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From: | Will Bryant |
Subject: | Re: TCP error |
Date: | Sat, 18 Nov 2006 11:41:17 +1300 |
I have monit setup to check on our Apache (v 2.2.3) and a couple of other
resources with 2min cycles. The problem is that monit reports strange HTTP
error very frequently (avery hour or so) although the apache seems to be
very healthy as I can see from apache logs -- basically there's no
interruption of traffic to the outside world. Then after a couple of
minutes, things seem to fix on their own (ie. monit doesnt report an error).
Here's my monit error:
>>'apache' failed, cannot open a connection to INET[www.ipetitions.com:80]
>>via TCP
and the entry in monitrc to check on apache is as follows (running on
myserver.com machine):
>>
if failed host www.myserver.com port 80 protocol http
and request "/monit_token"
with timeout 30 seconds
for 3 times within 5 cycles
then restart
>>
So it is NOT http protocol that fails... monit simply fails to open a TCP
port I guess. When there's a success, the following two lines are in the
log:
>>'apache' succeeded connecting to INET[www.myserver.com:80] via TCP
>>'apache' succeeded testing protocol [HTTP] at INET[ www.myserver.com:80]
>>via TCP
Does anyone have a clue what might be the problem here? Maybe something to
do with TCP stack and not monit itself? I'm running this on
RHEL4/Centos4_x64 system. We get decent traffic (5k hits daily), but nothing
too bad and average cpu loads on the server are about 0.1 or so...
-mike
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