Nagios + SMS using a mobile phone

A few posts previously had topics about using SMS notifications in Nagios. Today I’ll talk about another notification method. The method described below is somewhat more reliable than previously described, but also requires some cash investment. It is useful when some of the notifications are critical (such as a failure of the air conditioner or an increase in humidity).

The way is to use a mobile phone with a corporate tariff (so that the money on the phone does not end unexpectedly).

Physically connects to the server via bluetooth, com or usb. At the software level, we will use two scripts: one of them can send sms, the second checks the status of the mobile network. If the mobile network is unavailable, then nagios sends an email.

Both scripts are written in python and use the gammu library to connect to the phone.

First script: check_sendsms.py - check network status

#!/usr/bin/env python
import gammu
import sys
# Create state machine object
sm = gammu.StateMachine()
# Read /etc/gammurc
sm.ReadConfig()
# Connect to phone
sm.Init()
# Reads network information from phone
netinfo = sm.GetNetworkInfo()
# Print information
print 'State: %s' % netinfo['State']
if netinfo['State'] != "HomeNetwork":
        sys.exit(2)

Second script: sendsms.py - actually sending sms

#!/usr/bin/env python
import gammu
import sys
if len(sys.argv) != 3:
    print 'Usage: sendsms.py number1[,number2][...] "message"'
    sys.exit(1)
# we are going to send first 160 characters only
text_message=sys.argv[2][:160]
# connect to phone
sm = gammu.StateMachine()
# Read /etc/gammurc                                                                                                           
sm.ReadConfig()
sm.Init()
# send messages
for phone_number in sys.argv[1].split(','):
    sms_message = {'Text': text_message, 'SMSC': {'Location': 1}, 'Number': phone_number}
    try:
        sm.SendSMS(sms_message)
    except:
        print "Sorry, I can't send message to %s" % phone_number

Some comments

• The script sendsms.py as the first parameter takes phone numbers in the form + 7xxxxxxxxxx, separated by commas, and as the second message text. In addition, the SMS message is truncated to 160 characters, so as not to complicate the system using Multi Part SMS.
  
  
• Sample nagios sms notification commands
  

  # 'notify-service-by-sms' command definition
  define command {
          command_name notify-service-by-sms
          command_line /etc/_orga/nagios/nagios-sms/sendsms.py $ CONTACTPAGER $ "Nagios - $ NOTIFICATIONTYPE $: $ HOSTALIAS $ / $ SER
  VICEDESC $ is $ SERVICESTATE $ ($ SERVICEOUTPUT $) "
          }
  # 'notify-host-by-sms' command definition
  define command {
          command_name notify-host-by-sms
          command_line /etc/_orga/nagios/nagios-sms/sendsms.py $ CONTACTPAGER $ "Nagios - $ NOTIFICATIONTYPE $: Host $ HOSTALIAS $
   is $ HOSTSTATE $ ($ HOSTOUTPUT $) "
          }

  
  
• Network Status Verification Command Example
  

  # 'check_sendsms' command definition
  define command {
          command_name check_sendsms
          command_line $ USER1 $ / check_sendsms.py
  }

  
  

• / etc / gammurc for bluetooth will look like this
  [gammu]
  port = / dev / rfcomm0
  connection = at19200