Supporting access_log to a pipe?

Igor Sysoev is at
Wed Jun 17 21:27:55 MSD 2009

On Wed, Jun 17, 2009 at 11:53:27AM -0400, wesleywu wrote:

> I need to monitor access log in a separated application, to identify frequent visits like DoS attack.
> Now I'm using apache httpd. CustomLog directive of httpd (equivalent to access_log directive in Ngnix) supports write log lines to the stdin of a piped application.
> Quote from
> Syntax:	CustomLog file|pipe format|nickname environment-variable]
> pipe
> The pipe character "|", followed by the path to a program to receive the log information on its standard input.
> Will Ngnix support this feature? Or is there any solution to monitor every log line of access_log?

No, nginx will not support logging to a pipe since this is simlpy waste of CPU.
You may try
tail -F /path/to/log | app
This is almost the same waste of CPU as piped log.

Igor Sysoev

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