Nagios Support Forum

We are getting the attached error.

We have verified from Nagios server, the nslookup resolves to correct IP.

# nslookup usmabugfix1
Server: 10.101.20.101
Address: 10.101.20.101#53

Name: usmabugfix1.bose.com
Address: 10.101.20.145

# ./check_dns -H usmabugfix1.bose.com -a 10.101.20.145
DNS OK: 0.046 seconds response time. usmabugfix1.bose.com returns 10.101.20.145|time=0.045970s;;;0.000000

But still i can see the attached error from Nagios.

Let me know if you need any other information.

Adding the screenshot

Adding one more screenshot which shows the service settings

This is because your $HOSTADDRESS$ variable is set to 10.101.29.145 (on the host definition), you'll want to adjust that accordingly. It's doing a PTR lookup rather then a DNS A record for the host.

Shall i edit the $arg1 to -A instead of -a ?

Kindly assist on the correction which needs to be made.

Your $HOSTADDRESS$ would have to be set to the DNS name, and not 10.101.29.145.

The alternative, is to create a custom command based on check_dns, which doesn't use the $HOSTADDRESS$ variable, but perhaps just $ARG1$ AND $ARG2$. For that you could do -

check_dns_custom - Then, your $ARG1$ would be usmabugfix1.bose.com and $ARG2$ would be 10.101.20.145

Does that make sense?

how do i change the $HOSTADDRESS$ to DNS name ?

You'll need to create a new command in the Core Config Manager, and then assign it to that service.

Can you please explain me why i get a "DNS OK" when i run the same command from cli

# ./check_dns -H usmabugfix1.bose.com -a 10.101.20.145
DNS OK: 0.046 seconds response time. usmabugfix1.bose.com returns 10.101.20.145|time=0.045970s;;;0.000000

Or are the parameters different ?

This is because your $HOSTADDRESS$ variable is set to 10.101.29.145 (on the host definition), you'll want to adjust that accordingly.

In the screenshot I've attached, $HOSTADDRESS$ will be 127.0.0.1. Take a look at the host for the service you're checking.