[Blue-devel] [blue - Developers] NRPE in Blue

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By: rob_blake

All,

I've been thinking about how we can build NRPE style checking into Blue, so
I'd like to start a discussion around this.

With the work that I've been doing on the Dynamic Registry, I have created a
very thin Blue Agent. This Agent could quite easily be extended to provide a
'NRPE service' which would essentially emulate the NRPE daemon from Nagios.
As far as I can see from NRPE it is no more complicated that opening up a socket
and listening for reuquests which are in the format

check_alias|check_args_if_allowed

This format seems to work so I don't think we should change it. I am also going
to propose that we go with the idea of the check_nrpe plugin. This plugin could
simply pass across the name of the plugin to be executed and any args to be
used with it. We could also provide an option for the transport to use so that
we support as many different network configurations as possible. So I guess
the execution would be something similar to

java -jar blue-check-nrpe -H <host_address> -P <port_of_listening_blue_agent>
-T <transport> -A <args> .......

This should also fit nicely with the dynamic registration work that I've been
doing as when a Host registers, it could also open a socket listening for NRPE'esque
checks at the same time.

For the minute we could provide a distribution of plugins that needs to be installed
on each remote host to faciliate remote checking. Looking further ahead I really
like the idea of providing a repository through which the remote host can dynamically
download plugins as and when required.


Any thoughts on this?

cheers

Rob

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