python-nagios-helpers A.K.A naghelp is a collections of classes for building nagios Active plugins. It is higly recommended to use python-textops to manipulate collected data.

Here is an exemple of an active python plugin, create a file linux_fsfull.py:

from naghelp import *
from textops import *

class LinuxFsFull(ActivePlugin):
    """ Basic plugin to monitor full filesystems on Linux systems"""
    cmd_params = 'user,passwd'
    tcp_ports = '22'

    def collect_data(self,data):
        data.df = Ssh(self.host.ip,self.host.user,self.host.passwd).run('df -h')

    def parse_data(self,data):
        df = data.df.skip(1)
        data.fs_critical = df.greaterequal(98,key=cuts(r'(\d+)%')).cut(col='5,4').renderitems()
        data.fs_warning = df.inrange(95,98,key=cuts(r'(\d+)%')).cut(col='5,4').renderitems()
        data.fs_ok = df.lessthan(95,key=cuts(r'(\d+)%')).cut(col='5,4').renderitems()

    def build_response(self,data):
        self.response.add_list(CRITICAL,data.fs_critical)
        self.response.add_list(WARNING,data.fs_warning)
        self.response.add_list(OK,data.fs_ok)

if __name__ == '__main__':
   LinuxFsFull().run()

To excute manually:

python linux_fsfull.py --ip=127.0.0.1 --user=naghelp --passwd=lgpl

On error, it may return something liek this:

STATUS : CRITICAL:2, WARNING:1, OK:3
==================================[  STATUS  ]==================================

----( CRITICAL )----------------------------------------------------------------
/ : 98%
/home : 99%

----( WARNING )-----------------------------------------------------------------
/run/shm : 95%

----( OK )----------------------------------------------------------------------
/dev : 1%
/run : 1%
/run/lock : 0%


============================[ Plugin Informations ]=============================
Plugin name : __main__.LinuxFsFull
Description : Basic plugin to monitor full filesystems on Linux systems
Ports used : tcp = 22, udp = none
Execution time : 0:00:00.673851
Exit code : 2 (CRITICAL), __sublevel__=0

Or if no error:

OK

============================[ Plugin Informations ]=============================
Plugin name : __main__.LinuxFsFull
Description : Basic plugin to monitor full filesystems on Linux systems
Ports used : tcp = 22, udp = none
Execution time : 0:00:00.845603
Exit code : 0 (OK), __sublevel__=0

Naghelp will automatically manage some options:

$ python linux_fsfull.py -h
Usage:
linux_fsfull.py [options]

Options:
  -h, --help         show this help message and exit
  -v                 Verbose : display informational messages
  -d                 Debug : display debug messages
  -l FILE            Redirect logs into a file
  -i                 Display plugin description
  -n                 Must be used when the plugin is started by nagios
  -s                 Save collected data in a temporary file
  -r                 Use saved collected data (option -s)
  -a                 Collect data only and print them
  -b                 Collect and parse data only and print them

  Host attributes:
    To be used to force host attributes values

    --passwd=PASSWD  Passwd
    --ip=IP          Host IP address
    --user=USER      User
    --name=NAME      Hostname

For more information, Read The Fabulous Manual !