Jboss unreachable/ slow behind apache with ajp

Posted by Niels on Server Fault See other posts from Server Fault or by Niels
Published on 2012-10-08T13:06:29Z Indexed on 2012/10/08 15:40 UTC
Read the original article Hit count: 498

Filed under:

apache2

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tomcat

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reverse-proxy

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jboss

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mod-proxy-ajp

I have an linux server running with a JBoss Instance with apache2. Apache2 will use AJP connection to reverse proxy to JBoss.

I found these messages in the apache error.log:

[error] (70007)The timeout specified has expired: ajp_ilink_receive() can't receive header
[error] ajp_read_header: ajp_ilink_receive failed
[error] (120006)APR does not understand this error code: proxy: read response failed from 8.8.8.8:8009 (hostname)
[error] (111)Connection refused: proxy: AJP: attempt to connect to 8.8.8.8:8009 (hostname) failed
[error] ap_proxy_connect_backend disabling worker for (hostname)
[error] proxy: AJP: failed to make connection to backend: hostname
[error] proxy: AJP: disabled connection for (hostname)25

I googled around but I can't seem to find any related topics. There are people say this behavior can be caused by misconfigured apache vs jboss. Telling the max amount of connections apache allows are far greater then jboss, causing the apache connection to time out.

But I know the app isn't used by thousands of simultaneous connections at the time not even hundreds of connections so I don't believe this could be a cause.

Does anybody have an idea? Or could tell me how to debug this problem?

I'm using these versions:

Debian 4.3.5-4 64Bit
Apache Version 2.2.16
JBOSS Version 4.2.3.GA

Thanks

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