6]
        w = lns[3]
        break
    except IndexError:
      break

  print 'r.value %s' % r
  print 'w.value %s' % w