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CentOS - Unable to monitor Redhat OS

https://support.nagios.com/forum/viewtopic.php?t=31385

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Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 12:15 am
by Box293
Thanks for that.

So now what output do you get when you run this at the command line of your Nagios XI host:

Code: Select all

/usr/local/nagios/libexec/check_nrpe -H 192.168.168.12 -c check_disk -a '-w 20% -c 10% -p /'
Also, on your remote host, ssh to it and run these commands and show us the output:

Code: Select all

su nagios
/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 1:28 am
by timlee
Box293 wrote:Thanks for that.

So now what output do you get when you run this at the command line of your Nagios XI host:

Code: Select all

/usr/local/nagios/libexec/check_nrpe -H 192.168.168.12 -c check_disk -a '-w 20% -c 10% -p /'
Also, on your remote host, ssh to it and run these commands and show us the output:

Code: Select all

su nagios
/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
Thanks for following up.

From Nagios XI:

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[root@NagiosCentOS6 ~]# /usr/local/nagios/libexec/check_nrpe -H 192.168.168.123 -c check_disk -a '-w 20% -c 10% -p /'
CHECK_NRPE: Received 0 bytes from daemon.  Check the remote server logs for error messages.
From remote host:

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[root@localhost ~]# /usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
DISK OK - free space: / 4754 MB (67% inode=84%);| /=2330MB;5976;6723;0;7470
Remote host log:

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[root@localhost ~]# tail /var/log/messages
Feb 12 01:25:48 localhost nrpe[10999]: Client request was invalid, bailing out...
Feb 12 01:25:48 localhost xinetd[25224]: EXIT: nrpe status=0 pid=10999 duration=0(sec)
Feb 12 01:26:10 localhost xinetd[25224]: START: nrpe pid=11128 from=::ffff:192.168.168.124
Feb 12 01:26:10 localhost nrpe[11128]: Error: Request contained command arguments, but argument option is not enabled!
Feb 12 01:26:10 localhost nrpe[11128]: Client request was invalid, bailing out...
Feb 12 01:26:10 localhost xinetd[25224]: EXIT: nrpe status=0 pid=11128 duration=0(sec)
Feb 12 01:26:11 localhost xinetd[25224]: START: nrpe pid=11129 from=::ffff:192.168.168.127
Feb 12 01:26:11 localhost nrpe[11129]: Error: Request contained command arguments, but argument option is not enabled!
Feb 12 01:26:11 localhost nrpe[11129]: Client request was invalid, bailing out...
Feb 12 01:26:11 localhost xinetd[25224]: EXIT: nrpe status=0 pid=11129 duration=0(sec)

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 1:37 am
by Box293
On the remote host, I'm pretty sure these steps haven't been done:

Edit /usr/local/nagios/etc/nrpe.cfg
Change:

Code: Select all

dont_blame_nrpe=0
To:

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dont_blame_nrpe=1

Code: Select all

service xinetd restart
Also, your remote host test shows the test being executed as root, please make sure you do the test like this:

Code: Select all

su nagios
/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 9:44 pm
by timlee
Box293 wrote:On the remote host, I'm pretty sure these steps haven't been done:

Edit /usr/local/nagios/etc/nrpe.cfg
Change:

Code: Select all

dont_blame_nrpe=0
To:

Code: Select all

dont_blame_nrpe=1

Code: Select all

service xinetd restart
Also, your remote host test shows the test being executed as root, please make sure you do the test like this:

Code: Select all

su nagios
/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
running the check_disk command as nagios user works. I have verified that the remote host dont_blame is set to 1.

Now i'm getting another type of error on most of the services (except load,ping,users) - e.g.(NRPE: Command 'check_disk' not defined)
Please help.

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 10:03 pm
by Box293
On the remote machine, in the file:
/usr/local/nagios/etc/nrpe.cfg

Can you confirm if this exists:
include_dir=/usr/local/nagios/etc/nrpe

If it does, does check_disk exist inside of /usr/local/nagios/etc/nrpe/common.cfg ?

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 10:27 pm
by timlee
Box293 wrote:On the remote machine, in the file:
/usr/local/nagios/etc/nrpe.cfg

Can you confirm if this exists:
include_dir=/usr/local/nagios/etc/nrpe

If it does, does check_disk exist inside of /usr/local/nagios/etc/nrpe/common.cfg ?
Hi, it shows this:

Code: Select all

# INCLUDE CONFIG FILE
# This directive allows you to include definitions from an external config file.

#include=<somefile.cfg>



# INCLUDE CONFIG DIRECTORY
# This directive allows you to include definitions from config files (with a
# .cfg extension) in one or more directories (with recursion).

#include_dir=<somedirectory>
#include_dir=<someotherdirectory>
I changed the directory to this:

Code: Select all

# INCLUDE CONFIG DIRECTORY
# This directive allows you to include definitions from config files (with a
# .cfg extension) in one or more directories (with recursion).

#include_dir=/usr/local/nagios/etc/nrpe
Under /usr/local/nagios/etc/nrpe/common.cfg, I suppose it exist.

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### DISK ###
command[check_disk]=/usr/local/nagios/libexec/check_disk $ARG1$
command[check_ide_smart]=/usr/local/nagios/libexec/check_ide_smart $ARG1$

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 10:29 pm
by Box293
Almost there.

Change This:

Code: Select all

#include_dir=/usr/local/nagios/etc/nrpe
To This:

Code: Select all

include_dir=/usr/local/nagios/etc/nrpe

Code: Select all

service xinetd restart

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 10:40 pm
by timlee
Box293 wrote:Almost there.

Change This:

Code: Select all

#include_dir=/usr/local/nagios/etc/nrpe
To This:

Code: Select all

include_dir=/usr/local/nagios/etc/nrpe

Code: Select all

service xinetd restart
Thanks heaps! It works! I think we are almost done, just a couple of checks left...

1) Sendmail with error *** sendmail: Nok ***
2) System Logging Daemon NRPE: Unable to read output
3) Yum Updates YUM WARNING: O/S requires an update (Which I think i can ignore at this point of time)

Please advise. :D

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 10:47 pm
by Box293
timlee wrote:Thanks heaps! It works! I think we are almost done, just a couple of checks left...
Excellent!
timlee wrote:1) Sendmail with error *** sendmail: Nok ***
2) System Logging Daemon NRPE: Unable to read output
3) Yum Updates YUM WARNING: O/S requires an update (Which I think i can ignore at this point of time)
1 & 2
Configure - > Core Configuration Mananger
Monitoring -> Services
Find one of the services that is not currently working
Click the Disk icon for it
Paste the contents of the output from the disk icon here in a code block.

3
Do a yum update on the remote host to install the updates.

Re: CentOS - Unable to monitor Redhat OS

Posted: Thu Feb 12, 2015 10:57 pm
by timlee
1 & 2
Configure - > Core Configuration Mananger
Monitoring -> Services
Find one of the services that is not currently working
Click the Disk icon for it
Paste the contents of the output from the disk icon here in a code block.

3
Do a yum update on the remote host to install the updates.
For Sendmail:

Code: Select all

define service {
	host_name			192.168.168.123
	service_description		Sendmail
	use				xiwizard_nrpe_service
	check_command			check_nrpe!check_services!-a 'sendmail'
	max_check_attempts		5
	check_interval			5
	retry_interval			1
	check_period			xi_timeperiod_24x7
	notification_interval		60
	notification_period		xi_timeperiod_24x7
	contacts			nagiosadmin
	_xiwizard			linux-server
	register			1
	}
For Syslog:

Code: Select all

define service {
	host_name			192.168.168.123
	service_description		System Logging Daemon
	use				xiwizard_nrpe_service
	check_command			check_nrpe!check_init_service!-a 'syslog'
	max_check_attempts		5
	check_interval			5
	retry_interval			1
	check_period			xi_timeperiod_24x7
	notification_interval		60
	notification_period		xi_timeperiod_24x7
	contacts			nagiosadmin
	_xiwizard			linux-server
	register			1
	}
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