Network Discovery

[Dan Stromberg]

Actually, isn't there some sort of script already available that does
this?

I'm cozy with nmap+grep+sed, you're cozy with nmap+grep+sed, but a
significant fraction of the world is not.

On Sun, 2005-01-16 at 13:34 +0100, Andreas Ericsson wrote:
> Steven Coutts wrote:
> > Is there anyway for Nagios to do automatic network discovery?
> > 
> 
> man nmap
> man grep
> man sed
> 
> Something like this should work;
> for ip in `nmap -sP -T Insane 192.168.0.1-254 | grep "appears to be up" 
> | gawk '{ print $2 }'`; do
> 	sed "s/@host@/$ip/" host.in >> hosts.cfg
> done
> 
> Where host.in look something like this
> define host{
>     use default-host-template
>     host_name @host at -name
>     address @host@
>     alias @host at -alias
> }
> 
> Then, supposing you have some way of getting a 
> tab/comma/semi-colon/whatever separated list of hostnames, ip's and 
> descriptions (in field order), you can do
> cat that_list | while read host_name ip alias; do
> 	sed -i -e "s/$ip-name/$host_name/" -e "s/$ip-alias/$alias/" hosts.cfg
> done
> 
> Mind the line-breaks.
> 
> > Or do I have to manually have to type all my hosts in the hosts.cfg file?
> > 
> 
> Then add a service PING to all hosts, as such;
> define service {
> 	use default-service
> 	service_description PING
> 	host_name *
> 	check_command check_ping!100.0,40%!500.0,80%
> }
> 
> Delete the nodes you don't want to monitor, and keep fiddling a bit.
> 
> I suggest you then divide the hosts into various groups depending on 
> what you want to check on them and simply add a bunch of services to the 
> proper hostgroups. It will save you a lot of typing.
> 
> 
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