Managing Event Log Files; Choosing The Logging Directory; Controlling Logging Space - HP P4535A - Web Cache Server Appliance Administrator's Manual

Chapter 12
Traffic Server supports several standard log file formats, such as Squid and Netscape, and user-defined custom
formats. You can analyze the standard format log files with off-the-shelf analysis packages. To help with log
file analysis, you can separate log files so that they contain information specific to protocol or hosts. You can
also configure Traffic Server to roll log files automatically at specific intervals during the day.
The following sections describes the Traffic Server logging system features and discusses how to:
Manage your event log files
You can choose a central location for storing log files, set how much disk space to use for log files, and set
how and when to roll log files. See
Choose different event log file formats
You can choose which standard or custom log file formats you want to use for traffic analysis. See
Choosing event log file formats‚ on page
Rotate event log files automatically
You can configure Traffic Server to rotate event log files at specific intervals during the day so that you
can identify and manipulate log files that are no longer active. See
Separate log files according to protocols and hosts
You can configure Traffic Server to create separate log files for NNTP, ICP, and HTTP/FTP transactions.
You can also configure Traffic Server to generate separate log files for different protocols based on the
host. See Splitting event log files‚ on page
Collate log files from different Traffic Server nodes
You can designate one or more nodes on the network to serve as log collation servers. These servers, which
may either be stand-alone or part of Traffic Server, enable you to keep all logged information in well-
defined locations. See
View statistics about the logging system
Traffic Server provides statistics about the logging system. You can access the statistics through Traffic
Manager or through Traffic Line. See

Managing event log files

You can manage your event log files and control where they are located, how much space they can consume,
and how low disk space in the logging directory is handled.

Choosing the logging directory

By default, Traffic Server writes all event log files in the
directory where you installed Traffic Server. To use a different directory, see
<version>
management options‚ on page 100

Controlling logging space

Traffic Server allows you to control the amount of disk space that the logging directory can consume. This
allows the system to operate smoothly within a specified space window for a long period of time.
After you establish a space limit, Traffic Server continues to monitor the space in the logging directory. When
the free space dwindles to the headroom limit (see
a low space state and takes the following actions:
Managing event log files‚ on page
101.
112.
Collating event log files‚ on page
Viewing logging statistics‚ on page
below.
Setting log file management options‚ on page
99.
Rolling event log files‚ on page
115.
119.
directory, which is located in the
logs
Working with Log Files
109.
/home/TS4/
Setting log file
100), it enters
99