ssl - Apache Key: Which is it using?

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I'm running an Apache server on
Ubuntu. When I restart it, it asks me for a pass phrase; here's what the dialog looks
like:

Apache/2.2.16 mod_ssl/2.2.16 (Pass Phrase
Dialog)
Some of your private key files are encrypted for security
reasons.
In order to read them you have to provide the pass
phrases.

Server 127.0.0.1:443
(RSA)
Enter pass phrase:

I've already
worked out how to remove the pass phrase from the key file in question, but I can't find
any information anywhere on how to determine which key file Apache is complaining about
in the above dialog. I have dozens of key files on the server in question, although I
don't know which ones are in active use (all I did is 'locate .pem' and ignore the false
positives). Does anyone know how to track down which pem file I need to remove the
passphrase from?

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class="normal">Answer

If you
set up the server, you should know what keys are being used. Anyway, look out for
SSLCertificateKeyFile directives. If not contained in the
httpd.conf, they might hide in auxiliary files included with
the Include directive.