Network tuning for Nagios with slave servers

[kyle.odonnell at gmail.com]

Could always try:

net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack = 0

On 9/7/07, Andreas Ericsson <ae at op5.se> wrote:
> Wheeler, JF (Jonathan) wrote:
> > Our configuration is quite large (830 hosts, 160700+ services),
>
> You run more than 193 checks against each host? Good gods, you must
> be *really* curious about the state of those hosts :)
>
> > so have
> > implemented a master/slave configuration for Nagios (the Nagios servers
> > are running Linux).  The master server only runs checks if a check
> > becomes stale; i.e. it should have been checked by a slave but no result
> > has been received, but I find that (for example), in the last days log
> > there are 80,000 + warning messages saying the master has run a check
> > because it has become "stale".  On further investigation I find that on
> > all of our 5 slaves the command netstat shows that there are a large
> > number of TCP sockets in CLOSE_WAIT state (more .  My question is, has
> > anyone done any network tuning to improve Nagios network performance ?
> >
>
> Nope, but you could try doing
>
> 	sysconf net.ipv4.tcp_fin_timeout=30
>
> to halve the default tcp timeout in the kernel, which should reduce
> the number of half-open connections you have.
>
> --
> Andreas Ericsson                   andreas.ericsson at op5.se
> OP5 AB                             www.op5.se
> Tel: +46 8-230225                  Fax: +46 8-230231
>
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