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Asked: 2010-04-30 08:31:26 +0800 CST

Does Apache spawn piped logger on each HTTP request?

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I am examining a high-volume Apache prefork site and noticing that many log entries such as:

CustomLog '|/foo/bar/cronolog -foo -bar'
RewriteLog '|/foo/bar/cronolog -bar -foo'

When apache logs the request or the rewrite is cronolog spawned for EACH request or is the pipe opened and written-to for the lifetime duration of the preforked apache process?

(This was asked on stackoverflow but I'll remove from there as more applicable here I think.)

apache-2.2 pipe cronolog prefork

1 Answers

  1. Best Answer

    It is spawned once per CustomLog directive.

    So on my server where I use these two directives in the global scope only one copy of cronolog started and used for writing logs.

    LogFormat "%v:%p %h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combinedvhost
CustomLog "|/usr/bin/cronolog /var/log/apache2/%Y%m.combined.allhosts.log" combinedvhost
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