https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/3/en/objectdefinitions.html
Nagios itself won't differentiate between the files you create or use to configure host monitoring. If you wanted you could create a separate file for each service and each command, though it would definitely create big mess. We start with this option here, to understand functioning.
Then you can rename your files to some other sort of extension like .cf_ or .cf*, so that nagios will ignore them. This way we can create a total new file like "touch nagios-server.cfg" and put all information into it. This way, we will have one .cfg file for each server we monitor.
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4 BASE NAGIOS ELEMENTS:
PLUG-INs - nagios executable programs : binaries, Perl or Bash scripts, etc.
COMMANDS - to launch plug-ins
HOST - Supervisable equipment , most likely with an IP address
SERVICE - something to supervise, like SSH, HTTP, DNS, DHCP etc.
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HOW TO DEFINE A COMMAND, exemple:
https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/objectdefinitions.html#command
# go to the our commands directory
cd /usr/local/nagios/nag_test_conf
# create a config file
nano command.cfg
# you add this for instance:
define command {
command_name check-ping-localhost
command_line $USER1$/check_ping -H localhost -w 40,40% -c 60,60%
}
#if you've opened /usr/local/nagios/etc/resource.cfg
# you would see that macro: $USER1$=/usr/local/nagios/libexec
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HOW TO DEFINE A HOST, example:
https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/objectdefinitions.html#host
# we will define for the moment simply our own server to probe
# probe with the check ping service
cd /usr/local/nagios/nag_test_conf
nano nag_test.cfg
define host {
host_name Nagios Server
address localhost
check_command check-ping-localhost
max_check_attempts 3
contacts nagiosadmin
}
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HOW TO DEFINE A SERVICE, exemple:
https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/objectdefinitions.html#service
cd /usr/local/nagios/nag_test_conf
nano nag_test.cfg
# we test adding an SSH service check
define command {
command_name check-ssh-localhost
command_line $USER1$/check_ssh localhost
}
# we apply it to our desired host (nag_host.cfg)
define service {
service_description SSH sur Nagios Server
host_name Nagios Server
check_command check-ssh-localhost
max_check_attempts 3
contacts nagiosadmin
check_period 24x7
notification_period 24x7
}
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PUT EVERYTHING INTO ONE FILE:
define command {
command_name check-ping-localhost
command_line $USER1$/check_ping -H localhost -w 40,40% -c 60,60%
}
define command {
command_name check-ssh-localhost
command_line $USER1$/check_ssh localhost
}
define host {
host_name Nagios Server
address localhost
check_command check-ping-localhost
max_check_attempts 3
contacts nagiosadmin
}
define service {
service_description SSH sur Nagios Server
host_name Nagios Server
check_command check-ssh-localhost
max_check_attempts 3
contacts nagiosadmin
check_period 24x7
notification_period 24x7
}
_dnhyper
