In this recipe, we'll learn how to specify an alternative method for a contact to receive notifications about a service. A very typical method for a contact to receive notifications is by being sent an e-mail to their contact address; e-mail messages could be sent to an inbox or a paging device.
However, notifications are just text; we can arrange to deal with them via any command we wish, in much the same way we can configure host or service checks. In this recipe, we'll set up a new contact called
motd, which, when it receives notifications, will write them into the server's
/etc/motd to be displayed on login.
You should have a Nagios Core 4.0 or newer server, with at least one host or service configured already. You should understand how notifications are generated and their default behavior in being sent to the
contact_groups for hosts or services.
We'll use the example of a host called
troy.example.net, configured to send...