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POApache + Tomcat with mod_jk - Web site hangs
 

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  1. POApache + Tomcat with mod_jk - Web site hangs
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    <p>I have a website with apache 1.3(SSL enabled) + mod_jk + tomcat 5.5 on Linux redhad setup. Just recently i started having a downtime problem with my web site. Once a day, i get my web site hang on port 80. But if i access directly through 8080 tomcat responses and web site works fine. Both 80 and 8080 ports are accessible but apache and tomcat connection with mod_jk is broken. Only after i restart tomcat, the things get back to normal. </p> <p>I just configured apache mod_Jk to log the errors, so i will see if there will be any error on the next hang. </p> <p>apache mod_js conf:</p> <pre><code>JkShmSize 1000M </code></pre> <p>apache workers conf:</p> <pre><code>worker.list=worker1 worker.worker1.type=ajp13 worker.worker1.host=127.0.0.1 worker.worker1.port=8009 worker.worker1.lbfactor=1 worker.worker1.socket_keepalive=1 worker.worker1.recycle_timeout=180 worker.worker1.sticky_session=False </code></pre> <p>I checked web application error/warn logs on tomcat, i have some "out of memory" java exceptions. Can application errors cause this issue ? Can it be website overload problem or memory leak ? Currently <code>dev/mapper/VolGroup00-LogVol00</code> has only 4% free space. Can it be a cause for the problem ?</p> <p>I also got this log entry, it matchs the server hang time:</p> <blockquote> <p>/var/log/messages: possible SYN flooding on port 8009. Sending cookies</p> </blockquote> <p><strong>Update:</strong> I just got another down, the mod_jk log gives this:</p> <p><code> [Sun Nov 14 00:57:03 2010] [error] ajp_connection_tcp_get_message::jk_ajp_common.c (961): Can't receive the response message from tomcat, network problems or tomcat is$ [Sun Nov 14 00:57:03 2010] [error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet) [Sun Nov 14 00:57:08 2010] [error] ajp_connection_tcp_get_message::jk_ajp_common.c (961): Can't receive the response message from tomcat, network problems or tomcat is$ [Sun Nov 14 00:57:08 2010] [error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet) [Sun Nov 14 00:57:12 2010] [error] ajp_connection_tcp_get_message::jk_ajp_common.c (961): Can't receive the response message from tomcat, network problems or tomcat is$ [Sun Nov 14 00:57:12 2010] [error] ajp_get_reply::jk_ajp_common.c (1503): Tomcat is down or refused connection. No response has been sent to the client (yet) [Sun Nov 14 00:57:12 2010] [error] ajp_service::jk_ajp_common.c (1758): Error connecting to tomcat. Tomcat is probably not started or is listening on the wrong port. w$ [Sun Nov 14 00:57:12 2010] worker1 mydomain.com 50.999342 </code></p> <p>Looks my website is down on 8009 port. AJP 1.3 connector serves apache mod_jk on 8009 port.</p> <p>Any help or advice would be highly appreciated.</p> <p>Thanks.</p>
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    1. COIs your port 8009 open to the public?
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    2. COCan you advice how to check it ? i tried to access http://www.mydomain.com:8009. I am getting no http error but just a blank page. Does it mean 8009 is open for public and someone flooding or DDOS it ?
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