Nagios Support Forum

hi,

I tried to check apache on solaries server, but always the result as the following:
[root@nms ~]# /usr/local/nagios/libexec/check_nrpe -H 10.103.200.63 -t 120 -c check_init_service -a 'httpd'
NRPE: Unable to read output

thanks,

How do you have "check_init_service" defined on the solaris server's nrpe.cfg? Can you verify there is actually a service called httpd running?

this service (check_init_service) not defined in NRPE.cfg file . also there is service named httpd on this server

You cannot run a check command through NRPE if it is not defined... Please read over the following document, it will show you how to add new commands in the NRPE.cfg file, for additional plugins:

http://nagios.sourceforge.net/docs/nrpe/NRPE.pdf

I can't find the plugin of check_init_service

If you cannot find it on that server, then it does not exist, so you cannot call it... You will need to find a suitable plugin, either in the nagios plugins package, or via the exchange, then set it up with a new command in the nrpe.cfg file, and restart xinetd if that is what you use to initiate NRPE (default if you ran the xi agent installer).

sorry for late:

I check about process java in remote host , but always the error as following, also I define check_procs command in nrpe.cfg as attached:-
COMMAND: /usr/local/nagios/libexec/check_nrpe -H 10.103.200.63 -t 120 -c \'check_procs "-c 1:40 -w 1:20" -a "java"\'
OUTPUT: CHECK_NRPE: Received 0 bytes from daemon. Check the remote server logs for error messages.

other nrpe service, it is Ok :

COMMAND: /usr/local/nagios/libexec/check_nrpe -H 10.103.200.63 -t 120 -c check_cpu_stats -a '-w 80,40,30 -c 95,60,40'
OUTPUT: CPU STATISTICS OK : user=1% system=0%, iowait=0%, idle=99%, nice=0.00%, steal=0.00% | CpuUser=1%;80;95;0; CpuSystem=0%;40;60;0; CpuIowait=0%;30;40;0; CpuIdle=99%;0;0;0; CpuNice=0.0%;0;0;0; CpuSteal=0.0%;0;0;0;

You have a couple of things that need fixing.

We'll be ignoring the java bit to start off with, it just makes it easier to explain.

In nrpe.cfg you have this defined: Which means the command needs to be: Notice how the command does NOT include the -w -c and -s argument flags. NRPE only needs the values for the arguments.

Which outputs something like: Now if you DON'T have a secret and you try and run this command: You will get this output: Which is basically telling us one of the arguments was not correct (the value for -s was not supplied).

I assume you are not using a secret with NRPE. Also, to check a process the nrpe.cfg needs to know what argument will contain the process name. So this means your nrpe.cfg file needs the following line:
Notice how we changed -s to -a

Edit nrpe, make the changes, save the file and restart the service
Now the command you will execute from your Nagios host will be:
Which will output something like: This should sort your problem out, let us know how you go.

it is working

Great! Thanks a ton, Box. Closing this one up.