Re: munin node proxy?

S. Banerian wrote:
> I have used munin for a while now, and find it useful.  I have found a
> need for a way to avoid use of snmp to monitor some devices on a
> protected subnet, and am wondering if there is some way to 'proxy'
> requests from a munin server out in the world, to munin-nodes that are
> in a private subnet.
> 
> The topology would be analogous to what is done with snmp plugins.
> 
> Public            "gateway"        private
> 
> munin-server -->  munin-proxy ---> munin-node #1
>                      |-----------> munin-node #2
>                      |-----------> munin-node #3

I've thought of this (http://munin.projects.linpro.no/ticket/424), but
I'm far from implementing it myself.  When I think of it now I think it
should be sort of easy.

Envision a wildcard plugin called proxy_ which could be symlinked as
proxy_foo.example.com_df to get df from foo.example.com.  It will have
to supply a hostname header for "config" requests and otherwise re-play,
more or less, what the munin node at foo.example.com says.  It might
even be doable with shell-script and the help of netcat.  Very very roughly:

# Do whatever to pick out the wildcard arguments.

replay() {
  (echo "$3"; echo quit) | nc $1 $2
}

case $1 in
  config) echo hostname $hostname
          replay $hostname 4949 "config $plugin";;
  '')     replay $hostname 4949 "fetch $plugin";;
esac


You might need to apply some sed or some such to remove stuff from nc
that is not wanted.

I would be very happy indeed if someone took the trouble to get this
working.

Nicolai

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