RRDcached is a daemon that caches a bunch of RRD write requests and apply them at once. This enables to speed up RRD files update. When you install Munin on OpenBSD, RRDcached is also installed by default. But there are things to do to actually use it. Here’s how I did it.
It’s been a while since I used Munin monitoring system. I felt like I was going to have a look at the (not so) new 2.0.x branch ; running on my brand new OpenBSD 5.7. As usual, everything is quite well documented in the man pages and readmes. So here are simply my notes with particular directions regarding my installation.
There are many times when I see IT managers not monitoring their user’s services at all or setup a general application and consider the job done. Most of the time, they realise much is missing when they have to report about (recurrent) issues regarding business critical services. Monitoring is not to be considered as a cure solution but as a forecast tool. When planned and configured as such, it’ll help prevent predicable failures and drive capacity planning.
For those who may not know, the “Freebox Revolution” is the 6th release of the access box from the French ADSL/FTTH provider named “Free”. In my case, it provides Internet access via FTTH. The box has a Web management interface from where you can configure and check statistics. The only “sad” news is that it does not provide any SNMP service. The only way to keep a eye on what goes through the ports is to log on the Web interface.
Here’s how I use the Web interface to grab metrics and show them in Xymon.
The Freebox Revolution has a nice management GUI which provides metrics about in/out traffic. Unfortunately, it can only be seen from the management pages when you’ve been authenticated.
Here’s a way to script the grab of the traffic pictures to show them in any Web page.