Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

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.)

share|improve this question

1 Answer 1

up vote 1 down vote accepted

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
share|improve this answer
    
OK, thank you. What this means I hope is that all forked processes would dup() the pipe? Curious how it synchronizes record output. Where I'm going with that: is there a performance hit with a lot of CustomLog's? –  Xepoch Apr 29 '10 at 17:48

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.