Nagios

Setting up OMD to get a working Nagios server is really simple, but what makes this monitoring setup really awesome is how easy Check___MK makes finding, configuring and running these checks. Setup the agent on your nodes, or just monitor SNMP/ping data, then tell Nagios/Check_MK which hosts to monitor and it will inventory and monitor all available checks it can find. This should create a check-mk-agent config file for xinetd at /etc/xinetd.d/check-mk-agent. We can edit one option for security, I haven’t tried running this as a regular user instead of root, but I should look into that. Uncomment the following line and specify your Nagios servers IP or hostname. ...

I’ve been a fan of Nagios for quite awhile. It has its issues, but with how easy it has become to setup with OMD and check discovery using Check_MK, I don’t know of anything else this powerful and simple to use. I’ll go over this first part which is the OMD installation and setup. ...

Here’s a short how-to on monitoring OpenIndiana (Solaris 11) that is running ZFS using Nagios, check___mk and check_mk_agent. This awesome open source tool makes setting up your servers to be checked by Nagios super easy. In the past I would manually create or edit the Nagios .cfg files for my environment and install various agents depending on OS architecture on the servers I wanted to monitor. Even though I am not monitoring a ton of servers it still took quite a bit of time. Now I use check_mk and Open Monitoring Distribution. I plan to write-up a more detailed post on OMD soon, but I found it’s a very impressive bundled Nagios package with many important addons and can easily be installed on every major Linux distribution. On to monitoring Solaris 11. ...

I don’t know how truly useful this is, but it’s kinda cool just for the geekiness. I installed this on Ubuntu Server 9.04 running Nagios 3.1.2. You will want to create a Twitter account just for sending these tweets. Setup a new account and go to https://dev.twitter.com and login with the Twiiter account you will be sending tweets from. Next, create a new application. After that you need to create Access Tokens for the application, you may have to refresh a bit to receive the tokens. ...

I haven’t tested this yet so not 100% sure it works. Looks interesting though and one of the better looking solutions for tweeting Nagios alerts since they moved to OAuth. http://jon.netdork.net/2010/10/13/nagios-notifications-via-twitter

A good tutuorial on using service checks by SSH.wiki.nagios.org Useful commands Verify config /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg Plugin directory /usr/local/nagios/libexec Commands directory /usr/local/nagios/etc/objects