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I'd like to prepend the vhost name in my ErrorLog and then pipe it into a program I wrote.

Is it possible to write Custom Error log format as it is with Access log?

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Depending on your setup, you can have an ErrorLog for each of your virtual hosts. It's not the same as a unified parsable logfile, but it's something. –  muffinista May 6 '11 at 16:31

3 Answers 3

For piping see the ErrorLog directive and Piped Logs official manual entries which explain it pretty well.

Getting a custom error log format is more difficult. You can customize the access log easily with LogFormat but there is nothing built in for modifying the error log format. I did come across CGI::Carp which is a Perl module for outputting to the error log. Finally, there is always modifying the Apache source code directly depending on how badly you want this feature.

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In Apache 2.2 you cannot change the format of error_log easily - see http://httpd.apache.org/docs/2.2/logs.html#errorlog.

Apache 2.4 adds this support. See http://httpd.apache.org/docs/2.4/logs.html#errorlog.

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You are probably looking for mod_log_debug.

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While you are correct, it would be preferable to include the essential parts of the answer at the link here, in case the link goes dead or is moved. –  HopelessN00b Oct 8 '12 at 1:13

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