Is it possible to create Custom Error Log in Apache 2?

Question

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?

Answer 1

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.