NRPE way too fragile ?

[Jayson Broughton]

Guillaume,

We actually have the same problem here where Nagios is setup.  I use the
NRPE daemon on both windows and linux servers.  Two of our servers do
backups early in the morning and during that time we get NRPE Timeout
messages from the two servers.  I have set the timeout on the server and the
clients to timeout after 30 seconds, thinking that would fix it.  But alas,
we still get timeout messages.  I haven't had much time to see what I can do
to fix this, so for now our solution is to not email out warning messages
from those two servers (I have the thresholds set enough where the critical
messages still gives enough window to take care of the problem before going
too critical)  I have come to the conclusion that the servers are running
the backup and eating up so much processing that the nrpe times out trying
to connect and send information.

If you find a solution or even an idea to try, feel free to let me know and
I'll give it a shot!

Jayson Broughton
Linux Systems Administrator
True Computer Operations Dept.
True Oil LLC


-----Original Message-----
From: Guillaume Rousse [mailto:Guillaume.Rousse at inria.fr] 
Sent: Wednesday, October 08, 2008 4:44 AM
To: nagios-users at lists.sourceforge.net
Subject: [Nagios-users] NRPE way too fragile ?

Hello list.

I'm using nrpe quite heavily for testing lots of local service on all my 
machines. It work usually well, but seems a bit unreliable: too much 
often, nrpe itself fails to accept incoming connections, and test fails:
CHECK_NRPE: Socket timeout after 10 seconds.

stracing nrpe process shows it is probably waiting itself on another 
connection:
[root at denfert ~]# strace -p 22444
Process 22444 attached - interrupt to quit
select(6, [5], NULL, [5], {0, 170000})  = 0 (Timeout)
accept(5, 0, NULL)                      = -1 EAGAIN (Resource 
temporarily unavailable)

It usually recovers itself alone, but that's enough to cause much 
unwanted notifications, even if all monitored services have nrpe itself 
as dependency. I'm using ssl encryption, as usually advised, but I'm 
planning shifting to plain-text connection (everything occurs on a 
distinc VLAN, without user access).

Does everyone else has similar experience ?
-- 
Guillaume Rousse
Moyens Informatiques - INRIA Futurs
Tel: 01 69 35 69 62

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