As part of giving back to the community LCHost runs a Debian package mirror (including backports) (for i386 and amd64) which was recently added to the official mirrors list.
I spent a little time making it automatically detect changes at our source mirror within a couple of minutes and pull down, so at most it’ll never be more than 5 minutes behind the top-level mirrors.
To use our debian mirror, simply replace your regular mirror definition in /etc/apt/sources.list with:
deb http://mirror.lchost.net/debian/ stable main contrib
deb-src http://mirror.lchost.net/debian/ stable main contrib
(You may choose to use the release name in place of “stable” to ensure you never accidentally go between major releases – so for wheezy, simply replace the word stable with wheezy)
If you use backports, you can get those packages from us too, using something like:
deb http://mirror.lchost.net/debian/ wheezy-backports main
It’s pretty straightforward to install Nagios on a Debian system but if you want to be able to use the web interface to control the nagios process a little more work is required.
Starting with a blank slate (apt/dpkg will ensure any required prerequisites will be installed):
# apt-get install nagios3 apache2-suexec
You’ll be asked to set a password for the nagiosadmin user for the web interface.
Enable check_external_commands in Nagios to enable the ability to mute alarms, make comments, restart the nagios process etc from the web interface (pretty much invaluable, but be aware of the inherent risks in enabling the ability to influence the process from “outside”)
# sed -i -e 's/check_external_commands=0/check_external_commands=1/' /etc/nagios3/nagios.cfg
# /etc/init.d/nagios3 restart
Edit the nagios3 apache2 config include to make the web interface scripts run as the nagios user so that the web interface can write to the nagios command pipe; inserting the following at the top of /etc/nagios3/apache2.conf:
# /etc/init.d/apache2 restart
And you’re pretty much done! You can go to http://YOUR_HOST_NAME/nagios3/ and log in with your nagiosadmin password you set up when prompted at the start of this process.
Now, you can get started with creating host and service configuration files in /etc/nagios3/conf.d/ to monitor your servers/network/etc
So, I used to post this stuff onto a tumblr blog at http://cluebyfour.tumblr.com but decided that – frankly – I’m not exactly short of server resource, so I’ve moved what little content there was in-house.
Lately I have found that poor documentation – or simply vast documentation – has been irking me more and more and I’ll likely start documenting things I figure out for both my own sanity and that of others who follow in my footsteps.