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Monitor host A from host B through Nagios XI command
Posted: Fri Apr 24, 2020 9:35 am
by errevi
Hello,
I would like to implement a check that can ping host B from host A (both are Windows Server) through a check command sent by Nagios XI.
I saw something about nsclient++, can you help me to figure out what should I do in order to have:
- - command from Nagios XI e.g. check_hostB_through_hostA
- hostA receive the command and execute a ping to hostB
- the results are shown in Nagios XI interface
In this way I can see if host A is correctly pinging host B and eventually see ping latency between the two hosts.
Thanks
Nicolò
Re: Monitor host A from host B through Nagios XI command
Posted: Fri Apr 24, 2020 2:06 pm
by ssax
If you only really care about ping, setup NRPE in your nsclient.ini and enable CheckSystem/CheckNet on Host A:
Code: Select all
[/modules]
; Undocumented key
CheckExternalScripts = enabled
; Undocumented key
CheckHelpers = enabled
; CheckLogFile - File for checking log files and various other forms of updating text files
CheckLogFile = enabled
; Undocumented key
CheckEventLog = enabled
; Undocumented key
CheckNSCP = enabled
; Undocumented key
CheckDisk = enabled
; Undocumented key
CheckNet = enabled
; Undocumented key
CheckSystem = enabled
; Undocumented key
NSClientServer = enabled
; Undocumented key
NRPEServer = enabled
Code: Select all
[/settings/NRPE/server]
; ENABLE SSL ENCRYPTION - This option controls if SSL should be enabled.
use ssl = true
; ALLOW INSECURE CHIPHERS and ENCRYPTION - Only enable this if you are using legacy check_nrpe client.
insecure = true
; COMMAND ALLOW NASTY META CHARS - This option determines whether or not the we will allow clients to specify nasty (as in |`&><'"\[]{}) characters in arguments.
allow nasty characters = true
; EXTENDED RESPONSE - Send more then 1 return packet to allow response to go beyond payload size (requires modified client if legacy is true this defaults to false).
extended response = true
; PORT NUMBER - Port to use for NRPE.
port = 5666
; COMMAND ARGUMENT PROCESSING - This option determines whether or not the we will allow clients to specify arguments to commands that are executed.
allow arguments = true
Then restart the NSClient++ service.
Now test from the XI system like this:
Code: Select all
/usr/local/nagios/libexec/check_nrpe -H HostA -c check_ping -a 'host=HostB'
You can also do more if you setup NSClient++ on HostB as well.
Re: Monitor host A from host B through Nagios XI command
Posted: Mon Apr 27, 2020 7:39 am
by errevi
Hi, many thanks for your answer, yes at the moment I only need a ping.
The other step I did in order to bypass all SSL handshake errors are:
-
-
Edited check_nrpe command in nagios to:
Code: Select all
$USER1$/check_nrpe -H $HOSTADDRESS$ -2 -t 30 -c $ARG1$ $ARG2$
Is evertything right with this changes ?
I mean it works, but I don't know if it's best practice.
In the end my command is:
Code: Select all
/usr/local/nagios/libexec/check_nrpe -H HOST-A_FQDN -2 -t 30 -c check_ping -a 'host=HOST-B_FQDN'
And this is the output:
Code: Select all
OK: All 1 hosts are ok|'HOST-A_FQDN_loss'=0;5;10 'HOST-B_FQDN_time'=0;60;100
I don't understand what's the "_loss" and the "_time" means , from GUI I only have this output (image below)
And I would like to have the response time in my output, is that possible ?
Re: Monitor host A from host B through Nagios XI command
Posted: Mon Apr 27, 2020 4:18 pm
by ssax
That looks fine.
loss is the percentage of packets lost.
time is the total time in seconds.
You can see the defaults this way:
Code: Select all
/usr/local/nagios/libexec/check_nrpe -H HOST-A_FQDN -2 -t 30 -c check_ping -a 'host=HOST-B_FQDN' show-default
See here as well:
https://docs.nsclient.org/reference/misc/CheckNet/
Re: Monitor host A from host B through Nagios XI command
Posted: Tue Apr 28, 2020 2:31 am
by errevi
Hi, thanks again, it works.
I changed the packet size and added
set it to "show-all" and I have all the info I need, output:
OK: 1/1 (<ip_address> Packet loss = 0%, RTA = 0ms)
Thanks
Regards
Re: Monitor host A from host B through Nagios XI command
Posted: Tue Apr 28, 2020 12:27 pm
by ssax
Awesome, glad you got it working! Are we okay to lock this up and mark it as resolved or do you have any related questions?
Re: Monitor host A from host B through Nagios XI command
Posted: Wed Apr 29, 2020 5:42 am
by errevi
Yes, I'm ok, you can close the topic.
Nic