How to configure email notification from nagios.

[giles]

Hi,

I was trying to configure email notification form nagios.

I was following the folllowing doc:

https://www.unixmen.com/send-alerts-nag ... ail-yahoo/

But when I run following command the result is as below

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root@opm:~# apt-get install 'perl(Net::SSLeay)' 'perl(IO::Socket::SSL)'
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package perl(Net:
E: Unable to locate package perl(IO::Socket:

Do you have any official doc to configure email notification for nagios core? I am using Ubuntu 14.04. I had installed nagios by following this doc. https://support.nagios.com/kb/article.php?id=97

Regards,
Giles.

[rkennedy]

For Core, we do not. The RHEL documentation does a pretty good job at explaining this -
https://access.redhat.com/documentation ... tions.html

Pretty much, make sure notifications are enabled on a host / service, assign a contact, and then whatever command is assigned to that contact will be triggered upon a notification. The default contact 'nagiosadmin' is a good example, which will use the notify-host-by-email and notify-service-by-email commands by default. This however, would utilize sendmail and not an external SMTP server such as gmail or yahoo.

[giles]

Hi, I have configured email. But there are some error in nagios log as following:

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[09-07-2016 12:11:00] wproc: stderr line 02: /usr/bin/printf: write error: Broken pipe
Informational Message[09-07-2016 12:11:00] wproc: stderr line 01: /bin/sh: 1: /usr/bin/sendmail: not found

How can I sure that nagios is sending mail?

[rkennedy]

Take a look at the output of which mail, which will tell you the path for the mail on your system.

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[root@localhost var]#  which mail
/bin/mail

Now, look at how your notify-host-by-email, and notify-service-by-email, and adjust the path as needed, for example on my machine you can see /bin/mail is specified. -

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[root@localhost var]# cat /usr/local/nagios/etc/commands.cfg | grep 'notify-' -A 3
       command_name                             notify-host-by-email
       command_line                             /usr/bin/printf "%b" "***** Nagios Monitor XI Alert *****\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 $HOSTSTATE$ **" $CONTACTEMAIL$
}

--
       command_name                             notify-service-by-email
       command_line                             /usr/bin/printf "%b" "***** Nagios Monitor XI Alert *****\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 $SERVICESTATE$ **" $CONTACTEMAIL$
}

[giles]

There is no error message on nagios log after using the appropriate path. Now, I want to forward the mails to gmail. What should be the configuration?

[avandemore]

You can change a contact's email by editing /usr/local/nagios/etc/objects/contacts.cfg. Does this resolve your problem?

[tgriep]

If you are using the /bin/mail command, you will have to either install the postfix or sendmail daemon on your server and then use that to forward emails from the nagios server to gmail.
Can you post back if the server has sendmail or postfix installed on it?

[giles]

I have installed postfix and configured nagios by following the following link.

http://www.telnetport25.com/2012/02/con ... gios-core/

But it is not working.

[tgriep]

Try using this procedure to configure Postfix to relay emails to an outside SMTP server.
https://www.freelock.com/kb/postfix-relayhost

If you do this, the Nagios server will use the default Notification commands so you will have to edit the commands file and put back the

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notify-host-by-email
notify-service-by-email

commands to the default settings and that should work for you.

[giles]

Hi,

Email notification is working!!!

Actually it started working yesterday just after installing and configuring the postfix, but as the email was going to spam I didn't notice it. So, configuring sasl_passwd and main.cf is not required.

Now, my domain name is rtailephant.com. So, all the notification is coming from nagios@rtailephant.com. If want change the email address such as mailuser@rtailephant.com intsead of nagios@rtailephant.com where should I change?

Regards,
Giles.