Email Alerts Configuration on Nagios Server

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Email Alerts Configuration on Nagios Server

Part 1: Manual email send:

All the below changes will be done in Nagios server, not on the client machine:

Step 1: Edit below code in contact file : vi /usr/local/nagios/etc/objects/contacts.cfg

define contact 

    {

            contact_name                                         nagiosadmin             ; Short name of user

            alias                                                        Nagios Admin            ; Full name of user

            email                                                       example@xyz.com 

            service_notification_commands             notify-service-by-email

            host_notification_commands                  notify-host-by-email

            service_notification_options                   w,u,c,r,f,s

            host_notification_options                        d,u,r,f,s

            service_notification_period                     24x7

            host_notification_period                          24x7

    }

Step 2: mailx Configuration 

            Install mailx: yum install mailx -y

            Configure SMTP: vim /etc/mail.rc

Put below lines in mail rc file:

            set smtp=smtps://smtp.gmail.com:465

            set smtp-auth=login

            set smtp-auth-user=example@xyz.com

            set smtp-auth-password=secret_token_of_your_mail_server

            set ssl-verify=ignore

            set nss-config-dir=/etc/pki/nssdb/

Test the mail is sending or not :

            echo "hi, folks" | mail -v -s "hello" example@xyz.com

 Step 3: change the below code in the commands.cfg file

            vi /usr/local/nagios/etc/objects/commands.cfg

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" | /usr/bin/mailx -s "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **" $CONTACTEMAIL$

    }

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$SERVICEOUTPUT$\n" | /usr/bin/mailx -s "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" $CONTACTEMAIL$

    }

compare if any error is there :

        /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

        systemctl restart nagios

Sample Email Alert

Part 2: Automatic email alerting:

Step 1: Install the below-mentioned dependencies on nagios server machine

            yum install mailx -y

            yum install sendmail -y

            yum install sendmail* -y

Step 2: Edit vi /etc/hosts and mention below the code

            127.0.1.1 localhost.localdomain localhost

Step 3:  Edit vi /usr/local/nagios/etc/objects/contacts.cfg and mention below mentioned code

define contact

     {

            contact_name                                                 nagiosadmin            

            use                                                                  generic-contact        

            alias                                                                Nagios Admin         

            email                                                               youremail@gmail.com 

            service_notification_period                             24x7

            service_notification_options                           w,u,c,r,f,s

            service_notification_commands                     notify-service-by-email

            host_notification_period                                 24x7

            host_notification_options                               d,u,r,f,s

            host_notification_commands                         notify-host-by-email

    }

Step 4:  vi commands.cfg

            locate "notify-service-by-email" & "notify-host-by-email"

replace existing portion in command by /usr/bin/mailx  (as mentioned above section)

but make sure mailx available in /usr/bin/ otherwise move/install mailx on this location or change location in command.cfg

Step 5: Edit vi /usr/local/nagios/etc/objects/client.cfg and mention below code in host section and service section respectivally.

In each host add the following line as explained in the video

            notifications_enabled                1

            notification_period                     24x7

            notification_options                   d,u,r,f,s

            notification_interval                   120

            contact_groups                         admins

            contacts                                    nagiosadmin

In each service add the following line as explained in the video

            notifications_enabled               1

            notification_period                    24x7

            notification_options                  w,u,c,r,f,s

            notification_interval                  60

At last restart the Nagios service by the following command:

            service nagios restart

Nagios Email Alert Configuration

  


Thanks & Regards,

Kanchan Soni (https://linktr.ee/kanchansoni)

(A girl who saw the dream with an open eye to compete with self capability in the area of IT and its Next-Gen Technology, with the ability to complete the task with perfection.)

Email: kanchansoni.cse@gmail.com


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