How to force FQDN for host ping check ?

[nagmoto]

I have host defined as following, and ip was out of sync with DNS server.
And this trigger an host down alert.

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define host{
        use                    windows-server
        host_name         cxa63.test.com
        alias                  cxa63.test.com
        address              10.4.122.83
        }

Question is how can I force Nagios 4.1.1 server to use host_name as 1st priority line to check for IP up/down ?

[mcapra]

If we were to look at a very typical check_ping command definition, like the one used in Nagios XI, $HOSTADDRESS$ is used as part of the command_line parameter:

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define command {
       command_name                  		check_ping
       command_line                  		$USER1$/check_ping -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p 5
}

You could instead $HOSTNAME$ in the command_line parameter, though that is a bit counter intuitive since you could just set the address for the host to the FQDN:

Code: Select all

define command {
       command_name                  		check_ping_host_name
       command_line                  		$USER1$/check_ping -H $HOSTNAME$ -w $ARG1$ -c $ARG2$ -p 5
}

More on Nagios Core macros:
https://assets.nagios.com/downloads/nag ... olist.html

[tgriep]

You can put the FDQN of the host in the address field instead of the IP address. It doesn't have to be an IP address in that field, a host name will work as well.
The Nagios process will do a DNS lookup if there is a host name and the check should work the way you want.

[nagmoto]

Thanks for the help. Please close this post.