Howto use externally updated rrd files + BONUS TRACK

Cacti itself provides a very flexible and fast data gatherer, but situations may occur, where this is not what you want. Assuming, that there already is some rrd file filled by other means, question arises how to use this with cacti's flexible rrdtool front-end administration facilities.

Sometimes people call this feature "Importing external rrds" to cacti. But what I'm going to explain is not an automated function. It will require some manual interaction.

Of course, the webserver must have at least read access to the required rrd file(s). For sake of easiness, I'll assume the file to be located in cacti's default ./rra/ directory. In my examples, this file is called example.rrd.

As always: Use this on your own risk