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Apache maintains logs of all requests by users to your Web site. By default, these logs include records using the Common Log Format (CLF). The record for each request takes up a line composed of several fields: host, identity check, authenticated user (for logins), the date, the request line submitted by the client, the status sent to the client, and the size of the object sent in bytes. Using the LogFormat and CustomLog directives, you can customize your log record to add more fields with varying levels of detail. These directives use a format string consisting of field specifiers to determine the fields to record in a log record. You add whatever fields you want, and in any order. A field specifier consists of a percent (%) symbol followed by an identifying character. For example, %h is the field specifier for a remote host, %b for the size in bytes, and %s for the status. See the documentation for the mod_log_config module for a complete listing. Table 24-3 lists several of the commonly used ones. You should quote fields whose contents may take up more than one word. The quotes themselves must be quoted with a backslash to be included in the format string. The following example is the Common Log Format implemented as a FormatLog directive:
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FormatLog "%h %l %u %t \"%r\" %s %b"
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Instead of maintaining one large log file, you can create several log files using the CustomLog or TransferLog directive. This is helpful for virtual hosts where you may want
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to maintain a separate log file for each host. You use the FormatLog directive to define a default format for log records. TransferLog then uses this default as its format when creating a new log file. CustomLog combines both operations, enabling you to create a new file and to define a format for it.
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FormatLog "%h %l %u %t \"%r\" %s %b" # Create a new log file called myprojlog using the FormatLog format TransferLog myprojlog # Create a new log file called mypicslog using its own format CustomLog mypicslog "%h %l %u %t \"%r\" %s %b"
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Certain field specifiers in the log format can be qualified to record specific information. The %i specifier records header lines in requests the server receives. The reference for the specific header line to record is placed within braces between the % and the field specifier. For example, User-agent is the header line that indicates the browser software used in the request. To record User-agent header information, use the conversion specifier %{User-agent}i. To maintain compatibility with NCSA servers, Apache originally implemented AgentLog and RefererLog directives to record User-agent and Referer headers. These have since been replaced by qualified %i field specifiers used for the LogFormat and CustomLog directives. A Referer header records link information from clients, detecting who may have links to your site. The following is an NCSA-compliant log format:
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"%h %l %u %t \"%r\" %s %b\"%{Referer}i\" \"%{User-agent}i\"".
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Apache provides two utilities for processing and managing log files. logresolve resolves IP addresses in your log file to host names. rotatelogs rotates log files without having to kill the server. You can specify the rotation time.
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Virtual hosting allows the Apache Web server to host multiple Web sites as part of its own. In effect, the server can act as several servers, each hosted Web site appearing separate to outside users. Apache supports both IP address and name-based virtual hosting. IP address virtual hosts use valid registered IP addresses, whereas name-based virtual hosts use fully qualified domain addresses. These domain addresses are provided by the host header from the requesting browser. The server can then determine the correct virtual host to use on the basis of the domain name alone. Note that SSL servers require IP virtual hosting. See httpd.apache.org for more information.
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