Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manuale Utente Scaricare il pdf (Pagina 59)

Chapter 7. Logging

• There is no record of whether chalk.dept.cam.ac.uk or cheese.dept.cam.ac.uk was

queried.

• The hostnames are addresses, not names

The simplest way to address the issue of which website was queried is to move the

CustomLog lines into the virtual host sections and to have two different log ﬁles.

This gives them the ﬂexibility to log different things too.

If we really wanted a single log ﬁle with the virtual host information we could use

the %v escape code to record it.

ServerName cheese.dept.cam.ac.uk

DocumentRoot /var/www/CHEESE

CustomLog logs/cheese.log "%t %U %h %s"

</VirtualHost>

Figure 7-8. Setting a log ﬁle for cheese.dept.cam.ac.uk

To enable the use of hostnames rather than addresses, we must instruct the web

server to do DNS lookups for the IP addresses on each incoming query. We will do

this with the HostnameLookups command. This command is a core Apache com-

mand and not part of the logging module. It is also required if you plan to do any

access controls based on host names as we will be in the Section called Access control

by client IP address in Chapter 10. We will set this on globally. If either website wanted

to record IP addresses rather than hostnames then it can do so by using %s rather

than %h.

HostnameLookups On

Figure 7-9. Turning on hostname lookups

[26/Mar/2003:14:09:54 +0000] / noether.csi.cam.ac.uk 200

[26/Mar/2003:14:09:54 +0000] /icons/dir.gif noether.csi.cam.ac.uk 304

[26/Mar/2003:14:09:55 +0000] /icons/layout.gif noether.csi.cam.ac.uk 304

[26/Mar/2003:14:09:57 +0000] /alpha.html noether.csi.cam.ac.uk 200

[26/Mar/2003:14:10:00 +0000] /beta.html noether.csi.cam.ac.uk 200

Figure 7-10. The cheese.dept.cam.ac.uk log ﬁle

Common Log Format

A standard format for access log ﬁles is used by many utilities and replied on by the

web analysis programs. It is called “The Common Log Format” (CLF) and is shown

below.

CustomLog logs/chalk_log "%h %l %u %t \"%r\" %>s %b"

Figure 7-11. httpd.conf: Specifying the Common Log Format for

chalk.dept.cam.ac.uk

noether.csi.cam.ac.uk - - [26/Mar/2003:14:25:49 +0000]

"GET /index.html HTTP/1.1" 304 0

noether.csi.cam.ac.uk - - [26/Mar/2003:14:26:00 +0000]

"GET /nonesuch.html HTTP/1.1" 404 211

Figure 7-12. The Common Log Format for chalk.dept.cam.ac.uk

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 95 96

Nessun commento

Red Hat DIRECTORY SERVER 2.0 - GATEWAY Manuale Utente Pagina 59