Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manual de usuario descargar pdf (Pagina 55)

Chapter 7. Logging

Error log

We will examine the error log to see what is logged and to change the amount of

logging done.

log_conﬁg_module

We will load and use a module that allows us to conﬁgure exactly what we log for

each request.

Log ﬁle rotation

We will illustrate the Red Hat Linux system-wide mechanism for log rotation and

brieﬂy mention, and then discard, an Apache-speciﬁc way to do the same thing.

Log ﬁle analysis

We will illustrate the use of the webalizer package for processing the log ﬁles to pro-

vide a set of web pages illustrating the use of the server.

Legalities

There will be a brief description of the legal implications of keeping log ﬁles. The

author is not a lawyer and everything will change as either Parliament implements

yet another piece of contradictory legislation or a senile fool of a high court judge

farts while setting precedent.

The error log

The log ﬁle /var/log/httpd/error_log contains the error reports and warnings

from the web server. By default, the directory /var/log/httpd is readable only by

root. You may want to change this on your system. Within the directory, the ﬁles are

created world-readable. Only the directory’s permissions need be changed.

Let’s consider a number of the typical entries in the error log as it currently stands.

[Mon Mar 24 10:23:11 2003] [notice] SIGHUP received. Attempting to restart

[Mon Mar 24 10:23:11 2003] [notice] Apache/2.0.40 (Red Hat Linux) configured

-- resuming normal operations

Figure 7-1. error_log: Reloads

Our ﬁrst example will be seen in the log ﬁles from this course more than any other

lines (we hope!). The line that starts “SIGHUP received” is the logged entry that

means we requested a reload of the conﬁguration ﬁle. A SIGHUP is an operating sys-

tem signal sent to a running process (the web server) instructing it to do something.

In our case it is to reread the conﬁguration ﬁle.

The line that (hopefully) follows it is the line from Apache that says it has been

(re)conﬁgured and that it is “resuming normal operations”, i.e. serving web pages

again.

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Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manual de usuario Pagina 55