Nagios | Gmail | SMTP Notification

First create a gmail account to be used by your Nagios server for email notification using its smtp service.

Use this Nagios plugin. Please read the installation instruction.

The send_gmail.py contains the variable that will be configured to match your system. The file installation_notes.txt contains the instructions on how to use this nagios plugin.

The following steps are the actions that were taken to enable the service. In this example I will be using CentOS. Please substitute the correct values for your operating system.

Modify send_gmail nagios plugin

Extract nagios send_gmail plugin to plugin directory then modify the file.

[root@omserver5 ~]# cd /usr/lib/nagios/plugins/

[root@omserver5 plugins]# vi send_gmail.py

server = smtplib.SMTP('smtp.gmail.com', 587)
server.set_debuglevel(1) #0 for quiet or 1 for verbosity
server.ehlo('nagios-monitoring@gmail.com')
server.starttls()
server.ehlo('nagios-monitoring@gmail.com')  # say hello again
server.login('nagios-monitoring@gmail.com', 'nagios-monitoring-password')

server.sendmail('nagios-monitoring@gmail.com', Addresses, "Subject: " + subject + '\nTo:' + address + '\n\n' + body)

Please modify the parameters that suite your needs.

in command.cfg first follow what is written in the instruction but if things dont work then this is what I did. I commented the original lines and add the lines from di instruction with a slight modification.

# OLD
# 'notify-host-by-email' command definition
#define command{
#       command_name    notify-host-by-email
#       command_line    /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type:  NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress:  HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | /bin/mail -s "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **" $CONTACTEMAIL$
#       }

# OLD
# 'notify-service-by-email' command definition
#define command{
#       command_name    notify-service-by-email
#       command_line    /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type:  NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTALIAS$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$" | /bin/mail -s "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" $CONTACTEMAIL$
#       }

#notify host via gmail using python script. \\nnn will insert return, use for body of mssg
define command{
command_name    notify-host-by-email
command_line    /usr/bin/python /usr/lib/nagios/plugins/send_gmail.py -a CONTACTEMAIL$ -b "***** S.O.G.C. Service Monitoring *****\\nnn\\nnnNotification Type: $NOTIFICATIONTYPE$\\nnnHost: $HOSTNAME$\\nnnState: $HOSTSTATE$\\nnnAddress: $HOSTADDRESS$\\nnnInfo: $HOSTOUTPUT$\\nnnDate/Time: $LONGDATETIME$" -s "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **"
}

#notify service via gmail using python script. \\nnn will insert return, use for body of mssg
define command{
command_name    notify-service-by-email
command_line    /usr/bin/python /usr/lib/nagios/plugins/send_gmail.py -a  CONTACTEMAIL$ -b "***** S.O.G.C. Service Monitoring *****\\nnn\\nnnNotification Type: $NOTIFICATIONTYPE$\\nnnService: $SERVICEDESC$\\nnnHost: $HOSTALIAS$\\nnnAddress: $HOSTADDRESS$\\nnnState: $SERVICESTATE$\\nnnDate/Time: $LONGDATETIME$\\nnnAdditional Info: $SERVICEOUTPUT$" -s "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **"
}

Then test the plugin. If there are errors regarding python then supply the correct path in send_gmail.py and all will be fine.

That's it