[users@httpd] Passing variables to ErrorLog pipe

[Mike Cardwell <ap...@lists.grepular.com>]

Hi,

I'm using a pipe for my error log like this:

ErrorLog "|/web/etc/log_error_pipe.pl"

Is there any way of passing information to the pipe other than the log 
entry? Specifically I'd like to pass the HTTP_HOST value to it...

-- 
Mike Cardwell - IT Consultant and LAMP developer
Cardwell IT Ltd. (UK Reg'd Company #06920226) http://cardwellit.com/

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Re: [users@httpd] Passing variables to ErrorLog pipe

[Mike Cardwell <ap...@lists.grepular.com>]

Mike Cardwell wrote:

> I'm using a pipe for my error log like this:
> 
> ErrorLog "|/web/etc/log_error_pipe.pl"
> 
> Is there any way of passing information to the pipe other than the log 
> entry? Specifically I'd like to pass the HTTP_HOST value to it...

I came up with a pretty sick solution. I set the ErrorLog to log to 
syslog rather than a pipe.

Using syslog gives the error log one extra piece of useful information 
which is the pid of the apache child. It also contains the client IP and 
time.

So I set the CustomLog to log to a pipe, and updated the LogFormat to 
include the pid, start time and end time.

So if the error log entry has a time inbetween the start/end time of the 
access log entry, and it shares the same client ip and pid, then I can 
link it to a particular access log entry.

I have a script tailing the syslog file gathering error log information, 
and listening on a udp port for the CustomLog pipe process to send 
packets containing pid/ip/start_time/end_time/HTTP_HOST

-- 
Mike Cardwell - IT Consultant and LAMP developer
Cardwell IT Ltd. (UK Reg'd Company #06920226) http://cardwellit.com/

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