NRPE: Unable to read output

[Jake Solid]

Is there a different plugin similar to check_smartmon I can try that works
with check_nrpe ?

thanks in advanced.




On Tue, Aug 12, 2008 at 3:20 PM, Jake Solid <richardsolid at gmail.com> wrote:

> The following line will make all commands use sudo:
>
> command_prefix=/usr/bin/sudo
>
> I remove the comment for command_prefix=/usr/bin/sudo and add the following
> to the sudoers file:
>
> nagios    ALL=(ALL) NOPASSWD: /usr/sbin/smartctl,/usr/lib64/nagios/plugins/
>
> Now, I get the NRPE: Unable to read output for any plugin that gets
> invoked.
>
> The permissions of check_smartmon on the remote server are the same as the
> other plugins that are working.
>
> -rwxr-xr-x 1 root root 8.4K Aug  6 13:02 check_smartmon
>
>
> But I'm still not able to successfully invoke check_smartmon with
> check_nrpe from the nagios server.
>
>
>
>
> On Tue, Aug 12, 2008 at 2:25 PM, <kyle.odonnell at gmail.com> wrote:
>
>> 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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