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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: suddenly created many connections
Date Wed, 06 Mar 2013 05:23:43 GMT
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Dhaval,

On 3/5/13 10:41 AM, Dhaval Jaiswal wrote:
> I have seen suddenly so many established connections like below on
> my system.
> 
> There is http & tomcat both are running on the same machine.
> 
> Previously it was not there. only last 3 days i am observing it.
> moreover since then i have installed nagios on the same server to
> measure the activity of the server.
> 
> tcp        0      0 ::ffff:192.168.4.5:8009
> ::ffff:192.168.4.5:36290 ESTABLISHED - tcp        0      0
> ::ffff:192.168.4.5:8009     ::ffff:192.168.4.5:41666 ESTABLISHED - 
> tcp        0      0 ::ffff:192.168.4.5:8009
> ::ffff:192.168.4.5:52930 ESTABLISHED -
> 
> Can some one explain me.

Looks like you have Tomcat listening on a private interface to port
8009 (which is the default AJP/1.3 port) and another process on the
local machine is connected to it (most likely Apache httpd).

Did you know that AJP connections are intended to be (and, in a
default configuration, are) persistent? That means that if you forward
10 connections from httpd -> Tomcat, you will likely have 10
connections maintained between httpd -> Tomcat for a while -- a few
minutes probably.

All of this you can configure: just read the documentation for mod_jk
and the AJP connectors (remember: there are 3 of them: BIO, NIO, and APR).

> Yes, i have observed this behavior after installing nagios.

Did you notice different behavior before? Or are you only now noticing
that AJP connections are long-lived?

- -chris
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