icinga2 - where to change client monitoring commands? - icinga

Question

system ubuntu 16.04
On master node where icinga2 is installed
#ls /etc/icinga2/repository.d/hosts/WIN-U52321E0BAK/
disk C%3A.conf disk.conf icinga.conf load.conf ping4.conf
ping6.conf procs.conf swap.conf users.conf
All conf files have save "dummy" check_command on them for example
#cat load.conf
object Service "load" {
import "satellite-service"
check_command = "dummy"
host_name = "WIN-U52321E0BAK"
zone = "WIN-U52321E0BAK"
}
I cant understand from where dummy command is called and how to customize the checks for warning and critical threshold

Answer 1

The dummy command is defined in /usr/share/icinga2/include/command-plugins.conf, like so:
144 object CheckCommand "dummy" {
145 import "plugin-check-command"
146
147 command = [
148 PluginDir + "/check_dummy",
149 "$dummy_state$",
150 "$dummy_text$"
151 ]
152
153 vars.dummy_state = 0
154 vars.dummy_text = "Check was successful."
155 }
In order to modify the warn and crit levels, you set the custom variable at the host or service level. Using the example of ping, we see the default configuration in that same file:
36 template CheckCommand "ping-common" {
37 import "plugin-check-command"
38
39 command = [ PluginDir + "/check_ping" ]
40
41 arguments = {
42 "-H" = "$ping_address$"
43 "-w" = "$ping_wrta$,$ping_wpl$%"
44 "-c" = "$ping_crta$,$ping_cpl$%"
45 "-p" = "$ping_packets$"
46 "-t" = "$ping_timeout$"
47 }
48
49 vars.ping_wrta = 100
50 vars.ping_wpl = 5
51 vars.ping_crta = 200
52 vars.ping_cpl = 15
53 }
Here's the important bit:
49 vars.ping_wrta = 100
50 vars.ping_wpl = 5
51 vars.ping_crta = 200
52 vars.ping_cpl = 15
So: we go to our host or service definition, thusly (using /etc/icinga2/conf.d/host.conf and the NodeName/localhost definition which everybody has; comments removed):
18 object Host NodeName {
20 import "generic-host"
21
23 address = "127.0.0.1"
24 address6 = "::1"
25
27 vars.os = "Linux"
30 vars.http_vhosts["http"] = {
31 http_uri = "/"
32 }
37
39 vars.disks["disk"] = {
41 }
42 vars.disks["disk /"] = {
43 disk_partitions = "/"
44 }
45 }
And we insert before line 45 above to produce:
18 object Host NodeName {
20 import "generic-host"
21
23 address = "127.0.0.1"
24 address6 = "::1"
25
27 vars.os = "Linux"
30 vars.http_vhosts["http"] = {
31 http_uri = "/"
32 }
37
39 vars.disks["disk"] = {
41 }
42 vars.disks["disk /"] = {
43 disk_partitions = "/"
44 }
45 vars.ping_wrta = 50
46 vars.ping_wpl = 3
47 vars.ping_crta = 10
48 vars.ping_cpl = 2
49 }
...and you have successfully customized the check threshold. You can add those variables to a template or even a hostgroup (I think; better test that, I may be wrong).