This document provides a 15 minute crash course on OMD (Open Monitoring Distribution) and Check_MK. It discusses what OMD and Check_MK are, the data collection process, how to deploy OMD and the Check_MK agent, and provides recommendations. OMD is not a Linux distribution but a set of tools for running multiple monitoring instances per host with separate users. Check_MK is a Nagios addon that provides automatic service detection, hierarchical configuration, and high performance passive checks. It then outlines how to install OMD, install and configure the Check_MK agent, create an OMD instance, and access the multisite interface. Security recommendations include filtering iptables to only allow traffic from the monitoring server.

1. Text
OMD & Check_MK
(15 minutes crash course)
arturmartins@gmail.com
6th March 2014
!

2. Agenda
What is OMD?
What is Check_MK?
Data collection process
Deployment (OMD and Check_MK agent)
Demo
Recommendations

3. What is OMD?
Open Monitoring Distribution - http://omdistro.org/
Not a Linux distro, just a group of tools
Features:
multiple instances per host
separate omd user per instance
etc

4. What is Check_MK?
Nagios add-on (Developed by Mathias Kettner)
Features:
Automatic Service-Detection
Rule-based, hierarchical configuration
High performance through passive checks
Creates Nagios configs for you :)

5. Data collection process

7. Install OMD (Debian/Ubuntu)
Add the official repo according to your distro
https://labs.consol.de/repo/stable/
aptitude update && aptitude install omd

8. Install Check_MK_agent
Install super server
aptitude install xinetd
Install check_mk_agent
dpkg -i check-mk-agent_1.2.4-2_all.deb
verify if the TCP port 6556 is open
netstat -tulp | grep 6556

9. Create OMD instance
Create a OMD instance for a new environment
omd create env_test
Activate instance
omd start env_test
Access multisite
http://omd/env_test/ - user:omdadmin pass:omd

11. Recommendations
Security! Install iptables and only accept the OMD
server
iptables -A INPUT -p tcp --dport 6556 -s X.X.X.X -j ACCEPT
iptables -A INPUT -p tcp --dport 6556 -j DROP

12. References
OMD:
http://omdistro.org
Check_MK project:
http://mathias-kettner.de/check_mk.html
Check_mk with Nagios:
http://www.onaxer.com/2010/10/21/check_mk-with-nagios/
Code from this slides:
https://github.com/arturmartins/omd-check_mk_starter

13. Questions?

14. “Thank you.”
—— Artur Martins
arturmartins@gmail.com