Red Hat DIRECTORY SERVER 2.0 - GATEWAY Bedienungsanleitung PDF herunterladen (Seite 58)

Chapter 7. Logging

This provides us with one particularly useful command: CustomLog. This allows us

to specify what information to record and where to record it for each query/response

at the server. This power comes at the price of almost complete syntactic obscurity at

ﬁrst glance. But in all honesty it’s not that bad.

Suppose we wanted to record just the following information about each query pro-

cessed by the server:

• Time & date

• URL requested

• Name of system making the request

• Whether the request was successful

LoadModule log_config_module modules/mod_log_config.so

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

Figure 7-6. httpd.conf: Basic logging of requests

Each of the elements beginning with a percentage character is called an escape code

and is converted into some piece of logged information. A complete list of the codes

is given in Appendix B.

Four escape sequences

The time of the request

The URL requested

The client hostname

Status code of the request

To illustrate what they indicate and what they don’t, we will request three URLs and

note a number of problems in the logged output.

The requested URLs

• http://cheese.dept.cam.ac.uk/

• http://chalk.dept.cam.ac.uk/

• http://cheese.dept.cam.ac.uk/gamma.html

[08/May/2003:10:26:02 +0100] / 131.111.11.148 200

[08/May/2003:10:26:10 +0100] /index.html 131.111.11.148 200

[08/May/2003:10:26:29 +0100] /gamma.html 131.111.11.148 200

Figure 7-7. request.log: The corresponding output

Problems with the output as it stands

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 95 96

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Red Hat DIRECTORY SERVER 2.0 - GATEWAY Bedienungsanleitung Seite 58