How to do icinga Configuration Validation 

Once you’ve edited the configuration files make sure to tell Icinga 2 to validate the configuration changes. Icinga 2 will log any configuration error including a hint on the file, the line number and the affected configuration line itself.

The following example creates an apply rule without any assign condition.

apply Service "my-ping4" {
  import "generic-service"
  check_command = "ping4"
  //assign where host.address
}Code language: JavaScript (javascript)

Validate the configuration:

# icinga2 daemon -C

[2014-05-22 17:07:25 +0200] critical/ConfigItem: Location:
/etc/icinga2/conf.d/tests/my.conf(5): }
/etc/icinga2/conf.d/tests/my.conf(6):
/etc/icinga2/conf.d/tests/my.conf(7): apply Service "my-ping4" {
                                        ^^^^^^^^^^^^^
/etc/icinga2/conf.d/tests/my.conf(8):   import "test-generic-service"
/etc/icinga2/conf.d/tests/my.conf(9):   check_command = "ping4"

Config error: 'apply' is missing 'assign'
[2014-05-22 17:07:25 +0200] critical/ConfigItem: 1 errors, 0 warnings.
Icinga 2 detected configuration errors.Code language: PHP (php)

Troubleshooting Reference – https://icinga.com/docs/icinga-2/latest/doc/15-troubleshooting/

List Configuration Objects

The icinga2 object list CLI command can be used to list all configuration objects and their attributes. The tool also shows where each of the attributes was modified.

That way you can also identify which objects have been created from your apply rules.

# icinga2 object list

Object 'localhost!ssh' of type 'Service':
  * __name = 'localhost!ssh'
  * check_command = 'ssh'
    % = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 5:3-5:23
  * check_interval = 60
    % = modified in '/etc/icinga2/conf.d/templates.conf', lines 24:3-24:21
  * host_name = 'localhost'
    % = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 4:3-4:25
  * max_check_attempts = 3
    % = modified in '/etc/icinga2/conf.d/templates.conf', lines 23:3-23:24
  * name = 'ssh'
  * retry_interval = 30
    % = modified in '/etc/icinga2/conf.d/templates.conf', lines 25:3-25:22
  * templates = [ 'ssh', 'generic-service' ]
    % += modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 1:0-7:1
    % += modified in '/etc/icinga2/conf.d/templates.conf', lines 22:1-26:1
  * type = 'Service'
  * vars
    % += modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 6:3-6:19
    * sla = '24x7'
      % = modified in '/etc/icinga2/conf.d/hosts/localhost/ssh.conf', lines 6:3-6:19

[...]Code language: PHP (php)

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