A boilerplate nagios check script.

check_anything.py

#!/usr/bin/env python

"""
Boilerplate Nagios check script.
"""

import os, os.path, sys, getopt, datetime
import yaml

nagios_codes = {'OK': 0, 
    			'WARNING': 1, 
				'CRITICAL': 2,
				'UNKNOWN': 3,
				'DEPENDENT': 4}

def main():
	""" example options processing
		here we're expecting 1 option "-h"
		with a parameter
	"""
	try:
		opts, args = getopt.getopt(sys.argv[1:], "h:")
	except getopt.GetoptError, err:
		usage()
	
	host = None
	for o, value in opts:
		if o == "-h":
			host = value
		else:
			usage()

	result = check_condition(host)
	nagios_return(result['code'], result['message'])

def usage():
	""" returns nagios status UNKNOWN with 
		a one line usage description
		usage() calls nagios_return()
	"""
	nagios_return('UNKNOWN', 
			"usage: {0} -h host".format(sys.argv[0]))

def nagios_return(code, response):
	""" prints the response message
		and exits the script with one
		of the defined exit codes
		DOES NOT RETURN 
	"""
	print code + ": " + response
	sys.exit(nagios_codes[code])

def check_condition(host=None):
  return dict(
  	code = "OK" # or "CRITICAL" or "WARNING"
	message = "This host or service is okay."
  )

if(__name__ == '__main__'):
	main()