This document discusses Icinga2, a server monitoring tool written in C++ that serves as an alternative to Nagios. It outlines the features, installation commands, and configuration objects associated with Icinga2, including plugins like check_http, and details on service status and notifications. Additionally, it mentions the Icinga2 web interface and provides contact information for further inquiries.

1. Icinga2
Jakub Novotný

2. ▷ Server monitoring
▷ Complex tool
▷ Written in C++
▷ IcingaWeb2
What is Icinga2

3. ▷ Nagios
▷ Icinga
▷ Icinga2
History

4. ▷ Daemon
▷ Command icinga2 (as root)
o icinga2 … --help
o icinga2 feature list
o icinga2 feature enable feature_name
o icinga2 node wizard
How does it run?

5. ▷ every specific functionality
▷ apt-get install nagios-plugins
▷ /usr/lib/nagios/plugins
Plugins

6. ▷ any program which returns
o 0 - OK
o 1 - WARNING
o 2 - CRITICAL
▷ Message to STDOUT
▷ /usr/lib/nagios/plugins/plugin_name --help
▷ pass settings via parameters
Plugins

7. ▷ ./check_http -H www.seznam.cz
(OK, 302)
▷ ./check_http -H www.seznam.cz -S
(OK, 200)
▷ ./check_http -H www.seznam.cz -S -s 'Najdu tam co neznám'
(CRITICAL)
check_http Plugin

8. Configuration
▷ domain-specific language
▷ http://docs.icinga.org/icinga2/latest/doc/module/icinga2/toc#!/icinga2/late
st/doc/module/icinga2/chapter/language-reference
▷ /etc/icinga2/icinga2.conf
▷ loads other conf files with the
same structure

9. ▷ Host
▷ CheckCommand
▷ Service
▷ ServiceGroup
▷ User
▷ Notification
▷ ...
Configuration Objects

10. CheckCommand
object CheckCommand "https-check-string" {
import "plugin-check-command"
command = [PluginDir + "/check_http"]
arguments = {
"-H" = "$base_url$" // host
"-p" = "$port$" //
port
"-u" = "$path$" // context
path
"-s" = "$string$" // expected
string
"-e" = "$status$" // exp. resp.
status
"-S" = "" //
SSL
}
vars.status = "200" // default

11. Service Template
template Service "bluenomics-http-check" {
import "generic-service"
check_command = "http-check-string"
host_name = "bluenomics"
vars.base_url = "www.bluenomics.com"
}

12. Services - each for one
check
object Service "https-bluenomics-homepage" {
import "bluenomics-https-check"
vars.string = "Macroeconomic data in" //...
}
object Service "http-bluenomics-api-8080" {
import "bluenomics-http-check"
vars.path = "/api/"
vars.port = "8080"
vars.string = "bluenomics"
vars.status = "403"
}

13. Apply object
apply Service "ping4" {
import "generic-service"
check_command = "ping4"
assign where host.address
}

14. Service Status
▷ status
o OK,
o WARNING
o CRITICAL
o UNKNOWN
▷ status state
o Soft
o Hard

15. Service Status Settings
conf.d/templates.conf
template Service "generic-
service" {
max_check_attempts = 3
check_interval = 1m
retry_interval = 30s
}

16. Notifications
▷ email
▷ SMS
▷ user groups
▷ host groups
▷ service groups
▷ notification escalation

17. Icinga2 Web
▷ PHP frontend
▷ agavi framework
▷ bind with Icinga IDO

18. Icinga2 Web
▷ no settings
▷ dashboards and overviews
▷ accepting alerts
▷ http://icinga.keyup.eu/icinga
web2/

22. Díky za pozornost!
Otázky?
Jakub Novotný
jakub.novotny@keyup.eu