host dependencies configurations

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chandasandeep
Posts: 8
Joined: Sun Dec 04, 2016 11:38 pm

host dependencies configurations

Post by chandasandeep »

Moderator Edit: This thread has been split from another - https://support.nagios.com/forum/viewto ... =7&t=35913
In the future, please create a new thread and link to the old one instead of adding on.

Hi Team,

Could you please help me out from this issue.

We have linux servers in two data centers with different network. My nagios is in xyz data center and ABC data center, getting server down alerts when VPN disconnected as it has in different network.

I go through the link and configured as https://assets.nagios.com/downloads/nag ... 1478502227
i have configured for host dependency as given below.

Code: Select all

define hostdependency{
	host_name			AZMRDC01
	dependent_host_name		10.175.23.1
	notification_failure_criteria	d,
	}

Code: Select all

define hostdependency{
	host_name			TDMRDC01
	dependent_host_name		10.175.23.1
	notification_failure_criteria	d,u
	}
However getting error messages as given below.

Code: Select all

[root@azmrns01 hosts]# service nagios restart
Restarting nagios (via systemctl):  Job for nagios.service failed because the control process exited with error code. See "systemctl status nagios.service" and "journalctl -xe" for details.
                                                           [FAILED]
[root@azmrns01 hosts]# tail -f /var/log/messages
Dec  5 04:31:42 azmrns01 nagios: Check your configuration file(s) to ensure that they contain valid
Dec  5 04:31:42 azmrns01 nagios: directives and data defintions.  If you are upgrading from a previous
Dec  5 04:31:42 azmrns01 nagios: version of Nagios, you should be aware that some variables/definitions
Dec  5 04:31:42 azmrns01 nagios: may have been removed or modified in this version.  Make sure to read
Dec  5 04:31:42 azmrns01 nagios: the HTML documentation regarding the config files, as well as the
Dec  5 04:31:42 azmrns01 nagios: 'Whats New' section to find out what has changed.
Dec  5 04:31:42 azmrns01 systemd: nagios.service: control process exited, code=exited status=8
Dec  5 04:31:42 azmrns01 systemd: Failed to start LSB: Starts and stops the Nagios monitoring server.
Dec  5 04:31:42 azmrns01 systemd: Unit nagios.service entered failed state.
Dec  5 04:31:42 azmrns01 systemd: nagios.service failed.
Last edited by dwhitfield on Mon Dec 12, 2016 12:53 pm, edited 1 time in total.
Reason: code blocks FTW
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tgriep
Madmin
Posts: 9190
Joined: Thu Oct 30, 2014 9:02 am

Re: host dependencies configurations

Post by tgriep »

Can you run the following verification command on the Nagios server and post the output here?

Code: Select all

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Thanks
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chandasandeep
Posts: 8
Joined: Sun Dec 04, 2016 11:38 pm

Re: host dependencies configurations

Post by chandasandeep »

Hi Thanks for your reply.

here the output of verification command for nagios

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[root@azmrns01 hosts]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios Core 4.0.8
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 08-12-2014
License: GPL

Website: http://www.nagios.org
Reading configuration data...
   Read main config file okay...
Warning: Duplicate definition found for service 'disk write queue length' on host 'TDMRAXSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXSQL01.cfg', starting on line 218)
Warning: Duplicate definition found for service 'disk read queue length' on host 'TDMRAXSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXSQL01.cfg', starting on line 209)
Warning: Duplicate definition found for service 'disk write queue length' on host 'TDMRAXDEVSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXDEVSQL01.cfg', starting on line 218)
Warning: Duplicate definition found for service 'disk read queue length' on host 'TDMRAXDEVSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXDEVSQL01.cfg', starting on line 209)
Warning: Duplicate definition found for service 'disk write queue length' on host 'TDMRSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSQL01.cfg', starting on line 233)
Warning: Duplicate definition found for service 'disk read queue length' on host 'TDMRSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSQL01.cfg', starting on line 224)
Warning: Duplicate definition found for service 'data buffer cache hit ratio' on host 'TDMRSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSQL01.cfg', starting on line 198)
Warning: Duplicate definition found for service 'SQL connection time' on host 'TDMRSQL01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSQL01.cfg', starting on line 190)
Warning: Duplicate definition found for service 'disk write queue length' on host 'AZMRAXSQL01' (config file '/usr/local/nagios/etc/objects/hosts/AZMRAXSQL01.cfg', starting on line 213)
Warning: Duplicate definition found for service 'disk read queue length' on host 'AZMRAXSQL01' (config file '/usr/local/nagios/etc/objects/hosts/AZMRAXSQL01.cfg', starting on line 204)
Warning: Duplicate definition found for service 'sql service CPU privileged time' on host 'TDMRAXDW01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXDW01.cfg', starting on line 295)
Warning: Duplicate definition found for service 'disk write queue length' on host 'TDMRAXDW01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXDW01.cfg', starting on line 204)
Warning: Duplicate definition found for service 'disk read queue length' on host 'TDMRAXDW01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXDW01.cfg', starting on line 195)
Warning: Duplicate definition found for service 'disk write queue length' on host 'TDMRSRS01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSRS01.cfg', starting on line 249)
Warning: Duplicate definition found for service 'disk read queue length' on host 'TDMRSRS01' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSRS01.cfg', starting on line 240)
Warning: Duplicate definition found for service 'disk write queue length' on host 'TDMRSQL02' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSQL02.cfg', starting on line 221)
Warning: Duplicate definition found for service 'disk read queue length' on host 'TDMRSQL02' (config file '/usr/local/nagios/etc/objects/hosts/TDMRSQL02.cfg', starting on line 212)
Warning: Duplicate definition found for service 'disk write queue length' on host 'AZMRDEVAXSQL01' (config file '/usr/local/nagios/etc/objects/hosts/AZMRDEVAXSQL01.cfg', starting on line 199)
Warning: Duplicate definition found for service 'disk read queue length' on host 'AZMRDEVAXSQL01' (config file '/usr/local/nagios/etc/objects/hosts/AZMRDEVAXSQL01.cfg', starting on line 190)
Warning: Duplicate definition found for service 'disk write queue length' on host 'TDMRAXSQL02' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXSQL02.cfg', starting on line 220)
Warning: Duplicate definition found for service 'disk read queue length' on host 'TDMRAXSQL02' (config file '/usr/local/nagios/etc/objects/hosts/TDMRAXSQL02.cfg', starting on line 211)
Error: Invalid max_check_attempts value for host 'gateway'
Error: Could not register host (config file '/usr/local/nagios/etc/objects/hosts/host-gateway.cfg', starting on line 2)
   Error processing object config files!


***> One or more problems was encountered while processing the config files...

     Check your configuration file(s) to ensure that they contain valid
     directives and data defintions.  If you are upgrading from a previous
     version of Nagios, you should be aware that some variables/definitions
     may have been removed or modified in this version.  Make sure to read
     the HTML documentation regarding the config files, as well as the
     'Whats New' section to find out what has changed.

Code: Select all

[root@azmrns01 hosts]# more host-gateway.cfg
# a host definition for the gateway of the default route
define host {
        host_name       gateway
        alias           Default Gateway
        address         10.175.23.1
        use             generic-host
        }
Note : My requirement is network dependency between two data centers. servers are in two data centers, nagios is in xyz data center. and second data center servers are getting down alerts when vpn disconnected. when we check manually those servers are up and running fine. So, we are trying to configure above scenario. Could you please advise me what is the best solution to fix this issue.

Thanks,
Sandeep
Last edited by dwhitfield on Mon Dec 12, 2016 1:31 pm, edited 1 time in total.
Reason: code blocks FTW
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tgriep
Madmin
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Re: host dependencies configurations

Post by tgriep »

First, to fix the max_check_attempts error, you could either add that entry directly to that host's settings or you can edit the generic-host template and add it there.
Once one of those are done, that should fix the error for you.
BTW, you may also need to setup these required settings.

Code: Select all

check_interval 
retry_interval
About receiving the notifications for when the VPN link is down. You can setup parent child relationship for the remote site so when Nagios detects that the link is down, it will stop sending notifications for the remote hosts.
Take a look at this link for more details on that.
https://assets.nagios.com/downloads/nag ... ility.html
Be sure to check out our Knowledgebase for helpful articles and solutions!
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chandasandeep
Posts: 8
Joined: Sun Dec 04, 2016 11:38 pm

Re: host dependencies configurations

Post by chandasandeep »

Hi Thank you for assistance.

successfully i have configured gateway

[root@azmrns01 hosts]# cat host-gateway.cfg
# a host definition for the gateway of the default route
define host{
host_name Gateway
alias Bogus Router #1
address 10.175.23.81
check_command check-host-alive
check_interval 1
retry_interval 1
max_check_attempts 5
check_period 24x7
process_perf_data 0
retain_nonstatus_information 0
contact_groups admins
notification_interval 2
notification_period 24x7
notification_options d,u,r
}

and here are dependencies in same gateway config file.

define hostdependency{
host_name AZMRDC01
dependent_host_name Gateway
notification_failure_criteria d
}

define hostdependency{
host_name TDMRAXDEVSQL01
dependent_host_name Gateway
notification_failure_criteria d,u
}

Note : My question is when vpn disconnected between AZMRDC01 and TDMRAXDEVSQL01 network. we have to get host unreachable or etc alerts on TDMRAXDEVSQL01 server. please let me know where and how should i place set up.

thanks in advance.
Sandeep
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tgriep
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Re: host dependencies configurations

Post by tgriep »

If you want to receive the unreachable notification for that host, you will have to make sure the contact is setup to receive the unreachable messages.
So edit that contact and make sure the host_notification_options are setup correctly.
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chandasandeep
Posts: 8
Joined: Sun Dec 04, 2016 11:38 pm

Re: host dependencies configurations

Post by chandasandeep »

Hi

edited contact as given below and given host_notification_options too.

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define contact{
        contact_name                    reddalerts             ; Short name of user
        use                             generic-contact         ; Inherit default values from generic-contact template (defined above)
        alias                           redd Admin            ; Full name of user
        host_notification_options       d,u,r
        email                          [email protected]
     }
in abc host i have setup configuration like given below which is throwing alerts when host got down

Code: Select all

define hostdependency{
        host_name                       AZMRDC01
        dependent_host_name             TDMRAXDEVSQL01
        notification_failure_criteria   d,u
        }
in gateway configuration file i have setup configuration like given below for host dependencies.

Code: Select all

define hostdependency{
       host_name                       AZMRDC01
       dependent_host_name             Gateway
       notification_failure_criteria   d
       }

Code: Select all

define hostdependency{
       host_name                       TDMRAXDEVSQL01
       dependent_host_name             Gateway
       notification_failure_criteria   d,u
       }
bit confusion over host dependency configuration. could you please advise me
Last edited by dwhitfield on Mon Dec 12, 2016 1:29 pm, edited 1 time in total.
Reason: code blocks FTW
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dwhitfield
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Contact dwhitfield

Re: host dependencies configurations

Post by dwhitfield »

@chandasandeep, it's unclear to me where we are with this. You mention you get alerts when the host goes down. That sounds good.

Then, you mention you are confused about the host dependency configuration. Are you still getting error messages? If so, which ones? What, if anything, is not working?

If you are just looking for a bit more information on how it all fits together, we can do that, but I just want to make sure we are addressing the correct issue. Thanks!

In general, you can find information on dependencies at https://assets.nagios.com/downloads/nag ... ncies.html
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