Apache process ID

Sometimes you need to know the Apache PID when trying to track down segfaults or CPU usage issues.

There is a very simple way to do this by altering your LogFormat, a command format to have is the CLF (common log format):

%h %l %u %t \"%r\" %>s %b

To enable logging the pid just add the %P var like so:

[%P] %h %l %u %t \"%r\" %>s %b