NRPE unrecognized output when monitoring Ubuntu server

[cwscribner]

Hi all.

I get NRPE: Unable to read output for the following services: Cron, ssh, and syslog daemon. I also get 'UNKNOWN: iostat not found or is not executable by the nagios user' for CPU Stats monitoring. Any thoughts on how to fix these?

System being monitored
OS: Ubuntu 10.04
Agent: nagios-agent installed via repos

[agriffin]

iostat is in the sysstat package on Red Hat and CentOS systems. Try running the following command to (re)install it:

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yum install sysstat

Regarding the NRPE error, can you post your command definitions both on the Nagios side and the NRPE client side?

[cwscribner]

I added some background info to the original post.

I've tried using apt-get to install iostat but it seems like there isn't such a package available for Ubuntu. Is it a sub-part of another package or do I need to use a completely different utility?

Nagios server side:
CPU: $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$ (ARG1=check_cpu_stats ARG2=-a '-w 85 -c 95')
Cron: "..." (ARG1=check_init_service ARG2=-a 'crond')
Syslog: "..." (ARG1=check_init_service ARG2=-a 'syslog')

I'm not sure where to find the definitions on the host side since the agent was installed via repo.

[scottwilkerson]

I've tried using apt-get to install iostat but it seems like there isn't such a package available for Ubuntu. Is it a sub-part of another package or do I need to use a completely different utility?

iostat should be part of the sysstat package

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sudo apt-get install sysstat

[cwscribner]

That did the trick for the CPU monitoring.

Now I just have to get NRPE working...

[scottwilkerson]

That did the trick for the CPU monitoring.

Now I just have to get NRPE working...

Lets look in

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/etc/nagios/nrpe.cfg

[cwscribner]

Here's the nrpe.cfg file on the monitored server.

[scottwilkerson]

In this file you will need to set dont_blame_nrpe=1 because you are passing args from your Nagios server.

but this also assumes that nrpe was compiled with

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./configure --enable-command-args

and I'm not sure at this moment what the RPM does.

Additionally, the folders /etc/nagios/nrpe.d/ is included and their is likely a commands.cfg file in their

Also in this configuration is
include=/etc/nagios/nrpe_local.cfg

so their may be overriding configurations in that file...

[cwscribner]

So nrpe_local.cfg contained nothing. I found one file in nrpe.d that had configuration directives in it. I've attached it.

[scottwilkerson]

on my ubuntu test machine my cron is named cron instead of crond, ssh is ssh instead of sshd
you should be able to check yours with

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service --status-all

To make these changes, in XI change the $ARGS1$ from -a 'crond' to -a 'cron'

This was one of the reasons why we had disabled the ubuntu & debian in the wizard.

I'll try to get these sorted for the next release of the wizard.