Plugin time outs and DNS

Nagios Nagios Plugins support
1

Hi!, I was wondering if anyone using Nagios has experienced instances of NRPE timeouts when DNS goes down. We had a incident where one of our web servers starting shooting out tons of:

“CRITICAL - Plugin timed out while executing system call”

when one DNS server became unreachable. However, in our /etc/resolv.conf we have a secondary if the first goes down so I don’t know if NRPE has any logic to use secondary name server when primary name server goes down?

Ex:

/etc/resolv.conf

192.168.1.1
192.168.1.2

Is NRPE smart enough to know if 192.168.1.1 goes down use 192.168.1.2?

We are using NRPE Version: 2.8.1 on the server in question.

Thanks

2

Use IP adresses

3

Albin,

Can you be more specific? What do you mean use IP?

Thanks

4

I meant that you use IP addresses in address variable of host definition…

5

Hello…
I am monitoring 10 processes on remote server through check_by_ssh in nagios. 8 services works fine.
but in check_ping and check_ssh through ssh I am getting error "CRITICAL - Plugin timed out while executing system call"
These both works fine in command line… Only in nagios these have problem !!!

I tried by modifying “command_check_interval” = 180s (was -1) in nagios.cfg file…but didn’t work.
I tried by calling commands (check_ping and check_ssh through check_by_ssh) with option “-t 20” it didn’t work

how to resolve this? Does anyone have any idea?
please help …

6

Perhaps you can post what you have in your check_commands.cfg, and services.cfg for the check_by_ssh checks? If you are running check_ssh by hand and it works it sounds like there might be an error within the definition.

7

Is it possible to use dynamics dns for my server? I wish to apply a domain name. How do I fill up the field of Primary Nameserver and Secondary Nameserver? I plan to get a domain name, and use my server which is has no statis IP but plan to use a dynamics DNS. How should I set this up?