For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Internal Dummy Connections on Apache httpd
Is your Apache httpd log file 'full' of entries like this?
xx.xxx.xx.xx - - [02/Mar/2009:05:08:45 +0000] "OPTIONS * HTTP/1.0" 200 - "-" "Apache/2.2.9 (Unix) PHP/5.2.6 (internal dummy connection)"
What causes them?
Your web keeps a number of spare 'slots' open to process new incoming requests, opening them up ahead of growing traffic. And at times that traffic is dropping off, it closes spare slots to allow memory to be released to other system users. This dummy connection / request is used to signal to a slot that it should shut-down, so you'll find a series of these messages cropping up as traffic falls.
Should I worry about them?
Not very much. Some of them are to be expected; if there are a very large number of them, though, it may be worth you altering some of your server settings - see this previous article
for a description of how the slots are opened and closed.
Can I eliminate the from my logs?
Yes - add something like:
SetEnvIf Remote_Addr "xx\.xxx\.xx\.xx" dontlog
to your log file, and update your logging directive to use that setting:
CustomLog /var/log/apache2/access_log combined env=!dontlog
There's more detail of how this configuration change works at this off site resource
, but bear in mind that you'll be fixing a symptom rather than curing an issue if you simply stop logging huge quantities of these messages.
The IP address given will be your server's own IP address. If it's someone else's, then THAT would be a concern! (written 2009-03-02)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesA601 - Web Application Deployment - Apache httpd - an overview 
Why run two different web servers - (2006-01-25) 
Web Application Components - (2006-03-28) 
The LAMP Cookbook - Linux, Apache, MySQL, PHP / Perl - (2006-11-13) 
Apache, Tomcat, Jakarta, httpd, web server - what are they? - (2007-07-13) 
Keep the client experience easy - single server contact point - (2008-03-27) 
Keeping on an even keel - (2008-11-21) 
Apache httpd and Apache Tomcat miscellany - (2009-01-30) 
Sticky Sessions with mod_jk (httpd to Tomcat) - (2009-02-12) 
Tuning httpd / the supermarket checkout comparison - (2009-02-26) 
Why put Apache httpd in front of Apache Tomcat - (2009-03-12) 
An FAQ on the Apache httpd and Apache Tomcat web servers, and on using them together - (2009-05-17) 
Apache httpd - a robust, open source web server - (2013-04-16) 
Public training courses - upcoming dates - (2015-02-21)
Some other Articles
Perl - lists do so much more than arraysMelksham Industrial Static mirroring through HTTrack, wget and othersEast of Melksham CountrysideInternal Dummy Connections on Apache httpdVirtual hosting and mod_proxy forwarding of different domains (httpd)Tomcat 6 - Annotated Sample Configuration FilesDatabase connection Pooling, SSL, and command line deployment - httpd and TomcatSharing the load between servers - httpd and TomcatInvoker and cgi servlets on Tomcat 6
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This is a page archived from The Horse's Mouth at
the diary and writings of Graham Ellis.
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