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Nagios Alert Emailer

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Files:
FileDescription
send_mail.plNagios Alert Emailer
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A direct replacement for the basic nagios email command. This perl script will take standard Nagios commandline parameters and send an email to a configured email server, recipient and address.
This script is a direct replacement for the basic Nagios emailer.

This perl script provides the following features:
* Allows you to specify the senders email address
* Allows you to specify the destination email address/group
* Allows you to differentiate between Host and Service outages
* Allows you to connect directly to any SMTP server
* Doesn't require any local sendmail configuration
* Uses standard Net::SMTP module
* Runs within Nagios's embedded perl interpreter
* Allows you to format the alert message subject and body
* Allows you to send emails to different alert groups based on nagios configuration
Configuration steps --------------


I put this in the nagios plugins directory /usr/local/nagios/libexec but you can put it anywhere.

commands.cfg
---
define command{

command_name notify-by-email
command_line $USER1$/send_mail.pl -n "$NOTIFICATIONTYPE$" -h "$HOSTNAME$" -s "$HOSTSTATE$" -a "$HOSTADDRESS$" -i "$HOSTOUTPUT$" -d "$LONGDATETIME$" -e "$CONTACTEMAIL$"

}
define command{

command_name host-notify-by-email
command_line $USER1$/send_mail.pl -n "HOST $NOTIFICATIONTYPE$" -h "$HOSTNAME$" -s "$HOSTSTATE$" -a "$HOSTADDRESS$" -i "$HOSTOUTPUT$" -d "$LONGDATETIME$" -e "$CONTACTEMAIL$"

}
define command{

command_name service-notify-by-email
command_line $USER1$/send_mail.pl -n "SERVICE $NOTIFICATIONTYPE$" -h "$HOSTNAME$" -s "$SERVICESTATE$" -a "$HOSTADDRESS$" -i "$SERVICEDESC$ - $SERVICEOUTPUT$ - $SERVICECHECKCOMMAND$" -d "$LONGDATETIME$" -e "$CONTACTEMAIL$"

}

contacts.cfg
---
define contact{

contact_name contact
host_notification_commands host-notify-by-email
service_notification_commands service-notify-by-email
email email@address.com
.... rest of contact details ....

}
Reviews (2)
In my systems which run Debian Wheezy I needed to remove the
at the end of the datasend lines i.e.

$smtp->datasend("To: $mailto");
$smtp->datasend("From: $mailfrom");
$smtp->datasend("Subject: $mailsubject");
$smtp->datasend("
");

so that the headers acually are taken as headers.

I also set the subject as:
# $mailsubject = "Nagios Monitoring Alert: $opt_h is $opt_s";
$mailsubject = "$opt_n: $opt_h $opt_D is $opt_s";

which maximises the information in a view of mail messages with just headers, to prioritise dealing with alerts
bydimsum, October 16, 2011