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From: =?UTF-8?Q?Andr=c3=a9_Warnier_=28tomcat=29?= <aw@ice-sa.com>
Subject: Re: Connectivity Issue with Tomcat7 and WebServer (AJP Connector)
To: users@tomcat.apache.org
References: <CAEt=kQhBCxx7k1e737Uv-dhhYwk70M9VHSuUe_q_9y4icJErig@mail.gmail.com>
Message-ID: <57A7ADBC.2030006@ice-sa.com>
Date: Sun, 7 Aug 2016 23:53:00 +0200
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archived-at: Sun, 07 Aug 2016 21:53:07 -0000

On 07.08.2016 11:08, Jayaram Ponnusamy wrote:
> Hi,
> We are using Tomcat 7.0.42.0, AJP/1.3 with Apache 2.2.21.
> Connecting Apache to Tomcat as VirtualHost, The Problem is Apache and
> Tomcat losing its connection every 20-30 Minutes. Either We have to hit the
> WebServer URL multiple times or Reboot Apache & Tomcat to resolve the issue
> for short-time.
> Also accessing WebServer URL is very very slow than tomcat URL (Mostly it
> takes 30-45seconds to load a Page).
>
> I have added tomcat/Apache configurations below, Kindly please help me to
> resolve this issue.
>
>
> Tomcat (Server.xml):
> <Connector port="9090"
protocol="HTTP/1.1"
>   connectionTimeout="600000"
>   redirectPort="8443"
>   URIEncoding="UTF-8" emptySessionPath="true"/>

> <Connector port="9009" protocol="AJP/1.3" redirectPort="8443"
> URIEncoding="UTF-8" connectionTimeout="600000"/>  <------ (*)
>
> Apache (Workers.properties):
> worker.list=prod_live_svr
> worker.prod_live_svr.type=ajp13
>
> worker.prod_live_svr.host=10.100.0.31
> worker.prod_live_svr.port=9009
> worker.prod_live_svr.lbfactor=50
> worker.prod_live_svr.socket_keepalive=1
>
> worker.prod_live_svr.connection_pool_size=100
> worker.prod_live_svr.connection_pool_minsize=50
> worker.prod_live_svr.connection_pool_timeout=500
>
>
> VirtualHost.conf:
> <VirtualHost *:80>
>
> ServerName 10.100.0.31
>
>
> ErrorLog logs/live/http_error.log
> RewriteLog logs/live/http_rewrite.log
>
> RewriteEngine on
> RewriteCond %{REMOTE_ADDR} !^10\.100\.0\.31$
> RewriteRule ^/+$ /sites/  [R,L]
>
> <IfModule rewrite_module>
> Options +FollowSymlinks
> RewriteEngine On
>
> RewriteOptions Inherit
> RewriteLog logs/rewrite.log
>
> </IfModule>
> JkMount   /*        prod_live_svr
>
> JkOptions +ForwardURICompatUnparsed
>
> </VirtualHost>
>
>

1) Question : are Apache httpd and Tomcat on the same machine ?

And if yes, why do you not set

> worker.prod_live_svr.host=127.0.0.1

2) why : connectionTimeout="600000"  (*)
That is 5 minutes.
By default, "keepAliveTimeout" is also that same value.
It means that after a request is processed (and finished) on one instance of a Connector, 
this Connector will remain "stuck" on the same connection for another 5 minutes, before it 
gives up and closes it.  That is kind of wasteful.

3) Why this : worker.prod_live_svr.socket_keepalive=1
Do you have a firewall between Apache httpd and Tomcat ?

4) Why these ?
> worker.prod_live_svr.connection_pool_size=100
> worker.prod_live_svr.connection_pool_minsize=50
> worker.prod_live_svr.connection_pool_timeout=500

See : http://tomcat.apache.org/connectors-doc/reference/workers.html
--> connection_pool_size
--> connection_pool_minsize
--> connection_pool_timeout  (see also (*) above)

In general (and particularly since you do not seem to be an expert in this kind of 
configuration), you should not set parameters when you do not understand exactly what they 
are doing.
The default configurations of Apache httpd, Tomcat and AJP are set by experts (who know 
what they are doing), to values which fit a wide range of realistic use cases.

I would suggest to rewrite your configuration as follows :

I) Tomcat server.xml :

<Connector port="9009" protocol="AJP/1.3" redirectPort="8443"
  URIEncoding="UTF-8">

II) Apache httpd, workers.properties :

worker.list=prod_live_svr

worker.prod_live_svr.type=ajp13
worker.prod_live_svr.host=127.0.0.1
worker.prod_live_svr.port=9009

-----------------

That's it, no other parameters.

The Apache-side mod_jk connector module will by default and reasonably set the connection 
pool size, keepalive and timeout values etc.


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