nrpe/nsca or check_by_ssh
Marc Powell
marc at ena.com
Wed Aug 27 14:45:22 CEST 2008
On Aug 27, 2008, at 5:00 AM, J. Bakshi wrote:
> Dear list,
>
> I really need some suggestions/guideline regarding monitoring remote
> server by nagios.
>
> I have found three different ways to monitor remote hosts
>
> 1> NRPE
> 2> NSCA
> 3> check_by_ssh
>
> As I have already read at the manual that check_by_ssh gives load on
> the monitoring machine's CPU
check_by_ssh can be used to run any nagios plugin on remote unix-like
hosts, not just check_load. The plugin must be installed on the remote
host.
> So the other alternative is either NRPE or NSCA. What is the
> difference
> between these two ?
check_nrpe (from NRPE) is used to initiate an active check from the
nagios machine. It is called by nagios much like a normal plugin but
it works differently. check_nrpe contacts the nrpe daemon running on a
remote host and asks it to run a pre-configured check command and
returns the results to nagios.
NSCA is used when a passive check is initiated from a remote host. A
wrapper script on a remote host, called by cron or some other method,
executes a plugin there and passes the results to the send_nsca
program. send_nsca contacts the nsca daemon on the nagios machine
which passes the results of the check to nagios.
HTH,
Marc
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