About predefined and custom log file formats

Types of log file formats that are available

When you first install your NetCache appliance, the logs are generated in a default log format specific to each log. You can select other predefined formats or customize the log file format to meet your requirements. Most NetCache appliance log files adhere to the Extended Log File Format conventions described by the World Wide Web Consortium (www.w3.org). The Extended Log File Format enables you to add or delete log file headers so you can create customized log files that can be read by generic log analyzers.

In general, you can select two types of log file formats for your log files, predefined formats and custom formats.

Predefined formats
When you select a predefined format, you cannot alter the field set of the log (the list of log file headers) to change the information that is reported.

Because each log reports a specific type of information, the predefined formats differ from log to log. However, all of the log formats adhere to the Extended Log File Format conventions described by the World Wide Web Consortium.
Custom log format
When you select a custom format, you modify the field set of a predefined format or create a new format. Because the list of headers is specific to each log, some headers that can be used in the Web access log, for example, cannot be used in the other logs. When you generate the log file, the log headers appear in the order that you entered them.

Note
You cannot customize the Messages log, ContentDirector log, DNS, and FTP transfer access log.

Available log file formats

The formats available for each NetCache log file are shown in the following table.

Log	Formats available
CMS log	The CMS log cannot be customized. For more information, contact Network Appliance technical support.
ContentDirector log	The ContentDirector log cannot be customized. For more information, contact Network Appliance technical support.
FTP transfer access log	Default format only
GRM server access log	GRM Server Access Log Default Format Custom
GRM server details log	GRM Server Details Log Default Format Custom
ICAP 1.0 log	ICAP Default Log Format Custom
NNTP access log	NNTP Access Log Default Format Custom Format
Streaming access log	Streaming Access Log Default Format Custom
Streaming details log	Streaming Details Log Default Format Custom
Web access log Web server acceleration log	Web Access Log Default Format Common Log Format Netscape Extended Format Squid Native Format Custom Format

See the Guide to Messages and Log File Entries for details about the headers that are available in the various logs.