Multiple remote checks
Andreas Ericsson
ae at op5.se
Mon Feb 21 16:41:07 CET 2005
Kaare Rasmussen wrote:
> Hi
>
> I would like to check some services running on servers behind a firewall from
> a Nagios server which is behind another firewall.
>
> Some options comes to mind:
>
> 1. check_by_ssh
> This will work, but i imagine that it will use lots of resources, given that
> there are perhaps 10 services per server to be checked.
> It would have to ssh to the remote firewall, and then from the firewall to
> each host for every service check.
>
> 2. nrpe
> Would require a hole in the remote firewall. Not sure that it would use less
> resources.
>
> 3. nsca
> Would require a hole in the local (nagios) firewall. Still a lot of connecting
> going on.
>
> 4. rel ?
> Could work, but I'm not sure that it's being maintained. Also, using mail as
> transport may not add to security. Or efficiency.
>
> 5. Do it myself
> I'm surprised that I couldn't find something like this:
> 5.1. Service check on remote systems will store results in a file.
> 5.2 Once in a while, nagios will collect this file through ssh and update the
> external command file.
> Is this stupid/unnecessary/done before?
>
Almost certainly done before. When firewalls are involved, it's usually
desirable to send things from the secure side to the open one, so that
the insecure part of the network never initates connections to the
secure side. With duplexed firewalls you'll have to open somewhere
anyway, so just make up your mind and get to work.
>
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--
Andreas Ericsson andreas.ericsson at op5.se
OP5 AB www.op5.se
Lead Developer
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