Nagios Support Forum

Hi all,

I have installed nagios-4.4.6 version on my Raspbian GNU/Linux 10.
This operating system is installed on a Raspbery PI 4.
Everything seems to be fine but I can't start the Nagios service, I get the following error.

root@raspberrypi:/usr/local/nagios/etc# service nagios restart
Job for nagios.service failed because the control process exited with error code.
See "systemctl status nagios.service" and "journalctl -xe" for details.
root@raspberrypi:/usr/local/nagios/etc#

systemctl status nagios.service says:

root@raspberrypi:/usr/local/nagios/etc# systemctl status nagios.service
● nagios.service - Nagios Core 4.4.6
Loaded: loaded (/lib/systemd/system/nagios.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Wed 2021-07-21 12:38:58 CEST; 57s ago
Docs: https://www.nagios.org/documentation
Process: 5847 ExecStartPre=/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg (code=exited, status=1/FAILURE)
Process: 5848 ExecStopPost=/usr/bin/rm -f /usr/local/nagios/var/rw/nagios.cmd (code=exited, status=0/SUCCESS)

Jul 21 12:38:58 raspberrypi nagios[5847]: ***> One or more problems was encountered while processing the config files...
Jul 21 12:38:58 raspberrypi nagios[5847]: Check your configuration file(s) to ensure that they contain valid
Jul 21 12:38:58 raspberrypi nagios[5847]: directives and data definitions. If you are upgrading from a previous
Jul 21 12:38:58 raspberrypi nagios[5847]: version of Nagios, you should be aware that some variables/definitions
Jul 21 12:38:58 raspberrypi nagios[5847]: may have been removed or modified in this version. Make sure to read
Jul 21 12:38:58 raspberrypi nagios[5847]: the HTML documentation regarding the config files, as well as the
Jul 21 12:38:58 raspberrypi nagios[5847]: 'Whats New' section to find out what has changed.
Jul 21 12:38:58 raspberrypi systemd[1]: nagios.service: Control process exited, code=exited, status=1/FAILURE
Jul 21 12:38:58 raspberrypi systemd[1]: nagios.service: Failed with result 'exit-code'.
Jul 21 12:38:58 raspberrypi systemd[1]: Failed to start Nagios Core 4.4.6.
root@raspberrypi:/usr/local/nagios/etc#



Also journalctl -xe says:

--
-- The unit nagios.service has entered the 'failed' state with result 'exit-code'.
Jul 21 12:40:30 raspberrypi systemd[1]: Failed to start Nagios Core 4.4.6.
-- Subject: A start job for unit nagios.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit nagios.service has finished with a failure.
--
-- The job identifier is 2430 and the job result is failed.
Jul 21 12:42:55 raspberrypi systemd[1]: Starting Nagios Core 4.4.6...
-- Subject: A start job for unit nagios.service has begun execution
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit nagios.service has begun execution.
--
-- The job identifier is 2487.
Jul 21 12:42:55 raspberrypi nagios[5940]: Nagios Core 4.4.6
Jul 21 12:42:55 raspberrypi nagios[5940]: Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Jul 21 12:42:55 raspberrypi nagios[5940]: Copyright (c) 1999-2009 Ethan Galstad
Jul 21 12:42:55 raspberrypi nagios[5940]: Last Modified: 2020-04-28
Jul 21 12:42:55 raspberrypi nagios[5940]: License: GPL
Jul 21 12:42:55 raspberrypi nagios[5940]: Website: https://www.nagios.org
Jul 21 12:42:55 raspberrypi nagios[5940]: Reading configuration data...
Jul 21 12:42:55 raspberrypi nagios[5940]: Read main config file okay...
Jul 21 12:42:55 raspberrypi nagios[5940]: Error: Invalid host object directive 'address 172.20.61.175'.
Jul 21 12:42:55 raspberrypi nagios[5940]: Error: Could not add object property in file '/usr/local/nagios/etc/hosts/linux-host1.cfg' on line 20.
Jul 21 12:42:55 raspberrypi nagios[5940]: Error: Invalid max_check_attempts value for host 'linux-host1'
Jul 21 12:42:55 raspberrypi nagios[5940]: Error: Could not register host (config file '/usr/local/nagios/etc/hosts/linux-host1.cfg', starting on line 16)
Jul 21 12:42:55 raspberrypi nagios[5940]: Error processing object config files!
Jul 21 12:42:55 raspberrypi nagios[5940]: ***> One or more problems was encountered while processing the config files...
Jul 21 12:42:55 raspberrypi nagios[5940]: Check your configuration file(s) to ensure that they contain valid
Jul 21 12:42:55 raspberrypi nagios[5940]: directives and data definitions. If you are upgrading from a previous
Jul 21 12:42:55 raspberrypi nagios[5940]: version of Nagios, you should be aware that some variables/definitions
Jul 21 12:42:55 raspberrypi nagios[5940]: may have been removed or modified in this version. Make sure to read
Jul 21 12:42:55 raspberrypi nagios[5940]: the HTML documentation regarding the config files, as well as the
Jul 21 12:42:55 raspberrypi nagios[5940]: 'Whats New' section to find out what has changed.
Jul 21 12:42:55 raspberrypi systemd[1]: nagios.service: Control process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- An ExecStartPre= process belonging to unit nagios.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Jul 21 12:42:55 raspberrypi systemd[1]: nagios.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit nagios.service has entered the 'failed' state with result 'exit-code'.
Jul 21 12:42:55 raspberrypi systemd[1]: Failed to start Nagios Core 4.4.6.
-- Subject: A start job for unit nagios.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit nagios.service has finished with a failure.
--
-- The job identifier is 2487 and the job result is failed.


/usr/local/nagios/etc/services (linux-host1.cfg file) it's like:

define service{
use generic-service
host_name linux-host1
service_description check-host-alive
check_command check-host-alive
}

also, /usr/local/nagios/etc/hosts (linux-host1.cfg file) it's like:

define host{
name linux-box ; Name of this template
use generic-host ; Inherit default values
check_period 24x7
check_interval 5
retry_interval 1
max_check_attempts 10
check_command check-host-alive
notification_period 24x7
notification_interval 30
notification_options d,r
contact_groups admins
register 0 ; DONT REGISTER THIS - ITS A TEMPLATE
}

define host{
use linux-box ; Inherit default values from a template
host_name linux-host1 ; The name we're giving to this server
alias linux ; A longer name for the server
address 172.20.61.175 ; IP address of Remote Linux host
}


Sorry for the whole paragraph & my english, but this is my first time interacting with this system and I don't have much experience.
Can you tell me where I am going wrong?

Thanks in advance.

BR.

at first glance, it looks like it doesn't like the following--
Jul 21 12:42:55 raspberrypi nagios[5940]: Error: Invalid max_check_attempts value for host 'linux-host1'

a couple things to try-
1) comment that line out and see if it works. without digging into that parameter further, I would guess that there is a default value.
2) research to see what values that parameter accepts. Maybe it doesn't like a double digit value.

It seems to be solved by modifying some parameters in some .CFGs.
Sorry, I'm new to this.

Thanks for the help.