NRPE: Unable to read output

[kyle.odonnell at gmail.com]

I dont know if that will work, there is a specific option inside
nrpe.cfg for executing commands via sudo:

# COMMAND PREFIX
# This option allows you to prefix all commands with a user-defined string.
# A space is automatically added between the specified prefix string and the
# command line from the command definition.
#
# *** THIS EXAMPLE MAY POSE A POTENTIAL SECURITY RISK, SO USE WITH CAUTION! ***
# Usage scenario:
# Execute restricted commmands using sudo.  For this to work, you need to add
# the nagios user to your /etc/sudoers.  An example entry for alllowing
# execution of the plugins from might be:
#
# nagios          ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/
#
# This lets the nagios user run all commands in that directory (and only them)
# without asking for a password.  If you do this, make sure you don't give
# random users write access to that directory or its contents!

# command_prefix=/usr/bin/sudo


Also make sure you can run the command exactly like nrpe does as the
user nrpe is running as.

As for your bolded question, go chmod 644 check_load and try to run
it, it will give you the same error.  It just means that the script
executed but didn't respond with recognized output.

On 8/12/08, Jake Solid <richardsolid at gmail.com> wrote:
> I did modified the nrpe.cfg to execute commands via sudo by adding the
> following line:
>
> *command[check_smartmon]=/usr/bin/sudo
> /usr/lib64/nagios/plugins/check_smartmon  ata -d /dev/sda*
>
> *Why I'm able to invoke the following plugins from the nagios server using
> check_nrpe but when invoking check_smartmon  I get *NRPE: Unable to read
> output*?*
>
> command[check_users]=/usr/lib64/nagios/plugins/check_users -w 8 -c 10
> command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c
> 30,25,20
> command[check_disk1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p
> /dev/mapper/VolGroup00-LogVol00
> command[check_disk2]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p
> /dev/mapper/VolGroup00-LogVol01
> command[check_disk3]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p
> /dev/mapper/VolGroup00-LogVol02
> command[check_disk4]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p
> /dev/mapper/VolGroup01-LogVol00
> command[check_md]=/usr/lib64/nagios/plugins/check_swraid
> command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10
> -s Z
> command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 200 -c
> 300
>
>
>
> On Tue, Aug 12, 2008 at 12:25 PM, <kyle.odonnell at gmail.com> wrote:
>
>> executing check_nrpe via sudo will not accomplish what you want.  You
>> will need to either modify the nrpe.cfg to execute commands via sudo,
>> or write a wrapper for check_smartmon.  I am not familiar with that
>> plugin, but you may also be able to edit it and prepend /path/to/sudo
>> before it execs smartctl.
>>
>>
>>
>> On 8/12/08, Jake Solid <richardsolid at gmail.com> wrote:
>> > I'm trying to use check_nrpe with check_smartmon but I'm getting NRPE:
>> > Unable to read output at the Nagios Server. *All other check plugins
>> > like
>> > check_load and check_procs work fine.
>> > *
>> > *I'm running the following command from my nagios server to the remote
>> host:
>> > *
>> > *./check_nrpe -H remotehost.domain.com -c check_smartmon*
>> >
>> > *and the out put is the following:*
>> > *NRPE: Unable to read output*
>> >
>> > *This is what the remote host logs display:*
>> > *Aug 12 11:16:13 *remotehost* xinetd[7151]: START: nrpe pid=7986 from=
>> > 198.162.1.1 <- Nagios Server IP Address
>> > Aug 12 11:16:13 *remotehost* nrpe[7986]: INFO: SSL/TLS initialized. All
>> > network traffic will be encrypted.
>> > Aug 12 11:16:13 *remotehost* xinetd[7151]: EXIT: nrpe status=0 pid=7986
>> > duration=0(sec)*
>> >
>> >
>> > *When I use the check_smartmon directly in the remote machine as the
>> > user
>> > nagios and using sudo it works fine:*
>> > [nagios at remotehost plugins]$  sudo
>> /usr/lib64/nagios/plugins/check_smartmon
>> > ata -d /dev/sda
>> > OK: device is functional and stable (temperature: 33)
>> >
>> > *If I change the only_from line on  /etc/xinetd.d/nrpe file to
>> > 127.0.0.1and
>> > I run the following from the remote host I get prompted by a password:*
>> > *[nagios at remotehost plugins]$ sudo /usr/lib64/nagios/plugins/check_nrpe
>> -h
>> > remotehost.domain.com.latpro.com -c check_smartmon
>> > Password:
>> > *
>> > *The permissions on the device are the following:*
>> > *[nagios at remotehost plugins]$ ls -lah /dev/sda
>> > brw-rw---- 1 root disk 8, 0 Jan  8  2008 /dev/sda*
>> >
>> > *The disk group also has nagios:*
>> > disk:x:6:root,nagios
>> >
>> >
>> > *And again the other plugins work fine when they are invoked from the
>> Nagios
>> > server. Like the following:*
>> > [nagios at nagios-server plugins]$ ./check_nrpe -H remotehost.domain.com -c
>> > check_load
>> > OK - load average: 2.14, 2.44, 2.72|load1=2.140;15.000;30.000;0;
>> > load5=2.440;10.000;25.000;0; load15=2.720;5.000;20.000;0;
>> >
>> > *I added the following line on my remotehost to the /etc/sudoers:*
>> > nagios    ALL=(ALL) NOPASSWD:
>> >
>> /usr/sbin/smartctl,/usr/lib64/nagios/plugins/check_nrpe,/usr/lib64/nagios/plugins/check_smartmon
>> >
>> > I also try running the NRPE as adeamon and not with xinetd and I had the
>> > same issue.
>> >
>> > Any inputs?
>> >
>>
>

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