Bind rndc plugin

[ilyam8]

Unfortunately bind9 package in debian repository compiled without --with-libjson.

All our nameservers are debian7/debian8 and since they work well nobody will upgrade bind (compile from source with --with-libjson).

Current netdata plugins is not suitable for bind monitoring in our case. I think it is very common situation!

The old way to monitor bind is to dump named.stats and parse it (the way we do it now using munin).

The only drawback - bind append new dump to log. It is only mean you need to create logrotate conf file for it and don't set update_every to a low value.

Plugin is lightweight because it reads only the last part of dump (~ 11 Kilobyte in our case). It does not matter what file size is.

The logic is very simple:

1. check size
2. run 'rndc stats' to force bind to dump stats
3. open 'named.stats', jump to prev size.
4. parse last dump

There is a lot of information in dump but current charts only are:

1. Stats file size (alarm to warn user if size is too big included)
2. Name Server Statistic ( requests, response, failures, recursion and etc).

It is very easy to add more charts to it since all information is collected. But we need only Name Server Statistic and that is why i didn't add others. Will do this later.

[ktsaou]

I merged it, but I haven't tested it.
Is it ok?
Also, please remember the wiki...

[ilyam8]

Is it ok?
Also, please remember the wiki...

Yes and yes.

And i remember that i need to update README